Rocking Effect of a Mat Foundation on the Earthquake Response of Structures
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 141, Issue 1
Abstract
To evaluate the effect of soil-foundation interaction on the earthquake response of structures, centrifuge tests were performed using an in-flight earthquake simulator. The test specimen was composed of a single-degree-of-freedom structure model, a shallow foundation, and subsoil deposits in a centrifuge container. The test parameters were the dynamic period of the structure model, the centrifugal acceleration level, and the type and level of input earthquake accelerations. The test results showed that the lateral forces of the structures were limited by the soil-bearing strength (i.e., ultimate moment capacity of the foundation) and the damping effect owing to the rocking motion of the foundation. Thus, even when the periods of the structures were close to the site periods, the lateral forces did not significantly increase. However, it should be noted that, because of the damping effect of the foundation, the maximum seismic lateral load of the structures exceeded the load statically determined by the soil-bearing strength. This issue should be addressed for the safe design of structures and members. In this test, the maximum damping ratio for rocking due to the rocking motion was estimated to be 0.31.
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Acknowledgments
This work was supported by the National Research Foundation of Korea (NRF) grant (2010-0027593) funded by the Korean government’s Ministry of Education, Science and Technology.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 141 • Issue 1 • January 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Dec 24, 2013
Accepted: Sep 2, 2014
Published online: Sep 25, 2014
Published in print: Jan 1, 2015
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