液压阻尼装置在斜拉桥抗震设计中的应用研究

以某斜拉桥为背景,研究液压阻尼装置的布置方案,通过比较减震前后该桥的地震响应,分析液压阻尼装置对大跨度斜拉桥的减震效果及液压阻尼装置的参数对减震效果的影响.采用动力时程分析方法,对比分析3种支撑体系,即漂浮体系、阻尼体系、铰结体系(锁定体系).研究表明,支撑体系对斜拉桥结构的地震响应有显著影响,设置液压阻尼装置能有效地减小大跨度斜拉桥结构塔、梁位移和内力响应.对液压阻尼装置的主要设计参数进行探讨,分析阻尼系数、速度指数对结构地震响应的影响,为大跨度斜拉桥的抗震设计提供理论依据,提出液压阻尼装置参数建议值.

Study of Application of Hydraulic Damping Device to Seismic Design of Cable-Stayed Bridge

Backgrounded by a long span cable-stayed bridge, the schemes for arrangement of the hydraulic damping device on the type of the bridge are studied. Through comparison of the seismic responses of the bridge before and after earthquake, the effect of the seismic mitigation of the bridge achieved by the damping device and the influence of parameters of the device on the seismic mitigation are analyzed. Three kinds of the supporting systems for the type of the bridge, i. e. the floating system, damping system and hinged (locked) system, are compared by the dynamic time history analysis method. The results of the study demonstrate that the supporting systems have significant influence on the seismic response of the structure of the bridge. The arrangement of the damping device can effectively reduce the displacement and internal force response of pylons and girder of the bridge. The principal design parameters of the damping device are also studied, the influences of the damping coefficients and velocity indices on the structural seismic response are analyzed. To provide the theoretic basis for the seismic design of the bridge, the proposed values for the parameters of the damping device are given.