Buried Continuous and Segmented Pipelines Subjected to Longitudinal Permanent Ground Deformation
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 10, Issue 4
Abstract
In responding to the need for improved technologies to accommodate permanent ground deformation imposed by earthquakes, landslides, and other sources, a new family of segmented pipelines has emerged employing joints that displace axially and deflect before locking up and restraining further movement. Other than employing finite-element modeling, there is no existing procedure allowing practicing engineers to efficiently evaluate displacements and strains that develop along segmented pipelines consistent with those of continuous pipelines at equivalent levels of potential ground movement. A methodology is presented that allows continuous and segmented pipelines of any defined material in the elastic range to be evaluated consistently using a single set of equations for block ground deformations moving parallel to the longitudinal pipe axis. The equations reduce to previously recognized solutions for continuous pipelines as the segmented pipe joints reach their allowable displacement. Results show how the hybrid-segmented pipelines have lower axial strains than continuous pipes for equivalent levels of block deformation. The proposed model provides a fundamental basis for engineering design selection of continuous and segmented pipelines in hazard-prone regions.
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Acknowledgments
The authors want to thank Prof. M. O’Rourke, Renssalaer Polytechnic Institute, for valuable discussions and input. Comments from the ASCE Task Committee on Seismic Design of Buried Pipelines during the March 2018 meeting are acknowledged. The authors want to acknowledge both contributed equally to this study.
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©2019 American Society of Civil Engineers.
History
Received: Aug 30, 2018
Accepted: Feb 26, 2019
Published online: Sep 12, 2019
Published in print: Nov 1, 2019
Discussion open until: Feb 12, 2020
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