Seismic Behavior of Frame-Wall-Rocking Foundation Systems. I: Test Program and Slow Cyclic Results
Publication: Journal of Structural Engineering
Volume 141, Issue 12
Abstract
The mechanism of foundation rocking has received much attention recently due to its appealing seismic resistant features, namely, self-centering tendency and energy dissipation capability. It is well recognized, however, that other inelastic mechanisms will contribute to a system’s seismic resistance. Considering the strength difference between a rocking footing and a shear wall structural fuse, and the system symmetry, six different two-story-two-bay frame-wall-foundation building models were constructed and tested in a geotechnical centrifuge. In this paper, the test program and experimental results when the models were subjected to slow cyclic loading are presented. A companion paper presents results from the dynamic phase of testing. Results indicate that, with the aid of foundation rocking, the system behaves in a ductile and stable manner with no strength degradation, even when the model is pushed to a drift of more than 2.5%. Importantly, when structural and foundation component strengths are approximately equal, the hysteretic energy is reasonably distributed among the superstructure inelastic components and the rocking foundations. Finally, numerical analyses predictions demonstrate comparable local and global response to measurements obtained during the experiments.
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Acknowledgments
The research program reported herein is financially supported by the National Science Foundation through the NEES research program under the award CMMI-0936503. Opinions, findings, and conclusions expressed are those of the authors and do not necessarily reflect the view of the sponsoring agency. The authors appreciate the suggestions and feedback provided by Professors Mark Aschheim and Sashi Kunnath. This test program would not have been possible without the assistance of staff members at the UC Davis NEES facility. Student assistants, including Dr. Mark Stringer, Kaijie Huang, and Keisuke Nagaura, also contributed their efforts during this test program. The third author (Andreas G. Gavras) was partially supported by an Alexander Onassis Foundation scholarship. The above support is gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 141 • Issue 12 • December 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: May 6, 2014
Accepted: Jan 6, 2015
Published online: Apr 10, 2015
Discussion open until: Sep 10, 2015
Published in print: Dec 1, 2015
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