桥梁刚度变化对高速铁路独塔斜拉桥车⁃桥耦合振动的影响分析  

Analysis of the Influence of Bridge Stiffness Changes on the Vehicle-bridge Coupling Vibration of Single Tower Cable-stayed Bridge in High⁃speed Railway

作　　者：李波[1,2] Li Bo(Engineering Research Center of Railway Industry on Digital and Intelligent Survey and Design System,China Railway Siyuan Survey and Design Group Co.,Ltd.,Hubei,Wuhan 430063,China;Digital Intelligence Business Unit,China Railway Siyuan Survey and Design Group Co.,Ltd.,Hubei,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司数智化勘察设计系统铁路行业工程研究中心,湖北武汉430063 [2]中铁第四勘察设计院集团有限公司数智化事业部,湖北武汉430063

出　　处：《铁道技术标准（中英文）》2024年第2期19-26,共8页Railway Technical Standard(Chinese & English)

基　　金：国家重点研发计划(2021YFB2600400);中国铁建股份有限公司科技研发计划(2022-A02);中铁第四勘察设计院集团有限公司科技研发项目(2022D001)。

摘　　要：以高速铁路独塔斜拉桥为研究对象,建立车-轨-桥耦合系统的空间多体动力学分析模型,开展高速铁路斜拉桥的车-轨-桥耦合振动的仿真分析。通过改变材料弹性模量的方式调整桥塔和主梁刚度,研究桥梁刚度变化对桥梁车-桥-耦合振动的影响规律。研究结果表明,随着桥塔刚度的增大,主梁跨中竖向和塔顶纵向位移响应逐渐减小,其峰值减幅分别为7.57%和10%;随着主梁刚度的减小,主梁跨中竖向位移和塔顶纵向位移峰值呈逐渐递增趋势,主梁刚度变化对车体竖向加速度和Sperling竖向舒适度指标影响相对较大;相比于桥塔刚度的变化,主梁刚度变化对车-桥振动响应的影响更大;整体上,列车运行的安全性和平稳性指标满足规范要求。Taking the high⁃speed railway single tower cable⁃stayed bridge as the research object,a spatial multi⁃body dynamic analysis model of the train⁃track⁃bridge coupling system was established,and simulation analysis of the vehicle⁃track⁃bridge coupling vibration of the high⁃speed railway cable⁃stayed bridge was carried out.By adjusting the stiffness of bridge towers and main beams through changing the elastic modulus of materials,the influence of bridge stiffness changes on the vehicle⁃bridge coupling vibration was studied.The research results show that as the stiffness of the bridge tower increases,the vertical displacement response at the mid span of the main beam and the vertical displacement response at the top of the tower gradually decrease,with a peak reduction of 7.57%and 10%,respectively.As the stiffness of the main beam decreases,the peak vertical displacement at the mid span of the main beam and the vertical displacement at the top of the tower gradually increase.The change in stiffness of the main beam has a considerable impact on the vertical acceleration of the vehicle body and the Sperling vertical comfort index.Compared to changes in the stiffness of the bridge tower,changes in the stiffness of the main beam have a greater impact on the vibration response of the vehicle⁃bridge coupling system.Overall,the safety and stability of train operation meet the specification requirements.

关 键 词：高速铁路 独塔斜拉桥 车-桥耦合振动 桥梁刚度 动力分析 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]