Analysis of an Isolated Footing taking into account Soil Structure Interaction

Abstract

In the proposed study an attempt is made to understand the effect of soil interaction on the performance of building frames resting on isolated footing. The purpose of this study is to describe and investigate different approaches of considering the linear interaction analysis (SSI- Soil-Structure Interaction) with regard to the response in the superstructure. The present study is focused on SSI analysis of symmetrical space frame of 3 bays in both x and y direction, 2 storey (3X3X2), 3 bays in direction, 4 storey (3X3X4) and 3 bays in both direction, 6 storey (3X3X6) resting on isolated footing with fixed base. Medium hard clay type of soil is used for this SSI study. The interaction approach is incorporated in the analysis using Conventional analysis (NIA model - Non interaction analysis) and Soil-structure interaction analysis (LIA model - linear interaction analysis). ANSYS is used for developing these models. The effect of SSI on various structural parameters i.e. natural time period, base shear, roof displacement, beam moment and column moment and axial force are studied and discussed. The comparison is made between the approaches of conventional and liner interaction modeling. The study reveals that the SSI significantly affects the response of the structure.