Experimental Performance Evaluation of Pipelines Rehabilitated with Cured-In-Place Pipe Liner under Earthquake Transient Ground Deformations
Publication: Journal of Infrastructure Systems
Volume 23, Issue 2
Abstract
The cured-in-place pipe (CIPP) liner technology involves installation of flexible polymeric composite liners coated with thermosetting resin to the inner surfaces of existing pipelines. This innovative technology provides an efficient, economic, and environmentally friendly method for rehabilitation of structurally compromised underground pipelines without expensive and disruptive excavation. However, the unverified and unquantified seismic performance of CIPP liner-reinforced pipelines under earthquake transient ground deformations (TGD) remains a barrier to the deployment of this technology in seismically active regions. Full-scale quasi-static and dynamic tests were performed on five water-pressurized ductile iron (DI) pipelines, with 150-mm (6.0-in.) nominal diameter and 9.14-m (30-ft) nominal length, reinforced with one type of CIPP liner commonly used in engineering practice. This paper evaluates experimentally the behavior of the liner-strengthened DI pipelines under static loading and also quantifies their seismic response under TGD-induced tensile axial loads. The test results indicate that CIPP liner provides substantial longitudinal tensile stiffness and strength to the joints of DI pipelines and improves significantly their seismic behavior under high-intensity TGD.
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Acknowledgments
The work reported in this paper was supported by the George E. Brown, Jr., Network for Earthquake Engineering Simulation (NEES) Program of the National Science Foundation (NSF), Grant CMS-421142. Any opinions, findings, conclusions, or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of NSF. Sincere thanks are extended to Prof. Thomas D. O’Rourke, Prof. Harry E. Stewart, and Dr. Dimitra Bouziou from the School of Civil and Environmental Engineering at Cornell University for providing input motions and sharing important opinions in performing shake-table tests. The Los Angeles Department of Water and Power (LADWP) is also gratefully acknowledged for providing the pipeline specimens.
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Published In
Journal of Infrastructure Systems
Volume 23 • Issue 2 • June 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Apr 23, 2015
Accepted: Jun 20, 2016
Published online: Sep 13, 2016
Discussion open until: Feb 13, 2017
Published in print: Jun 1, 2017
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