高烈度地区大跨双层高架桥减隔震技术研究与应用  

Research and application of seismic isolation techniques to double-deck viaducts with large span in higher intensity areas

作　　者：张国忠 Zhang Guo-zhong(Guangdong Provincial Railway Planning and Design Institute Co.Ltd,Guangzhou 510006,China)

机构地区：[1]广东省铁路规划设计研究院有限公司,广东广州510006

出　　处：《工程抗震与加固改造》2024年第6期43-51,共9页Earthquake Resistant Engineering and Retrofitting

摘　　要：以某大跨径双层高架桥为背景,针对高烈度地区大跨径双层连续梁抗震设计存在的难题,提出了铅芯橡胶支座与黏滞阻尼器的组合减隔震技术方案和摩擦摆支座的减隔震方案,研究了2种方案的优劣性。采用有限元软件Midas/Civil建立了该桥的减隔震设计模型,通过非线性时程分析法进行了地震响应分析。研究结果表明:相较于传统抗震方案,2种减隔震方案中墩的墩底弯矩减震率分别为65%~75%和69%~72%,中墩墩底剪力减震率分别为68%~73%和56%~71%,且墩梁间相对变形得到释放,桥墩处于弹性阶段。减隔震技术方案均能有效降低E1、E2地震作用下桥墩的内力响应,通过对比2种减隔震方案的优缺点,结合双层连续梁高架桥的结构特点,宜优先选择摩擦摆支座隔震体系进行抗震设计。Based on a long-span double-deck viaduct,the combination isolation technology scheme of lead rubber bearing and viscous damper and the isolation technology scheme of friction pendulum bearing are proposed to solve the difficulties in high seismic intensity,and the advantages and disadvantages of the isolation technology scheme are studied.The seismic mitigation and isolation design model of the bridge is established by using the finite element software Midas/Civil,and the seismic response analysis is conducted by using the nonlinear time history analysis method.The research results show that compared with the traditional seismic bridge,the seismic mitigation ratio of the moment at the bottom of the middle pier is 65%to 75%and 69%to 72%respectively,and the seismic mitigation ratio of the shear force at the bottom of the middle pier is 68%to 73%and 56%to 71%respectively.The relative deformation between the piers and beams is released,and the piers are in the elastic stage.Seismic mitigation and isolation technology schemes can effectively reduce the internal force response of bridge piers under E1 and E2 earthquake.Considering the structural characteristics of the double deck continuous beam bridge,the friction pendulum bearing isolation system should be preferred for seismic design after comparing the advantages and disadvantages of the two isolation solutions.

关 键 词：大跨双层连续梁桥 抗震设计 减隔震技术 摩擦摆支座 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U448.28[交通运输工程—道路与铁道工程]