Abstract: The main objective of this present investigation is to understand the seismic performance of superstructure considering the complex dynamic interaction between superstructures, the raft foundation resting on the soil and comparing the dynamic responses in cooperating soil flexibility with those of fixed base assumption, soil being idealized as modified Winkler model.
In the present study the behaviour of superstructure by modelling the nonlinearities of soil, modelling the interface between raft foundation and soil. To address this problem, a Finite Element Method is used to model soil structure interaction analysis of raft foundation supported framed structures by programming in SAP 2000 V14 software . An attempt has been made to evaluate the effect of soil structure interaction of super structure by considering the systematic parameters like time period, lateral displacement, storey drift, bending moment in X-X and Y-Y direction. Time history analysis has been carried out and the parameters like base shear and roof top displacement of the building frames resting over raft foundation and soil media has been studied.
Based on the analysis results, it has been concluded that the effect of soil-structure interaction plays a significant role to increase the time period, bending moment in X-X direction, bending moment in Y-Y direction, lateral displacement. As the flexibility of the soil increases the bending moment also increases. The study shows that, the SSI will affect the behavior of the structure, the structure-foundation-soil mass shows an effective approach.
Keywords: soil-structure interaction; Winkler model; Seismic response; SAP2000; time period; bending moment; Time history analysis.
Title: Study of Soil Structure Interaction Effect on Multi-Storey RC Frame Structures Resting Over Raft Foundation under Earthquake Caused Agitation
Author: Mr. Nitish Kumar S, Mr. Praveen J V
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
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