STUDY OF SOIL STRUCTURE INTERACTION ON SEISMIC PERFORMANCE OF STEEL STRUCTURE

Civil Engineering

In order to study structural behavior under seismic excitation forces, it is prominent to study the effects of soil structure interaction (SSI). In present study, attempt have been made to study the influence of soil structure interaction on seismic behavior of steel structure considering two different bracing systems V and X bracing. Usually the structural behavior is analysed assuming the fixed support conditions at the base of structure. In conventional method, the foundation flexibility of soil mass is ignored which is likely to affect the structural response of building. The soil flexibility is integrated in the analysis of structure using Winkler’s spring model approach. For analysis G+11 multi storey steel building is considered with two different bracing arrangements. Three different soil strata’s i.e. hard, medium and soft are used for SSI study. The dynamic analysis is carried out in SAP2000 software using response spectra of IS 1893-2002. The effect of SSI on various parameters like base shear, natural time period, storey drift, storey displacement, etc are studied and discussed. To get real behavior of superstructure the sub-grade must be modeled adequately well. The study reveals that the SSI significantly affects the performance of the structure.

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