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University of Illinois – Urbana-Champaign
1.
Chen, Zhe.
Mechanistic analysis of concrete crosstie and fastening system using field-validated finite element model.
Degree: PhD, Civil Engineering, 2015, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/78441 
► The objective of this dissertation is to further investigate the performance of concrete crosstie and fastening system under vertical and lateral wheel load using finite…
(more)
▼ The objective of this dissertation is to further investigate the performance of concrete crosstie and fastening system under vertical and lateral wheel load using finite element analysis, and explore possible improvement for current track design standard. The damage of fastening system is one of the most prevalent failure causes for concrete crosstie track, however the current AREMA design standard only includes evaluative tests for the fastening system, rather than a mechanistic design approach. To improve the current design approach, the vertical and lateral load path through the track structure and the component demand within the concrete crosstie and fastening system should be further investigated. In addition, to facilitate the application of the knowledge related to the load path through the concrete crosstie and fastening system, mechanistic models should be developed so that engineers could easily estimate the distribution of wheel load. The research work presented in this dissertation includes the following tasks: 1) developing a detailed finite element model of the prestressed concrete crosstie and fastening system based on the manufacturer’s design, 2) validating the component models of the rail clip and the prestressed concrete crosstie based on manufacturer’s information and crosstie flexural test, 3) validating the single-crosstie-fastening-system model based on laboratory experimentation, 4) validating the multiple crosstie model based on the field experimentation conducted on instrumented track, 5) validating the multiple crosstie model based on full-scale laboratory experimentation under asymmetric loading scenarios, 6) using the validated FE model to conduct parametric studies about the failure mechanisms of the concrete crosstie and fastening system, and the effect of critical design parameters on the performance of the track structure, 7) developing a mechanistic model to estimate the distribution of lateral wheel load and the rail head lateral deflection based on the design of the track structure and the loading scenario, and 8) using the proposed mechanistic model to develop a simplified design tool based on Microsoft Excel so that railroad track engineers can use the mechanistic model to efficiently determine the track response. Based on the model validation at different levels, it is proven that the detailed finite element model is able to capture some critical mechanisms of the track structure including the rotation of the rail, the response of the fastening system, the distribution of wheel loads and the flexure of concrete crosstie. In addition, the field validation of the finite element model and the parametric studies provide some valuable insights on the load path and performance of the continuous track structure.
Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Andrawes%2C%20Bassem%22%29&pagesize-30">Andrawes, Bassem (advisor),
Champaign%22%20%2Bcontributor%3A%28%22Andrawes%2C%20Bassem%22%29&pagesize-30">Andrawes, Bassem (Committee Chair),
Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A.%22%29&pagesize-30">Kuchma, Daniel A. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Cha%2C%20Eun%20Jeong%22%29&pagesize-30">Cha, Eun Jeong (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Lange%2C%20David%20A.%22%29&pagesize-30">Lange, David A. (committee member).
Subjects/Keywords: finite element analysis; concrete crosstie; fastening system
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APA (6th Edition):
Chen, Z. (2015). Mechanistic analysis of concrete crosstie and fastening system using field-validated finite element model. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/78441
Chicago Manual of Style (16th Edition):
Chen, Zhe. “Mechanistic analysis of concrete crosstie and fastening system using field-validated finite element model.” 2015. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 11, 2021.
http://hdl.handle.net/2142/78441.
MLA Handbook (7th Edition):
Chen, Zhe. “Mechanistic analysis of concrete crosstie and fastening system using field-validated finite element model.” 2015. Web. 11 Apr 2021.
Vancouver:
Chen Z. Mechanistic analysis of concrete crosstie and fastening system using field-validated finite element model. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2015. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2142/78441.
Council of Science Editors:
Chen Z. Mechanistic analysis of concrete crosstie and fastening system using field-validated finite element model. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/78441
University of Illinois – Urbana-Champaign
2.
Foltz, Raymond.
Structural behavior and modeling of high-performance fiber-reinforced cementitious composites for earthquake-resistant design.
Degree: PhD, 0106, 2012, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/29650
► For earthquake-resistant design, adequate concrete confinement is vital for a ductile structural response and for providing a stable energy dissipating mechanism. Since concrete materials generally…
(more)
▼ For earthquake-resistant design, adequate concrete confinement is vital for a ductile structural response and for providing a stable energy dissipating mechanism. Since concrete materials generally exhibit quasi-brittle failure and a low tensile strength, designers of traditional reinforced concrete often specify extensive transverse reinforcement with thorough detailing to ensure that appropriate confinement to the concrete and the longitudinal reinforcing bars is provided. This approach often results in such a large amount of reinforcing steel that construction of the design can be congested, costly, and even impractical. This effect is particularly pronounced in critical shear and/or moment regions of structural concrete coupling beams and pile-wharf connections, as well as in plastic hinge regions of reinforced concrete beams, columns, and structural walls. To address this problem, the development and modeling of High Performance Fiber-Reinforced Cementitious Composites (HPFRCC) for use in key shear and/or moment regions of damage-critical structural concrete elements has been investigated.
An experimental program was conducted to further understand the behavior of HPFRCC under general multi-axial stress states, such as would be expected at various key locations in a damage-critical structural component. Concrete plate specimens comprising mixes containing from one to two percent volume fraction of hooked steel fibers and Spectra (polyethylene) fibers were tested. After exploration of these different fiber types and volume fractions, a 1.5% volume fraction of hooked steel fibers was selected as the concrete mix for more comprehensive examination, based in part on a study to create self-consolidating fiber-reinforced concrete. The stress-strain behavior of the various HPFRCC mixes was examined, and biaxial failure envelopes have been developed. The plate specimen tests showed that HPFRCC exhibits a confined compressive behavior with a significantly increased damage tolerance and deformation capacity.
Using the knowledge and behavioral trends gained from the laboratory tests of HPFRCC materials, it was possible to create a phenomenological HPFRCC finite element material model, with a smeared crack representation, that was calibrated to the experimental data. In addition to small-scale structural / material testing and modeling, the same HPFRCC hooked steel fiber mix was tested in large-scale coupling beam component tests by project partners at the
University of Michigan. After completion of these large-scale tests, the material model was validated at the structural component level with their experimental coupling beam results.
Finally, a full-scale structural concrete pile-wharf connection was tested at the
University of
Illinois, and the behavior of this damage-critical component was thoroughly analyzed. The HPFRCC model was then implemented into the pile-wharf connection application. Overall, it was found that the increase in structural component damage tolerance through a ductile response…
Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22LaFave%2C%20James%20M.%22%29&pagesize-30">LaFave, James M. (advisor),
Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A.%22%29&pagesize-30">Kuchma, Daniel A. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Roesler%2C%20Jeffery%20R.%22%29&pagesize-30">Roesler, Jeffery R. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Gamble%2C%20William%20L.%22%29&pagesize-30">Gamble, William L. (committee member).
Subjects/Keywords: High-Performance Fiber-Reinforced Cementitious Composites (HPFRCC); High-Performance Fiber-Reinforced Concrete; Biaxial HPFRCC Strength; Pile-Wharf Connection Test; HPFRCC Modeling
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APA (6th Edition):
Foltz, R. (2012). Structural behavior and modeling of high-performance fiber-reinforced cementitious composites for earthquake-resistant design. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/29650
Chicago Manual of Style (16th Edition):
Foltz, Raymond. “Structural behavior and modeling of high-performance fiber-reinforced cementitious composites for earthquake-resistant design.” 2012. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 11, 2021.
http://hdl.handle.net/2142/29650.
MLA Handbook (7th Edition):
Foltz, Raymond. “Structural behavior and modeling of high-performance fiber-reinforced cementitious composites for earthquake-resistant design.” 2012. Web. 11 Apr 2021.
Vancouver:
Foltz R. Structural behavior and modeling of high-performance fiber-reinforced cementitious composites for earthquake-resistant design. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2012. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2142/29650.
Council of Science Editors:
Foltz R. Structural behavior and modeling of high-performance fiber-reinforced cementitious composites for earthquake-resistant design. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/29650
University of Illinois – Urbana-Champaign
3.
