Optimization of Longitudinal Seismic System for High Tower and Long Span Cable-stayed Bridges
In order to optimize the longitudinal seismic response system of a large-span cable-stayed bridge with a tower height exceeding 200 m,a double tower and double cable plane cable-stayed bridge with a span group of 54 m+131 m+370 m+131 m+54 m in Yunnan was taken as an engineering case.Its dynamic characteristics were calculated using finite element software,and nonlinear time-his-tory analysis was used to analyze the seismic response of key positions of the structure under three longitudinal seismic systems.The arrangement of viscous dampers was optimized.The results show that a cable tower exceeding 200 m reduces the overall stiffness of the bridge structure,and the tower top undergoes significant displacement under longitudinal seismic action.Placing viscous dampers with different parameters at the positions of tower beams and pier beams can effectively reduce the internal force and displacement at key positions of the structure,achieving good longitudinal seismic perform-ance.
high tower cable-stayed bridgelongitudinal earthquake resistanceseismic responsevis-cous damper
NETL
NSTL
万方数据
