subject:(Blast loading)

University of Cape Town

1. Shangase, Thobani Paul. Changes in material characteristics of AISI 430 stainless steel plates subjected to repeated blast loading.

Degree: Image, Blast Impact and Survivability Research Unit, 2017, University of Cape Town

URL: http://hdl.handle.net/11427/27391

► Structures deform at high strain rates and temperatures when exposed to impulsive loads. To accommodate the macro change there are microstructural changes that occur, i.e.,… (more)

▼ Structures deform at high strain rates and temperatures when exposed to impulsive loads. To accommodate the macro change there are microstructural changes that occur, i.e., grain morphology and shear banding. Most studies report on macroscopic response, i.e., large inelastic deformation and tearing of the structure, while limited studies have reported on microscopic changes that develop in the structure. The microstructure is directly related to the mechanical properties and performance of the material. Therefore, understanding the effect of high strain rate loadings on the microstructural evolution and subsequent mechanical properties of metals and alloys is necessary for mechanical design. The main objective of this research was to investigate microstructural changes to characterise the strain distribution and plastic deformation, owing to impulsive loading. Features within the microstructure that could be used to characterise deformation included grain size morphology changes, the presence of shear bands and sub-grain networks. The electron backscatter diffraction (EBSD) technique, which used Kikuchi patterns to characterise the strain distribution in the crystal of the deformed material, was also used as a characterisation tool. The first step in the experimental procedure was to select the appropriate material to investigate these microstructural changes. There was also the systematic investigation into the use of single and double heat treatments. These were used to achieve a large equiaxed grain structure, which was desirable from a microstructural point of view but was not desirable for blast-resistant material selection. The two-step heat treatment was concluded to be the most suitable heat treatment for the annealing and homogenisation of the AISI 430 stainless steel plates. The AISI 430 stainless steel plates used were 244 mm by 244 mm in size and had a circular exposed area of 106 mm. These plates were subjected to repeated explosive blasts, using a plastic explosive (PE4). The charge mass was varied for each test and the stand-off distance was kept constant at 150 mm for uniform loads and 13 mm for localised loads. Two plates were selected to investigate the uniform loading scenario. The first plate, a torn plate, used a charge mass of 30 g and one blast and the second plate, an inelastically-deformed plate, used a charge mass of 10 g and was exposed to three blasts. These two plates offered the same overall charge load with a different strain path. A further two plates were chosen for the investigation into the localised loading scenario. One plate, a petalled plate, used a 6 g charge mass and was exposed to two blasts and the second plate, an inelastically-deformed plate, used a 5 g charge mass and was also exposed to two blasts. The latter two plates offered an investigation into the effect of an increased charge load, where charge load affected the strain rate of the deformation resulting from the blast load. All four plates were sectioned across the midline of the dome and then ground and polished… Advisors/Committee Members: Yuen, Steeve Chung Kim (advisor), George, Sarah L (advisor).

Subjects/Keywords: Blast Impact; Blast loading

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APA (6^th Edition):

Shangase, T. P. (2017). Changes in material characteristics of AISI 430 stainless steel plates subjected to repeated blast loading. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/27391

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shangase, Thobani Paul. “Changes in material characteristics of AISI 430 stainless steel plates subjected to repeated blast loading.” 2017. Thesis, University of Cape Town. Accessed April 11, 2021. http://hdl.handle.net/11427/27391.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shangase, Thobani Paul. “Changes in material characteristics of AISI 430 stainless steel plates subjected to repeated blast loading.” 2017. Web. 11 Apr 2021.

Vancouver:

Shangase TP. Changes in material characteristics of AISI 430 stainless steel plates subjected to repeated blast loading. [Internet] [Thesis]. University of Cape Town; 2017. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/11427/27391.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shangase TP. Changes in material characteristics of AISI 430 stainless steel plates subjected to repeated blast loading. [Thesis]. University of Cape Town; 2017. Available from: http://hdl.handle.net/11427/27391

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Curry, Richard. Response of plates subjected to air-blast and buried explosions.

Degree: Image, Blast Impact and Survivability Research Unit, 2017, University of Cape Town

URL: http://hdl.handle.net/11427/26877

► Explosive threats have become more prevalent in both military and terrorist theatres of conflict, showing up largely in the form of Improvised Explosive Devices (IED)… (more)

▼ Explosive threats have become more prevalent in both military and terrorist theatres of conflict, showing up largely in the form of Improvised Explosive Devices (IED) which are often buried in soil to conceal them and increase their effectiveness. The response of a structure subjected to a blast load is influenced by many factors, namely stand off distance, mass of explosive, degrees of confinement and medium surrounding the charge. This study focuses on characterizing the transient deformation of test plates which have been exposed to different explosive loading conditions including free air blasts (AIR), backed charge (VBP) and buried charge (SBP) configurations. In the three loading configurations, four charge masses are considered, utilizing 10g, 15g, 20g and 25g masses of PE4 plastic explosive which were moulded into cylindrical charges of a constant 38mm diameter. The transient deformation of the test plates was captured using high speed Digital Image Correlation (DIC), which utilized two high speed cameras to record the experiments. Extensive modifications to the blast pendulum to incorporate the cameras was necessary to adapt this technique in a different method to that used in previous literature. The mounting method proposed allowed the cameras to record the experiment while capturing the impulse imparted on a test plate using a blast pendulum. The experimental plates exhibited only Mode I failure, which is plastic deformation, enabling the effect of different loading configurations on the transient and final plate deformation profiles to be identified. Numerical simulations of the experiments were developed to further the understanding of the load arising from the three configurations and the deformation mechanisms involved. The experimental results are used to validate the numerical models, which allow for a better understanding of the evolution of the deformation and strains across the plate. The transient data for the numerical simulation and the experiments were found to match closely. This work clearly shows the effect that the different loading conditions have on the tests plates, specifically the impulse distributions and transient strain in the plates. It was observed in this study that the impulse imparted on a test plate increases with the addition of sand while keeping other test conditions constant. The impulse recorded was observed to increase by 490-540% and 19-100% when compared to AIR and VBP 50mm SOD tests respectively. The loading profile acting on the test plate as a result of the specific impulse changes significantly with the inclusion of sand. The midpoint deflection increases with a decrease in stand off distance, increase in charge mass, increase in level of confinement or the inclusion of an overburden of sand. The observed increase in midpoint deflection of between 90-160% and 30-40% when compared to AIR and VBP 50mm SOD tests respectively was reported. The transient plate profile does not match the final deformation profile. Advisors/Committee Members: Langdon, Genevieve (advisor).

Subjects/Keywords: Blast Impact; Blast loading

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APA (6^th Edition):

Curry, R. (2017). Response of plates subjected to air-blast and buried explosions. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/26877

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Curry, Richard. “Response of plates subjected to air-blast and buried explosions.” 2017. Thesis, University of Cape Town. Accessed April 11, 2021. http://hdl.handle.net/11427/26877.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Curry, Richard. “Response of plates subjected to air-blast and buried explosions.” 2017. Web. 11 Apr 2021.

Vancouver:

Curry R. Response of plates subjected to air-blast and buried explosions. [Internet] [Thesis]. University of Cape Town; 2017. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/11427/26877.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Curry R. Response of plates subjected to air-blast and buried explosions. [Thesis]. University of Cape Town; 2017. Available from: http://hdl.handle.net/11427/26877

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

3. Nezilli, Soufiane. RESPONSES OF UNDERGROUND STRUCTURES SUBJECTED TO BLAST LOADING.

Degree: Master of Engineering (M.E.), Civil Engineering, 2014, City University of New York

URL: https://academicworks.cuny.edu/cc_etds_theses/646

► Terrorism against American citizens and assets is real and growing. The number and intensity of domestic and international terrorist events, along with the September… (more)

Subjects/Keywords: blast; loading; tunnels; Civil Engineering

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APA (6^th Edition):

Nezilli, S. (2014). RESPONSES OF UNDERGROUND STRUCTURES SUBJECTED TO BLAST LOADING. (Thesis). City University of New York. Retrieved from https://academicworks.cuny.edu/cc_etds_theses/646

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nezilli, Soufiane. “RESPONSES OF UNDERGROUND STRUCTURES SUBJECTED TO BLAST LOADING.” 2014. Thesis, City University of New York. Accessed April 11, 2021. https://academicworks.cuny.edu/cc_etds_theses/646.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nezilli, Soufiane. “RESPONSES OF UNDERGROUND STRUCTURES SUBJECTED TO BLAST LOADING.” 2014. Web. 11 Apr 2021.

Vancouver:

Nezilli S. RESPONSES OF UNDERGROUND STRUCTURES SUBJECTED TO BLAST LOADING. [Internet] [Thesis]. City University of New York; 2014. [cited 2021 Apr 11]. Available from: https://academicworks.cuny.edu/cc_etds_theses/646.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nezilli S. RESPONSES OF UNDERGROUND STRUCTURES SUBJECTED TO BLAST LOADING. [Thesis]. City University of New York; 2014. Available from: https://academicworks.cuny.edu/cc_etds_theses/646

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

4. Karapanou, A. (author). Spider web design: “Research and development on the application of spider silk and web typology in the building industry”.

Degree: 2014, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:211ee221-a80c-444a-b448-5d62c5f6f987

►

In today’s world, terrorism is an unfortunate reality. Since 9-11, blast design has become a well-sought after design not only for federal and military buildings… (more)

Subjects/Keywords: spider web; cable net facade; blast loading

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APA (6^th Edition):

Karapanou, A. (. (2014). Spider web design: “Research and development on the application of spider silk and web typology in the building industry”. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:211ee221-a80c-444a-b448-5d62c5f6f987

Chicago Manual of Style (16^th Edition):

Karapanou, A (author). “Spider web design: “Research and development on the application of spider silk and web typology in the building industry”.” 2014. Masters Thesis, Delft University of Technology. Accessed April 11, 2021. http://resolver.tudelft.nl/uuid:211ee221-a80c-444a-b448-5d62c5f6f987.

MLA Handbook (7^th Edition):

Karapanou, A (author). “Spider web design: “Research and development on the application of spider silk and web typology in the building industry”.” 2014. Web. 11 Apr 2021.

Vancouver:

Karapanou A(. Spider web design: “Research and development on the application of spider silk and web typology in the building industry”. [Internet] [Masters thesis]. Delft University of Technology; 2014. [cited 2021 Apr 11]. Available from: http://resolver.tudelft.nl/uuid:211ee221-a80c-444a-b448-5d62c5f6f987.

Council of Science Editors:

Karapanou A(. Spider web design: “Research and development on the application of spider silk and web typology in the building industry”. [Masters Thesis]. Delft University of Technology; 2014. Available from: http://resolver.tudelft.nl/uuid:211ee221-a80c-444a-b448-5d62c5f6f987

University of Illinois – Urbana-Champaign

5. Singh, Karandeep. Probabilistic models for blast parameters and fragility estimates of steel columns subject to blast loads.

Degree: MS, Civil Engineering, 2018, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/102960

► This thesis proposes a probabilistic framework to predict the failure probabilities of steel columns subject to blast loads. The framework considers the uncertainties in the… (more)

Subjects/Keywords: Blast loading; Fragility estimates; Probabilistic blast models; Steel column; SDOF analysis

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APA (6^th Edition):

Singh, K. (2018). Probabilistic models for blast parameters and fragility estimates of steel columns subject to blast loads. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/102960

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Singh, Karandeep. “Probabilistic models for blast parameters and fragility estimates of steel columns subject to blast loads.” 2018. Thesis, University of Illinois – Urbana-Champaign. Accessed April 11, 2021. http://hdl.handle.net/2142/102960.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Singh, Karandeep. “Probabilistic models for blast parameters and fragility estimates of steel columns subject to blast loads.” 2018. Web. 11 Apr 2021.

