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You searched for subject:(cured in place). Showing records 1 – 2 of 2 total matches.

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1. Mottl, Natalie Lucia. Material Characterization and Testing of Cured-in-Place Pipe to Resist Earthquake Related Ground Deformation.

Degree: M.S., Civil and Environmental Engineering, Civil and Environmental Engineering, 2019, Cornell University

This thesis summarizes the testing procedures and key results of full-scale tests on Cured-In-Place Pipe (CIPP) to evaluate its performance under earthquake induced ground deformation. The CIPP used in this work is commercially available as Aqua-pipe, manufactured by Sanexen Environmental Services, Inc. to rehabilitate water mains. The investigation covered in this work includes tensile coupon tests, direct tension tests, friction tests, and direct shear tests. The test results improve the understanding and characterization of the axial force vs. displacement relationship for CIPP movement relative to the host pipe, lining/pipe interface friction, and the effects of geometry, internal pressure, and repeated loading on the axial force vs. relative displacement relationship. The direct tension test results show that the mobilization of axial force is affected by Mode II fracture propagation, friction between the exterior surface of the lining and interior surface of the host pipe, and geometric resistance generated by the relative movement of the lining within a host pipe of variable inside diameter. The most important finding from the direct tension tests is that substantial additional axial forces may be mobilized after debonding as the lining is affected by geometric interference caused by movement through a pipe with variable internal diameter. The test results provide a first-time confirmation of this loading mechanism. The friction tests show that the axial load response is independent of loading rate, with a similar load range and maximum load for the tests conducted at 1 in. (25 mm)/min, 10 in. (250 mm)/min, and 100 in. (2500 mm)/min. The first friction test, done under no pressure, developed larger axial forces due to the greater frictional resistance between the lining and pipe than in a subsequent test under the same testing conditions and geometry. The difference in the axial loads show that over-cleaned field pipes or new ductile iron pipes can have a greater frictional resistance between the lining and pipe than properly cleaned or previously loaded pipes. The most important result from the friction tests involves the influence of internal pressure on axial load response. As the internal pressure increased, the axial load for a given displacement increased linearly. Regressions of axial load vs. internal pressure at the same levels of displacement show a clear linear relationship with similar slopes. The results of the direct shear tests for new ductile iron and field cast iron pipes show a coefficient of friction of 0.61. This value represents the relatively smooth debonded lining surface conditions representative of the CIPP cleaning and lining process for old cast iron water mains. It also represents the interface between the lining and new ductile iron pipe after repeated displacements. The test results show that a coefficient of friction of 0.84 is a good estimate for lining/pipe interfaces that are rough and irregular. Advisors/Committee Members: O'Rourke, Thomas Denis (chair), Stewart, Harry Eaton (committee member).

Subjects/Keywords: Civil engineering; cured-in-place; deformation; pipeline; earthquake

…full-scale testing to characterize the performance of Cured-in-Place Pipe (CIPP)… …epoxy and cured in place. Figure 1.4 shows Aqua-pipe after curing inside of an existing… …between each access pit. The installation process begins by cleaning the pipe in-place. Then the… …direction. Tensile coupon specimens in the weft direction were cut and machined from flat cured… …6 Figure 2.2. Schematic of Aqua-pipe Tensile Coupon Specimen in the Warp Direction 6… 

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

APA (6th Edition):

Mottl, N. L. (2019). Material Characterization and Testing of Cured-in-Place Pipe to Resist Earthquake Related Ground Deformation. (Masters Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/67679

Chicago Manual of Style (16th Edition):

Mottl, Natalie Lucia. “Material Characterization and Testing of Cured-in-Place Pipe to Resist Earthquake Related Ground Deformation.” 2019. Masters Thesis, Cornell University. Accessed April 20, 2021. http://hdl.handle.net/1813/67679.

MLA Handbook (7th Edition):

Mottl, Natalie Lucia. “Material Characterization and Testing of Cured-in-Place Pipe to Resist Earthquake Related Ground Deformation.” 2019. Web. 20 Apr 2021.

Vancouver:

Mottl NL. Material Characterization and Testing of Cured-in-Place Pipe to Resist Earthquake Related Ground Deformation. [Internet] [Masters thesis]. Cornell University; 2019. [cited 2021 Apr 20]. Available from: http://hdl.handle.net/1813/67679.

