铁路大跨度钢桁拱桥车-桥耦合振动研究  

Vehicle⁃Bridge Coupling Vibration Study of Railroad Long⁃Span SteelTruss Arch Bridge

作　　者：陈立 彭仪普[1] 于风晓 谭桢耀 CHEN Li;PENG Yipu;YU Fengxiao;TAN Zhengyao(School of Civil Engineering,Central South University Changsha,410075,China;Hunan Construction Engineering Group Co.,Ltd.Changsha,410029,China)

机构地区：[1]中南大学土木工程学院,长沙410075 [2]湖南建工集团有限公司,长沙410029

出　　处：《振动．测试与诊断》2024年第4期748-753,829,共7页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(52078499)。

摘　　要：为研究铁路大跨度钢桁拱桥车-桥耦合系统的动力响应,以南宁三岸邕江特大桥为工程背景,开展桥梁动载试验,测试该桥的自振特性、动位移和加速度。采用有限元软件ABAQUS与多体动力学软件SIMPACK联合仿真建立车-桥耦合振动模型,研究桥梁和列车在不同速度和单双线行车作用下的动力响应。结果表明:随着速度的增大,列车和桥梁的动力响应均增大;双线行车下桥梁的竖向位移和加速度大于单线行车,横向位移和加速度受车辆偏载作用的影响,双线工况下的结果小于单线工况,不同工况下主跨跨中的最大竖向和横向位移分别为17.234 mm和3.762 mm,最大竖向和横向加速度分别为0.589 m/s^(2)和0.213 m/s^(2),均满足我国的规范要求;单双线行车对列车的动力响应无明显影响,不同工况下,列车的脱轨系数、轮轴横向力、轮重减载率、车体振动加速度、Sperling指数均满足规范限值;桥梁整体性能较好,有足够的横向和竖向刚度,桥上运行列车有良好的安全性和平稳性。To study the dynamic response of the vehicle-bridge coupling system of railroad large-span steel truss arch bridge,the dynamic load test of the bridge is carried out to test the self-vibration characteristics,dynamic displacement and acceleration of the bridge with the Yongjiang Special Bridge as the engineering background.The finite element software ABAQUS and multi-body dynamics software SIMPACK are used for jointly simulating the vehicle-bridge coupling vibration model to study the dynamic response of the bridge and the train under the action of different speeds and single and double line traffic.Results show that the dynamic response of both the train and the bridge increases as the speed increases.In addition,the vertical displacement and acceleration of the bridge under two-lane traffic are larger than those under single-lane traffic,and the transverse displacement and acceleration are affected by the vehicle bias load.The results under two-lane conditions are smaller than those under single-lane conditions.The maximum vertical and lateral displacements in the main span under different working conditions are 17.234 mm and 3.762 mm,the maximum vertical and lateral accelerations are 0.589 m/s^(2)and 0.213 m/s^(2),all of which meet the code requirements in China.The dynamic response of the train is not significantly affected by the single and double line traffic,and the derailment coefficient,axle transverse force,wheel weight reduction rate,car vibration acceleration and Sperling index of the train under different working conditions meet the code limits.The overall performance of the bridge is favorable with sufficient transverse and vertical stiffness and the trains running on the bridge have good safety and smoothness.

关 键 词：桥梁工程 联合仿真 耦合振动 现场实测 钢桁拱桥 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] TH17[交通运输工程—道路与铁道工程]