Uplift Resistance of Long Pipelines in the Presence of Seismic Forces
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 5, Issue 4
Abstract
The vertical uplift resistance of long pipes buried in sands and subjected to pseudostatic seismic forces has been computed by using the lower-bound theorem of the limit analysis in conjunction with finite elements and nonlinear optimization. The soil mass is assumed to follow the Mohr-Coulomb failure criterion and an associated flow rule. The failure load is expressed in the form of a nondimensional uplift factor . The variation of is plotted as a function of the embedment ratio of the pipe, horizontal seismic acceleration coefficient (), and soil friction angle (). The magnitude of is found to decrease continuously with an increase in the horizontal seismic acceleration coefficient. The reduction in the uplift resistance becomes quite significant, especially for greater values of embedment ratios and lower values of friction angle. The predicted uplift resistance was found to compare well with the existing results reported from the literature.
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 5 • Issue 4 • November 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 4, 2013
Accepted: Feb 28, 2014
Published online: May 6, 2014
Discussion open until: Oct 6, 2014
Published in print: Nov 1, 2014
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