Borello, Daniel J.
Behavior and large-scale experimental testing of Steel Plate Shear Walls with Coupling.
Degree: PhD, 0106, 2014, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/49499
► The Steel Plate Shear Wall with Coupling (SPSW-WC) configuration is an extension of the conventional Steel Plate Shear Wall (SPSW) seismic lateral force resisting system.…
(more)
▼ The Steel Plate Shear Wall with Coupling (SPSW-WC) configuration is an extension of the conventional Steel Plate Shear Wall (SPSW) seismic lateral force resisting system. The SPSW system is composed of a steel frame with web plates between the beams and columns. In North America, the web plates of the SPSW are typically slender and unstiffened and dissipate energy through yielding of a diagonal tension field.
Architectural constraints often encourage the designer to place a pair of conventional SPSWs adjacently. The SPSW-WC configuration consists of linking a pair of SPSW piers together with coupling beams at the floor level. The SPSW-WC configuration retains many of the benefits of the SPSW system, such as high initial stiffness, good ductility, and the ability to dissipate a large amount of energy, while introducing another form of energy dissipation. Additionally, the SPSW-WC system achieves greater material efficiency than a pair of conventional SPSWs.
However, limited research is available on the SPSW-WC configuration. Therefore, the purpose of this work is to present a comprehensive study of the SPSW-WC configuration as a seismic lateral force resisting system in high seismic regions. The conventional SPSW design procedure was extended for the SPSW-WC configuration. The design procedure was used to develop a suite of prototype structures. The fundamental response of the SPSW-WC configuration was explored through a mechanism analysis. Closed-form analytical expressions were derived based on the geometry and member sizes of a SPSW-WC frame for the ultimate strength and the degree of coupling, a parameter related to the proportion of the applied moment resisted by a vertical axial force couple in the piers. The prototype structures were analyzed using time history analysis under different levels of ground shaking. The performance of the SPSW-WC was compared with the conventional SPSW system.
An experimental test program was developed to explore the response of the SPSW-WC with realistic fabrication techniques. Two half-scale specimens were constructed to represent the bottom three stories of two six-story prototype structures. The degree of coupling and the characteristic inelastic behavior in the coupling beams were the primary parameters that differentiated the two specimens. The specimens were subjected to a cyclic displacement protocol, with mixed-mode hybrid control algorithms used to emulate the demands on bottom three stories of a six-story structure.
The experimental SPSW-WC specimens demonstrated robust cyclic performance that was consistent with the design intent. Both specimens reached 4% lateral drift, the maximum displacement that could be imposed by the facility, with minimal strength degradation. Additionally, a large amount of energy was dissipated during each test, with over 20% equivalent viscous damping observed in the 4% drift cycles. The web plates, horizontal boundary elements, and coupling beams all exhibited ductile response through large inelastic deformations.
…
Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Fahnestock%2C%20Larry%20A.%22%29&pagesize-30">Fahnestock, Larry A. (advisor),
Champaign%22%20%2Bcontributor%3A%28%22Fahnestock%2C%20Larry%20A.%22%29&pagesize-30">Fahnestock, Larry A. (Committee Chair),
Champaign%22%20%2Bcontributor%3A%28%22Berman%2C%20Jeffrey%20W.%22%29&pagesize-30">Berman, Jeffrey W. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A.%22%29&pagesize-30">Kuchma, Daniel A. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22LaFave%2C%20James%20M.%22%29&pagesize-30">LaFave, James M. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Spencer%2C%20Billie%20F.%2C%20Jr.%22%29&pagesize-30">Spencer, Billie F., Jr. (committee member).
Subjects/Keywords: Structural Engineering; Seismic Design; Earthquake Engineering; Steel Structures; Coupled Walls; Steel Plate Shear Walls; Dynamic Analysis; Experimental Testing
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APA ·
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APA (6th Edition):
Borello, D. J. (2014). Behavior and large-scale experimental testing of Steel Plate Shear Walls with Coupling. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/49499
Chicago Manual of Style (16th Edition):
Borello, Daniel J. “Behavior and large-scale experimental testing of Steel Plate Shear Walls with Coupling.” 2014. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 11, 2021.
http://hdl.handle.net/2142/49499.
MLA Handbook (7th Edition):
Borello, Daniel J. “Behavior and large-scale experimental testing of Steel Plate Shear Walls with Coupling.” 2014. Web. 11 Apr 2021.
Vancouver:
Borello DJ. Behavior and large-scale experimental testing of Steel Plate Shear Walls with Coupling. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2014. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2142/49499.
Council of Science Editors:
Borello DJ. Behavior and large-scale experimental testing of Steel Plate Shear Walls with Coupling. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2014. Available from: http://hdl.handle.net/2142/49499
University of Illinois – Urbana-Champaign
4.
Abdelnaby, Adel.
Multiple earthquake effects on degrading reinforced concrete structures.
Degree: PhD, 0106, 2012, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/34345
► Multiple earthquakes occur at many regions around the world where complex fault systems exist. These fault systems usually do not relieve all accumulated strains at…
(more)
▼ Multiple earthquakes occur at many regions around the world where complex fault systems exist. These fault systems usually do not relieve all accumulated strains at once when the first rupture takes place. Therefore high stresses form at different locations causing sequential ruptures until the fault system is completely stabilized. The sequential ruptures along the fault segment(s) lead to multiple earthquakes which are often hard to distinguish them as fore-, main- and after-shocks, or a sequence of earthquakes from proximate fault segments.
Field investigations reported failure of structural systems under repeated earthquakes, especially where structural retrofitting was not provided due to the short time frames between the successive shaking. In most failure cases the reported damage is mainly due to dramatic loss of stiffness and strength of structural elements as a result of material deterioration under repeated earthquake loadings. Deterioration effects are obvious in structures that experienced main-shock aftershock earthquake sequence and were able to withstand the main-shock however they collapsed in the smaller aftershock.
Limited research has addressed the seismic behavior of structures subjected to multiple earthquakes. Repeated shaking induces accumulated damage to structures that affects their level of stiffness and strength and hence their response. Given the complexity of depicting the degrading behavior of structures using the current numerical tools, previous researchers used simplified approaches to compensate for the absence of important numerical model features of stiffness and strength degradation, alongside pinching of load-displacement loops. Moreover ground motion sequences used in previous studies were randomized and hence the characteristics of ground motions effects on the response were not accurately accounted for. Findings from previous research indicated that repeated shaking has a minimal effect on the response of structures in terms of peak displacements, maximum base shear and period elongation and hence it can be neglected for seismic evaluation of structures if the most damaging earthquake is to be considered.
This research re-investigates the behavior of reinforced concrete frame systems under multiple earthquakes. The aforementioned damage features are modeled on the material level by using a plastic energy-based degrading concrete model and a steel model that considers reinforcing bars deterioration under large cyclic amplitude plastic excursions. Structural models of reinforced concrete degrading systems are subjected to selected earthquake sequence scenarios. Ground motion characteristics of individual records within the sequence, such as peak ground accelerations, predominant periods, and durations as well as the order of records application in the sequence, are parameterized and their effect on the response is monitored. Finally the effect of multiple earthquakes on current design guidelines is investigated and modifications are proposed accordingly. The case for…
Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Elnashai%2C%20Amr%20S.%22%29&pagesize-30">Elnashai, Amr S. (advisor),
Champaign%22%20%2Bcontributor%3A%28%22Elnashai%2C%20Amr%20S.%22%29&pagesize-30">Elnashai, Amr S. (Committee Chair),
Champaign%22%20%2Bcontributor%3A%28%22Spencer%2C%20Billie%20F.%2C%20Jr.%22%29&pagesize-30">Spencer, Billie F., Jr. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A.%22%29&pagesize-30">Kuchma, Daniel A. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Mondal%2C%20Paramita%22%29&pagesize-30">Mondal, Paramita (committee member).
