雄商高铁黄河特大桥纵向抗震体系设计研究  

Research on Longitudinal Seismic System of Xiong’an-Shangqiu High Speed Railway Extra⁃long Bridge

作　　者：李永兴 康银庚 刘凯 王江波 张上 LI Yongxing;KANG Yingeng;LIU Kai;WANG Jiangbo;ZHANG Shang(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《铁道建筑》2023年第9期59-64,共6页Railway Engineering

基　　金：中国国家铁路集团有限公司科技研究开发计划(N2022G066);中国铁路设计集团有限公司科技开发课题(2020YY340622)。

摘　　要：雄商高铁(雄安—商丘)黄河桥采用主跨(60+80+4×260+280+80+60)m的钢桁梁柔性拱桥,承载双线高速铁路,全桥纵向采用减隔震支座+黏滞阻尼器的减隔震方案,并设置纵向防落梁装置。由于主桥长度达1600 m,且桥墩数量多,因此地震作用下的非一致激励效应和不同桥墩位置处减隔震支座的减震差异性不可忽视。本文以该大桥为背景研究非一致激励地震作用以及双曲面减隔震支座的平面摩擦效应对高速铁路长联桥梁结构地震响应的影响,并给出减隔震支座、黏滞阻尼器和纵向防落梁的一体化抗震体系设计方案。结果表明:与一致激励地震相比,考虑非一致激励作用时支座的地震变形显著增加,最大位置处增加了1倍左右,而桥墩内力响应有小幅度下降;当不考虑双曲面减隔震支座的平面摩擦效应时,桥墩内力响应增加明显,其中高墩的墩底弯矩增加了40%左右。对于长联大跨度桥梁,可参考如下抗震设计原则:减隔震支座的变形需求考虑1/2支座的正常使用变形和支座地震变形的叠加。The Xiongan-Shangqiu high speed railway Yellow River Bridge is a flexible arch bridge that adopts a steel truss beam.As a double-track high speed railway bridge,the arrangement of the main spans is(60+80+4×260+280+80+60)m.The bridge is equipped with seismic isolation bearings and fluid viscous dampers(FVDs)to mitigate the seismic responses.Additionally,the longitudinal anti-falling beam devices are employed for safety consideration.Due to the length of the main bridge reaching 1600 m and the large numbers of bridge piers,the non-uniform excitation effect under earthquake action and the difference in seismic reduction difference of isolation bearings at different bridge pier positions cannot be ignored.This article takes the bridge as the background to study the influence of non-uniform excitation seismic action and the plane friction effect of double spherical seismic isolation bearing on the seismic response of high speed railway long unit bridge structures.Subsequently,an integrated seismic design scheme consists of isolation bearings,FVDS and anti-falling beam devices was proposed.The results show that compared with uniformly excited earthquakes,the seismic deformation of the bearing significantly increases when considering non-uniform excitation,with an increase of about twice at the maximum position,while the internal force response of the bridge pier decreases slightly.When the plane friction effect of double spherical seismic isolation bearing is not considered,the internal force response of the bridge pier increases significantly,with the bending moment at the bottom of the high pier increasing by about 40%.

关 键 词：铁路桥梁 长联桥梁 非一致激励 数值模拟 抗震体系 双曲面支座 地震响应 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]