基于粘滞阻尼器的大跨铁路斜拉桥横向减震研究

Research on Seismic Response Reduction of Cable-Stayed Bridge on Based on Viscous Damper Long-span Railway

以某铁路大跨斜拉桥为实际工程背景,研究了斜拉桥在过渡墩及辅助墩处横桥向合理的约束体系.通过大量的线性及非线性时程反应分析,研究了不同的约束体系下斜拉桥的地震反应特点.针对基于粘滞液体阻尼器的减震体系方案,对阻尼器的设置位置及力学参数进行了优化设计.研究结果表明:在过渡墩及辅助墩横向设置粘滞阻尼器的减震体系方案由于其它方案,该方案不仅可降低主塔横桥向的地震反应,还可显著降低过渡墩及辅助墩的桥墩,进而提高边墩桩基础的抗震性能.

Research on tranverse reasonable constraint way long-span cable-stayed bridge is presented. By system for auxiliary pier and transition pier on rail- conducting a large number of linear and non-linear time-history response analysis, the characteristics of seismic response for the cable-stayed bridge are stud- ied. Optimal design for layout and mechanical parameters of viscous dampers are performed in case of earth- quake-reduction system based on viscous dampers. The results show that the earthquake-reduction system is bet- ter than other systems by setting up viscous dampers between auxiliary pier, transition pier and girder, for tranverse seismic response of main tower, auxiliary pier and transition pier can be significantly reduced. Furthermore, seismic performance of pile foundations for auxiliary pier and transition pier can be improved.