Estimation of Seismic Force in Shear Walled Building Using Site Specific Response Spectrum

Abstract

Earthquakes are major natural disasters and increased seismic activity has attained greater importance for analysis of building considering seismic forces. Dynamic analysis is generally believed to provide the most realistic predictions of structural response induced by earthquake ground motions. The forces on building depend on peak ground acceleration and time period of building. Subsoil condition is responsible for the amplification of ground motion and amplification may increase or decrease the value of spectral acceleration coefficient. So, analysis using code specified response spectra may underestimate or overestimate seismic forces. An attempt has been made in this work to study the effect of site specific response spectrum on estimation of seismic forces on shear wall building. For site specific response spectrum analysis, response spectra are developed at seven sites of Ahmedabad. One dimensional equivalent linear approach based software ProSHAKE is used for development of response spectrum. Acceleration time history recorded at passport office building of Ahmedabad on 26th January 2001 Bhuj earthquake is considered as an input motion. The response of different multi–storied regular shear wall frame structures on various sites are obtained in terms of base shear and are compared with that obtained using IS 1893 specifications.