Jointed Pipeline Response to Large Ground Deformation
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 7, Issue 1
Abstract
The performance of segmental pipelines under large ground deformation is strongly influenced by the axial pullout and compressive load capacity of their joints, as well as by the limits on joint rotation during permanent and transient ground deformation. Although ductile iron (DI) pipelines with push-on joints are commonly used in water distribution systems, experimental data and numerical simulation related to their performance under large ground movements are lacking. This paper reports on a series of specially designed four-point bending experiments and finite-element (FE) simulations to characterize 150-mm (6-in.) diameter DI push-on joints. The results were used to develop a relationship between rotation and metal binding as a function of axial pullout, as well as to determine the magnitudes of rotation and moment that initiate joint leakage. FE simulations were performed to investigate the deformation associated with joint leakage. Uniaxial tension and one-dimensional compression tests were performed on the elastomeric gasket and fitted with hyperelastic strain energy approximations to characterize behavior under extreme loading. Numerical models demonstrate joint leakage to be independent of load path, and that a unique pressure boundary predicts leakage for many combinations of deformation.
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Acknowledgments
The work described in this paper was supported by the George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) Program of the National Science Foundation (NSF), under award No. CMMI-1041498. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the NSF. Thanks are extended to the Los Angeles Department of Water and Power for providing the pipeline specimens, Specification Rubber Products Inc., Alabaster, Alabama, for supplying rubber gasket test samples, and to U.S. Pipe Inc. for providing information regarding the joint characteristics.
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 7 • Issue 1 • February 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Oct 9, 2014
Accepted: Mar 16, 2015
Published online: Jun 1, 2015
Discussion open until: Nov 1, 2015
Published in print: Feb 1, 2016
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