轨道交通桥梁减隔震设计及验算研究  

Design,checking and calculation of seismic reduction and isolation for rail transit bridges

作　　者：吴长发 王雨权 蒋磊 WU Changfa;WANG Yuquan;JIANG Lei(China Railway Design Group Co.,Ltd.,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：《现代城市轨道交通》2024年第8期11-15,共5页Modern Urban Transit

基　　金：中国国家铁路集团有限公司科技研究开发计划项目(K2022G009)。

摘　　要：桥梁是轨道交通线路的重要组成部分。地震等自然灾害会对轨道交通桥梁造成严重破坏,从而影响轨道交通运输的安全性和可靠性,因此开展轨道交通桥梁减隔震设计研究具有十分重要的意义。为此,文章选取河北雄安新区至北京大兴国际机场快线跨南水北调天津干线的(75+128+75)m双线连续梁桥作为研究对象,进行减隔震设计和验算。首先,概述其减隔震设计,即所采用的双曲面球型减隔震支座的构造、本构模型、布置位置、参数取值等;然后,建立有限元计算模型,对上述减隔震设计进行验算,通过分析双曲面球型减隔震支座与球型普通支座的采用对结构受力及位移的影响,以确定设计的合理性;最后,计算结果表明,采用双曲面球型减隔震支座可大幅减小结构的地震响应,减震效果明显,能够达到抗震性能目标。Bridges are an important part of rail transportation lines.Natural disasters such as earthquakes can cause serious damage to rail transit bridges,thereby affecting the safety and reliability of rail transit transportation,so it is of great significance to carry out research on seismic reduction and isolation design of rail transit bridges.For this reason,this article selects the(75+128+75)m double-lane continuous girder bridge of the express line from Xiong'an New Area of Hebei province to Beijing Daxing international airport across the Tianjin main line of the South–North Water Transfer Project as the research object to carry out the seismic reduction and isolation design,checking and calculation.First,the seismic reduction and isolation design is summarized,i.e.,the structure,the intrinsic model,the deployment position,and the parameter values of the adopted hyperbolic spherical seismic reduction and isolation bearing;then,a finite element calculation model is established for the checking and calculation of the above seismic reduction and isolation design,and the effects of the adoption of the hyperbolic spherical seismic reduction and isolation bearing and the spherical ordinary bearing on the structural forces and displacements are analyzed to determine the reasonableness of the design;finally,the results of the calculations show that the application of hyperbolic spherical seismic reduction and isolation bearing can significantly reduce the seismic response of the structure,with obvious seismic reduction effect,and can achieve the seismic performance objectives.

关 键 词：轨道交通 桥梁 减隔震设计 双曲面球型减隔震支座 验算 

分 类 号：U24[交通运输工程—道路与铁道工程]