Influence of SSI on Period and Damping of Buildings Supported by Shallow Foundations on Cohesionless Soil
Publication: International Journal of Geomechanics
Volume 17, Issue 8
Abstract
This study investigates the influence of soil–structure interaction (SSI) on period and damping of steel moment-resisting frame buildings supported by shallow footings on dry sand deposits. A series of impact hammer tests were conducted on a 3-story and a 6-story model steel frame for this purpose. Different base conditions (e.g., loose and dense sand beds, surface and embedded footings, heavily loaded and lightly loaded footings) were considered to gain a complete understanding of inertial SSI effects. Experimental results were compared with FEMA provisions as well as with analytical results obtained from a finite-element model. The period and damping amplifications are more prominent in the case of the 3-story building than in that of the 6-story building, indicating more sensitivity of short and stiff buildings to SSI over the taller ones. For a heavily loaded 3-story building on loose sand, the period and damping amplifications are 21 and 330%, respectively. Although the analytical results match well with those of the experiment, FEMA provisions tend to overestimate the responses, especially for the 6-story building.
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Acknowledgments
The research is funded by the Department of Science and Technology (DST), India, under the Fast Track Grant for Young Scientists (Award SERB/F/0882/2013-2014). The aforementioned financial support is greatly appreciated. Any opinions, findings, and conclusions expressed in this paper are those of the authors and do not necessarily reflect those of the sponsoring organization. Technical advice and critical comments received from Dr. Samit Ray Chaudhuri (Associate Professor, Indian Institute of Technology Kanpur), Dr. Koushik Roy, and Gourab Ghosh (former graduate students, Indian Institute of Technology Kanpur) are highly appreciated.
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Published In
International Journal of Geomechanics
Volume 17 • Issue 8 • August 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Jun 25, 2015
Accepted: Nov 22, 2016
Published online: Mar 9, 2017
Published in print: Aug 1, 2017
Discussion open until: Aug 9, 2017
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