Design of Flexible, Anisotropic Pipe Liners Using Finite-Element Method
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 14, Issue 3
Abstract
Conduits with noncircular (primarily egg-shaped and arched) cross sections were used widely in the past to improve flow conditions and reduce sedimentation, particularly in combined sewer systems, as shown in the literature. Rehabilitation of such noncircular pipes can be undertaken with flexible liners such as fiber reinforced polymer (FRP). A new finite-element analysis (FEA) based design method is proposed by the authors for anisotropic and flexible liners. The proposed computational model with three-dimensional FEA was validated by laboratory testing and compared to a design equation in the literature for flexible liners. The laboratory test was composed of parallel plate loading on a stand-alone, egg-shaped FRP liner sample based on ASTM D2412. The proposed FEA model was shell based with finer triangle element mesh control on singular points. The FEA model factored in the host pipe, liner, as well as the lined-pipe–soil interaction as the surrounding soil providing elastic support. The FEA results correlated with those of Thepot method and lab tests 99% and 83%, respectively. Upon validating the proposed FEA model, the method was further applied to a tunnel with a teardrop cross section and an arch-shaped large sewer. The results of the analysis performed suggest that the proposed computational method with the FEA, by utilizing the customized parameters described above, offered a practical means to overcome the complexities of using anisotropic and flexible liners in noncircular conduits. The lab test results on the egg-shaped FRP liner sample suggest both the Thepot method and the proposed FEA model were on the conservative side.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
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Information & Authors
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 14 • Issue 3 • August 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Mar 1, 2022
Accepted: Jan 9, 2023
Published online: Apr 11, 2023
Published in print: Aug 1, 2023
Discussion open until: Sep 11, 2023
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