Vancouver:

Singh K. Probabilistic models for blast parameters and fragility estimates of steel columns subject to blast loads. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2018. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2142/102960.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Singh K. Probabilistic models for blast parameters and fragility estimates of steel columns subject to blast loads. [Thesis]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/102960

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

6. Ghoor, Ismail B. The response of concave singly curved fibre reinforced moulded sandwich and laminated composite panels to blast loading.

Degree: Image, Blast Impact and Survivability Research Unit, 2018, University of Cape Town

URL: http://hdl.handle.net/11427/27811

► Composite materials are increasingly being used in a wide range of structural applications. These applications range from bicycle frames and building facades to hulls of… (more)

▼ Composite materials are increasingly being used in a wide range of structural applications. These applications range from bicycle frames and building facades to hulls of marine ships. Their popularity is due to the high specific strength and stiffness properties, corrosion resistance, and the ability to tailor their properties to a required application. With the increasing use of composites, there is a need to better understand the material and damage behaviour of these structures. In recent years, the increased frequency of wars and terror attacks have prompted investigations into composite failure processes resulting from air-blast. Most of the research has been focused on flat panels, whereas there is relatively little on curved structures. This dissertation reports on the effect of air-blast loading on concave, singly curved fibre reinforced sandwich and composite panels. Sandwich panels and equivalent mass glass fibre laminates were manufactured and tested. Three types of curvature namely a flat panel (with infinite curvature), a curvature of 1000 mm radius and a curvature of 500 mm radius were produced, to determine the influence of curvature on panel response. The laminates were made from 16 layers of 400 g/m² plain weave glass fibre infused with Prime 20 LV epoxy resin. The sandwich panels consisted of a 15 mm thick Airex C70:75 core sandwiched between the 12 layers of 400 g/m² plain weave glass fibre and infused with Prime 20 LV epoxy resin. This arrangement produced a balanced sandwich panel with 6 layers of glass fibre on the front and back respectively. For all panels, vacuum infusion was used to manufacture in a single shot process. Mechanical properties of samples were tested for consistency in manufacturing. It was found that mechanical properties of the samples tested were consistent with low standard deviations on tensile and flexural strength. The panels were tested in the blast chamber flat the University of Cape Town. Blast specimens were clamped onto a pendulum to facilitate impulse measurement. Discs of plastic explosive, with charge masses ranging from 10 g to 25 g, were detonated. After blast testing, a post-mortem analysis of the damaged panels was conducted. Post-mortem analysis revealed that the failure progression was the same irrespective of curvature for both the sandwich panels and the laminates. Sandwich panels exhibited the following failure progression: delamination, matrix failure, core crushing, core shear, core fragmentation, core penetration and fibre fracture. The laminates displayed the following progression: delamination, matrix failure and fibre fracture. Curved panels exhibited failure initiation at lower charge masses than the flat panels. As the curvature increased, the failure modes initiated at lower charge masses. For example, as the charge mass was increased to 12.5 g the front face sheets of the flat and the 1000 mm radius sandwich panels exhibited fibre fracture, but the 500 mm radius sandwich panel exhibited fibre fracture and rupture through the thickness of the… Advisors/Committee Members: Von Klemperer, Christopher J (advisor), Langdon, Genevieve (advisor).

Subjects/Keywords: Blast Impact; Blast loading

…shock blast loading with shock pressures overlaid on the images [4] . . . . . . 19… …24 2.17 Localised blast loading experimental arrangement of Langdon et al [22]… …response to blast loading. This endeavour makes the understanding of blast response not only… …blast loading. Chapter 1: Introduction 2 University of Cape Town 1.2 Department of… …response of singly concave curved composite panels to blast loading. The objectives of the…

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APA (6^th Edition):

Ghoor, I. B. (2018). The response of concave singly curved fibre reinforced moulded sandwich and laminated composite panels to blast loading. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/27811

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ghoor, Ismail B. “The response of concave singly curved fibre reinforced moulded sandwich and laminated composite panels to blast loading.” 2018. Thesis, University of Cape Town. Accessed April 11, 2021. http://hdl.handle.net/11427/27811.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ghoor, Ismail B. “The response of concave singly curved fibre reinforced moulded sandwich and laminated composite panels to blast loading.” 2018. Web. 11 Apr 2021.

Vancouver:

Ghoor IB. The response of concave singly curved fibre reinforced moulded sandwich and laminated composite panels to blast loading. [Internet] [Thesis]. University of Cape Town; 2018. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/11427/27811.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ghoor IB. The response of concave singly curved fibre reinforced moulded sandwich and laminated composite panels to blast loading. [Thesis]. University of Cape Town; 2018. Available from: http://hdl.handle.net/11427/27811

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Maryland

7. Leiste, Hans Ulrich. Experimental Studies to Investigate Pressure Loading on Target Plates.

Degree: Mechanical Engineering, 2012, University of Maryland

URL: http://hdl.handle.net/1903/13542

► The pressure distribution on the bottom of an armored vehicle caused by a detonating explosive buried in soil has been long of interest in the… (more)

Subjects/Keywords: Mechanical engineering; Blast Loading; Buried Explosives; Impulse Measurement; Pressure Measurement; Scaling; Target Loading

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APA (6^th Edition):

Leiste, H. U. (2012). Experimental Studies to Investigate Pressure Loading on Target Plates. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/13542

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Leiste, Hans Ulrich. “Experimental Studies to Investigate Pressure Loading on Target Plates.” 2012. Thesis, University of Maryland. Accessed April 11, 2021. http://hdl.handle.net/1903/13542.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Leiste, Hans Ulrich. “Experimental Studies to Investigate Pressure Loading on Target Plates.” 2012. Web. 11 Apr 2021.

Vancouver:

Leiste HU. Experimental Studies to Investigate Pressure Loading on Target Plates. [Internet] [Thesis]. University of Maryland; 2012. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1903/13542.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Leiste HU. Experimental Studies to Investigate Pressure Loading on Target Plates. [Thesis]. University of Maryland; 2012. Available from: http://hdl.handle.net/1903/13542

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

8. Argod, Vikas. MPI ENABLED SHAPE OPTIMIZATION OF SOLID ISOTROPIC PLATES TO MITIGATE THE EFFECTS OF AIR BLAST LOADING .

Degree: 2009, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/9595

► This work presents a formal approach for optimizing the shape of freely supported isotropic plates to withstand air blast loading. Unique difficulties are presented in… (more)

Subjects/Keywords: Blast Loading; Shape Optimization; MPI

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APA (6^th Edition):

Argod, V. (2009). MPI ENABLED SHAPE OPTIMIZATION OF SOLID ISOTROPIC PLATES TO MITIGATE THE EFFECTS OF AIR BLAST LOADING . (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/9595

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Argod, Vikas. “MPI ENABLED SHAPE OPTIMIZATION OF SOLID ISOTROPIC PLATES TO MITIGATE THE EFFECTS OF AIR BLAST LOADING .” 2009. Thesis, Penn State University. Accessed April 11, 2021. https://submit-etda.libraries.psu.edu/catalog/9595.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Argod, Vikas. “MPI ENABLED SHAPE OPTIMIZATION OF SOLID ISOTROPIC PLATES TO MITIGATE THE EFFECTS OF AIR BLAST LOADING .” 2009. Web. 11 Apr 2021.

Vancouver:

Argod V. MPI ENABLED SHAPE OPTIMIZATION OF SOLID ISOTROPIC PLATES TO MITIGATE THE EFFECTS OF AIR BLAST LOADING . [Internet] [Thesis]. Penn State University; 2009. [cited 2021 Apr 11]. Available from: https://submit-etda.libraries.psu.edu/catalog/9595.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Argod V. MPI ENABLED SHAPE OPTIMIZATION OF SOLID ISOTROPIC PLATES TO MITIGATE THE EFFECTS OF AIR BLAST LOADING . [Thesis]. Penn State University; 2009. Available from: https://submit-etda.libraries.psu.edu/catalog/9595

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Ottawa

9. Melançon, Christian. Effect of High-Performance Concrete and Steel Materials on the Blast Performance of Reinforced Concrete One-Way Slabs .

Degree: 2016, University of Ottawa

URL: http://hdl.handle.net/10393/34102

► The mitigation of blast hazards on critical reinforced concrete structures has become a major concern in regards to the safety of people and the integrity… (more)

▼ The mitigation of blast hazards on critical reinforced concrete structures has become a major concern in regards to the safety of people and the integrity of buildings. Recent terrorist incidents and accidental explosions have demonstrated the need to study the effects of such threats on structures in order to develop effective methods of reducing the overall impact of blast loads. With the arrival of innovative materials such as steel fibre reinforced concrete (SFRC), ultra-high performance fibre reinforced concrete (UHPFRC) and high strength steel reinforcement, research is required in order to successfully adapt these new materials in blast-resistant structures. Hence, the objective of this thesis to conduct an experimental parametric study with the purpose of investigating the implementation of these innovative materials in reinforced concrete slabs and panels. As part of the study, a total of fourteen one-way slab specimens with different combinations of concrete, steel fibres and steel reinforcement are tested under simulated blast loads using the University of Ottawa Shock-Tube Facility. The test program includes three slabs constructed with normal-strength concrete, five slabs constructed with SFRC and six slabs constructed with UHPFRC. Among these specimens, four are reinforced with high-performance steel reinforcement. The specimens are subjected to repeated blast loading with gradually increasing reflected pressure and reflected impulse until failure. The performance of the slabs is studied using various criteria such as failure load and mode, maximum and residual deflections, as well as tensile cracking, spalling and secondary fragmentation control. The behaviour of all specimens is compared in different categories to determine the effects of concrete type, steel reinforcement type, steel fibre content and steel fibre type on blast performance. As part of the analytical study the response of the slab specimens is predicted using dynamic inelastic single-degree-of-freedom (SDOF) analysis. The dynamic analysis is conducted by generating load-deformation resistance functions for the slabs incorporating dynamic material properties.

Subjects/Keywords: UHPFRC; High-strength steel; SFRC; Blast resistance; Shockwave loading; Slabs

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APA (6^th Edition):

Melançon, C. (2016). Effect of High-Performance Concrete and Steel Materials on the Blast Performance of Reinforced Concrete One-Way Slabs . (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/34102

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Melançon, Christian. “Effect of High-Performance Concrete and Steel Materials on the Blast Performance of Reinforced Concrete One-Way Slabs .” 2016. Thesis, University of Ottawa. Accessed April 11, 2021. http://hdl.handle.net/10393/34102.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Melançon, Christian. “Effect of High-Performance Concrete and Steel Materials on the Blast Performance of Reinforced Concrete One-Way Slabs .” 2016. Web. 11 Apr 2021.

Vancouver:

Melançon C. Effect of High-Performance Concrete and Steel Materials on the Blast Performance of Reinforced Concrete One-Way Slabs . [Internet] [Thesis]. University of Ottawa; 2016. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10393/34102.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Melançon C. Effect of High-Performance Concrete and Steel Materials on the Blast Performance of Reinforced Concrete One-Way Slabs . [Thesis]. University of Ottawa; 2016. Available from: http://hdl.handle.net/10393/34102

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Missouri – Columbia

10. McWilliams, Trevor Ryan. Evaluation of conventional steel stud walls for blast design.

Degree: 2012, University of Missouri – Columbia

URL: http://hdl.handle.net/10355/35440

► [ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Cold-formed steel studs exhibit favorable properties of strength and ductility that could provide the… (more)

Subjects/Keywords: cold-formed steel; blast loading; static resistance; track-to-floor anchorage

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APA (6^th Edition):

McWilliams, T. R. (2012). Evaluation of conventional steel stud walls for blast design. (Thesis). University of Missouri – Columbia. Retrieved from http://hdl.handle.net/10355/35440

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

McWilliams, Trevor Ryan. “Evaluation of conventional steel stud walls for blast design.” 2012. Thesis, University of Missouri – Columbia. Accessed April 11, 2021. http://hdl.handle.net/10355/35440.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

McWilliams, Trevor Ryan. “Evaluation of conventional steel stud walls for blast design.” 2012. Web. 11 Apr 2021.

