Plasticity Model for Nonlinear Dynamic Analysis of Piles in Liquefiable Soil
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 139, Issue 8
Abstract
Liquefiable soil-structure interaction material models are developed and implemented in the open-source finite-element modeling platform OpenSees. Inputs to the free end of the materials include the ground motion and mean effective stress time series from a free-field soil column. Example simulations using a single element attached to a soil element demonstrate key features. The models are then used to analyze centrifuge experiments of a single pile in a level liquefiable profile and a six-pile group in a sloping liquefiable profile that resulted in lateral spreading. Measured displacements and mean effective stress time series are used as inputs to isolate the response of the material models from predictive uncertainties in free-field ground motion and excess pore pressure. The predicted pile response agrees reasonably well with measurements. The cyclic mobility behavior of sand in undrained loading is shown to be an important mechanism affecting bending moments in the piles; neglecting the dilatancy component of the sand's response (i.e., ignoring the cyclic mobility behavior) can result in underprediction of the demands imposed on the piles.
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Acknowledgments
Funding for this work was provided by Caltrans and the National Science Foundation through the Pacific Earthquake Engineering Research Center. The authors thank Christina Curras for doing the initial model development work on the material models prior to their implementation in OpenSees. Tom Shantz provided valuable technical comments and suggestions. The centrifuge shaker was designed and constructed with support from the National Science Foundation (NSF), Obayashi Corp., Caltrans, and the University of California. Upgrades were funded by NSF Award No. CMS-0086566 through the George E. Brown, Jr., Network for Earthquake Engineering Simulation (NEES). The contents of this paper do not necessarily represent a policy of either funding agency or endorsement by the state or federal government.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 139 • Issue 8 • August 2013
Pages: 1262 - 1274
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Sep 6, 2011
Accepted: Oct 1, 2012
Published online: Oct 3, 2012
Published in print: Aug 1, 2013
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