Nonlinear Analysis of Seismic Respond for Long-span PC Cable-stayed Bridge

Based on long-span bridge seismic analysis method,a spatial finite element model of cable-stayed bridge for dynamical analysis is established in this paper.The time history analysis for a long-span PC cable-stayed bridge is carried out with immediate integration method.The dynamic property and seismic response effects of geometric nonlinearities of the structure are calculated.According to design of the bridge,the difference dynamic property of two tower-girder connection types is compared.With some different seismic loads,the difference seismic response of the structure is compared.Considering pile-soil interaction,the difference seismic response of the structure is analyzed.The result shows that it must be considered pile-soil interaction in the seismic design of long-span cable-stayed bridge.There is a great deal of difference of calculations between the man-made seismic wave and actual seismic record of sites which are of similar environment.The worst loading condition in seismic calculation shall be taken into account.