Vancouver:

McWilliams TR. Evaluation of conventional steel stud walls for blast design. [Internet] [Thesis]. University of Missouri – Columbia; 2012. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10355/35440.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

McWilliams TR. Evaluation of conventional steel stud walls for blast design. [Thesis]. University of Missouri – Columbia; 2012. Available from: http://hdl.handle.net/10355/35440

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Melbourne

11. Ackland, Kathryn Patricia. Deformation of polyurea-coated steel plates under localised blast loading.

Degree: 2013, University of Melbourne

URL: http://hdl.handle.net/11343/38232

► This thesis presents the results of experimental and numerical studies to investigate the effect of polyurea coatings on the deformation of steel plates under localised… (more)

▼ This thesis presents the results of experimental and numerical studies to investigate the effect of polyurea coatings on the deformation of steel plates under localised blast loading. Exploratory experiments and numerical modelling were initially performed to develop an explosive test methodology and provide validation data for preliminary numerical modelling. Using the developed methodology, explosive testing was conducted on bare and polyurea-coated steel plates, where the plate configurations all had the same areal density. It was found that the polyurea-coated plates resulted in higher residual deformations compared to the uncoated plates, with the residual deformations increasing with coating thickness (and hence increasing with thinner steel). High speed video footage of the events revealed that the polyurea coatings debonded and hyper-extended during the events, before coming to rest back against the plate. This resulted in transient deformations of the polyurea coatings which were approximately twice that of the bare steel plates. Following the explosive experiments, numerical modelling of the polyurea-coated plates under blast loading was conducted using AUTODYN®. The dimensions of the numerical mesh were selected through a sensitivity study. De-bonding of the polyurea was reproduced by using a thin layer of elements which failed at a designated principal stress value, which was tuned to fit the experimental measurements. The polyurea was modelled using a two-parameter Mooney-Rivlin relationship, the constants for which were validated in the preliminary simulations. The initial models of the explosive experiments showed excellent agreement with the experimental residual deformations of the plates, but under-predicted the peak transient deformations of the polyurea. To improve the model accuracy, tensile tests were conducted on the polyurea at various strain rates and used to fit new Mooney-Rivlin material model constants. The new material model constants gave improved results for the transient deformations of the polyurea coatings. Parametric studies were conducted using the validated material models to investigate the effect of bond strength, polyurea stiffness, polyurea bulk modulus and the coating location. It was found that the greatest improvement could be achieved by changing the coating location to the front (blast side) face of the steel plate instead of the back face. The coating performance could also be improved by increasing the polyurea stiffness or bulk modulus, or increasing the strength of the bond between the polyurea and the plate. None of the polyurea-coated plates in the parametric studies performed as well as a mass-equivalent steel plate. However, polyurea-coated steel plates may still be preferable for other reasons, for example when the coating is to be applied as an appliqué (add-on) armour.

Subjects/Keywords: polyurea; blast; AUTODYN; numerical modelling; explosive loading; steel plates

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ackland, K. P. (2013). Deformation of polyurea-coated steel plates under localised blast loading. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/38232

Chicago Manual of Style (16^th Edition):

Ackland, Kathryn Patricia. “Deformation of polyurea-coated steel plates under localised blast loading.” 2013. Doctoral Dissertation, University of Melbourne. Accessed April 11, 2021. http://hdl.handle.net/11343/38232.

MLA Handbook (7^th Edition):

Ackland, Kathryn Patricia. “Deformation of polyurea-coated steel plates under localised blast loading.” 2013. Web. 11 Apr 2021.

Vancouver:

Ackland KP. Deformation of polyurea-coated steel plates under localised blast loading. [Internet] [Doctoral dissertation]. University of Melbourne; 2013. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/11343/38232.

Council of Science Editors:

Ackland KP. Deformation of polyurea-coated steel plates under localised blast loading. [Doctoral Dissertation]. University of Melbourne; 2013. Available from: http://hdl.handle.net/11343/38232

University of Windsor

12. Amini, Keivan. Numerical Investigation into Axial Cutting of AA6061-T6 Circular Extrusions Under Blast Loading.

Degree: MA, Mechanical, Automotive, and Materials Engineering, 2012, University of Windsor

URL: https://scholar.uwindsor.ca/etd/5370

► The study detailed in this thesis focuses on the force/time and energy absorption performances of circular AA6061-T6 aluminum alloy extrusions with the wall thickness… (more)

Subjects/Keywords: AA6061-T6; Aluminum alloy; Blast loading; Crashworthiness; Energy absorption; Eulerian formulation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Amini, K. (2012). Numerical Investigation into Axial Cutting of AA6061-T6 Circular Extrusions Under Blast Loading. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5370

Chicago Manual of Style (16^th Edition):

Amini, Keivan. “Numerical Investigation into Axial Cutting of AA6061-T6 Circular Extrusions Under Blast Loading.” 2012. Masters Thesis, University of Windsor. Accessed April 11, 2021. https://scholar.uwindsor.ca/etd/5370.

MLA Handbook (7^th Edition):

Amini, Keivan. “Numerical Investigation into Axial Cutting of AA6061-T6 Circular Extrusions Under Blast Loading.” 2012. Web. 11 Apr 2021.

Vancouver:

Amini K. Numerical Investigation into Axial Cutting of AA6061-T6 Circular Extrusions Under Blast Loading. [Internet] [Masters thesis]. University of Windsor; 2012. [cited 2021 Apr 11]. Available from: https://scholar.uwindsor.ca/etd/5370.

Council of Science Editors:

Amini K. Numerical Investigation into Axial Cutting of AA6061-T6 Circular Extrusions Under Blast Loading. [Masters Thesis]. University of Windsor; 2012. Available from: https://scholar.uwindsor.ca/etd/5370

University of Melbourne

13. LUA, WEI. Blast loading on anchorage zones in cable-stayed bridges.

Degree: 2015, University of Melbourne

URL: http://hdl.handle.net/11343/55688

► Blast incidents, occurred under inadvertent and deliberate circumstances, will bring about detrimental economic and social impacts, both domestically as well as internationally. It is an… (more)

▼ Blast incidents, occurred under inadvertent and deliberate circumstances, will bring about detrimental economic and social impacts, both domestically as well as internationally. It is an irrefutable fact that blast-related issues are becoming overwhelmingly relevant to civil infrastructure, including cable-stayed bridges, an essential element in the vibrant transportation network. The principal objectives of this ground-breaking research include: determination of the fundamental blast response of cable anchorage zones, which leads to proposal of viable retrofitting techniques for existing facilities and feasible design guidelines for future assets; investigation of the disproportionate and progressive collapse mechanisms of cable-stayed bridges, and subsequent delivery of sensible mitigation strategies. Based on sophisticated finite element analysis, this study relies on: a global model, which contains only the critical details ideal for the collapse analysis; a local model, which retains the crucial features deemed indispensable for the blast simulation. Both person-borne-improvised-explosive-devices (appeared below the girder) as well as vehicle-borne-improvised-explosive-devices (positioned on top of the deck) are utilised. Blast-induced material breakdown will substantially weaken the anchorage precinct housed in the deck-and-girder system, and while residing in a deplorable state, if sufficient residual capacity is not retained, brittle ultimate crushing failure is inevitable under the sustained gravitational loading. The anchorage region managed to survive the event involving a compact or standard automobile, but not an ordinary truck or a movable package/equivalent, which gave rise to far more critical consequences. The anchorage point accommodated at the tower will not be adversely affected, and likewise for the cable. With the portable charge, the anchorage precinct remained serviceable only when the inner shield was installed along with the outer armour, but not independently; and likewise with the vehicle bomb, with or without the overlaying shelter (incapable of acting alone). Steel, instead of carbon-fibre-reinforced polymer, is competent to guarantee more remarkable defence. The credibility of a fortification scheme, in terms of energy dissipation, stiffness and confinement contribution, and restriction of matter disengagement, is not only dictated by material mass and attributes, but also the composite behaviour developed. Compatible with the traditional codes, the advanced design specifications are intended to be implemented through the integrated logistics, by adhering to the performance-based design principle. The innovative tactics identified include: alleviation of extreme blast action and conventional load effects, by raising the standoff distance and expanding the bearing plate; enhancement of blast endurance, by enlarging the anchorage region, augmenting the reinforcement and improving the concrete quality. The relative performance of the anchorage points is…

Subjects/Keywords: blast loading; anchorage zones; cable-stayed bridges; design guidelines; retrofitting techniques

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APA (6^th Edition):

LUA, W. (2015). Blast loading on anchorage zones in cable-stayed bridges. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/55688

Chicago Manual of Style (16^th Edition):

LUA, WEI. “Blast loading on anchorage zones in cable-stayed bridges.” 2015. Doctoral Dissertation, University of Melbourne. Accessed April 11, 2021. http://hdl.handle.net/11343/55688.

MLA Handbook (7^th Edition):

LUA, WEI. “Blast loading on anchorage zones in cable-stayed bridges.” 2015. Web. 11 Apr 2021.

Vancouver:

LUA W. Blast loading on anchorage zones in cable-stayed bridges. [Internet] [Doctoral dissertation]. University of Melbourne; 2015. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/11343/55688.

Council of Science Editors:

LUA W. Blast loading on anchorage zones in cable-stayed bridges. [Doctoral Dissertation]. University of Melbourne; 2015. Available from: http://hdl.handle.net/11343/55688

University of Oxford

14. Schiffer, Andreas. The response of submerged structures to underwater blast.

Degree: PhD, 2013, University of Oxford

URL: http://ora.ox.ac.uk/objects/uuid:4503e2e9-c712-4f8a-a6bb-9986981d56ab ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.581424

► The response of submerged structures subject to loading by underwater blast waves is governed by complex interactions between the moving or deforming structure and the… (more)

▼ The response of submerged structures subject to loading by underwater blast waves is governed by complex interactions between the moving or deforming structure and the surrounding fluid and these phenomena need to be thoroughly understood in order to design structural components against underwater blast. This thesis has addressed the response of simple structural systems to blast loading in shallow or deep water environment. Analytical models have been developed to examine the one-dimensional response of both water-backed and air-backed submerged rigid plates, supported by linear springs and loaded by underwater shock waves. Cavitation phenomena as well as the effect of initial static fluid pressure are explicitly included in the models and their predictions were found in excellent agreement with detailed FE simulations. Then, a novel experimental apparatus has been developed, to reproduce controlled blast loading in initially pressurised liquids. It consists of a transparent water shock tube and allows observing the structural response as well as the propagation of cavitation fronts initiated by fluid-structure interaction in a blast event. This experimental technique was then employed to explore the one-dimensional response of monolithic plates, sandwich panels and double-walled structures subject to loading by underwater shock waves. The performed experiments provide great visual insight into the cavitation process and the experimental measurements were found to be in good agreement with analytical predictions and dynamic FE results. Finally, underwater blast loading of circular elastic plates has been investigated by theoretically modelling the main phenomena of dynamic plate deformation and fluid-structure interaction. In addition, underwater shock experiments have been performed on circular composite plates and the obtained measurements were found in good correlation with the corresponding analytical predictions. The validated analytical models were then used to determine the optimal designs of circular elastic plates which maximise the resistance to underwater blast.

Subjects/Keywords: 627; Solid mechanics; Mechanical engineering; fluid-structure interaction; underwater blast; shock waves; finite elements; blast loading; cavitation; shock tube; sandwich plate; blast mitigation; dynamic loading

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Schiffer, A. (2013). The response of submerged structures to underwater blast. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:4503e2e9-c712-4f8a-a6bb-9986981d56ab ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.581424

Chicago Manual of Style (16^th Edition):

Schiffer, Andreas. “The response of submerged structures to underwater blast.” 2013. Doctoral Dissertation, University of Oxford. Accessed April 11, 2021. http://ora.ox.ac.uk/objects/uuid:4503e2e9-c712-4f8a-a6bb-9986981d56ab ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.581424.

