Response Spectrum Analysis of High-Rise Reinforced Concrete Framed Structure Resting on Raft and Pile Foundation System

Experiences from past earthquake witnessed spectacular collapse of high-rise reinforced concrete buildings in an over populated area with closely spaced structures. The present study investigates the effect of foundation types on seismic behavior of high-rise structures embedded in soft soil deposits using a numerical tool SAP2000. Firstly, the seismic analysis of the 25-storey reinforced concrete (RC) moment-resisting structure performed using response spectrum analysis as per IS 1893: 2016. Then, the seismic response of the superstructure is expressed in terms of maximum displacement, inter-storey drift (ISD), column moments, and base shear for the structure supported by raft and pile foundation are discussed and compared. This numerical study demonstrated that the type of foundation has a substantial effect on the seismic behavior of high-rise reinforced concrete structures considering soil-structure interaction.