Effect Of Soil Structure Interaction On Base Isolated Building Structure

Abstract

In this paper, a real 10-story base isolated structure, designed is selected .This study investigates the effect of soil–   structure interaction (SSI) on the response of base-isolated buildings. The equations of motion are formulated in the frequency domain, assuming frequency independent soil stiffness and damping constants. An equivalent fixed-base system is developed that accounts for soil compliance and damping characteristics of the base-isolated building. For preliminary design, the methodology can serve as a means to assess effective use of base isolation on building structures accounting for SSI. This study concludes that the effects of SSI are more pronounced on the modal properties of the system. The comparison of natural period, base shear and total relative displacements of the structure has been realized based on analytical models. such type of buildings Strategies proposed in this study are (i) increasing superstructure stiffness, (ii) increasing superstructure damping and (iii) increasing flexibility of isolation system.