MLA Handbook (7^th Edition):

Schiffer, Andreas. “The response of submerged structures to underwater blast.” 2013. Web. 11 Apr 2021.

Vancouver:

Schiffer A. The response of submerged structures to underwater blast. [Internet] [Doctoral dissertation]. University of Oxford; 2013. [cited 2021 Apr 11]. Available from: http://ora.ox.ac.uk/objects/uuid:4503e2e9-c712-4f8a-a6bb-9986981d56ab ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.581424.

Council of Science Editors:

Schiffer A. The response of submerged structures to underwater blast. [Doctoral Dissertation]. University of Oxford; 2013. Available from: http://ora.ox.ac.uk/objects/uuid:4503e2e9-c712-4f8a-a6bb-9986981d56ab ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.581424

McMaster University

15. Wybenga, Brent M. Capacity Quantification of Two-Way Arching Reinforced Masonry Walls under Blast Loads.

Degree: MASc, 2014, McMaster University

URL: http://hdl.handle.net/11375/14135

►

The focus of this study is on evaluating the performance of nine, one-third scale, arching, reinforced masonry (RM) walls subjected to blast loads and… (more)

▼

The focus of this study is on evaluating the performance of nine, one-third scale, arching, reinforced masonry (RM) walls subjected to blast loads and three, one-third scale arching, RM walls subjected to out-of-plane static airbag loads. These RM walls were supported on four sides to enforce two-way arching allowing the ability to monitor individual response to varying levels of blast loads and standoff distances. The uniformity of the blast pressure and impulse were ensured by a specifically designed test enclosure, diminishing the wrap-around and clearing effects, allowing valuable data to be documented. The damage levels noted, ranged from Superficial to Blowout compared directly to the CSA S850-12 performance limits. The outcome of this experiment demonstrates the beneficial effect of two-way arching on the flexural behaviour of RM walls under impulsive loading. The use of two-way arching RM walls significantly reduces structural damage and increases out-of-plane resistance, which in turn enhances the overall structural integrity and building preservation. Further, when subjected to blast, two-way arching RM walls considerably reduces debris and their dispersal, thus increasing public safety and minimizing hazard levels. When using the experimental test data results to calibrate finite element models (FEM), more analytical data points can be obtained and therefore getting a larger range of scaled distances and trials. The validation of the LS-DYNA model can be used as an alternative to the costly experimental data, as the information collected concluded that the FEM gave damage patterns and failure modes that were comparable with experimental results. The test data collected provides a better understanding of RM wall response to blast loads and to the ongoing Masonry Blast Performance Database (MBPD) project at McMaster University. The generated MBPD will in turn contribute to masonry design clauses in the future editions of the recently introduced Canadian Standards CSA S850-12 “Design and Assessment of Buildings Subjected to Blast Loads”.

Master of Applied Science (MASc)

Advisors/Committee Members: El-Dakhakhni, Wael, Mekky, Waleed, Civil Engineering.

Subjects/Keywords: arching; blast loading; blast scaling; experimental testing; out-of-plane; reinforced masonry; Civil Engineering; Structural Engineering; Civil Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wybenga, B. M. (2014). Capacity Quantification of Two-Way Arching Reinforced Masonry Walls under Blast Loads. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/14135

Chicago Manual of Style (16^th Edition):

Wybenga, Brent M. “Capacity Quantification of Two-Way Arching Reinforced Masonry Walls under Blast Loads.” 2014. Masters Thesis, McMaster University. Accessed April 11, 2021. http://hdl.handle.net/11375/14135.

MLA Handbook (7^th Edition):

Wybenga, Brent M. “Capacity Quantification of Two-Way Arching Reinforced Masonry Walls under Blast Loads.” 2014. Web. 11 Apr 2021.

Vancouver:

Wybenga BM. Capacity Quantification of Two-Way Arching Reinforced Masonry Walls under Blast Loads. [Internet] [Masters thesis]. McMaster University; 2014. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/11375/14135.

Council of Science Editors:

Wybenga BM. Capacity Quantification of Two-Way Arching Reinforced Masonry Walls under Blast Loads. [Masters Thesis]. McMaster University; 2014. Available from: http://hdl.handle.net/11375/14135

University of Edinburgh

16. Mourão, Rodrigo Ferreiro Fernandes. Blast loading effects on externally strengthened concrete structures.

Degree: PhD, 2020, University of Edinburgh

URL: http://hdl.handle.net/1842/37030

► Concrete is a commonly used construction material in both civil and military infrastructures. Over the last few decades, it has been widely demonstrated that the… (more)

▼ Concrete is a commonly used construction material in both civil and military infrastructures. Over the last few decades, it has been widely demonstrated that the use of externally bonded fibre reinforced composites (FRP) is an efficient technique to strengthen such infrastructures to resist increased static loads for which they were not designed for. Nevertheless, the use of these techniques for improving the blast capacity of reinforced concrete (RC) structures has only recently been studied. Although such studies have highlighted an effective enhancement of the bearing capacity of RC members under explosions, no particular attention has been paid to the influence of blast loading on the performance of the bonded interface. This work presents a set of experimental campaigns to investigate and quantify the influence of blast loading on the structural resistance of FRP strengthened concrete structures with the focus on the performance of the bonded joint. Primarily, this research experimentally examines the quasi-static and blast performance of RC beams with externally bonded FRP strips. Experimental findings reveal that although the structural performance is comparable between both loading cases, the failure mechanism of FRP is different. Finite element models are developed and calibrated against experimental data and used to investigate in detail the reasons behind such difference. Secondly, a combined experimental/numerical investigation is performed on the influence of externally bonded FRP strips on the damage extent of concrete subjected to contact detonations. Twenty-seven contact detonations were conducted on concrete plates to verify the influence of bonding area, mass of attached material and concrete strength. Results reveal that FRP strips have a clear influence on the damage extent of concrete. By developing a finite element model of the experimental setup, it is found that the combination of momentum transmitted to the FRP together with the bonding effect gives rise to a complementary damage mechanism, leading to larger damaged areas. Additionally, current analytical methods to predict the structural performance of RC structures under blast loading, such as the single-degree-of-freedom, rely on the assumption that full bond is kept upon the structural failure, and as such are inadequate at providing a valid prediction of structural performance when disruption of FRP is an issue, as this directly influences the establishment of force-deflection characteristics of the member. To this end, commonly accepted design approximations for the establishment of force-deformation characteristics are discussed and an innovative method is proposed. SDOF analysis are conducted using the different modelling approaches and results are compared and discussed against experimental data. This PhD thesis highlight the complex behaviour of concrete structures strengthened with externally bonded FRP under blast loading, mostly when disruption of FRP is achieved, and should dissipate the idea that a design is accurate if…

Subjects/Keywords: reinforced concrete; fibre-reinforce polymers; blast loading; carbon-fibre composite material; extreme loading conditions; concrete-FRP; stress waves; damage mechanism

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mourão, R. F. F. (2020). Blast loading effects on externally strengthened concrete structures. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/37030

Chicago Manual of Style (16^th Edition):

Mourão, Rodrigo Ferreiro Fernandes. “Blast loading effects on externally strengthened concrete structures.” 2020. Doctoral Dissertation, University of Edinburgh. Accessed April 11, 2021. http://hdl.handle.net/1842/37030.

MLA Handbook (7^th Edition):

Mourão, Rodrigo Ferreiro Fernandes. “Blast loading effects on externally strengthened concrete structures.” 2020. Web. 11 Apr 2021.

Vancouver:

Mourão RFF. Blast loading effects on externally strengthened concrete structures. [Internet] [Doctoral dissertation]. University of Edinburgh; 2020. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1842/37030.

Council of Science Editors:

Mourão RFF. Blast loading effects on externally strengthened concrete structures. [Doctoral Dissertation]. University of Edinburgh; 2020. Available from: http://hdl.handle.net/1842/37030

University of Edinburgh

17. Mourão, Rodrigo Ferreiro Fernandes. Blast loading effects on externally strengthened concrete structures.

Degree: PhD, 2020, University of Edinburgh

URL: https://doi.org/10.7488/era/331 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.806143

► Concrete is a commonly used construction material in both civil and military infrastructures. Over the last few decades, it has been widely demonstrated that the… (more)

▼ Concrete is a commonly used construction material in both civil and military infrastructures. Over the last few decades, it has been widely demonstrated that the use of externally bonded fibre reinforced composites (FRP) is an efficient technique to strengthen such infrastructures to resist increased static loads for which they were not designed for. Nevertheless, the use of these techniques for improving the blast capacity of reinforced concrete (RC) structures has only recently been studied. Although such studies have highlighted an effective enhancement of the bearing capacity of RC members under explosions, no particular attention has been paid to the influence of blast loading on the performance of the bonded interface. This work presents a set of experimental campaigns to investigate and quantify the influence of blast loading on the structural resistance of FRP strengthened concrete structures with the focus on the performance of the bonded joint. Primarily, this research experimentally examines the quasi-static and blast performance of RC beams with externally bonded FRP strips. Experimental findings reveal that although the structural performance is comparable between both loading cases, the failure mechanism of FRP is different. Finite element models are developed and calibrated against experimental data and used to investigate in detail the reasons behind such difference. Secondly, a combined experimental/numerical investigation is performed on the influence of externally bonded FRP strips on the damage extent of concrete subjected to contact detonations. Twenty-seven contact detonations were conducted on concrete plates to verify the influence of bonding area, mass of attached material and concrete strength. Results reveal that FRP strips have a clear influence on the damage extent of concrete. By developing a finite element model of the experimental setup, it is found that the combination of momentum transmitted to the FRP together with the bonding effect gives rise to a complementary damage mechanism, leading to larger damaged areas. Additionally, current analytical methods to predict the structural performance of RC structures under blast loading, such as the single-degree-of-freedom, rely on the assumption that full bond is kept upon the structural failure, and as such are inadequate at providing a valid prediction of structural performance when disruption of FRP is an issue, as this directly influences the establishment of force-deflection characteristics of the member. To this end, commonly accepted design approximations for the establishment of force-deformation characteristics are discussed and an innovative method is proposed. SDOF analysis are conducted using the different modelling approaches and results are compared and discussed against experimental data. This PhD thesis highlight the complex behaviour of concrete structures strengthened with externally bonded FRP under blast loading, mostly when disruption of FRP is achieved, and should dissipate the idea that a design is accurate if…

Subjects/Keywords: reinforced concrete; fibre-reinforce polymers; blast loading; carbon-fibre composite material; extreme loading conditions; concrete-FRP; stress waves; damage mechanism

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mourão, R. F. F. (2020). Blast loading effects on externally strengthened concrete structures. (Doctoral Dissertation). University of Edinburgh. Retrieved from https://doi.org/10.7488/era/331 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.806143

Chicago Manual of Style (16^th Edition):

Mourão, Rodrigo Ferreiro Fernandes. “Blast loading effects on externally strengthened concrete structures.” 2020. Doctoral Dissertation, University of Edinburgh. Accessed April 11, 2021. https://doi.org/10.7488/era/331 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.806143.

MLA Handbook (7^th Edition):

Mourão, Rodrigo Ferreiro Fernandes. “Blast loading effects on externally strengthened concrete structures.” 2020. Web. 11 Apr 2021.

Vancouver:

Mourão RFF. Blast loading effects on externally strengthened concrete structures. [Internet] [Doctoral dissertation]. University of Edinburgh; 2020. [cited 2021 Apr 11]. Available from: https://doi.org/10.7488/era/331 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.806143.