Subjects/Keywords: Multiple Earthquakes; Damage Accumulation; Degrading Structures
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APA ·
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APA (6th Edition):
Abdelnaby, A. (2012). Multiple earthquake effects on degrading reinforced concrete structures. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/34345
Chicago Manual of Style (16th Edition):
Abdelnaby, Adel. “Multiple earthquake effects on degrading reinforced concrete structures.” 2012. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 11, 2021.
http://hdl.handle.net/2142/34345.
MLA Handbook (7th Edition):
Abdelnaby, Adel. “Multiple earthquake effects on degrading reinforced concrete structures.” 2012. Web. 11 Apr 2021.
Vancouver:
Abdelnaby A. Multiple earthquake effects on degrading reinforced concrete structures. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2012. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2142/34345.
Council of Science Editors:
Abdelnaby A. Multiple earthquake effects on degrading reinforced concrete structures. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/34345
5.
Behrouzi, Anahid A.
Impact of cross section, web reinforcement and load history on the seismic performance of slender concrete walls.
Degree: PhD, Civil Engineering, 2016, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/95368
► Many reinforced concrete buildings in seismic regions employ reinforced concrete shear walls as part of the lateral force resisting system and these walls often have…
(more)
▼ Many reinforced concrete buildings in seismic regions employ reinforced concrete shear walls as part of the lateral force resisting system and these walls often have non-planar cross-sectional geometries. To date, the majority of experimental tests on slender concrete walls have been conducted on planar walls which have been subject to low shear stress demands. An experimental program was developed to examine the response of flanged C-shaped walls with respect of load history and a computational parametric study was conducted to focus more specifically on the impact of web reinforcement for walls subject to a range of shear stress demands.
The experimental program investigated the impact of bi-directional loading on flanged C-shaped walls that were designed to meet the minimum ACI 318-08 special structural wall requirements. The results indicate that irrespective of load history the C-shaped walls have a similar damage progression leading to a buckling-rupture failure and a nearly identical strong-axis load-deformation response up to the peak flexural strength. However, bi-directionally loaded walls exhibit earlier onset of critical damage limit states and reduced strong-axis drift capacity. Compared to experimentally-tested planar walls that tend to fail via crushing-buckling, the flanged C-shaped wall geometry has a more ductile failure mode despite being subject to higher shear stress demands. The improved response can be attributed to the ability to redistribute forces to the boundary elements and flanges after considerable web damage.
Damage to the unconfined web of the flanged C-shaped walls was substantial. Though walls developed distributed cracking, there was a single wide crack plane that developed near the wall base. Widening of this crack led to high tensile strains in web reinforcement and ultimately the widespread fracture of vertical web bars, limited fracture of horizontal web bars, as well as severe concrete degradation in the surrounding region. This performance suggests that the minimum web steel content required by ACI 318 may be insufficient. As such, the current minimum web reinforcement requirements were studied using an experimentally-validated, high-resolution finite element modelling approach.
The computational parametric study examined the impact of the shear stress demand and web reinforcement ratio on wall deformation and ductility. The study results indicate that increased shear stress demand can significantly reduce wall deformation and ductility; however, designs with excess horizontal reinforcement, beyond what is required by ACI 318-14 to meet shear demand, can improve ductility. The data suggest there are similar performance benefits of reducing the design shear demand-to-capacity ratio. A second stage of the parametric study explored the combined effect of modifying the horizontal reinforcement ratio and increasing boundary element length from the ACI 318-14 minimum to the full neutral axis depth. For walls with low-moderate shear stress demands, this combination results in…
Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A%22%29&pagesize-30">
Kuchma,
Daniel A (advisor),
Champaign%22%20%2Bcontributor%3A%28%22Spencer%2C%20Bill%20F%22%29&pagesize-30">Spencer, Bill F (Committee Chair),
Champaign%22%20%2Bcontributor%3A%28%22Lehman%2C%20Dawn%20E%22%29&pagesize-30">Lehman, Dawn E (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Abrams%2C%20Daniel%20P%22%29&pagesize-30">Abrams, Daniel P (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Popovics%2C%20John%20S%22%29&pagesize-30">Popovics, John S (committee member).
Subjects/Keywords: Reinforced Concrete Walls; Structural Walls; Flanged Walls; Bi-directional Loading; Web Reinforcement
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APA ·
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MLA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Behrouzi, A. A. (2016). Impact of cross section, web reinforcement and load history on the seismic performance of slender concrete walls. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/95368
Chicago Manual of Style (16th Edition):
Behrouzi, Anahid A. “Impact of cross section, web reinforcement and load history on the seismic performance of slender concrete walls.” 2016. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 11, 2021.
http://hdl.handle.net/2142/95368.
MLA Handbook (7th Edition):
Behrouzi, Anahid A. “Impact of cross section, web reinforcement and load history on the seismic performance of slender concrete walls.” 2016. Web. 11 Apr 2021.
Vancouver:
Behrouzi AA. Impact of cross section, web reinforcement and load history on the seismic performance of slender concrete walls. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2016. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2142/95368.
Council of Science Editors:
Behrouzi AA. Impact of cross section, web reinforcement and load history on the seismic performance of slender concrete walls. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2016. Available from: http://hdl.handle.net/2142/95368
University of Illinois – Urbana-Champaign
6.
Wei, Sihang.
Determination of load path through concrete crosstie and fastening system: a laboratory and field investigation.
Degree: PhD, Civil Engineering, 2017, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/97369
► US railways move more freight (measured in tonne-kms) by rail than by any other means. This is done over an extensive network of primarily private…
(more)
▼ US railways move more freight (measured in tonne-kms) by rail than by any other means. This is done over an extensive network of primarily private freight railway lines that also transport passenger trains. To enable the expansion of high-speed passenger rail service using shared passenger/freight infrastructure, the US Department of Transportation Federal Railroad Administration (FRA) sponsored a research project to investigate infrastructure design and performance challenges. This is a multi-faceted research project for which one element is laboratory and field investigation of the load path from rail-wheel to precast concrete crossties.
In this research, the behavior of crosstie and fastening system is investigated through material-level, component-level and system-level laboratory and field experiments. The system-level experiments use three primary test setups. One of these setups, referred to as a static single-crosstie and fastening system experiment, enables the application of a downward and outward lateral force from the contact point of an idealize wheel through to the crosstie. Displacements and strains from each component were collected to understand the load path under simplified loading conditions. In addition to examining the factors that influence the flow of forces, a key objective of this work was to calibrate a means of displacement and strain measurements for use in rail corridors to determine the flow of forces from wheels through to crossties.
The second test setup uses the full-scale Track Loading System (TLS) to conduct similar tests and measurements over a multi-crosstie system in laboratory. A 22-feet long section of track including eleven concrete crossties that was loaded by vertical and lateral actuators over a 32-inch wheel set with varying ratios of lateral to vertical force from the wheel to rail.
The third test setup is the full-scale field experiment performed at the Transportation Technology Center (TTC) in Pueblo, CO. Five adjacent crossties in tangent and curved track were instrumented and loaded by Track Loading Vehicle (TLV) with static wheel loads. Dynamic tests were conducted with passenger and freight train consists at various speeds. Measurements including the wheel-rail interaction forces, rail seat vertical reactions, shoulder lateral reactions, and component strain and displacements.
The data collected from the three system-level experiments was used to clarify the load path, target areas of uncertainty, investigate the behavior of each component under extreme static loading and cyclical dynamic loading, as well as calibrate and validate a 3-D finite element model being developed at UIUC. In addition, this research offers suggestions for the instrumentation, testing, data-analysis and current design recommendations of concrete crosstie and fastening systems.
Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20%20A%22%29&pagesize-30">
Kuchma,
Daniel A (advisor),
Champaign%22%20%2Bcontributor%3A%28%22Lange%2C%20David%20A%22%29&pagesize-30">Lange, David A (Committee Chair),
Champaign%22%20%2Bcontributor%3A%28%22Spencer%2C%20Billie%20F%22%29&pagesize-30">Spencer, Billie F (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Andrawes%2C%20Bassem%20O%22%29&pagesize-30">Andrawes, Bassem O (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Edwards%2C%20John%20Riley%22%29&pagesize-30">Edwards, John Riley (committee member).
