Capacity, Settlement, and Energy Dissipation of Shallow Footings Subjected to Rocking
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 134, Issue 8
Abstract
The effectiveness of structural fuse mechanisms used to improve the performance of buildings during seismic loading depends on their capacity, ductility, energy dissipation, isolation, and self-centering characteristics. Although rocking shallow footings could also be designed to possess many of these desirable characteristics, current civil engineering practice often avoids nonlinear behavior of soil in design, due to the lack of confidence and knowledge about cyclic rocking. Several centrifuge experiments were conducted to study the rocking behavior of shallow footings, supported by sand and clay soil stratums, during slow lateral cyclic loading and dynamic shaking. The ratio of the footing area to the footing contact area required to support the applied vertical loads , related to the factor of safety with respect to vertical loading, is correlated with moment capacity, energy dissipation, and permanent settlement measured in centrifuge and 1 model tests. Results show that a footing with large ratio (about 10) possesses a moment capacity that is insensitive to soil properties, does not suffer large permanent settlements, has a self-centering characteristic associated with uplift and gap closure, and dissipates seismic energy that corresponds to about 20% damping ratio. Thus, there is promise to use rocking footings in place of, or in combination with, structural base isolation and energy dissipation devices to improve the performance of the structure during seismic 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. This work could not have been accomplished without the extensive assistance of Chad Justice, Tom Coker, and Tom Kohnke, and the entire staff of the UC Davis Center for Geotechnical Modeling. The writers would like to acknowledge the suggestions and contributions of Geoff Martin, Tara Hutchinson, Jonathan Stewart, Ross Boulanger, Boris Jeremic, Dan Wilson, Key Rosebrook, Justin Phalen, and Jeremy Thomas.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 134 • Issue 8 • August 2008
Pages: 1129 - 1141
Copyright
© 2008 ASCE.
History
Received: Feb 15, 2007
Accepted: Nov 16, 2007
Published online: Aug 1, 2008
Published in print: Aug 2008
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