Council of Science Editors:

Mourão RFF. Blast loading effects on externally strengthened concrete structures. [Doctoral Dissertation]. University of Edinburgh; 2020. Available from: https://doi.org/10.7488/era/331 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.806143

Indian Institute of Science

18. Upadhyay, Anil Kumar. Blast Loading on Plain and Perforated Tubes with High Explosives.

Degree: PhD, Engineering, 2020, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/4342

► According to the assessments of the United Nations, there are more than 100 million mines lying buried in various conflict zones of many countries in… (more)

▼ According to the assessments of the United Nations, there are more than 100 million mines lying buried in various conflict zones of many countries in the world. As per their assessment, many thousand casualties happen every year. Most of the demining operations are generally carried out after the conflicts end. This task is one of the most challenging and always a risky operation. There are various demining equipment available world-wide to perform this job in addition to the manual demining of minefield by trained soldiers. Explosive loading on machine components of service vehicles during military operations is a complex process. The complexity stems from unpredictable detonation, complicated component geometry and geographical terrain, debris effects etc. Consequently, the damage on structural components becomes highly unpredictable. There are too many other environmental parameters contributing to the final damage. In this context, both high explosive loading and material response behave like independent random variables. Blast loading on tubes and plates is vital in the design of combat and demining equipment of real life situations. Therefore, study of plain circular tubes (PCT), perforated circular tubes (PRCT) and plates subjected to blast loading due to explosion of high explosives such as TNT, RDX and TETRYL has been considered in the present thesis. Due to various design constraints, it is extremely difficult to design these components for desired service life for high quantum of blast load. This thesis explains the uses of perforations for handling this inevitable and extreme condition of loading on the target components. It is pertinent to note that the various blast parameters such as time of sight, overpressure, impulse etc. available in the literature are not reliable for close range of explosion of high explosive for scaled distance in order of 0.40 m/kg1/3. Therefore, it is essential to establish and quantify some of these parameters for close range blast, which will be useful for real life design problems. Accordingly, the present thesis covers experimental and numerical study of plain circular tube (PCT) and perforated circular tube (PRCT) under blast loading of high explosive. iv CONWEP code has been used for numerical simulation of PCT and PRCT subjected to blast loading. Some important blast parameters have been established in this research. It has been shown that there is approximately 58 % reduction in blast impact on the tube due to use of perforation. Square and hexagonal pattern of perforation has been studied. Theory of strong explosion has been discussed in the present thesis. Non-dimensional time and length scale has been proposed in place of scaled distance. Also, simplified empirical formula has been proposed for estimation of time of sight for close range blast covering scaled distance 0.40 m/kg1/3 - 0.45 m/kg1/3. Advisors/Committee Members: Simha, K R Y (advisor).

Subjects/Keywords: Explosion; TNT; CONWEP; ACCELERATION; INCIDENT PRESSURE; Tri Nitro Toluene; Blast loading on cylindrical tubes

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Upadhyay, A. K. (2020). Blast Loading on Plain and Perforated Tubes with High Explosives. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/4342

Chicago Manual of Style (16^th Edition):

Upadhyay, Anil Kumar. “Blast Loading on Plain and Perforated Tubes with High Explosives.” 2020. Doctoral Dissertation, Indian Institute of Science. Accessed April 11, 2021. http://etd.iisc.ac.in/handle/2005/4342.

MLA Handbook (7^th Edition):

Upadhyay, Anil Kumar. “Blast Loading on Plain and Perforated Tubes with High Explosives.” 2020. Web. 11 Apr 2021.

Vancouver:

Upadhyay AK. Blast Loading on Plain and Perforated Tubes with High Explosives. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2020. [cited 2021 Apr 11]. Available from: http://etd.iisc.ac.in/handle/2005/4342.

Council of Science Editors:

Upadhyay AK. Blast Loading on Plain and Perforated Tubes with High Explosives. [Doctoral Dissertation]. Indian Institute of Science; 2020. Available from: http://etd.iisc.ac.in/handle/2005/4342

RMIT University

19. McDonald, B. Characterising material effects in blast protection.

Degree: 2019, RMIT University

URL: http://researchbank.rmit.edu.au/view/rmit:162744

► Higher strength grades of modern armour steel have promising applications in the blast protection system of armoured vehicles due to the combination of high strength,… (more)

▼ Higher strength grades of modern armour steel have promising applications in the blast protection system of armoured vehicles due to the combination of high strength, good energy absorption capacity and familiar fabrication techniques for vehicle manufacturers. While higher strength grades of armour steel are used regularly for ballistic protection and have been integrated into other areas of a vehicle armour systems, there is limited understanding of the response of this class of materials to localised blast loading and further their performance in a blast protection application is unclear. This thesis produces new knowledge and predictive tools regarding the deformation and fracture response of multiple grades of high strength armour steel subjected to localised blast loading. The response of four grades of high strength steel to localised blast loading was characterised through an extensive experimental investigation, providing significant new insight into the protective capacity provided by high strength, moderate ductility armour steels. The steels tested include three grades of armour steel: rolled homogeneous armour (RHA), improved rolled homogeneous armour (IRHA) and high hardness armour (HHA) as well as a high strength abrasive resistant steel (ARS) with a transformation induced plasticity (TRIP) strengthening phase. Quadrangular target plates were tested using cylindrical charges of PE4 plastic explosive at stand-off distances (SOD) from the target plate between 13 mm and 50 mm. The wide range of blast loading conditions produced localised bulging of the target plates through to rupture and wide-spread fracture propagation. Along with a thorough assessment of target plate deformation, the magnitude of blast loading required to rupture the four armour steels was isolated at a 13 mm and 25 mm stand-off distance. The rupture threshold of the armour materials was significantly higher than more ductile mild steel evaluated extensively in the literature. ARS, which possessed the highest rupture threshold of the armour materials, fractured at a charge mass 81% higher than the mild steel. Fractographic analysis showed that the high strength steels investigated initiated rupture via ductile shear fracture, as opposed to tensile tearing which is common in lower-strength steels. Cracks were propagated by a variety of ductile tensile and shear modes as well as a brittle radial crack propagation mode identified for the HHA steel. For the first time, the significant effect of SOD on the target response under free air blast loading was incorporated into a non-dimensional impulse parameter (NDIP) framework. The SOD impulse correction parameter was formulated to capture the more concentrated spatial distribution of blast loading and the contribution of a transverse shear response mode within the target plate, associated with reductions in SOD. The new SOD dependant NDIP produced significant improvements in the prediction of non-dimensional deflection across a large range of experimental programs and identified a…

Subjects/Keywords: Fields of Research; Blast loading; Armour steel; Fracture; Numerical modelling; Mechanical testing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

McDonald, B. (2019). Characterising material effects in blast protection. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:162744

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

McDonald, B. “Characterising material effects in blast protection.” 2019. Thesis, RMIT University. Accessed April 11, 2021. http://researchbank.rmit.edu.au/view/rmit:162744.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

McDonald, B. “Characterising material effects in blast protection.” 2019. Web. 11 Apr 2021.

Vancouver:

McDonald B. Characterising material effects in blast protection. [Internet] [Thesis]. RMIT University; 2019. [cited 2021 Apr 11]. Available from: http://researchbank.rmit.edu.au/view/rmit:162744.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

McDonald B. Characterising material effects in blast protection. [Thesis]. RMIT University; 2019. Available from: http://researchbank.rmit.edu.au/view/rmit:162744

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Notre Dame

20. John Charles Goetz. Analysis and Optimization of Multi-Layered Cellular Systems for Pulse Loading</h1>.

Degree: Aerospace and Mechanical Engineering, 2013, University of Notre Dame

URL: https://curate.nd.edu/show/4b29b566213

► Two methods and models are presented to solve the nonlinear wave equation with shock formation using mass, momentum, and energy conservation in multi-layer one-dimensional… (more)

▼ Two methods and models are presented to solve the nonlinear wave equation with shock formation using mass, momentum, and energy conservation in multi-layer one-dimensional rods made of cellular material. Using the method of characteristics, the rigid-perfectly-plastic-locking model is proven to be unable to predict shock formation at a material interface. Thus, a rate-independent mechanical model is proposed and incorporates an elastic-plastic-densifying material model to describe the stress-strain behavior of the cellular materials. The conditions for shock formation at a material interface are provided. A two-layer analysis is conducted to gain insights into the behavior of two-layer cellular systems and to determine which material properties are most important for design. Finally, the significant parameters are optimized to reduce the length of one- and two-layered cellular systems with impulse and mass constraints subject to pulse loading. The results reinforce the concept of sandwich structures and show that two-layer systems can achieve a 30% reduction in length over single layer ones. Next, a rate-dependent thermo-mechanical model is used to incorporate thermal and viscoplastic effects; the finite difference method is used to solve this model. Analysis of 1-layer systems reveals a viscoplastic stress spike on the distal boundary. Additionally, experimentally observed stress amplification is determined to be a function of the material velocity behind the incident shock in the layer. The amplification amount is derived analytically and matches well with existing models. Initial and boundary condition studies on the one-dimensional multi-layer cellular systems are conducted. The results indicate that pre-stressing and convex density arrangements reduce the peak impulses transferred through the system. Increasing temperature is found to increase system crush while reducing distal stress. Further, load pulse shape affects the shape of shocks and transmitted loads. Finally, increasing the number of layers in an even length distribution will reduce the performance of the material if the same linear density gradient is used. These results indicate a significant leap in the understanding of multi-layer cellular materials subject to pulse loads. Advisors/Committee Members: Gretar Tryggvason, Committee Member, Andr&#233s Tovar, Committee Member, Karel Matou&#353, Committee Chair, James Schmiedeler, Committee Member.

Subjects/Keywords: Finite Difference; Cellular materials; Pulse loading; Shock wave; Method of characteristics; Blast

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Goetz, J. C. (2013). Analysis and Optimization of Multi-Layered Cellular Systems for Pulse Loading</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/4b29b566213

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Goetz, John Charles. “Analysis and Optimization of Multi-Layered Cellular Systems for Pulse Loading</h1>.” 2013. Thesis, University of Notre Dame. Accessed April 11, 2021. https://curate.nd.edu/show/4b29b566213.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Goetz, John Charles. “Analysis and Optimization of Multi-Layered Cellular Systems for Pulse Loading</h1>.” 2013. Web. 11 Apr 2021.

Vancouver:

Goetz JC. Analysis and Optimization of Multi-Layered Cellular Systems for Pulse Loading</h1>. [Internet] [Thesis]. University of Notre Dame; 2013. [cited 2021 Apr 11]. Available from: https://curate.nd.edu/show/4b29b566213.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Goetz JC. Analysis and Optimization of Multi-Layered Cellular Systems for Pulse Loading</h1>. [Thesis]. University of Notre Dame; 2013. Available from: https://curate.nd.edu/show/4b29b566213

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Melbourne

21. Raman, Sudharshan Naidu. Polymeric coatings for enhanced protection of reinforced concrete structures from the effects of blast.