Subjects/Keywords: Railroad; Concrete crosstie; Fastening system; Load path; Experiment; Finite element analysis; Static; Dynamic
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APA (6th Edition):
Wei, S. (2017). Determination of load path through concrete crosstie and fastening system: a laboratory and field investigation. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/97369
Chicago Manual of Style (16th Edition):
Wei, Sihang. “Determination of load path through concrete crosstie and fastening system: a laboratory and field investigation.” 2017. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 11, 2021.
http://hdl.handle.net/2142/97369.
MLA Handbook (7th Edition):
Wei, Sihang. “Determination of load path through concrete crosstie and fastening system: a laboratory and field investigation.” 2017. Web. 11 Apr 2021.
Vancouver:
Wei S. Determination of load path through concrete crosstie and fastening system: a laboratory and field investigation. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2017. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2142/97369.
Council of Science Editors:
Wei S. Determination of load path through concrete crosstie and fastening system: a laboratory and field investigation. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2017. Available from: http://hdl.handle.net/2142/97369
University of Illinois – Urbana-Champaign
7.
Mahmoud, Hussam N.
Seismic behavior of semi-rigid steel frames.
Degree: PhD, 0106, 2011, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/26164
► The widespread and unexpected damage to welded connections during recent earthquakes led to the investigation of alternatives for the construction of steel frames in seismic…
(more)
▼ The widespread and unexpected damage to welded connections during recent earthquakes led to the investigation of alternatives for the construction of steel frames in seismic areas. Bolted semi-rigid connections have been recognized as an attractive alternative to welded connections. However, existing knowledge on the behavior of the connection is either from testing of beam-to-column subassemblies under idealized load and boundary conditions, or from analytical studies. In addition, the system-level experimental behavior of semi-rigidly connected frames using real earthquake motions to conclusively verify the full potential of semi-rigidity (implying also partial-strength) in earthquake resistance application is lacking. To this end, an advanced hybrid simulation approach for the seismic assessment of steel frames with semi-rigid connections was proposed and successfully completed. Furthermore, nonlinear dynamic response-history analyses of semi-rigid frames with varying design parameters were conducted to evaluate the system performance under seismic events. The results of the hybrid simulation and the parametric studies are used to quantify various fundamental code parameters needed for the seismic design of structures.
The hybrid simulation included the most reliable, realistic, and computationally efficient experimental and analytical modules, which were developed and successfully integrated in a closed-loop system-level simulation. Three hybrid simulations were conducted on three different partial-strength semi-rigid frames with connection capacities that are a percentage of the plastic moment capacity of the beam (70% Mpbeam, 50% Mpbeam, and 30% Mpbeam). The simulations utilized the large-scale Multi-Axial Full-Scale Sub-Structured Testing and Simulation (MUST-SIM) facility at the
University of
Illinois and included a full-scale physical specimen for the experimental module and a 2D finite element model for the analytical module. The experimental component consisted of a beam-column subassembly with top-and seat-angle with double web-angle connecting the beam to the column. The analytical component is an inelastic finite element model with the connections modeled using a refined 2D continuum elements that is capable of capturing all relevant deformation and inelastic features of the connection.
In addition to the hybrid simulation, nonlinear dynamic response-history analyses were conducted, on frames with three different connection capacities (70% Mpbeam, 50% Mpbeam, and 30% Mpbeam), using a collection of ground motion records scaled to the maximum considered earthquake (MCE). The analyses were aimed at investigating the effect of varying different design parameters on the seismic response and period elongation of the frames. The design parameters, in addition to connection strength, included yield strength of the angle material, coefficient of friction between faying surfaces, and the amount of slip allowed in the connection.
The results of the hybrid simulation along with the analytical studies were used…
Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Elnashai%2C%20Amr%20S.%22%29&pagesize-30">Elnashai, Amr S. (advisor),
Champaign%22%20%2Bcontributor%3A%28%22Elnashai%2C%20Amr%20S.%22%29&pagesize-30">Elnashai, Amr S. (Committee Chair),
Champaign%22%20%2Bcontributor%3A%28%22Spencer%2C%20Billie%20F.%2C%20Jr.%22%29&pagesize-30">Spencer, Billie F., Jr. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A.%22%29&pagesize-30">Kuchma, Daniel A. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Mondal%2C%20Paramita%22%29&pagesize-30">Mondal, Paramita (committee member).
Subjects/Keywords: Earthquake Engineering; Semi-rigid Frames; Seismic Design; Hybrid Simulation; Non-linear Time-response Analyses.
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APA ·
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Export
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APA (6th Edition):
Mahmoud, H. N. (2011). Seismic behavior of semi-rigid steel frames. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/26164
Chicago Manual of Style (16th Edition):
Mahmoud, Hussam N. “Seismic behavior of semi-rigid steel frames.” 2011. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 11, 2021.
http://hdl.handle.net/2142/26164.
MLA Handbook (7th Edition):
Mahmoud, Hussam N. “Seismic behavior of semi-rigid steel frames.” 2011. Web. 11 Apr 2021.
Vancouver:
Mahmoud HN. Seismic behavior of semi-rigid steel frames. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2011. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2142/26164.
Council of Science Editors:
Mahmoud HN. Seismic behavior of semi-rigid steel frames. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2011. Available from: http://hdl.handle.net/2142/26164
8.
Hart, Christopher.
Cracking of reinforced concrete structural walls subjected to cyclic loading.
Degree: PhD, 0106, 2012, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/30902
► A barrier to the development, calibration, and validation of improved and quantifiably accurate computational tools for predicting the behavior of concrete structures is the lack…
(more)
▼ A barrier to the development, calibration, and validation of improved and quantifiably accurate computational tools for predicting the behavior of concrete structures is the lack of comprehensive and dense test data from more realistic experiments. The expression “comprehensive and dense” is being used to describe the collection of full-field strains, deformations, and other test data. The term “more fully realistic” refers to test structures being of sufficient size to avoid a significant size effect and being subjected to loading regimes that are representative of what would be expected in real structures. The advanced research capabilities in the Network for Earthquake Engineering Simulation (NEES) facility at the
University of
Illinois at
Urbana-
Champaign make it possible to subject large-scale structural concrete components to complex loading histories and to make comprehensive and dense measurement of their response. The subject of this thesis is the examination of the cracking behavior and seismic response of reinforced concrete structural walls. This examination is being made using the results of a series of experiments conducted at the
University of
Illinois at
Urbana-
Champaign as part of the Network for Earthquake Engineering Simulation Research Small Group (NEESR-SG) project on the “Seismic Behavior, Analysis and Design of Complex Wall Systems”. A total of eight structural concrete walls, including planar, coupled, and C-shape walls, were subjected to reverse cyclic loading in this project. This thesis is concerned with the tensile response of all portions of the structure considering the effect of load reversals for the first five of these eight tests. More specifically, the test results are being used to assess the influence of structural reinforcement detailing and loading on the development of crack models (average crack spacing and average crack width), and tension stiffening effects. This investigation assesses the appropriateness and limitations of existing models to predict cracking and tension stiffening as needed to develop new models that can be developed using the fairly comprehensive dense data that is being collected from the aforementioned experiments.
Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A.%22%29&pagesize-30">
Kuchma,
Daniel A. (advisor),
Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A.%22%29&pagesize-30">Kuchma, Daniel A. (Committee Chair),
Champaign%22%20%2Bcontributor%3A%28%22Abrams%2C%20Daniel%20P.%22%29&pagesize-30">Abrams, Daniel P. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22LaFave%2C%20James%20M.%22%29&pagesize-30">LaFave, James M. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Lange%2C%20David%20A.%22%29&pagesize-30">Lange, David A. (committee member).
Subjects/Keywords: Reinforced Concrete Walls; Structural Walls; Cracking; Tension Stiffening; Tensile Response; Planar Walls; Coupled Walls
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hart, C. (2012). Cracking of reinforced concrete structural walls subjected to cyclic loading. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/30902
Chicago Manual of Style (16th Edition):
Hart, Christopher. “Cracking of reinforced concrete structural walls subjected to cyclic loading.” 2012. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 11, 2021.
http://hdl.handle.net/2142/30902.
