Limit of considering dynamic soil-structure interaction

Abstract

This paper includes an investigation on a model test for dynamic soil-structure interaction, the approximate effective fundamental period and the limit of considering the dynamic soil-structure interaction. A frame model test with fixed-base and flexible-base is presented, and the approaches proposed in FEMA450 can reliably predict the influence of soil-structure interaction on fundamental period by comparing the test results and the calculated results. By using the approximate fundamental period of frame structure with fixed-base proposed in FEMA450, the methods of the approximate effective fundamental period are developed for foundations supported at the surface and embedded foundations, respectively. Then the limit of considering the dynamic soil-structure interaction is discussed, the effect of the depth of embedment is taken into account,and the rational limits are proposed.