Degree: 2011, University of Melbourne

URL: http://hdl.handle.net/11343/36786

► Reinforced concrete (RC) structural systems dominate the construction of buildings and infrastructure in Australia, as well as in most parts of the world. The increase… (more)

▼ Reinforced concrete (RC) structural systems dominate the construction of buildings and infrastructure in Australia, as well as in most parts of the world. The increase in terrorist activities, accidental explosions and proliferation of weapons in recent years has made these structures more vulnerable to extreme impulsive loadings. Due to these developments, structural and material engineers are seeking to develop innovative and technically feasible protective solutions to protect critical RC infrastructure and to mitigate the damage resulting from such extreme loading events. This research evaluates the potential of using an elastomeric polymer (i.e. polyurea) to develop an innovative structural retrofitting application to enhance the resistance of RC structural elements to blast effects. The polymeric material is applied on to the structure as a protective coating, by using a spray-on procedure. The overall research involved comprehensive experimental, analytical and numerical investigation programs to evaluate the effectiveness and technical reliability of this technique. Experimental investigations were undertaken to evaluate the contribution of enhanced strain rates on the mechanical properties and behaviour of polyurea in comparison to its quasi-static properties. The findings were used to establish the stress–strain characteristics and other dynamic mechanical properties of the polymer in the strain rate ranges of 0.006 to 388 s-1. It was observed that the stress–strain behaviour of polyurea at high strain rates was considerably non-linear and exhibited significant rate dependency. Subsequently, constitutive equations were developed to characterise the dynamic increase factor (DIF) of various mechanical properties of this material at higher strain rates. The second experimental program involved the assessment of several unretrofitted and polyurea coated panels in a series of blast trials. The polyurea coatings applied on each of the retrofitted panels were unique in terms of coating thickness and location combinations. The findings of these trials indicated that polyurea coating contributes significantly in reducing the damage to the structural elements from the blast effects. Furthermore, it was also observed that the location of application of the protective coating play a major role in the level of protection offered by the retrofitting scheme. The experimental findings were also utilised in verifying the finite element (FE) models developed in the numerical analyses stage. The FE analyses were performed using the explicit solver of the non-linear FE code, LS-DYNA. Six different material models available in LS-DYNA were selected to model and simulate the behaviour of the polyurea, and the feasibility of each of this material model in representing the comprehensive strain rate parameters of the polymer were emphasised. The significance of the constitutive equations developed…

Subjects/Keywords: blast loading; finite element analyses; polymer coating; polyurea; reinforced concrete (RC); retrofitting; strain rate

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Raman, S. N. (2011). Polymeric coatings for enhanced protection of reinforced concrete structures from the effects of blast. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/36786

Chicago Manual of Style (16^th Edition):

Raman, Sudharshan Naidu. “Polymeric coatings for enhanced protection of reinforced concrete structures from the effects of blast.” 2011. Doctoral Dissertation, University of Melbourne. Accessed April 11, 2021. http://hdl.handle.net/11343/36786.

MLA Handbook (7^th Edition):

Raman, Sudharshan Naidu. “Polymeric coatings for enhanced protection of reinforced concrete structures from the effects of blast.” 2011. Web. 11 Apr 2021.

Vancouver:

Raman SN. Polymeric coatings for enhanced protection of reinforced concrete structures from the effects of blast. [Internet] [Doctoral dissertation]. University of Melbourne; 2011. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/11343/36786.

Council of Science Editors:

Raman SN. Polymeric coatings for enhanced protection of reinforced concrete structures from the effects of blast. [Doctoral Dissertation]. University of Melbourne; 2011. Available from: http://hdl.handle.net/11343/36786

University of Edinburgh

22. Caçoilo, Andreia Patrícia Gandarinho. Blast wave propagation in confined spaces and its action on structures.

Degree: PhD, 2020, University of Edinburgh

URL: http://hdl.handle.net/1842/36818

► The safety of both military personnel and equipment in unstable regions has for a long time been a major issue and concern. Protective shelters with… (more)

▼ The safety of both military personnel and equipment in unstable regions has for a long time been a major issue and concern. Protective shelters with multiple configurations have been widely used to meet safety requirements. Since military compounds are subjected to di↵erent types of threats, such as explosive devices, it is of utmost importance a good understanding of the response of such shielding structures to blast waves. Accordingly, propagation of shock waves in partially- or fully-confined environments is a complex phenomenon due to the possibility of multiple reflections, di↵ractions and superposition of waves. Yet, being able to derive valid predictions of such phenomena is highly relevant, e.g. when it comes to the assessment of protection of personnel. This study looks at the propagation of blast waves in confined spaces and its action on structures, such as compound survival shelters. Whilst full-scale tests o↵er useful insights, the time and expenses associated with such experiments renders then unpracticable. Small-scale experimental models in combination with the Hopkinson- Cranz scaling laws, however, represent a viable alternative to the study of blast wave evolution. The experimental set-up was designed as a rigid structure and built to have a geometrical reduction factor across all dimensions. Experimental analyses were performed on a small-scale model of the actual configuration of the compound survival shelter subjected to the detonation of an explosive charge at di↵erent locations close to its entrance. Pressure-time signals were recorded on a number of locations in the model and a numerical model, based on the explicit finite element code LS-DYNA, was also developed to complement the experimental programme. The recorded experimental data were compared with the numerical predictions to validate the FE model. The proposed numerical model predicts and captures the relevant stages of the propagation of the shock wave. The study of blast wave propagation, which is di↵erent from the propagation of a shock wave in free-field scenarios, is not completely described in literature, especially when it comes to structural response. A numerical analysis of a single corrugated member was performed to evaluate the influence of several wave related parameters on its structural response, e.g. impulse, multiple positive and negative pressure profiles and signal simplifications. Results indicate that the negative impulse train in the pressure-time history plays a significant role in obtaining an accurate performance of the structure. It was also found that a complex pressure history profile can be reduced to a simplified pulse for structural analysis purposes. The consequence of blast events, namely terrorist attacks, warfare scenarios or accidental explosions, usually means severe damage of structures and loss of life. Pressure-impulse diagrams are widely used as a rapid and intuitive tool to investigate the blast response of structural elements under a number of di↵erent blast scenarios. In this study, a…

Subjects/Keywords: protective shelters; safety requirements; shelter configuration; sea containers; blast waves; shock waves; confined spaces; blast wave propagation; pressure history profile; structural analysis; blast loading; pressure-impulse diagrams

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Caçoilo, A. P. G. (2020). Blast wave propagation in confined spaces and its action on structures. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/36818

Chicago Manual of Style (16^th Edition):

Caçoilo, Andreia Patrícia Gandarinho. “Blast wave propagation in confined spaces and its action on structures.” 2020. Doctoral Dissertation, University of Edinburgh. Accessed April 11, 2021. http://hdl.handle.net/1842/36818.

MLA Handbook (7^th Edition):

Caçoilo, Andreia Patrícia Gandarinho. “Blast wave propagation in confined spaces and its action on structures.” 2020. Web. 11 Apr 2021.

Vancouver:

Caçoilo APG. Blast wave propagation in confined spaces and its action on structures. [Internet] [Doctoral dissertation]. University of Edinburgh; 2020. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1842/36818.

Council of Science Editors:

Caçoilo APG. Blast wave propagation in confined spaces and its action on structures. [Doctoral Dissertation]. University of Edinburgh; 2020. Available from: http://hdl.handle.net/1842/36818

University of Edinburgh

23. Caçoilo, Andreia Patrícia Gandarinho. Blast wave propagation in confined spaces and its action on structures.

Degree: PhD, 2020, University of Edinburgh

URL: https://doi.org/10.7488/era/120 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.799046

► The safety of both military personnel and equipment in unstable regions has for a long time been a major issue and concern. Protective shelters with… (more)

▼ The safety of both military personnel and equipment in unstable regions has for a long time been a major issue and concern. Protective shelters with multiple configurations have been widely used to meet safety requirements. Since military compounds are subjected to di↵erent types of threats, such as explosive devices, it is of utmost importance a good understanding of the response of such shielding structures to blast waves. Accordingly, propagation of shock waves in partially- or fully-confined environments is a complex phenomenon due to the possibility of multiple reflections, di↵ractions and superposition of waves. Yet, being able to derive valid predictions of such phenomena is highly relevant, e.g. when it comes to the assessment of protection of personnel. This study looks at the propagation of blast waves in confined spaces and its action on structures, such as compound survival shelters. Whilst full-scale tests o↵er useful insights, the time and expenses associated with such experiments renders then unpracticable. Small-scale experimental models in combination with the Hopkinson- Cranz scaling laws, however, represent a viable alternative to the study of blast wave evolution. The experimental set-up was designed as a rigid structure and built to have a geometrical reduction factor across all dimensions. Experimental analyses were performed on a small-scale model of the actual configuration of the compound survival shelter subjected to the detonation of an explosive charge at di↵erent locations close to its entrance. Pressure-time signals were recorded on a number of locations in the model and a numerical model, based on the explicit finite element code LS-DYNA, was also developed to complement the experimental programme. The recorded experimental data were compared with the numerical predictions to validate the FE model. The proposed numerical model predicts and captures the relevant stages of the propagation of the shock wave. The study of blast wave propagation, which is di↵erent from the propagation of a shock wave in free-field scenarios, is not completely described in literature, especially when it comes to structural response. A numerical analysis of a single corrugated member was performed to evaluate the influence of several wave related parameters on its structural response, e.g. impulse, multiple positive and negative pressure profiles and signal simplifications. Results indicate that the negative impulse train in the pressure-time history plays a significant role in obtaining an accurate performance of the structure. It was also found that a complex pressure history profile can be reduced to a simplified pulse for structural analysis purposes. The consequence of blast events, namely terrorist attacks, warfare scenarios or accidental explosions, usually means severe damage of structures and loss of life. Pressure-impulse diagrams are widely used as a rapid and intuitive tool to investigate the blast response of structural elements under a number of di↵erent blast scenarios. In this study, a…

Subjects/Keywords: protective shelters; safety requirements; shelter configuration; sea containers; blast waves; shock waves; confined spaces; blast wave propagation; pressure history profile; structural analysis; blast loading; pressure-impulse diagrams

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Caçoilo, A. P. G. (2020). Blast wave propagation in confined spaces and its action on structures. (Doctoral Dissertation). University of Edinburgh. Retrieved from https://doi.org/10.7488/era/120 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.799046

Chicago Manual of Style (16^th Edition):

Caçoilo, Andreia Patrícia Gandarinho. “Blast wave propagation in confined spaces and its action on structures.” 2020. Doctoral Dissertation, University of Edinburgh. Accessed April 11, 2021. https://doi.org/10.7488/era/120 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.799046.

MLA Handbook (7^th Edition):

Caçoilo, Andreia Patrícia Gandarinho. “Blast wave propagation in confined spaces and its action on structures.” 2020. Web. 11 Apr 2021.

Vancouver:

Caçoilo APG. Blast wave propagation in confined spaces and its action on structures. [Internet] [Doctoral dissertation]. University of Edinburgh; 2020. [cited 2021 Apr 11]. Available from: https://doi.org/10.7488/era/120 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.799046.

Council of Science Editors:

Caçoilo APG. Blast wave propagation in confined spaces and its action on structures. [Doctoral Dissertation]. University of Edinburgh; 2020. Available from: https://doi.org/10.7488/era/120 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.799046

University of Ottawa

24. Fan, Jin. Response of Reinforced Concrete Reservoir Walls Subjected to Blast Loading .

Degree: 2014, University of Ottawa

URL: http://hdl.handle.net/10393/31441

► Recent events including deliberate terrorist attacks and accidental explosions have highlighted the need for comprehensive research in the area of structural response to blast loading.… (more)

▼ Recent events including deliberate terrorist attacks and accidental explosions have highlighted the need for comprehensive research in the area of structural response to blast loading. Research in this area has recently received significant attention by the civil engineering community. Reinforced Concrete (RC) water reservoir tanks are an integral part of the critical infrastructure network of urban centers and are vulnerable to blast loading. However, there is a lack of research and knowledge on the performance of RC reservoir walls under blast loading. The objective of this research study is to experimentally investigate the performance of reinforced concrete reservoir walls subjected to blast loading and to analyze the structural response. This study provides experimental test data on the performance of reinforced concrete reservoir walls under blast loading and complementary analytical predictions using the Singe-Degree-Of-Freedom (SDOF) analysis method. The reservoir walls in this study were designed according to the water volume capacity using the Portland Cement Association (PCA 1993) methodology. The design was validated using software SAP 2000. The experimental program involved the construction and simulated blast testing of two RC reservoir wall specimens with different support conditions: (1) two opposite lateral edges fixed, bottom edge pinned and top edge free; and (2) two opposite lateral edges fixed, and bottom and top edges free. The first boundary condition was intended to promote two-way bending action, while the second was dominated by one-way bending. The two specimens were each subjected to a total of six consecutive incrementally increasing blast tests. The experimental program was conducted in the shock tube testing facility that is housed in the University of Ottawa. Wall displacements, reinforcement strains, and reflected pressures and impulses were measured during testing. Analytical calculations were conducted using the equivalent SDOF method to simulate the dynamic response of the RC reservoir wall specimens under different blast loadings. Published tables, charts and coefficients contained in Biggs (1964) and UFC 3-340-02 (2008) were adopted in the equivalent SDOF calculations. The analytical results were compared against the ii experimental data. The SDOF method predicted smaller displacements than those recorded during testing. The approximate nature of the parameters and tables used in the equivalent SDOF calculations contributed to the discrepancy between the analytical and experimental results. Furthermore, assumptions regarding the support conditions and neglecting residual damage from previous blast tests contributed to the underestimation of the displacements.

