Abstract
During an earthquake, the behaviour of any structure is affected not only by the superstructure response, but also by the response of the soil beneath. Recent structural failure patterns have indicated the significance of soil-structure interaction (SSI) effects. The present study focuses on SSI analysis considering the embedment depth of the foundation of a symmetric six stories reinforced concrete (RC)space bare frame building resting on stiff soil and subjected to seismic loading. The finite element analysis software ANSYS v17.2 is used. Time history (TH) analysis has been adopted. The Response in terms of lateral displacements, base shear forces, base moments and variation in natural time periods are calculated from the analysis of the soil foundation structure interaction (SFSI) model. Results are compared with that obtained from conventional method assuming rigid support at the base (fixed base) of the structure. The results show that the SFSI considering different embedment depths are significant in altering the seismic response of the multi-story building (MSB).
Highlights
During an earthquake, the behaviour of any structure is affected by the superstructure response, and by the response of the soil beneath
An extensive dynamic analysis to estimate the realistic performance level of a structure should consider the effects of soil foundation structure interaction (SFSI) on the model, the effect of soil-structure interaction (SSI) on the story lateral displacement of six stories building has been studied using three different embedment depths of the building, the lateral displacements with time history are presented in Fig.(7)
It is observed that the displacement increase occurs in SSI models, the displacement increases more from embedment depth of one story to embedment depth of three stories even though the embedment depth have increased as could be seen clearly from the Table (2).Many researchers indicated this like Janardhan [11], Nithya [12], he indicated that the low to mid rise buildings is mostly affected by SSI effects, the increased lateral displacement is due to soil flexibility
Summary
The behaviour of any structure is affected by the superstructure response, and by the response of the soil beneath. The Response in terms of lateral displacements, base shear forces, base moments and variation in natural time periods are calculated from the analysis of the soil foundation structure interaction (SFSI) model. The investigation methods include experimental and analytical studies, since, the experimental investigations are very expensive and time consuming [1], calibration of present computer models system and changing the base shear force depending on the dynamic characteristics of the soil the structural system and frequency content of the excitation motion [6], degree of influence of SSI on response of building depends on foundation system type, stiffness of ground and dynamic characteristics of building itself, that is, damping factor and natural period [5]
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