Numerical Design and Analysis Isolated Single Span Pedestrian Bridge Under Seismic Load

Abstract

In recent time earthquake has been the most dangerous threat to structures. As Bangladesh has a high risk of facing earthquake it is necessary to ensure safety of the structures. Bridges are very vulnerable to earthquake ground motion. In this study a single span composite bridge is modelled with SAP 2000 and is analysed. The bridge is analysed without using isolators subjected to modified El Centro data for 15, 20 seconds. Nonlinear time history analysis was performed. Then this same bridge is analysed using a lead rubber bearing at one end of the bridge. The behaviour of the bridge is observed using isolators. From this analysis displacement vs time and acceleration vs time curves are found for different El Centro data. For base isolated and not isolated condition this results are compared. The comparison shows how seismically isolated condition can improve the response of bridge during earthquake.