MLA Handbook (7th Edition):
Hart, Christopher. “Cracking of reinforced concrete structural walls subjected to cyclic loading.” 2012. Web. 11 Apr 2021.
Vancouver:
Hart C. Cracking of reinforced concrete structural walls subjected to cyclic loading. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2012. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2142/30902.
Council of Science Editors:
Hart C. Cracking of reinforced concrete structural walls subjected to cyclic loading. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/30902
University of Illinois – Urbana-Champaign
9.
Gries, Matthew B.
Numerical study of improved methods of in-field capacity assessment of reinforced concrete bridges.
Degree: MS, 0106, 2010, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/15970
► Bridges, particularly short-span highway bridges, are basic elements of nearly all contemporary transportation networks. For reinforced concrete structures, complete information regarding the number, size, and…
(more)
▼ Bridges, particularly short-span highway bridges, are basic elements of nearly all contemporary transportation networks. For reinforced concrete structures, complete information regarding the number, size, and orientation of steel reinforcement is necessary in order to make a complete strength assessment. Since reinforcement is not visible externally, making an accurate assessment without design drawings is extremely difficult. Improving the accuracy of capacity assessments of reinforced concrete bridges when information regarding the design and construction of the bridge is limited or not available would be useful in a number of situations, including military operations and disaster response. The objective of this project is to develop more reliable means of in-field capacity assessment of reinforced concrete bridges by making improved estimates of the level of longitudinal and shear reinforcement. The proposed assessment procedure is based on comparing measured structural response under controlled loading conditions to predicted structural response from analysis. This report presents results from a preliminary sensitivity study of the analytically predicted response of simply supported reinforced concrete T-beam girders with varying levels of longitudinal and shear reinforcement.
Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A.%22%29&pagesize-30">
Kuchma,
Daniel A. (advisor).
Subjects/Keywords: reinforced concrete bridge assessment
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APA ·
Chicago ·
MLA ·
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Export
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APA (6th Edition):
Gries, M. B. (2010). Numerical study of improved methods of in-field capacity assessment of reinforced concrete bridges. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/15970
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Gries, Matthew B. “Numerical study of improved methods of in-field capacity assessment of reinforced concrete bridges.” 2010. Thesis, University of Illinois – Urbana-Champaign. Accessed April 11, 2021.
http://hdl.handle.net/2142/15970.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gries, Matthew B. “Numerical study of improved methods of in-field capacity assessment of reinforced concrete bridges.” 2010. Web. 11 Apr 2021.
Vancouver:
Gries MB. Numerical study of improved methods of in-field capacity assessment of reinforced concrete bridges. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2010. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2142/15970.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gries MB. Numerical study of improved methods of in-field capacity assessment of reinforced concrete bridges. [Thesis]. University of Illinois – Urbana-Champaign; 2010. Available from: http://hdl.handle.net/2142/15970
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
10.
Frankie, Thomas M.
Impact of complex system behavior on seismic assessment of RC bridges.
Degree: PhD, 0106, 2013, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/45318
► The damage to reinforced concrete (RC) bridges observed in the 1971 San Fernando, 1994 Northridge, and 1995 Kobe earthquakes prompted significant research efforts within the…
(more)
▼ The damage to reinforced concrete (RC) bridges observed in the 1971 San Fernando, 1994 Northridge, and 1995 Kobe earthquakes prompted significant research efforts within the earthquake engineering community. Strides were made in capturing the true inelastic seismic response of RC bridge piers, and improvements were made to seismic design methods. However, several characteristics of complex RC bridge response are not yet fully understood. The challenge of assessing risk posed to bridges with irregular or curved geometry subjected to multi-directional loading is non-trivial. The effect of the resulting combined interactions on structural response and its implications on system-level bridge vulnerability are assessed in this study.
Fragility curves generated for bridges with varying parameters provides a means for assessing the probabilistic impact of these parameters on bridge response. A set of fragility curves capable of representing the true impact of complex geometry, modeling assumptions, and multi-directional system-level response on the vulnerability of RC bridges is developed. These relationships are an improvement over existing curves developed using observational, opinion-based, or uncalibrated numerical approaches. They also avoid inaccuracies that can arise in experimental testing or calibrated numerical analyses due to assumptions made in test set-up, modeling simplifications, and disregard of system-level interaction.
Nonlinear time-history analyses are performed on a set of bridge models subjected to a suite of carefully selected seismic records. Fragility relationships are developed from the resulting structural response data. The models are carefully calibrated using a high quality experimental data set from a large-scale hybrid test successfully completed in the
Illinois Network for Earthquake Engineering Simulation (NEES) facility. The hybrid simulation of a curved four-span bridge captures the complex interactions generated by combined axial, flexural, shear, and torsional loading. An advanced six degree-of-freedom control scheme and hybrid simulation platform ensures accurate control and full system-level response. Extensive traditional and advanced instrumentation methods provide dense sets of data that can be visualized and processed for assessing structural response and performing model calibration.
Curved and straight analytical models are developed using the same set of calibrated model parameters. A suite of records representing a wide array of seismic hazards are applied to these models under varying uni-directional and multi-directional loading conditions. Nonlinear time history analyses are performed for straight and curved bridges with varying 3D loading effects and modeling assumptions. Statistical analysis is performed on the resulting structural response data to generate fragility curves. Variations in these curves represent the individual and combined influence of these parameters on system-level behavior and RC bridge vulnerability. Results further the understanding of complex…
Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A.%22%29&pagesize-30">
Kuchma,
Daniel A. (advisor),
Champaign%22%20%2Bcontributor%3A%28%22Elnashai%2C%20Amr%20S.%22%29&pagesize-30">Elnashai, Amr S. (advisor),
Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A.%22%29&pagesize-30">Kuchma, Daniel A. (Committee Chair),
Champaign%22%20%2Bcontributor%3A%28%22Elnashai%2C%20Amr%20S.%22%29&pagesize-30">Elnashai, Amr S. (Committee Chair),
Champaign%22%20%2Bcontributor%3A%28%22Spencer%2C%20Billie%20F.%2C%20Jr.%22%29&pagesize-30">Spencer, Billie F., Jr. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Gardoni%2C%20Paolo%22%29&pagesize-30">Gardoni, Paolo (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Ouyang%2C%20Yanfeng%22%29&pagesize-30">Ouyang, Yanfeng (committee member).
Subjects/Keywords: Seismic Assessment; Reinforced Concrete; Bridge; Combined Actions; Earthquake; Hybrid Simulation; Fragility Curve; Vulnerability Relationship; Illinois Network for Earthquake Engineering Simulation (NEES); Multi-axial Full-scale Substructure Testing and Simulation (MUST-SIM)
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Frankie, T. M. (2013). Impact of complex system behavior on seismic assessment of RC bridges. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/45318
Chicago Manual of Style (16th Edition):
Frankie, Thomas M. “Impact of complex system behavior on seismic assessment of RC bridges.” 2013. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 11, 2021.
http://hdl.handle.net/2142/45318.
MLA Handbook (7th Edition):
Frankie, Thomas M. “Impact of complex system behavior on seismic assessment of RC bridges.” 2013. Web. 11 Apr 2021.
Vancouver:
Frankie TM. Impact of complex system behavior on seismic assessment of RC bridges. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2013. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2142/45318.
Council of Science Editors:
Frankie TM. Impact of complex system behavior on seismic assessment of RC bridges. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2013. Available from: http://hdl.handle.net/2142/45318
11.
Mock, Andrew W.
Performance of C-Shaped structural concrete walls subjected to bi-directional loading.
