Demonstration of Compatible Yielding between Soil-Foundation and Superstructure Components
Publication: Journal of Structural Engineering
Volume 139, Issue 8
Abstract
Although the nonlinear behavior of rocking shallow foundations has been experimentally and numerically demonstrated as an effective tool to dissipate vibrational energy during seismic loading, the engineering community has yet to uniformly accept it as a targeted design mechanism for diffusing seismic energy in a structure. This paper presents results of a centrifuge test program that incorporated inelastic behavior into model building systems via yielding of both structural and foundation components. Three 2-story-1-bay building models were designed with similar layouts but different combinations of foundation and structural component yield strengths and were shaken with a similar suite of earthquake motions. Measurements of behavior of each of the model buildings are presented and cross-compared in terms of time history responses, hysteretic responses of the structural and foundation fuses, and maximum response parameters. A balanced design configuration, wherein the rocking foundation and structural fuse are intended to yield at approximately the same load, is demonstrated to be a well-controlled seismic-resisting system, with greatly reduced seismic ductility demand on the structural components. Moreover, seismic energy is well distributed among the targeted yielding components. In contrast, if the footing is restrained from rocking, the structural component ductility demand is significantly greater than that compared to its demand when the foundation is allowed to rock. In essence, the foundation rocking dominated model demonstrates its ability to protect the superstructure from seismic demands. In contrast, when the rocking foundation capacity is more than twice that of the structural fuse, rotations at the foundations are reduced significantly, at the price of much larger demands to the superstructure.
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Acknowledgments
The experimental investigation described herein is supported by the National Science Foundation NEESR program under Award No. CMMI-0936503. Assistance was provided by Dr. Lijun Deng, Christine Wittich, and Danielle Locklar throughout this test program. Assistance during testing was also provided by the staff at the University of California at Davis NEES facility and the University of California at San Diego Powell laboratory, including but not limited to Dr. Dan Wilson, Chad Justice, Anatoliy Ganchenko, Peter Rojas, Ray Gerhard, Lars Pedersen, and Stephen Porter. This support is greatly appreciated. Any opinions, findings, and conclusions expressed are those of the authors, and do not necessarily reflect those of the sponsoring organization.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 139 • Issue 8 • August 2013
Pages: 1408 - 1420
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Oct 21, 2011
Accepted: Apr 24, 2012
Published online: Apr 26, 2012
Published in print: Aug 1, 2013
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