大跨长联钢桁结合梁桥减隔震方案设计及技术指标对比

Seismic isolation scheme design and comparison of technical indexes of long-span steel truss girder bridge

以济南长清黄河大桥为背景,结合大跨长联的结构特点,提出三种减隔震设计方案。对三种减隔震方案分别做了动力参数敏感性分析、最优动力设计参数的确定、三种装置的减隔震效果分析和经济性对比,得出大跨长联连续梁桥设置减隔震支座个数并不是设置的越多越好,而是要结合支座位移综合比选后确定。本项目最终确定采用双曲面摩擦摆减隔震支座方案。

Taking the Changqing Yellow River bridge in Jinan as the background,combined with the structural features of large-span and long-link,three design schemes for seismic isolation reduction are proposed,the sensitivity analysis of dynamic parameters of three seismic isolation schemes,the determination of optimal dynamic design parameters,the analysis of seismic isolation effect and the economic comparison of the three devices are carried out. It is concluded that the number of shock absorber bearings is not the more the better,and should be combined with the bearing displacement comprehensive ratio after selection.This project finally is decided to adopt hyperboloid friction pendulum damping vibration isolation support scheme.