城市轨道交通荷载作用下连续箱梁桥动力测试与仿真分析  

Dynamic test and simulation analysis of continuous box girder bridge under urban rail transit load

作　　者：李慧乐 李林杰[4] 葛健 王天宇 吴刚 刘钊[1,3] LI Huie;LI Linjie;GE Jian;WANG Tianyu;WU Gang;LIU Zhao(Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education,Southeast University,Nanjing 211189,China;National and Local Joint Engineering Research Center for Intelligent Construction and Maintenance,Southeast University,Nanjing 211189,China;School of Civil Engineering,Southeast University,Nanjing 211189,China;Railway Engineering Inspection Co.,Ltd.,Beijing 100081,China)

机构地区：[1]东南大学混凝土与预应力混凝土结构教育部重点实验室,江苏南京211189 [2]东南大学智慧建造与运维国家地方联合工程研究中心,江苏南京211189 [3]东南大学土木工程学院,江苏南京211189 [4]铁科检测有限公司,北京100081

出　　处：《铁道科学与工程学报》2023年第12期4625-4635,共11页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51708112,52127813);国家重点研发计划项目(2020YFC1511900);江苏省交通运输科技项目(2021Y15)。

摘　　要：混凝土连续箱梁桥在城市轨道交通中得到越来越多的应用,针对地铁列车-连续梁桥耦合系统动力性能的研究有助于保障城市轨道交通的运营安全。以一座跨市域轨道交通(50+82+50)m变截面混凝土连续箱梁桥为工程背景,开展桥梁动力试验获取结构自振特性和地铁列车作用下的振动响应。建立地铁列车-连续梁桥耦合系统的动力分析模型并编制计算程序,通过对比数值分析与现场测试的结果验证耦合系统模型的有效性。采用经验证的车桥模型进行动力仿真,计算分析了不同运营条件下车桥系统的动力响应及行车安全性与平稳性指标。动力测试与仿真分析结果表明,所建立的地铁列车-连续梁桥耦合振动模型能够真实反映车桥系统的动力性能,可用于城市轨道交通大跨连续梁桥的车桥耦合动力分析。三跨变截面混凝土连续箱梁桥具有较好的动力性能,结构横、竖向刚度较大,正常运营条件下的车桥响应及列车走行性指标均较小。车速可影响车辆、桥梁振动响应及列车走行性,但对桥梁跨中的动挠度影响较小。轨道状态对车桥系统的动力性能有显著的影响,且随着车速的提高影响加剧。当轨道平顺性大幅下降时,120km/h车速下轮重减载率和竖向Sperling指标出现超限的情况。研究结果可为城市轨道交通大跨连续箱梁桥的动力设计与运营维护提供参考。Continuous concrete box girder bridges are increasingly being applied in urban rail transit.The investigation of dynamic performance of the coupled metro train-continuous girder bridge system can assist in ensuring the operation safety of urban rail transit.A(50+82+50)m continuous concrete box girder bridge with variable cross-sections in an inter-city rail transit was taken as the engineering background,and bridge dynamic test was carried out to obtain natural vibration characteristics and vibration responses of the structure under metro train.The dynamic analysis model of coupled metro train-continuous girder bridge system was established and the computation procedure was developed.The effectiveness of the coupled system model was verified by comparing the numerical analysis and field test results.Based on the validated train-bridge model,dynamic simulation was performed.Dynamic responses of the train-bridge system and indices of train running stability and safety were calculated and analyzed under various operating conditions.Dynamic test and simulation analysis results show that the developed coupling vibration model of metro train and continuous girder bridge system can truly reflect the dynamic performance of the train-bridge system,and thus it can be adopted in the train-bridge coupling dynamic analysis of large-span continuous girder bridges in urban rail transit.The three-span continuous concrete box girder bridge with variable cross-sections has superior dynamic performance,and large transverse and vertical stiffness.Train-bridge system responses and train running performance indices are insignificant under normal operating conditions.The vehicle speed can affect the vibration responses of vehicles and bridges and the running performance of trains,but it has little influence on the dynamic deflection of bridge mid-span.The track state has a considerable effect on the dynamic performance of the train-bridge system and such an effect increases with vehicle speed.When the track smoothness is greatly reduce

关 键 词：跨市域轨道交通 连续箱梁 车桥耦合振动 动力试验 仿真模拟 

分 类 号：U448[建筑科学—桥梁与隧道工程]