Application of Structural Damage Control in Seismic Performance Opti- mization of Long-span Cable-stayed Bridge

The damage caused by earthquake is irresistible for human beings, and the structure with poor robustness is most affected by earthquake. Especially when traffic arteries like bridges and highways are affected, the losses will be unimaginable. To reduce the loss in earthquake, the paper targets the long-span cable-stayed bridge and discusses a method of structural damage control. The energy-dissipation auxiliary pier structure can protect the bridge under strong shock, which has an important realistic significance for reducing losses of the bridge. The model of auxiliary pier is built in the paper. Through the experiment, many aspects including destructive process, hysteretic characteristics, ductility and hysteretic energy, equivalent viscous damping ratio and deforming capacity of energy-dissipation construction are analyzed. Structural damage control can well enhance the safety of bridge. The internal force and displacement of main components can be reduced correspondingly, and thus the safety of long-span cable-stayed bridge is well protected.