Earthquake Response Analysis And Shock Absorption Design Of Cable-stayed Bridge

It is well known that the long-span bridge is one of the most important traffic lifeline projects, once destroyed, it will lead to huge economic lost, and heavily influence to the earthquake disaster reduction and repair of disaster areas damaged in an earthquake. Therefore the correct and effective designs of earthquake resistance and shock absorption are of great importance to the safety of cable-stayed bridges.In making shock absorption designs of cable-stayed bridge, the leading thinking is that, in the earthquake, the internal forces and displacement of the cable-stayed bridge are the smaller the better, however, under normal circumstances these two parties are often contradictory. Therefore if it is to make internal forces Reaction small, it often has to pay the cost of larger displacement, and vice versa.This paper, through large-scale finite element program ANSYS, establishes first system model of one floating power cable-stayed bridge,and makes analysis of dynamic structure characteristics and earthquake response. Analysis shows that the main bridge in the earthquake will have a greater vertical displacement, and should be controlled to ensure the seismic safety of bridges.And then another 2 calculation models, LRB used shock absorption and viscous dampers used shock damping, are established. Through modal analysis and comparison of the dynamic characteristics of the three models, it proceed to the earthquake-term schedule analysis, compared the damping effect of LRB and viscous dampers, and discussed the model of the design parameters of the damping effect to the change Impact. Finally it shows that, a reasonable choice of LRB and viscous dampers can both respond to the structure reduction of both displacement and internal forces in the same time, and improve the cable-stayed bridge seismic capacity and durability, which agrees with the idea of shock absorption design.and can be used as reference for other bridges seismic analysis and earthquake-reduction design.