SSI Analysis of Framed Structure Supported on Pile Foundations - With and Without Interface Elements

Abstract

In this paper an attempt has been made to understand the Soil Structure Interaction behavior of pile supported framed buildings under transient loading by taking the interface effects between the pile and soil. For this purpose a three dimensional Finite Element Method is used for modelling the soil-pile structure interaction using SAP 2000. A single bay five storey framed structure with a pile group foundation is modelled. First the significance of soil foundation structure interaction over fixed base analysis is studied, it has been observed that the presence of soil and foundation make a considerable change in response with a shift of natural period of the system. Next, a parametric study has been done to understand the significance of interface behaviour on soil foundation structure interaction. From the results it has been observed that under transient loading the acceleration response of top floor is reduced by two times, when contact between pile and soil has been modeled.