Simplified Approach for the Seismic Response of a Pile Foundation
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 135, Issue 10
Abstract
Pseudostatic approaches for the seismic analysis of pile foundations are attractive for practicing engineers because they are simple when compared to difficult and more complex dynamic analyses. To evaluate the internal response of piles subjected to earthquake loading, a simplified approach based on the “ ” subgrade reaction method has been developed. The method involves two main steps: first, a site response analysis is carried out to obtain the free-field ground displacements along the pile. Next, a static load analysis is carried out for the pile, subjected to the computed free-field ground displacements and the static loading at the pile head. A pseudostatic push over analysis is adopted to simulate the behavior of piles subjected to both lateral soil movements and static loadings at the pile head. The single pile or the pile group interact with the surrounding soil by means of hyperbolic curves. The solution derived first for the single pile, was extended to the case of a pile group by empirical multipliers, which account for reduced resistance and stiffness due to pile-soil-pile interaction. Numerical results obtained by the proposed simplified approach were compared with experimental and numerical results reported in literature. It has been shown that this procedure can be used successfully for determining the response of a pile foundation to “inertial” loading caused by the lateral forces imposed on the superstructure and “kinematic” loading caused by the ground movements developed during an earthquake.
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Acknowledgments
Funding for this research was provided by DPC-Reluis Research UNSPECIFIEDGrant No. 6.4 “Deep Foundations.”
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 135 • Issue 10 • October 2009
Pages: 1440 - 1451
Copyright
© 2009 ASCE.
History
Received: Jan 19, 2007
Accepted: Feb 16, 2009
Published online: Apr 29, 2009
Published in print: Oct 2009
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