Subjects/Keywords: blast loading; shock tube; SDOF method; structural response; RC reservoir wall; support condition; one-way bending; two-way bending; reflected pressure; reflected impulse; yield; blast test; displacement; strain

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Fan, J. (2014). Response of Reinforced Concrete Reservoir Walls Subjected to Blast Loading . (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/31441

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Fan, Jin. “Response of Reinforced Concrete Reservoir Walls Subjected to Blast Loading .” 2014. Thesis, University of Ottawa. Accessed April 11, 2021. http://hdl.handle.net/10393/31441.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Fan, Jin. “Response of Reinforced Concrete Reservoir Walls Subjected to Blast Loading .” 2014. Web. 11 Apr 2021.

Vancouver:

Fan J. Response of Reinforced Concrete Reservoir Walls Subjected to Blast Loading . [Internet] [Thesis]. University of Ottawa; 2014. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10393/31441.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Fan J. Response of Reinforced Concrete Reservoir Walls Subjected to Blast Loading . [Thesis]. University of Ottawa; 2014. Available from: http://hdl.handle.net/10393/31441

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Kentucky

25. Calnan, Joshua. EXPERIMENTAL COMPARISON STUDY OF THE RESPONSE OF POLYCARBONATE AND LAMINATED GLASS BLAST RESISTANT GLAZING SYSTEMS TO BLAST LOADING.

Degree: 2013, University of Kentucky

URL: https://uknowledge.uky.edu/mng_etds/2

► This thesis recounts the experimental study of the dynamic response of polycarbonate blast resistant glazing systems to explosive loading through the use of triaxial load… (more)

Subjects/Keywords: Polycarbonate; Laminated Glass; Blast Loading; Blast Resistant Glazing System; Dynamic Response; Civil Engineering; Engineering Science and Materials; Mining Engineering; Risk Analysis; Structural Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Calnan, J. (2013). EXPERIMENTAL COMPARISON STUDY OF THE RESPONSE OF POLYCARBONATE AND LAMINATED GLASS BLAST RESISTANT GLAZING SYSTEMS TO BLAST LOADING. (Masters Thesis). University of Kentucky. Retrieved from https://uknowledge.uky.edu/mng_etds/2

Chicago Manual of Style (16^th Edition):

Calnan, Joshua. “EXPERIMENTAL COMPARISON STUDY OF THE RESPONSE OF POLYCARBONATE AND LAMINATED GLASS BLAST RESISTANT GLAZING SYSTEMS TO BLAST LOADING.” 2013. Masters Thesis, University of Kentucky. Accessed April 11, 2021. https://uknowledge.uky.edu/mng_etds/2.

MLA Handbook (7^th Edition):

Calnan, Joshua. “EXPERIMENTAL COMPARISON STUDY OF THE RESPONSE OF POLYCARBONATE AND LAMINATED GLASS BLAST RESISTANT GLAZING SYSTEMS TO BLAST LOADING.” 2013. Web. 11 Apr 2021.

Vancouver:

Calnan J. EXPERIMENTAL COMPARISON STUDY OF THE RESPONSE OF POLYCARBONATE AND LAMINATED GLASS BLAST RESISTANT GLAZING SYSTEMS TO BLAST LOADING. [Internet] [Masters thesis]. University of Kentucky; 2013. [cited 2021 Apr 11]. Available from: https://uknowledge.uky.edu/mng_etds/2.

Council of Science Editors:

Calnan J. EXPERIMENTAL COMPARISON STUDY OF THE RESPONSE OF POLYCARBONATE AND LAMINATED GLASS BLAST RESISTANT GLAZING SYSTEMS TO BLAST LOADING. [Masters Thesis]. University of Kentucky; 2013. Available from: https://uknowledge.uky.edu/mng_etds/2

Mississippi State University

26. Ehrgott, Jr., John Qua. INFLUENCE OF SOIL PROPERTIES ON THE ABOVEGROUND BLAST ENVIRONMENT FROM A NEAR-SURFACE DETONATION.

Degree: PhD, Civil and Environmental Engineering, 2010, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-09022010-083710/ ;

► Detonation of an explosive charge, such as a mine or an improvised explosive device (IED) at the ground surface or buried at shallow depth… (more)

▼ Detonation of an explosive charge, such as a mine or an improvised explosive device (IED) at the ground surface or buried at shallow depth in soil, can produce high airblast pressures and significant dynamic soil debris loads on an overlying or nearby structure, such as a vehicle passing over the explosive. The blast loading environment is a function of many factors including the explosive type, configuration, mass, and depth of burial, soil characteristics, and the distance between the ground surface and the structure or object. During the past several years, the US Army has focused considerable attention on developing improved methods for predicting this environment, particularly for use by vehicle/armor analysts, thereby, improving the survivability of these platforms. Research is needed to better understand the aboveground environment created by the detonation of a shallow-buried explosive in order to design adequate protective measures for an aboveground structure. Unfortunately, there is no accurate methodology for predicting these airblast and soil debris loads to support the designs. Development of the required prediction tools is hampered by lack of well controlled and documented experimental results for these complex loads. Without detailed experimental data, the numerical simulations of these loads cannot be adequately validated for the large deformation, stress, and motion gradients and the resulting interactions with structures. The focus of this research is to quantify the influence of soil properties on the aboveground environment from the detonation of a bare explosive charge resting on the soil surface or shallow-buried. In order to fully quantify the influence of soil parameters, well-controlled experiments were designed to directly measure soil debris and airblast loadings on an aboveground reaction structure due to the detonation of explosives at the surface of and shallow buried in three very different soils. The experiments were performed using specifications and strict quality controls that limited the influence of outside variables and ensured the experiments were repeatable. The experiments provided blast pressure, soil stress, and impulse data for each soil type. These data were analyzed to investigate the influence of the properties of the different soil types on the aboveground environment. Advisors/Committee Members: Philip M. Gullett (chair), Mark F. Horstemeyer (committee member), Donald Cargile (committee member), Stanley Woodson (committee member).

Subjects/Keywords: Airblast and Soil Debrie; Blast Loading; Shallow Buried Charge

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ehrgott, Jr., J. Q. (2010). INFLUENCE OF SOIL PROPERTIES ON THE ABOVEGROUND BLAST ENVIRONMENT FROM A NEAR-SURFACE DETONATION. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-09022010-083710/ ;

Chicago Manual of Style (16^th Edition):

Ehrgott, Jr., John Qua. “INFLUENCE OF SOIL PROPERTIES ON THE ABOVEGROUND BLAST ENVIRONMENT FROM A NEAR-SURFACE DETONATION.” 2010. Doctoral Dissertation, Mississippi State University. Accessed April 11, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-09022010-083710/ ;.

MLA Handbook (7^th Edition):

Ehrgott, Jr., John Qua. “INFLUENCE OF SOIL PROPERTIES ON THE ABOVEGROUND BLAST ENVIRONMENT FROM A NEAR-SURFACE DETONATION.” 2010. Web. 11 Apr 2021.

Vancouver:

Ehrgott, Jr. JQ. INFLUENCE OF SOIL PROPERTIES ON THE ABOVEGROUND BLAST ENVIRONMENT FROM A NEAR-SURFACE DETONATION. [Internet] [Doctoral dissertation]. Mississippi State University; 2010. [cited 2021 Apr 11]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-09022010-083710/ ;.

Council of Science Editors:

Ehrgott, Jr. JQ. INFLUENCE OF SOIL PROPERTIES ON THE ABOVEGROUND BLAST ENVIRONMENT FROM A NEAR-SURFACE DETONATION. [Doctoral Dissertation]. Mississippi State University; 2010. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-09022010-083710/ ;

University of Adelaide

27. Xu, Juechun. Blast analysis of normal concrete, high strength concrete and ultra-high performance concrete members.

Degree: 2016, University of Adelaide

URL: http://hdl.handle.net/2440/119514

► The understanding of different failure modes of reinforced concrete members is essential in the blast analysis and design of civil and defence structures. Normal concrete… (more)

▼ The understanding of different failure modes of reinforced concrete members is essential in the blast analysis and design of civil and defence structures. Normal concrete (NC) is a widely used material in structures; high strength concrete members (HSC) is undergoing widespread use in civil engineering and construction processes and ultra-high performance concrete (UHPC) is deemed to be a promising material due to its high ductility, impact resistance and energy absorption capacity and it has drawn intense interests for the purpose of blast resistant design of structures. This thesis contains five journal papers, which aim to extend, or produce new analytical techniques for investigating both shear and flexural failure modes of structural members made of these three kinds of materials by considering both experimental and theoretical studies. The thesis has been divided into three chapters. Chapter 1 is the introduction and problem statement of this research work. Chapter 2 contains two journal papers and it provides the absence of method for assessing direct shear failure mode of reinforced concrete (RC) members against blasts. Chapter 3 includes three journal papers, which present experimental and theoretical study of failure modes of high strength reinforced concrete (HSRC) members and ultra-high performance fibre reinforced concrete (UHPFRC) members under explosion loads. Finally, Chapter 4 presents conclusions of this research program. The experimental investigations on behaviour of reinforced concrete structures subjected to blast loading have revealed that direct shear mechanisms play an important role in the overall response and failure mode of structures. However, most of previous studies are based on the assumption that only flexural response dominates failure mode without taking shear failure into consideration. Therefore, the first journal paper in Chapter 2 is to use single degree of freedom (SDOF) system as a tool for predicting direct shear response of blast loaded reinforced concrete members. In addition, as there are no design provisions that are available to predict shear stress to slip relationship for design of NRC members, the second journal paper assesses direct shear response of NRC members is numerically evaluated using finite element software LS-DYNA, which has not been investigated in the previous literature. The two papers in Chapter 2 provide new insights concerning the mechanics of dynamic shear failure of NRC members against blast loading. Chapter 3 presents a blast testing program on ultra-high performance fibre reinforced concrete (UHPFRC) and high strength reinforced concrete (HSRC) columns and a one dimensional (1D) finite element model (FEM) is then adopted for further investigations, due to its inherent accuracy and stability despite its numerical efficiency. The third journal paper represented herein is devoted to investigating experimentally the mechanical properties and dynamic responses of ultra-high performance twisted steel fibre reinforced concrete and HSRC columns under both… Advisors/Committee Members: Wu, Chengqing (advisor), Ng, Ching-Tai (advisor), School of Civil, Environmental and Mining Engineering (school).

Subjects/Keywords: blast loading; direct shear; P-I diagram; reinforced concrete; shear transfet; ultra high performance fibre reinforced concrete; finite element

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Xu, J. (2016). Blast analysis of normal concrete, high strength concrete and ultra-high performance concrete members. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/119514

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Xu, Juechun. “Blast analysis of normal concrete, high strength concrete and ultra-high performance concrete members.” 2016. Thesis, University of Adelaide. Accessed April 11, 2021. http://hdl.handle.net/2440/119514.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Xu, Juechun. “Blast analysis of normal concrete, high strength concrete and ultra-high performance concrete members.” 2016. Web. 11 Apr 2021.

