Seismic Behavior of Soil-Pile-Structure Interaction in Liquefiable Soils: Parametric Study
Publication: International Journal of Geomechanics
Volume 11, Issue 4
Abstract
Nonlinearity of the soil medium plays a very important role on the seismic behavior of soil-pile-structure interaction. The problem of soil-pile-structure interaction is further complicated when the piles are embedded in liquefiable soil medium. A finite-element code was developed in MATLAB to model three-dimensional soil-pile-structure systems. Frequency dependent Kelvin elements (spring and dashpots) were used to model the radiation boundary conditions. A work-hardening plastic cap model was used for constitutive modeling of the soil medium. The pore pressure generation for liquefaction was incorporated by a two-parameter volume change model reported in the literature. In this paper, a pile group in liquefiable soil is considered and a parametric study is conducted to investigate its seismic behavior. The effects of loading intensity and stiffness of the soil on the seismic behaviour of the soil-pile system are investigated, considering nonlinearity and liquefaction of the soil medium for a wide range of frequencies of harmonic excitations. The inertial interaction attributable to a structure is analyzed for a system consisting of a four-storied portal frame on the pile group-soil subsystem. The responses of the structure are investigated for harmonic excitation and transient excitations. The importance of consideration of nonlinearity and liquefaction of the soil medium for analysis and design of a pile-supported structure is highlighted. Results from an analysis considering a practical soil-pile problem are presented to demonstrate the applicability of the developed algorithm for a practical problem.
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Acknowledgments
The research presented here is supported by Department of Science and Technology, Govt. of India under Project UNSPECIFIEDNo. SR/S3/MERC/31/2005. This support is gratefully acknowledged. Authors would like to thank Prof. and Head, Dept. of Earthquake Engineering, IIT Roorkee for extending every possible help for smooth conduct of the research work.
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Published In
International Journal of Geomechanics
Volume 11 • Issue 4 • August 2011
Pages: 335 - 347
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Oct 10, 2009
Accepted: Aug 19, 2010
Published online: Jul 15, 2011
Published in print: Aug 1, 2011
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