Degree: PhD, Civil Engineering, 2018, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/102466
► Reinforced concrete walls are commonly used as the lateral force resisting system for mid-rise buildings in regions of low and high seismicity. Wall geometries in…
(more)
▼ Reinforced concrete walls are commonly used as the lateral force resisting system for mid-rise buildings in regions of low and high seismicity. Wall geometries in buildings are generally complex configurations to accommodate architectural constraints during new construction or existing conditions in seismic retrofit applications. A typical configuration for seismic regions is the concrete core-wall system in which coupling beams link a pair of C-shaped walls. While a prevalent structural system, few experimental research programs have examined this wall type and codes of practice have focused on design provisions for planar walls which do not fully account for the effects of non-planar geometry and multi-directional loading.
To improve the understanding of the three-dimensional and asymmetric response of coupled core walls, an experimental testing program of C-shaped walls subjected to uni-directional and bi-directional cyclic loading was completed. Three C-shaped walls representative of a ten-story core wall building were tested at the
University of
Illinois Newmark Structural Engineering Laboratory. Each wall test was subjected to progressively complex loading conditions, and a new stiffness-based loading algorithm was developed to conduct the experiment. Analysis of the experimental data studied the energy dissipation, progression of yielding, components of deformation to total wall drift, base deformations, strain fields generated from displacement field data, and overall displacement profiles of the prototype ten-story building. Subsequent evaluations using prior experimental tests of planar, coupled and non-planar walls identified the aspects of behavior unique to C-shaped walls.
The experimental tests exhibited a ductile failure resulting from loss of boundary element confinement, bar buckling, and rupture of the longitudinal bars. However, the ductile failure mechanism was precipitated by increased shear deformation and undesirable shear related damage of base sliding and web crushing. The onset of damage mechanisms, propagation of damage, and drift capacity at failure was identified to be path dependent, and bi-directional loading decreased drift capacity. Effective flexural and shear stiffness values for the elastic analysis of non-planar walls were recommended for design. Design variables and demand to capacity ratios were parametrically studied for non-planar walls as a means to correlate drift capacity and ductility. To supplement the experimental data, a series of non-linear finite element analyses were conducted using a layered shell element model with comprehensive constitutive models capturing the cracked response of reinforced concrete in cyclic biaxial loading conditions. Model validation is conducted using reinforced concrete panel tests, and the impact of crack spacing on prediction is quantified. The resulting analytical models of the C-shaped walls provide a validation of the experimental results and a characterization of shear stress distribution as a function of drift level…
Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A.%22%29&pagesize-30">
Kuchma,
Daniel A. (advisor),
Champaign%22%20%2Bcontributor%3A%28%22Spencer%2C%20Billie%20F.%22%29&pagesize-30">Spencer, Billie F. (Committee Chair),
Champaign%22%20%2Bcontributor%3A%28%22Lowes%2C%20Laura%20N.%22%29&pagesize-30">Lowes, Laura N. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Popovics%2C%20John%20S.%22%29&pagesize-30">Popovics, John S. (committee member).
Subjects/Keywords: reinforced concrete wall; non-planar wall; coupled core wall; large-scale testing; finite element analysis; shear distribution; effective stiffness
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mock, A. W. (2018). Performance of C-Shaped structural concrete walls subjected to bi-directional loading. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/102466
Chicago Manual of Style (16th Edition):
Mock, Andrew W. “Performance of C-Shaped structural concrete walls subjected to bi-directional loading.” 2018. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 11, 2021.
http://hdl.handle.net/2142/102466.
MLA Handbook (7th Edition):
Mock, Andrew W. “Performance of C-Shaped structural concrete walls subjected to bi-directional loading.” 2018. Web. 11 Apr 2021.
Vancouver:
Mock AW. Performance of C-Shaped structural concrete walls subjected to bi-directional loading. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2018. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2142/102466.
Council of Science Editors:
Mock AW. Performance of C-Shaped structural concrete walls subjected to bi-directional loading. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/102466
12.
Senalik, Christopher.
Detection and assessment of wood decay – glulam beams and wooden utility poles.
Degree: PhD, 3846, 2013, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/44281
► This report documents the development of acoustic and ultrasonic inspection methods on wooden glulam beams and utility poles. All beams and poles examined where composed…
(more)
▼ This report documents the development of acoustic and ultrasonic inspection methods on wooden glulam beams and utility poles. All beams and poles examined where composed of Douglas-fir. The report begins with a description of the structure of trees, the mechanical behavior of wood subjected to rot, and current utility pole inspection methods. Background regarding inspection methodology on wood structures is provided. Cross-sectional images of the glulam beams and the utility poles used in this study were obtained through the use of computerized axial tomography (CAT or CT) scans. Areas of decay were identified using the CT scan images. Two methods of detecting defects within glulam beams are described: ultrasonic through-transmission and impact-echo. The analysis of the wooden utility poles starts with the development of a two-dimensional, finite difference time domain (FDTD) simulation to model wave propagation through the pole. The simulation is validated against empirical results.
The through-transmission technique used on the glulam beam locates rot through the use of the highest magnitude frequency and area under the power spectrum density curve. A 100 kHz signal was sent through the glulam beam. In areas devoid of decay, the received frequency was approximately 100 kHz. In areas where decay was identified, the frequency of highest magnitude shifted lower towards 85 kHz. Also, the area under the power spectrum density curve of the received signal was greatly diminished in areas of decay.
The impact-echo method used on the glulam beams locates rot through the use of the attenuation rate. An accelerometer was affixed to the surface of the beam. A ball bearing was dropped from 200 mm above the surface next to the accelerometer. The signal was recorded. A spectrogram of the received signal was developed, and the mean rate of attenuation of the frequency range 500 Hz to 20 kHz was calculated. An attenuation rate of 1.17 Nepers per millisecond was found to be the threshold indicative of the presence of rot. Attenuation rates greater than the threshold indicated the presence of rot; lower indicated sound wood. The threshold had an overall error rate of 7.2%.
The report then shifts to developing a two-dimensional, finite difference time domain simulation that can model wave behavior through a wood pole cross-section. The model incorporates several features that have not been included in previous analyses. These features include: a frequency dispersive model of wave velocity and attenuation, cross-sectional density and geometry information collected directly from CT scans of the utility poles, a perfectly matched layer used to model the behavior or rot, and a center point formulation that allows waves to pass through the center of a cylindrically orthotropic medium. The simulation is validated against the waveform behavior predicted by an analytical model and against experimental data collected from impact through-transmission testing of three actual utility pole specimens.
Defects of…
Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Reis%2C%20Henrique%20M.%22%29&pagesize-30">Reis, Henrique M. (advisor),
Champaign%22%20%2Bcontributor%3A%28%22Reis%2C%20Henrique%20M.%22%29&pagesize-30">Reis, Henrique M. (Committee Chair),
Champaign%22%20%2Bcontributor%3A%28%22Hall%2C%20Wilfred%20B.%22%29&pagesize-30">Hall, Wilfred B. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A.%22%29&pagesize-30">Kuchma, Daniel A. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Sreenivas%2C%20Ramavarapu%20S.%22%29&pagesize-30">Sreenivas, Ramavarapu S. (committee member).
Subjects/Keywords: Non-Destructive Evaluation; Wood; Douglas-fir; Brown Rot Decay; Finite Difference; Utility Poles; Glulam Beams; Wave Propagation; Acousto-ultrasonic; Dispersion
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APA ·
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Export
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Manager
APA (6th Edition):
Senalik, C. (2013). Detection and assessment of wood decay – glulam beams and wooden utility poles. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/44281
Chicago Manual of Style (16th Edition):
Senalik, Christopher. “Detection and assessment of wood decay – glulam beams and wooden utility poles.” 2013. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 11, 2021.
http://hdl.handle.net/2142/44281.
MLA Handbook (7th Edition):
Senalik, Christopher. “Detection and assessment of wood decay – glulam beams and wooden utility poles.” 2013. Web. 11 Apr 2021.
Vancouver:
Senalik C. Detection and assessment of wood decay – glulam beams and wooden utility poles. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2013. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2142/44281.
Council of Science Editors:
Senalik C. Detection and assessment of wood decay – glulam beams and wooden utility poles. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2013. Available from: http://hdl.handle.net/2142/44281
13.
Sim, Sung Han.
Decentralized identification and multimetric monitoring of civil infrastructure using smart sensors.
