Seismic response of a box bridge after reinforcement with prestressed CFRP textile

Abstract

ABSTRACTBy building the finite-element model before and after strengthening using pre-tensioned prestressed CFRP (carbon fibre-reinforced polymer) textile for different seismic waves, the box beam and pier of a four-span continuation box bridge in Tianshui City are strengthened, and the seismic performance of the prestressed concrete box bridge is studied. Considering the vertical and horizontal seismic loads, the dynamic time history of the entire bridge is modelled, and the effect of the pre-tensioned prestressed CFRP textile on the seismic performance of bridge is examined. The results show that the bending rigidity of the reinforced box girder increases. After strengthening with prestressed carbon fibre textile, the bridge can enhance the seismic resistance from vertical seismic waves by decreasing the vertical acceleration. Obviously, under horizontal seismic waves, after the box girder bridge is strengthened by the prestressed carbon fibre textile, the peak horizontal displacement and acceleration of the top of the pier decrease. Thus, the seismic response of the bridge can be effectively reduced after reinforcement with pre-tensioned prestressed CFRP textile.