Inelastic Deformation of Extended Pile-Shafts
Publication: Journal of Engineering Mechanics
Volume 138, Issue 7
Abstract
Seismic performance of extended pile-shafts depends not only on the intensity of the earthquake ground motion, but also on the pile structural properties and the soil conditions surrounding the pile. For assurance of good foundation performance, damage can be controlled by limiting the curvature ductility demand in the yielding region of the pile. However, curvature ductility demand is influenced by the strength and stiffness of the pile and the soil, and the ability of the soil-pile system to distribute the inelastic deformation in the pile. The pile curvature distribution can be written in the form of a nonlinear differential equation, including the effects of the pile yielding, soil nonlinearity, and secondary moment arising from the axial load. A solution to the differential equation lends itself to the pile deflection, pile internal forces, soil pressure distribution, and, more importantly, the inelastic curvature distribution in the pile. The overall response in terms of a lateral force versus lateral displacement curve, and a kinematic relationship between the displacement ductility and curvature ductility factors, are computed as part of the solution. The proposed model is shown to provide good agreement with a finite-element model.
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Acknowledgments
The research presented in the paper was conducted as part of a collaboration between National Chung Hsing University and Y.H.C. in 2010. The generous support of National Chung Hsing University is appreciated.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 138 • Issue 7 • July 2012
Pages: 842 - 852
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Mar 15, 2011
Accepted: Dec 16, 2011
Published online: Dec 20, 2011
Published in print: Jul 1, 2012
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