大跨径混合梁斜拉桥抗震体系及阻尼参数研究

摘要:

为研究大跨径混合梁斜拉桥在不同抗震体系与阻尼参数下的抗震性能,本文以主跨385m的京杭运河泗阳桃源大桥为背景,对比结构在纵桥向无连接装置、设置粘滞阻尼器、设置弹性索三种体系下的抗震能力,并进行了粘滞阻尼器与弹性索的设计参数敏感性分析,比较了不同参数下桥梁关键部位的地震响应变化,研究了不同体系下地震力传力路径。结果表明：选择合理阻尼参数与减隔震支座参数,可以大幅减小关键位置位移和关键构件内力,提高桥梁抗震性能。最后,给出了背景工程的合理设计参数,为同类型结构的抗震设计提供参考。

Abstract:

In order to study the long-span composite girder cable-stayed bridge under different seismic systems and with different damping parameters, this paper takes a 385m-span Siyang Taoyuan Bridge of Beijing-Hangzhou Canal as the background, compares seismic capacity of three systems: no-connection, with viscous dampers, with elastic cables. The seismic response changes under different parameters are compared and the seismic force transmission paths under different systems are studied. The results show that proper parameters of dampers and isolation bearings can greatly reduce the displacement and internal forces of key components, thus improve the seismic performance. Finally, the reasonable design parameters of the background bridge are given, which provides reference for the seismic design of the same type of structures.