大跨度简支系杆拱桥抗震性能及减隔震方案研究  

Study on Seismic Performance and Seismic Isolation Scheme of Long-span Simple-supported Bowstring Arch Bridge

作　　者：余浩 YU Hao

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海市200092

出　　处：《城市道桥与防洪》2020年第8期280-283,M0026,M0027,共6页Urban Roads Bridges & Flood Control

摘　　要：大跨度简支系杆拱桥的上部结构自重大、墩柱刚度大,地震响应较大,需研究合适的减隔震措施。以一座大跨度简支系杆钢箱拱桥为背景,进行了动力特性分析,采用反应谱和动力时程方法分析了该桥的地震反应性能,识别了结构的易损部位。在大吨位支反力条件下选择了可适用的减隔震方案,采用非线性时程法比较了不同减隔震方案的效果。研究表明,采用黏滞阻尼器或摩擦摆支座方案的减隔震效果显著。The superstructure of long-span simple-supported bowstring arch bridge is greatly self-heavy and its pier column has great stiffness.As the seismic response is high,it is required to study the proper seismic isolation measures.Taking a long-span simple-supported bowstring arch bridge as an background,its dynamic characteristics are analyzed.The response spectrum method and dynamic time-history method are used to analyze the seismic response properties of this bridge,and identify the damageable parts of its structure.Under the condition of large-tonnage support reaction,the applicable seismic isolation scheme is selected.The effects of the different seismic isolation schemes are compared by the nonlinear time-history method.The results show that the application of viscous damper or friction pendulum bearing schemes has the obvious effect of seismic isolation.

关 键 词：大跨度钢拱桥 简支系杆拱桥 抗震性能 减隔震 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]