Seismic response of concrete gravity dam reinforced with FRP sheets on dam surface

摘要

This paper aims at exploring the effects of anti-seismic reinforcement with the fiber-reinforced polymer(FRP) material bonded to the dam surface in dam engineering.Time-history analysis was performed to simulate the seismic failure process of a gravity dam that was assumed to be reinforced at the locations of slope discontinuity at the downstream surface,part of the upstream face,and the dam heel.A damage model considering the influence of concrete heterogeneity was used to model the nonlinearity of concrete.A bond-slip model was applied to the interface between FRP and concrete,and the reinforcement mechanism was analyzed through the bond stress and the stress in FRP.The results of the crack pattern,displacement,and acceleration of the reinforced dam were compared with those of the original one.It is shown that FRP,as a reinforcement material,postpones the occurrence of cracks and slows the crack propagation,and that cracks emanating from the upstream surface and downstream surface are not connected,meaning that the reinforced dam can retain water-impounding function when subjected to the earthquake.Anti-seismic reinforcement with FRP is therefore beneficial to improving the seismic resistant capability of concrete dams.