Vancouver:

Xu J. Blast analysis of normal concrete, high strength concrete and ultra-high performance concrete members. [Internet] [Thesis]. University of Adelaide; 2016. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2440/119514.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Xu J. Blast analysis of normal concrete, high strength concrete and ultra-high performance concrete members. [Thesis]. University of Adelaide; 2016. Available from: http://hdl.handle.net/2440/119514

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

28. Zhang, Fangrui. Dynamic analysis of steel confined concrete tubular columns against blast loads.

Degree: 2017, University of Adelaide

URL: http://hdl.handle.net/2440/104727

► The use of composite construction has drawn more and more attention in recent decades. This thesis contains a number of journal articles which aim to… (more)

▼ The use of composite construction has drawn more and more attention in recent decades. This thesis contains a number of journal articles which aim to enrich the knowledge of the performance of concrete filled tubular columns when subjected to blast loading. Experimental investigations are used in conjunction with numerical analysis to provide a thorough assessment of the blast-resistance of concrete filled tubular columns. The first chapter mainly focuses on the experimental study on concrete filled tubular columns under blast loading. A large-scale blast experimental program is carried out on concrete filled double-skin steel tube (CFDST) columns. The blast experiment aims to examine the blast-resistance of ten CFDST specimens, including five with square cross-section and the other five with circular cross-section. The parameters that are investigated during the blast experiment include: cross-sectional geometry, explosive charge weight and magnitude of axial load. After the experiment, several damaged test specimens are then transported back to the laboratory for residual axial load-carrying capacity tests. The proposed CFDST columns are able to retain more than 60% of its axial load-carrying capacity even after being subjected to close-range explosion. As blast experiments are often costly and associated with potential safety concerns, numerical tools have been adopted by more and more researchers. In the second chapter of the thesis, numerical approaches in modelling the dynamic behaviour of concrete filled steel tube (CFST) columns and CFDST columns under blast loading are presented. The numerical models are validated against the results of the blast experiment as described in the first chapter and good agreement is achieved. Parametric studies on the effect of column dimensions and material properties are also discussed through intensive numerical simulations. In the last chapter, a numerical method to generate pressure-impulse diagrams for CFDST columns is proposed which uses a damage criterion involving the residual axial load-carrying capacity. Based on the numerical method, pressure-impulse diagrams for different column configurations are derived and analytical expressions of deriving pressure-impulse diagrams for CFDST columns are also developed through regression analysis. Advisors/Committee Members: Bennet, Terry (advisor), Zhao, Xiao-Ling (advisor), Wu, Chengqing (advisor), School of Civil, Environmental and Mining Engineering (school).

Subjects/Keywords: CFDST; UHPC; blast loading; Research by Publication

…infilled with UHPC under close-range blast loading. International Journal of Impact Engineering… …of CFDST columns infilled with UHPFRC after close-range blast loading. Thin-Walled… …columns under blast loading. Journal of Performance of Constructed Facilities, 29, B4015002… …Numerical simulation of concrete filled steel tube columns against BLAST loads. Thin-Walled… …Experimental and numerical study of blast resistance of square CFDST columns with steel-fibre…

1 more image…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhang, F. (2017). Dynamic analysis of steel confined concrete tubular columns against blast loads. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/104727

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhang, Fangrui. “Dynamic analysis of steel confined concrete tubular columns against blast loads.” 2017. Thesis, University of Adelaide. Accessed April 11, 2021. http://hdl.handle.net/2440/104727.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhang, Fangrui. “Dynamic analysis of steel confined concrete tubular columns against blast loads.” 2017. Web. 11 Apr 2021.

Vancouver:

Zhang F. Dynamic analysis of steel confined concrete tubular columns against blast loads. [Internet] [Thesis]. University of Adelaide; 2017. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2440/104727.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhang F. Dynamic analysis of steel confined concrete tubular columns against blast loads. [Thesis]. University of Adelaide; 2017. Available from: http://hdl.handle.net/2440/104727

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Colorado

29. Hansen, Curt Benjamin. Buried Explosive-Induced Blast Characterization by Geotechnical Centrifuge Modeling.

Degree: PhD, Mechanical Engineering, 2016, University of Colorado

URL: https://scholar.colorado.edu/mcen_gradetds/146

► A comprehensive experimental regime was conducted to advance the understanding of the mechanistic phenomena of buried, explosive-induced soil responses using geotechnical centrifuge modeling. To… (more)

▼ A comprehensive experimental regime was conducted to advance the understanding of the mechanistic phenomena of buried, explosive-induced soil responses using geotechnical centrifuge modeling. To address experimental gaps in the current literature, this research documents the high-rate dynamic soil behavior under explosive loads with parametric variations of charge size, burial depth, and g-level in conjunction with post-detonation static measurement of blast-excavated craters. The novel integration of a high-speed imaging system into the centrifuge domain, placed in close-proximity to the blast, enabled a rigorous in-flight characterization of the transient, multiphasic soil blast mechanics including initial soil deformation, early soil disaggregation, gas-particle interactions, and soil dome evolution. The results indicate that initial soil surface motions appear progressively later, post-detonation, with elevated acceleration. Furthermore, the data demonstrates that gravity-induced confining stresses reduce the temporal and spatial soil disaggregation flow kinematics. Crater dimensions, measured by a laser profilometer, exhibit a gravity-dependent decrease and a new, dimensionless coupling function correlates the physical ejecta dynamics to the crater dimensional statics evident in the buried blast phenomena. Piezoelectric sensors, embedded coincident to the test-specified burial depth and recorded simultaneous to soil ejecta kinematics, measure ground shock transmissivity as a function of radial distance from the charge, with parametric variations in explosive mass and in-situ soil conditions. This research also developed a computational model of the buried, blast event in a dry soil medium within an advanced, 3-dimensional, multi-material, arbitrary Lagrangian-Eulerian (ALE) framework and implemented in an explicit finite element solver. The empirically-determined soil ejecta velocities and crater dimensions demonstrate reasonable correspondence to the numerical model. Significantly, the ground shock peak accelerations and stresses data exhibit close agreement to the numerical predictions. An in-depth analysis compares this study’s empirical scaling relationships, in both dimensional and dimensionless form to a compilation of past field and centrifuge results and demonstrates their favorable correlation to full-scale explosive events. The parametric study of soil ejecta kinematics and crater morphology progressed to an in-depth investigation of buried, explosive-induced kinetic energy transfer to an overlying target. To address experimental gaps in the current literature, this research documents the near-field resultant force impacts and rigid-body dynamics under explosive loads, instead of the conventional discrete measurement methods, with parametric variations of target height, explosive mass, burial depth, g-level, target geometries, and in-situ soil conditions. The design and fabrication of a novel, laboratory-scale blast impact device, the Blast Impact Response Gage (BIRG), integrated… Advisors/Committee Members: Ronald Y.S. Pak, Richard Regueiro, Mark Rentschler, Rong Long, Jeffrey Knutsen.

Subjects/Keywords: buried blast loading; centrifuge modeling; crater morphology; high-explosives; impulse; soil ejecta rheology; Civil Engineering; Mechanical Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hansen, C. B. (2016). Buried Explosive-Induced Blast Characterization by Geotechnical Centrifuge Modeling. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/mcen_gradetds/146

Chicago Manual of Style (16^th Edition):

Hansen, Curt Benjamin. “Buried Explosive-Induced Blast Characterization by Geotechnical Centrifuge Modeling.” 2016. Doctoral Dissertation, University of Colorado. Accessed April 11, 2021. https://scholar.colorado.edu/mcen_gradetds/146.

MLA Handbook (7^th Edition):

Hansen, Curt Benjamin. “Buried Explosive-Induced Blast Characterization by Geotechnical Centrifuge Modeling.” 2016. Web. 11 Apr 2021.

Vancouver:

Hansen CB. Buried Explosive-Induced Blast Characterization by Geotechnical Centrifuge Modeling. [Internet] [Doctoral dissertation]. University of Colorado; 2016. [cited 2021 Apr 11]. Available from: https://scholar.colorado.edu/mcen_gradetds/146.

Council of Science Editors:

Hansen CB. Buried Explosive-Induced Blast Characterization by Geotechnical Centrifuge Modeling. [Doctoral Dissertation]. University of Colorado; 2016. Available from: https://scholar.colorado.edu/mcen_gradetds/146

KTH

30. Kamali, Abbas Zangeneh. Shear Strength of Reinforced Concrete Beams subjected to Blast Loading : Non-linear Dynamic Analysis.

Degree: Structural Engineering and Bridges, 2012, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104241

► The experimental investigations performed on the behaviour of reinforce concrete elements subjected to blast loading have revealed that the shear mechanisms and ductility play… (more)

▼ The experimental investigations performed on the behaviour of reinforce concrete elements subjected to blast loading have revealed that the shear mechanisms and ductility play important roles in the overall response and failure mode of such structures. The main aim of this master thesis is to study the possibility of using finite element method as a tool for predicting the dynamic response of blast loaded reinforced concrete beams and evaluation of their shear strength. In this study, the commercial software, ABAQUS/Explicit has been used by implementing appropriate constitutive material models in order to consider the material nonlinearity, stiffness degradation and strain rate effects. The results of some blast loaded tested beams have been used for verification and calibration of the model. As a secondary objective, the calibrated model used to study the influence of some important factors on the shear strength of reinforced concrete beams and investigate their effects on the failure mode. The results used as a reference and compared with the calculations according to some design codes for blast resistance design. The results of the present research show that the implemented nonlinear finite element model successfully simulates the dynamic responses including displacement/reaction force time histories and induced damage patterns of blast tested beams with reasonable accuracy. The results of performed parametric study confirm that the ductility play important role in the failure behaviour of studied beams. The numerical simulations show that dynamic response of a soft element is more ductile than the stiffer one and the shear forces are thereby limited. Thus, although a soft element fails by large deformations in flexure, a stiff element may experience a brittle shear failure mode for the same load intensity. The comparison between the results of numerical analysis and design codes calculation show that the American approach in shear design of reinforced concrete elements subjected to blast loading is relatively conservative, similar to static design approach and do not consider the effect of ductility in the shear design procedure. On the contrary, the procedure that Swedish guideline implemented somehow considers the effect of ductility on the shear strength of reinforced concrete elements subjected to impulsive loads. Further research should involve the using the developed finite element model as a tool in order to theoretically study the dynamic response of blast loaded reinforced concrete elements and their failure modes. The results of numerical simulations can be used as a reference to derive simplified computational methods for practical design purposes.

Subjects/Keywords: Non-linear finite element analysis; Shear Strength; Reinforced Concrete; Normal Strength Concrete; Blast loading; Explicit Dynamic analysis; Design codes

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kamali, A. Z. (2012). Shear Strength of Reinforced Concrete Beams subjected to Blast Loading : Non-linear Dynamic Analysis. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104241

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kamali, Abbas Zangeneh. “Shear Strength of Reinforced Concrete Beams subjected to Blast Loading : Non-linear Dynamic Analysis.” 2012. Thesis, KTH. Accessed April 11, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104241.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kamali, Abbas Zangeneh. “Shear Strength of Reinforced Concrete Beams subjected to Blast Loading : Non-linear Dynamic Analysis.” 2012. Web. 11 Apr 2021.

Vancouver:

Kamali AZ. Shear Strength of Reinforced Concrete Beams subjected to Blast Loading : Non-linear Dynamic Analysis. [Internet] [Thesis]. KTH; 2012. [cited 2021 Apr 11]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104241.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kamali AZ. Shear Strength of Reinforced Concrete Beams subjected to Blast Loading : Non-linear Dynamic Analysis. [Thesis]. KTH; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104241

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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Open Access Theses and Dissertations