Council of Science Editors:

Mottl NL. Material Characterization and Testing of Cured-in-Place Pipe to Resist Earthquake Related Ground Deformation. [Masters Thesis]. Cornell University; 2019. Available from: http://hdl.handle.net/1813/67679


Cornell University

2. Argyrou, Christina. PIPELINE RESPONSE TO EARTHQUAKE-INDUCED GROUND DEFORMATION.

Degree: PhD, Civil and Environmental Engineering, 2018, Cornell University

The primary focus of this thesis is the evaluation through experimental and numerical investigations of pipeline performance under earthquake-induced ground deformation. This kind of deformation is associated with soil liquefaction, landslides, fault rupture, tectonic uplift and subsidence and settlement of loose granular soils. A large part of this thesis involves the earthquake response of pipelines with defects, e.g., cracks and/or leaking joints, rehabilitated with cured-in-place linings (CIPLs). The thesis begins with the description of a series of full-scale static and dynamic axial tension tests to characterize the tensile capacity of CIPL-reinforced pipelines. The CIPL de-bonding is of great importance for the accommodation of tensile deformation. The amount of CIPL de-bonding is a function of the CIPL properties (i.e. stiffness, tensile strength) with respect to the pipe/CIPL interface bond strength, which increases with increasing internal pressure. A one-dimensional finite element model is developed that accounts for the CIPL de-bonding mechanism as a Mode II fracture propagation phenomenon, including the enhanced pipe/CIPL interface strength in the presence of internal pressure. Seismic wave interaction with CIPL-reinforced pipelines subjects them to alternating tension and compression as the waves propagate through the ground. The combinations of ground velocity amplitude and pulse period that cause lining deformation are evaluated through analytical models of seismic wave/pipeline interaction and finite element simulations. CIPL-strengthened pipeline response to permanent ground deformation was also investigated through large-scale fault rupture experiments and numerical simulations. Fault rupture test results on pipelines with CIPLs are presented and compared with test results on unlined pipelines, to assess the effectiveness of the CIPLs for seismic retrofit. The results of the numerical model developed in this work that accounts for de-bonding between the lining and pipe as Mode II fracture propagation are in good agreement with full-scale fault rupture test results. The thesis also includes a comprehensive evaluation of ductile iron (DI) pipeline response to earthquake-induced ground deformation through the results of a large-scale testing program, including a fault rupture test on a 150-mm DI pipeline with restrained axial slip joints. Three different types of DI joints are considered in this study: push-on, restrained, and restrained axial slip joints, which are often referred to as hazard-resilient joints. A series of axial tension, axial compression, four-point bending and ground rupture test results conducted on DI jointed pipes are used to identify the limit states associated with DI joint performance. A two-dimensional finite element model accounting for (i) coupled shear/normal forces to the pipeline and (ii) bell resistance to movement, validated against large-scale fault rupture test results, is used for the quantification of the DI pipeline performance under strike-slip faulting… Advisors/Committee Members: O'Rourke, Thomas Denis (chair), Nozick, Linda K. (committee member), Stewart, Harry Eaton (committee member), Grigoriu, Mircea Dan (committee member).

Subjects/Keywords: Finite Element Modeling; cured-in-place linings; pipelines; seismic retrofit; soil-pipeline interaction; Civil engineering

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

APA (6th Edition):

Argyrou, C. (2018). PIPELINE RESPONSE TO EARTHQUAKE-INDUCED GROUND DEFORMATION. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/59321

Chicago Manual of Style (16th Edition):

Argyrou, Christina. “PIPELINE RESPONSE TO EARTHQUAKE-INDUCED GROUND DEFORMATION.” 2018. Doctoral Dissertation, Cornell University. Accessed April 20, 2021. http://hdl.handle.net/1813/59321.

MLA Handbook (7th Edition):

Argyrou, Christina. “PIPELINE RESPONSE TO EARTHQUAKE-INDUCED GROUND DEFORMATION.” 2018. Web. 20 Apr 2021.

Vancouver:

Argyrou C. PIPELINE RESPONSE TO EARTHQUAKE-INDUCED GROUND DEFORMATION. [Internet] [Doctoral dissertation]. Cornell University; 2018. [cited 2021 Apr 20]. Available from: http://hdl.handle.net/1813/59321.

Council of Science Editors:

Argyrou C. PIPELINE RESPONSE TO EARTHQUAKE-INDUCED GROUND DEFORMATION. [Doctoral Dissertation]. Cornell University; 2018. Available from: http://hdl.handle.net/1813/59321

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