Three-Dimensional Nonlinear Seismic Analysis of Single Piles Using Finite Element Model: Effects of Plasticity of Soil
Publication: International Journal of Geomechanics
Volume 5, Issue 1
Abstract
Much of the reported research on the dynamic analysis of pile foundations assumes linear behavior of soil that may not be valid for strong excitations. In this paper, material nonlinearity of the soil caused by plasticity and work hardening is considered in the dynamic analysis of pile foundations. An advanced plasticity based soil model, HiSS, is incorporated in a finite element technique. To simulate radiation effects, proper boundary conditions are used. The model and algorithm are verified with analytical results that are available for elastic and elastoplastic soil models. Analyses are carried out for free-field response and pile head response of end-bearing single piles. Both harmonic and transient excitations are considered in the analyses. Effects of frequency of excitation and stiffness of soil are investigated. It was found that the nonlinearity of soil has significant effects on the pile response for lower and moderate frequencies of excitations while at higher frequencies its effects are not as significant.
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Acknowledgments
The research presented here was partially supported by the MidAmerica Earthquake Center under National Science Foundation Grant EEC-9701785 and the U.S. Army Corps of Engineers. This support is gratefully acknowledged. The writers are thankful to Professor C. S. Desai and Dr. G. W. Wathugala for providing literature on the HiSS soil model. The writers are also thankful to Dr. Y. X. Cai for his cooperation.
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Published In
International Journal of Geomechanics
Volume 5 • Issue 1 • March 2005
Pages: 35 - 44
Copyright
© 2005 ASCE.
History
Received: Jul 1, 2002
Accepted: Mar 5, 2004
Published online: Mar 1, 2005
Published in print: Mar 2005
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