Contact Interface Model for Shallow Foundations Subjected to Combined Cyclic Loading
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 135, Issue 3
Abstract
It has been recognized that the ductility demands on a superstructure might be reduced by allowing rocking behavior and mobilization of the ultimate capacity of shallow foundations during seismic loading. However, the absence of practical reliable foundation modeling techniques to accurately design foundations with the desired capacity and energy dissipation characteristics and concerns about permanent deformations have hindered the use of nonlinear soil–foundation–structure interaction as a designed mechanism for improving performance of structural systems. This paper presents a new “contact interface model” that has been developed to provide nonlinear relations between cyclic loads and displacements of the footing–soil system during combined cyclic loading (vertical, shear, and moment). The rigid footing and the soil beneath the footing in the zone of influence, considered as a macroelement, are modeled by keeping track of the geometry of the soil surface beneath the footing, along with the kinematics of the footing–soil system, interaction diagrams in vertical, shear, and moment space, and the introduction of a parameter, critical contact area ratio ; the ratio of footing area to the footing contact area required to support vertical and shear loads . Several contact interface model simulations were carried out and the model simulations are compared with centrifuge model test results. Using only six user-defined model input parameters, the contact interface model is capable of capturing the essential features (load capacities, stiffness degradation, energy dissipation, and deformations) of shallow foundations subjected to combined cyclic loading.
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Acknowledgments
This research work was supported by the Pacific Earthquake Engineering Research (PEER) Centers Program of the National Science Foundation (NSF) under Award No. NSFEEC-9701568 and PEER Project No. 2262001. Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the writers and do not necessarily reflect those of the NSF. The writers would like to acknowledge the suggestions and contributions of Ross Boulanger, Boris Jeremic, Geoff Martin, Tara Hutchinson, and Jonathan Stewart.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 135 • Issue 3 • March 2009
Pages: 407 - 419
Copyright
© 2009 ASCE.
History
Received: May 23, 2007
Accepted: May 15, 2008
Published online: Mar 1, 2009
Published in print: Mar 2009
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