A Numerical Study on Seismic Characteristics of Stepback Buildings considering SSI Effect

Abstract

From previous studies it is observed that seismic forces are affecting the behaviour of vertical irregular buildings. Stepback buildings are subset of these vertical irregular buildings. Many of these stepback buildings are constructed due to scarcity of level ground. Past studies reveal that, the stepback buildings failed vulnerably due to seismic effect. Further the effect of soil where these buildings founded also influences the failure of the buildings. Hence in this present study an attempt has been made to observe the behaviour of stepback buildings considering soil structure interaction (SSI) effect using Finite element analysis. Continuum modelling approach has been adopted to analyse these buildings resting on 20°, 25°and 30°ground slopes. Results such as resonance frequency and storey displacements are presented adopting time history analysis for both fixed base and flexible base condition