Degree: PhD, 0106, 2011, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/24248
► Wireless Smart Sensor Networks (WSSNs) facilitates a new paradigm to structural identification and monitoring for civil infrastructure. Conventionally, wired sensors and central data acquisition systems…
(more)
▼ Wireless Smart Sensor Networks (WSSNs) facilitates a new paradigm to structural identification and monitoring for civil infrastructure. Conventionally, wired sensors and central data acquisition systems have been used to characterize the state of the structure, which is quite challenging due to difficulties in cabling, long setup time, and high equipment and maintenance costs. WSSNs offer a unique opportunity to overcome such difficulties. Recent advances in sensor technology have realized low-cost, smart sensors with on-board computation and wireless communication capabilities, making deployment of a dense array of sensors on large civil structures both feasible and economical. However, as opposed to wired sensor networks in which centralized data acquisition and processing are common practice, WSSNs require decentralized algorithms due to the limitation associated with wireless communication; to date such algorithms are limited. This research develops new decentralized algorithms for structural identification and monitoring of civil infrastructure. To increase performance, flexibility, and versatility of the WSSN, the following issues are considered specifically: (1) decentralized modal analysis, (2) efficient decentralized system identification in the WSSN, and (3) multimetric sensing. Numerical simulation and laboratory testing are conducted to verify the efficacy of the proposed approaches. The performance of the decentralized approaches and their software implementations are validated through full-scale applications at the Irwin Indoor Practice Field in the
University of
Illinois at
Urbana-
Champaign and the Jindo Bridge, a 484 meter-long cable-stayed bridge located in South Korea. This research provides a strong foundation on which to further develop long-term monitoring employing a dense array of smart sensors. The software developed in this research is opensource and is available at: http://shm.cs.uiuc.edu/.
Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Spencer%2C%20Billie%20F.%2C%20Jr.%22%29&pagesize-30">Spencer, Billie F., Jr. (advisor),
Champaign%22%20%2Bcontributor%3A%28%22Spencer%2C%20Billie%20F.%2C%20Jr.%22%29&pagesize-30">Spencer, Billie F., Jr. (Committee Chair),
Champaign%22%20%2Bcontributor%3A%28%22Elnashai%2C%20Amr%20S.%22%29&pagesize-30">Elnashai, Amr S. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Agha%2C%20Gul%20A.%22%29&pagesize-30">Agha, Gul A. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A.%22%29&pagesize-30">Kuchma, Daniel A. (committee member).
Subjects/Keywords: structural health monitoring; smart sensor; decentralized data processing; multimetric sensing; decentralized modal analysis
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APA (6th Edition):
Sim, S. H. (2011). Decentralized identification and multimetric monitoring of civil infrastructure using smart sensors. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/24248
Chicago Manual of Style (16th Edition):
Sim, Sung Han. “Decentralized identification and multimetric monitoring of civil infrastructure using smart sensors.” 2011. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 11, 2021.
http://hdl.handle.net/2142/24248.
MLA Handbook (7th Edition):
Sim, Sung Han. “Decentralized identification and multimetric monitoring of civil infrastructure using smart sensors.” 2011. Web. 11 Apr 2021.
Vancouver:
Sim SH. Decentralized identification and multimetric monitoring of civil infrastructure using smart sensors. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2011. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2142/24248.
Council of Science Editors:
Sim SH. Decentralized identification and multimetric monitoring of civil infrastructure using smart sensors. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2011. Available from: http://hdl.handle.net/2142/24248
14.
Oesch, Tyler Scott.
Investigation of fiber and cracking behavior for conventional and ultra-high performance concretes using x-ray computed tomography.
Degree: PhD, Civil Engineering, 2015, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/78353
► To make significant advances in concrete engineering, understanding the behavior of cementitious materials at the micro-scale will be necessary. To reach this goal, the location…
(more)
▼ To make significant advances in concrete engineering, understanding the behavior of cementitious materials at the micro-scale will be necessary. To reach this goal, the location and orientation of constituent materials within concrete members, as well as the nature of damage initiation and growth, need to be understood at very small scales. This dissertation sought to increase that understanding through the collection of micro-scale data using x-ray computed tomography (CT). The quasi-static phenomena investigated included the tensile, compression, and reinforcing bar pull-out behavior of both ultra-high performance concrete (UHPC) and conventional concrete. Ballistic damage of UHPC samples was also investigated. These testing efforts yielded a number important results. First, relationships were identified between mechanical performance and cracking parameters that could be quantified mathematically and implemented into future finite element analysis models. Second, these test results demonstrated that the cracking structures of UHPC samples subjected to the double punch test (DPT) are heavily influenced by fiber anisotropy. This can lead to actual crack structures that are significantly at variance with the theoretical crack structure, which may decrease DPT accuracy in predicting tensile strength. Third, fiber orientations within both small and large samples of UHPC were demonstrated to be highly anisotropic. Thus, the assumption of a uniform distribution of fiber orientations within UHPC could lead to significant over-predictions of strength in some structural members. The results of this dissertation have the potential to both improve the accuracy and resiliency of numerical models as well as provide insight to the materials engineering and structural design communities about the optimal use of UHPC.
Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A.%22%29&pagesize-30">
Kuchma,
Daniel A. (advisor),
Champaign%22%20%2Bcontributor%3A%28%22Spencer%2C%20Billie%20F.%2C%20Jr.%22%29&pagesize-30">Spencer, Billie F., Jr. (Committee Chair),
Champaign%22%20%2Bcontributor%3A%28%22Landis%2C%20Eric%20N%22%29&pagesize-30">Landis, Eric N (committee member),
Champaign%22%20%2Bcontributor%3A%28%22O%C3%A2%C2%80%C2%99Daniel%2C%20James%20L%22%29&pagesize-30">O’Daniel, James L (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Lange%2C%20David%20A.%22%29&pagesize-30">Lange, David A. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Cusatis%2C%20Gianluca%22%29&pagesize-30">Cusatis, Gianluca (committee member).
Subjects/Keywords: X-Ray Computed Tomography (CT); Double Punch Test (DPT); Fiber Reinforced Concrete; Ultra-High Performance Concrete (UHPC); Anisotropic Fiber Orientation; Digital Image Processing
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Oesch, T. S. (2015). Investigation of fiber and cracking behavior for conventional and ultra-high performance concretes using x-ray computed tomography. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/78353
Chicago Manual of Style (16th Edition):
Oesch, Tyler Scott. “Investigation of fiber and cracking behavior for conventional and ultra-high performance concretes using x-ray computed tomography.” 2015. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 11, 2021.
http://hdl.handle.net/2142/78353.
MLA Handbook (7th Edition):
Oesch, Tyler Scott. “Investigation of fiber and cracking behavior for conventional and ultra-high performance concretes using x-ray computed tomography.” 2015. Web. 11 Apr 2021.
Vancouver:
Oesch TS. Investigation of fiber and cracking behavior for conventional and ultra-high performance concretes using x-ray computed tomography. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2015. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2142/78353.
Council of Science Editors:
Oesch TS. Investigation of fiber and cracking behavior for conventional and ultra-high performance concretes using x-ray computed tomography. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/78353
15.
Elanwar Amin, Hazem.
On-line model updating in earthquake hybrid simulation.
Degree: PhD, 0106, 2015, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/73040
► Hybrid simulation has emerged as a relatively accurate and efficient tool for the evaluation of structural response under earthquake loading. In the conventional hybrid simulation,…
(more)
▼ Hybrid simulation has emerged as a relatively accurate and efficient tool for the evaluation of structural response under earthquake loading. In the conventional hybrid simulation, the responses of few critical components are obtained by testing while the numerical module is assumed to follow an analytical idealization. Where there is a much larger number of analytical components compared to the experimental parts, the overall response may be dominated by the idealized parts hence the value of hybrid simulation is diminished. It is proposed to update the behavior of the material constitutive relationship of the numerical model during the test, based on the data obtained from the physically tested component.
