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Effect of Soil Structure Interaction on Seismic Response of Building




Soil Structure Interaction, Soil Stiffness, Infill Wall, Earthquake, Base Shear


Masonry infill wall panels may not contribute towards resisting gravity loads, but contribute significantly, in terms of enhanced stiffness and strength under earthquake (or wind) induced lateral loading. However, in practice, the infill stiffness is commonly ignored in building frame analysis, resulting in an under-estimation of stiffness and natural frequency. Also, the infill has energy dissipation characteristics that contribute to improved seismic resistance. Thus a reasonably accurate model for the soil-foundation-structure interaction system with computational validity, efficiency and accuracy is needed in the improved seismic design of structures. Most of the times, the effect of soil flexibility is not considered by structural designer with the feeling that such omission is conservative and simple, this could be true for static analysis but not for dynamic analysis. This omission is because of experimental and computational difficulties of the soil data and complicated modelling behaviour of substructure and superstructure. It is instructive to study the implications of the common practice of ignoring the infill stiffness with regard to performance under seismic loading. The present study makes an attempt to show the effect of flexibility and rigidity of foundation in earthquake analysis of structure by the considering the combined effect of soil structure interaction and infill wall stiffness of building. For superstructure G+3 simple rectangular building is considered for seismic analysis. The infill wall is replaced by equivalent diagonal member. The total work is divided into two parts. In first part, the manual analysis is done in which response spectra applied in both X (longitudinal) and Y (transverse)direction and in second part the analysis is done with ANSYS software considering soil structure interaction effect. The more emphasis is given on manual earthquake analysis by using model superposition response method as per IS 1893-2016 (part-I). The stiffness of soil is calculated by the formulae as per the FEMA 356. After studying this behaviour, it is found that base shear decreases in seismic analysis of superstructure by considering the effect of soil structure interaction in X (Longitudinal) and Y (Transverse) direction.

Other Details

Paper ID: IJSRDV6I100114
Published in: Volume : 6, Issue : 10
Publication Date: 01/01/2019
Page(s): 117-121

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