Study on the effects of seismic soil-structure interaction of concrete buildings resting on hill slopes

Abstract

Due to the irregularity and asymmetry of the hill buildings, the centre of mass and the centre of stiffness of the buildings do not coincide and the buildings are subjected to greater shear and torsion. The present study is undertaken to observe the soil-structure interaction effect on a 4 storey RC building resting on hill slopes. The considered building rests on three different slopes. The ground slope is varied as 0⁰, 15⁰ and 27⁰. The considered buildings have been modelled and analysed in SAP2000 software. The considered building models are subjected to earthquake forces. A nonlinear static pushover analysis is performed on the considered building models. The results obtained from the analysis in terms of base shear and displacement at the performance point are then compared within the considered configurations of the building. It is observed that the response of the structure reduces to a much significant amount when the effect of soil-structure interaction is considered. Hence, it is concluded that the effect of soil-structure interaction must be considered while designing a building. By doing so, the structure can be designed for a much lower capacity resulting in an economical design.