Identifying the parameters that govern the constitutive relationship behavior from the experimental module is a challenging task. Hence, an approach based on optimization tools is developed to determine the model parameters that minimize the error between the numerical and experimental modules. Interior point methods and genetic algorithms are adopted as gradient and non-gradient optimization tools, respectively. Each of which provides different features that are suitable for various types of applications in earthquake response assessment. On the other hand, neural network is utilized as an alternative identification approach. Neural network is advantageous in case the analytical constitutive relationships are not suitable to represent the actual model behavior, as it can be trained independent from analytical guidance to find the mathematical formulas that correlate the input strain to the output stresses.
UI-SIMCOR the platform utilized to conduct the hybrid simulation analyses. It can communicate with several finite element programs. Amongst others, ZeusNL is used to analyze the numerical modules due to its efficiency in representing cases of extreme loading and non-linear problems. For model updating purposes, the source codes and the communication protocols between UI-SIMCOR and ZeusNL are modified to be able to exchange the stress-strain information during the hybrid simulation test. Several steel and concrete constitutive models included in ZeusNL library are implemented in the proposed approach. In addition, the components required for the neural network procedure are introduced to the program.
The scope of the work also includes verifying the model updating concept through analyzing several numerical problems. These problems include the assessment of regular and irregular structural systems. Moreover, it is shown that through updating the parameters of a simple constitutive model, it can capture the behavior of a more advanced one. Additionally, a number of previously conducted experiments are investigated. A procedure is presented to determine the constitutive model information from the tested component. This procedure is implemented to identify the constitutive model parameters representing a steel beam-column connection and a multi-bay concrete bridge subjected to combined loading. The…
Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Elnashai%2C%20Amr%20S.%22%29&pagesize-30">Elnashai, Amr S. (advisor),
Champaign%22%20%2Bcontributor%3A%28%22Elnashai%2C%20Amr%20S.%22%29&pagesize-30">Elnashai, Amr S. (Committee Chair),
Champaign%22%20%2Bcontributor%3A%28%22Spencer%2C%20Billie%20F.%2C%20Jr.%22%29&pagesize-30">Spencer, Billie F., Jr. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Lange%2C%20David%20A.%22%29&pagesize-30">Lange, David A. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A.%22%29&pagesize-30">Kuchma, Daniel A. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Fahnestock%2C%20Larry%20A.%22%29&pagesize-30">Fahnestock, Larry A. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Cha%2C%20Eun%20J.%22%29&pagesize-30">Cha, Eun J. (committee member).
Subjects/Keywords: Model Updating; Hybrid Simulation; Earthquake Engineering; Optimization; Neural Networks
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APA ·
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MLA ·
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CSE |
Export
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APA (6th Edition):
Elanwar Amin, H. (2015). On-line model updating in earthquake hybrid simulation. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/73040
Chicago Manual of Style (16th Edition):
Elanwar Amin, Hazem. “On-line model updating in earthquake hybrid simulation.” 2015. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 11, 2021.
http://hdl.handle.net/2142/73040.
MLA Handbook (7th Edition):
Elanwar Amin, Hazem. “On-line model updating in earthquake hybrid simulation.” 2015. Web. 11 Apr 2021.
Vancouver:
Elanwar Amin H. On-line model updating in earthquake hybrid simulation. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2015. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2142/73040.
Council of Science Editors:
Elanwar Amin H. On-line model updating in earthquake hybrid simulation. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/73040
16.
Gencturk, Bora.
Multi-objective optimal seismic design of buildings using advanced engineering materials.
Degree: PhD, 0106, 2011, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/26252
► Although seismic safety remains a major concern of society – and unfortunately this observation has been underpinned by recent earthquakes – economy and sustainability in seismic design…
(more)
▼ Although seismic safety remains a major concern of society – and unfortunately this observation has been underpinned by recent earthquakes – economy and sustainability in seismic design are growing issues that the engineering community must face due to increasing human population and excessive use of the earth???s nonrenewable resources. Previous studies have addressed the design and assessment of buildings under seismic loading considering a single objective, namely, safety. Seismic design codes and regulations also center on this objective.
The goal of this study is to develop a framework that concurrently addresses the societal-level objectives of safety, economy and sustainability using consistent tools at every component of the analysis. To this end, a high-performance material; namely, engineered cementitious composites (ECC) is utilized. ECC is classified under the general class of fiber-reinforced concrete (FRC); however, ECC is superior to conventional FRC in many aspects, but most importantly in its properties of energy absorption, shear resistance and damage tolerance, all of which are utilized in the proposed procedure. The behavior of ECC is characterized through an experimental program at the small-scale (scale factor equal to 1/8). ECC mixtures with different cost and sustainability indices are considered. It is seen that all ECC mixtures outperform concrete to different extents of stiffness, strength, ductility and energy absorption under cyclic loading conditions. Under simulated earthquake motion, ECC shows significant damage tolerance resulting from increased shear and spalling resistance and reduced interstory drifts.
Numerical modeling of ECC is also performed to carry out structural level simulations to complement the experimental data. A constitutive model is developed for ECC and validated at the material, component and system levels. The numerical tool is utilized in the experimental program for hybrid simulation and life-cycle cost (LCC) optimization as described briefly below. Additionally, a parametric study of ECC columns is performed to investigate the effect of material tensile properties on the structural level response metrics. It is observed that the material properties have a major effect on member strength, ductility and energy absorption capacity, while the member stiffness is relatively insensitive.
Reducing the LCC of buildings (through reductions in material usage and seismic damage cost) is required to achieve the objectives of economy and sustainability. A rigorous LCC formulation that uses advanced analysis for structural assessment, and that takes into account all sources of uncertainty, is used along with an efficient search algorithm to compare the optimal design solutions. A novel aspect of this work is that three different structural frames are considered, RC, ECC and a multi-material frame in which ECC is deployed only at the critical locations (e.g. plastic hinges) to improve seismic performance. It is found that both the initial and LCC of frames that use ECC are…
Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Elnashai%2C%20Amr%20S.%22%29&pagesize-30">Elnashai, Amr S. (advisor),
Champaign%22%20%2Bcontributor%3A%28%22Elnashai%2C%20Amr%20S.%22%29&pagesize-30">Elnashai, Amr S. (Committee Chair),
Champaign%22%20%2Bcontributor%3A%28%22Spencer%2C%20Billie%20F.%2C%20Jr.%22%29&pagesize-30">Spencer, Billie F., Jr. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Popovics%2C%20John%20S.%22%29&pagesize-30">Popovics, John S. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Kuchma%2C%20Daniel%20A.%22%29&pagesize-30">Kuchma, Daniel A. (committee member),
Champaign%22%20%2Bcontributor%3A%28%22Song%2C%20Junho%22%29&pagesize-30">Song, Junho (committee member).
Subjects/Keywords: Engineered Cementitious Composites (ECC); Reinforced Concrete; Sustainability; Small-Scale Testing; Life-Cycle Cost Analysis; Optimization; Taboo Search; Dynamic Analysis; Finite Element Analysis; Constitutive Model; Performance-Based Seismic Design; Probabilistic Seismic Hazard Analysis; Spectrum Matching; Ground Motion Selection
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APA ·
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MLA ·
Vancouver ·
CSE |
Export
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APA (6th Edition):
Gencturk, B. (2011). Multi-objective optimal seismic design of buildings using advanced engineering materials. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/26252
Chicago Manual of Style (16th Edition):
Gencturk, Bora. “Multi-objective optimal seismic design of buildings using advanced engineering materials.” 2011. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 11, 2021.
http://hdl.handle.net/2142/26252.
MLA Handbook (7th Edition):
Gencturk, Bora. “Multi-objective optimal seismic design of buildings using advanced engineering materials.” 2011. Web. 11 Apr 2021.
Vancouver:
Gencturk B. Multi-objective optimal seismic design of buildings using advanced engineering materials. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2011. [cited 2021 Apr 11].
Available from: http://hdl.handle.net/2142/26252.
Council of Science Editors:
Gencturk B. Multi-objective optimal seismic design of buildings using advanced engineering materials. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2011. Available from: http://hdl.handle.net/2142/26252
. 
Open Access Theses and Dissertations
