SHAKE TABLE STUDY OF SOIL STRUCTURE INTERACTION EFFECTS ON SEISMIC RESPONSE OF SINGLE AND ADJACENT BUILDINGS

摘要

The objective of this paper is to evaluate the Soil-Structure-Interaction (SSI) effects in dynamic response of single and adjacent building structures. For this purpose, Experimental testing have been carried out using a ground model specimen made of relatively soft soil and four steel building models of 5, 10, 15, and 20 stories. The combined system of Soil-Foundation-Structure models subjected to horizontal component of two real earthquake records generated by shaking table. From the test results it can be concluded that the effect of kinematic interaction is negligible in comparison with inertial interaction. In lower buildings, the horizontal and rocking motions of foundations are the main causes of soil-structure interaction. By increasing the height of buildings, a major manifestation of SSI is a contribution of the rocking motion of the foundation. The cross-interaction has not significant effect in changing of resonance frequency of adjacent buildings.