超250m级高塔铁路斜拉桥减隔震设计参数影响分析  

Influence analysis of vibration isolation design parameters of over 250 m high tower railway cable-stayed bridge

作　　者：董俊 曾永平[2] 张金 黄树强 宋晓东[2] DONG Jun;ZENG Yongping;ZHANG Jin;HUANG Shuqiang;SONG Xiaodong(Sichuan College of Architectural Technology,Deyang 618000,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]四川建筑职业技术学院,四川德阳618000 [2]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《铁道科学与工程学报》2022年第7期1963-1976,共14页Journal of Railway Science and Engineering

基　　金：高速铁路基础研究联合基金资助项目(U1934207);中国中铁股份有限公司科技研发计划资助项目(2017-重点-6)

摘　　要：为了研究西南山区超250 m级高塔大跨铁路斜拉桥抗震约束体系,获得大桥减隔震关键设计参数合理取值范围,以跨径布置(70+208+500+208+70)m的双线铁路钢桁梁斜拉桥为工程背景,采用有限元分析方法,研究大桥地震响应特征,分析塔梁处设置不同纵向弹性刚度时大桥动力特性和结构地震响应规律,探讨黏滞阻尼器设计参数对大桥各关键构件地震响应的影响规律。研究结果表明:这类超250 m级高塔铁路斜拉桥设置黏滞阻尼器是十分有必要的。在塔梁、墩梁位置处同时设置黏滞阻尼器可以有效控制超250 m级高塔铁路斜拉桥的梁端位移,明显改善超高塔自身的地震力分布情况。研究得到的大桥地震响应随黏滞阻尼器设计参数的变化规律,以及适用于超高塔铁路斜拉桥的合理阻尼器设计参数,可为今后类似工程提供参考依据。This paper studied the seismic restraint system of over 250 m high tower and long span railway cable stayed bridge in southwest mountainous area,and obtained the reasonable value range of the key design parameters of the bridge.Taking the double-track railway steel truss girder cable-stayed bridge with span layout(70+208+500+208+70)m as the engineering background,the finite element analysis method was used to analyze the dynamic characteristics of the bridge and the seismic response of the structure with different longitudinal elastic stiffness at the pylon and beam.The influence of design parameters of viscous dampers on seismic performance of key components of the bridge were studied.The results show that the viscous dampers at the pylon beam and pier beam positions can effectively control the beam end displacement of the over 250 m tower cable-stayed railway bridge,and the seismic force distribution of the super high tower can be improved obviously.It is very necessary to install viscous dampers for such over 250 m high tower railway cable-stayed bridges.The variation law of the seismic response of the bridge with the design parameters of the viscous damper is obtained,and the reasonable design parameters of the damper suitable for the cover high tower cable-stayed railway bridge are proposed.The research results can provide reference for similar projects in the future.

关 键 词：桥梁工程 超高桥塔 铁路斜拉桥 抗震性能 设计参数 

分 类 号：U448.23[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]