Physical Modeling of Seismic Soil-Pile-Structure Interaction for Buildings on Soft Soils
Publication: International Journal of Geomechanics
Volume 15, Issue 2
Abstract
The present research intends to study the effects of the seismic soil-pile-structure interaction (SSPSI) on the dynamic response of buildings with various heights by conducting a series of shaking table tests on 5-, 10-story, and 15-story model structures. Two types of foundations for each case are investigated, including (1) a fixed-base structure, representing the situation excluding the soil-structure interaction; and (2) a structure supported by an end-bearing pile foundation in soft soil. An advanced laminar soil container has been designed that uses three-dimensional numerical modeling to minimize the boundary effects and to simulate free-field motion during the shaking table tests. Four real earthquake events, including Kobe 1995, Northridge 1994, El Centro 1940, and Hachinohe 1968, are imposed to each model. According to the experimental measurements, it is observed that the SSPSI amplifies the maximum lateral deflections and in turn interstory drifts of the structures supported by end-bearing pile foundations in comparison with the fixed-base structures. The rocking component plays an important role in increasing the lateral deflection of the superstructures, which can shift the performance level of the structures to near collapse or even collapse levels and as a result should be assessed precisely in the seismic design of buildings resting on soft soils.
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Published In
International Journal of Geomechanics
Volume 15 • Issue 2 • April 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jun 24, 2013
Accepted: Feb 25, 2014
Published online: Apr 11, 2014
Published in print: Apr 1, 2015
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