Seismic Response of Retrofitted Low Rise Structure under Strong Earthquakes Using Nonlinear Time History Analysis

Abstract

This paper summarizes the response quantities of existing and retrofitting for three story reinforced concrete (RC) structure under selected seismic excitation. The retrofitting technique addressed in this study include carbon fiber reinforced polymer (CFRP) bar strengthening on beam, steel cage column jacketing, high strength concrete column jacketing, CFRP strengthening of column, and applying the base isolation technique. To evaluate the effect of seismic excitation on the structural responses, three ground motion records, i.e., Newhall, Northridge and Sylmar are selected and scaled to match response spectra design of Indonesian code. Material non-linearity was taken into account and modelled as plastic hinges at the both end of columns and beams element. Nonlinear time history analyses were performed using Newmark's integration method for existing and all retrofitting models. Finally, the comparisons of the response quantities in term of base shear, roof acceleration, story drift index are presented and discussed.