Seismic Response Analysis of High-Rise Building Considering the Effect of Soil-Structure Interaction

Due to the increased urbanization and land scarcity, the demand for the construction of high-rise structures has been developed in areas with less than ideal geotechnical requirements in earthquake-prone regions. The traditional approach of seismic analysis of structures assumes that the structure is fixed at its base, omitting the effect of soil-structure interaction. Therefore, the current research intends to investigate the impact of soil-structure interaction on high-rise structures considering two different types of foundations rested on soft soil using a numerical tool SAP2000. The seismic analysis of a 25-storey building has been performed using the time history method under four real earthquake records including Bhuj, Northridge, Chi-Chi Taiwan, and the Kobe earthquakes, respectively. The results for the structure resting on the raft and pile foundation are compared and evaluated in terms of maximum displacement, inter-storey drift, column moments, and base shear. The findings of the research inferred that the seismic response with regard to the variation of maximum displacement of the structure supported on raft foundation under the impact of Northridge earthquake is increased by 67.5% compared with the structure supported on pile foundation. When SSI was taken into account, the inter-storey drift values surpassed the maximum permitted values of 0.4 percent under Northridge, Chi-Chi, and Kobe earthquakes. The maximum base shear forces of the structure under the impact of 2001 Bhuj earthquake sustained by the pile foundation significantly increased by 71% when compared with the base shear of the raft foundation.