Seismic response of high rise structure due to the interaction between soil and structure

In this paper the responses of the high rise structure due to the interaction between soil and structure are analysed. In this study, a 14 storeyed moment resisting building with 4 basement floors under different boundary conditions subjected to earthquake loading is analysed. Building is designed according to is 456 & is 800 codes and it is assumed to be located in seismic zone ii according to is 1893 2002 code. Both the structure & the soil are modelled & analysed using Etabs software and linear analysis is done using response spectrum method. Building is analysed under following different boundary conditions 1) fixed base without soil-structure interaction 2) fixed base with soil-structure interaction 3) pile foundation without soil-structure interaction.4) pile foundation with soil-structure interaction. Here results are focused on base shear, time period, storey drifts, and maximum storey displacement. Soil-structure interaction alters the response characteristics of a structure because of massive and stiff nature of structure and often soil softness. Due to this base shear, time period, storey drifts, and maximum storey displacement increased and also as depth of foundation increases all the above said response factors increases due the increase in contact area between soil and structure. Hencesoil-structure interaction effects need to be considered while designing buildings for its better performance.