Soil-Structure interaction effects on seismic response of a 16 storey RC framed building with shear wall

During earthquake the behavior of any structure is influenced not only by the response of the superstructure, but also by the response of the soil beneath. Structural failures in past have shown the significance of soil-structure interaction (SSI) effects. The present study focuses on SSI analysis of a symmetric 16 story RC frame shear wall building over raft foundation subjected to seismic loading. The transient analysis of structure-soil-foundation system is carried out using LS-DYNA software. Earthquake motion in time domain corresponding to zone III of IS 1893:2002 design spectrum is used to excite the finite element model of soil- structure system. For integrating the SSI effect, four types of soils based on shear wave velocity are considered. Responses in terms of variation in natural period, base shear and deflection obtained from the analysis of the SSI model are compared with that obtained from conventional method assuming rigidity at the base of the structure. The results show that the SSI effects are significant in altering the seismic response.