高速铁路桥梁的隔震研究  

Study on Isolated High-Speed Railway Girder Bridge

作　　者：吴国斌[1] 谭平[1] 王冰[1] 马安财 

机构地区：[1]广州大学工程抗震研究中心,广州510405

出　　处：《华南地震》2016年第2期32-40,共9页South China Journal of Seismology

基　　金：国家自然科学基金高铁联合基金重点项目(U1334209);教育部创新团队项目(IRT13057)

摘　　要：以某高速铁路桥梁为工程背景,开展了高铁桥梁的隔震研究。针对该工程现已应用的摩擦摆支座的不足,研发了适用于高铁桥梁的四铅芯橡胶隔震支座,并与我国高速铁路常用的盆式橡胶支座进行了对比分析。采用ABAQUS软件对该工程中典型五跨简支高铁梁桥建立了三维精细化有限元分析模型,分析模型中摩擦摆式支座与四铅芯橡胶隔震支座均采用双线性来模拟,盆式橡胶支座采用水平刚度较大的线弹性模型,桥墩中混凝土和钢筋采用纤维模型。对比分析了高铁桥梁当分别采用摩擦摆式支座、四铅芯橡胶隔震支座与盆式橡胶支座时的地震响应。研究结果表明:采用的四铅芯橡胶隔震支座的高铁桥梁在大震下支座没有破坏且桥墩墩顶位移、墩底弯矩、墩底曲率均得到显著降低,能确保高铁桥梁在强震下的安全性。In order to improve the seismic safety of high-speed railway, the paper studies the typical practical high-speed railway girder bridge, introduces the seismic isolation technology. This paper presents a new isolation system, namely, rubber bearing with 4 lead cores, for the high-speed railway girder bridge. And different types of bearings are considered and simulated for comparison of seismic responses of high-speed railway girder bridge, including friction pendulum bearings and pot rubber bearings. The refined finite element model of a high-speed railway girder bridge with five spans is developed within the environment of ABAQUS. The bilinear model in analysis is used for friction pendulum bearings and lead rubber bearings, and the elastic model of largehorizontal stiffness is used for pot rubber bearings. Fiber model is used for concrete and steels. Responses of isolated high-speed girder bridge to a set of earthquake records are compared with those of the corresponding bridge with ordinary pot rubber bearings. The shear deformations of the presented LRBs are compared with those of the friction pendulum bearings. Research results show that the peak displacement of the pier-top, shear deformation, bending moment and curvature of the bottom of the bridge piers are reduced significantly in comparison with the bridge with ordinary pot rubber bearing. The presented isolation system can ensure the safety of high-speed railway girder bridge.

关 键 词：高速铁路 高速铁路梁桥 隔震 桥梁隔震 铅芯橡胶隔震支座 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]