大跨度针形独塔斜拉桥抗震支座的比选分析

A Research of Selection Analysis of Aseismatic Bearing of Large-span Cable-stayed Bridge with Single Needle-shaped Pylon

针形独塔斜拉桥采用主梁和主墩固结、主塔塔底和主墩铰接的结构构造,使主墩及其基础的抗震设计变得非常复杂。详细分析主桥结构在边墩、过渡墩和辅助墩采用不同支座布置形式与不同支座刚度参数下的地震效应,得到采用速度锁定支座有利于主桥抗震的分析结论,有效解决主墩的抗震设计问题。

The cable-stayed bridge with single needle-shaped pylon adopts the structure with rigid connection between main girder & main pier and hinged connection between the pylon bottom & main pier, which will make aseismatic design of the main pier and its foundation very complicated. This paper has analyzed seismic effect of the main bridge structure in detail with different bearing layout & different bearing stiffness parameters of side pier, transition pier and auxiliary pier. The conclusions show that adopting lock-up bearings will benefit the anti-seismic performance of main bridge and resolve the aseismatic design issues of main pier.