Research on Reasonable Longitudinal Constraint System for Large Span Single Tower Steel Box Beam Cable-stayed Bridges
The structure of long-span single-tower double-span steel box girder cable-stayed bridge is relatively flexible,so a reasonable constraint system scheme should be sought to improve the vertical stiffness of the structure and give consideration to its seismic performance.Based on a single-tower ca-ble-stayed bridge with a span of 240 m+240 m,the longitudinal force transmission mechanism was studied,and the static,dynamic and seismic performance parameters of the two-span single-tower and the auxiliary piers were analyzed under different longitudinal constraints.In addition,five longitudinal constraints of the two-span single-tower structural system were compared and selected.The results show that the problems of excessive longitudinal displacement and insufficient vertical stiffness of the main beam can be improved by using stronger longitudinal constraints.A longitudinal constraint sys-tem with limit shear and damper is proposed,and a reasonable value method of shear force is given.According to verification,the constraint takes into account the boundary requirements of static and seismic conditions under different stress states,which is an ideal longitudinal constraint system.
single tower cable-stayed bridgesteel box girderconstraint systemvertical stiffnessseismic analysis
万方数据
维普
