公铁平层宽幅钢箱梁桥面车致局部振动研究  

Research on Vehicle-induced Local Vibration of Wide Steel Box Girder Bridge Deck on Single-level Rail-cum-road Bridge

作　　者：何佳骏 谭伟 徐昕宇 李永乐[3] HE Jiajun;TAN Wei;XU Xinyu;LI Yongle(Southwest Municipal Engineering Design and Research Institute of China,Chengdu 610213,China;China Railway Eryuan Engineering Group Co.Ltd,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中国市政工程西南设计研究总院,成都610213 [2]中铁二院工程集团有限责任公司,成都610031 [3]西南交通大学土木工程学院,成都610031

出　　处：《铁道建筑》2023年第1期57-61,共5页Railway Engineering

摘　　要：公铁平层布置桥梁由于桥面板较宽,列车引起的桥面板局部振动可能影响公路车辆的响应。本文通过建立桥梁局部板壳单元有限元模型,分析列车荷载通过桥梁时的桥面板响应,讨论列车引起的局部振动在横桥向、纵桥向的分布以及对公路车道的影响。结果表明:列车轨道附近桥面板节点的竖向速度与加速度有显著提升,随着节点位置远离列车轨道,竖向响应迅速衰减;列车荷载作用下竖向响应影响范围约为列车中心线附近5 m的区域;列车通过桥梁时最靠近列车线路的公路车道响应频谱分析中并未观察到桥面板局部振动的高频部分,认为列车引起的局部振动对公路车辆的影响有限。Due to the wide bridge deck of single-level rail-cum-road bridge,the local vibration of bridge deck caused by trains may affect the response of road vehicles.In this paper,the finite element model of the local plate and shell element of the bridge was established to analyze the response of the bridge deck when the train load passed through the bridge,and the distribution of the local vibration caused by the train in the transverse and longitudinal directions of the bridge and its impact on the highway lane were discussed.The results show that the vertical velocity and acceleration of the bridge deck nodes near the track are significantly improved.With the node position away from the track,the vertical response decays rapidly.The train load affects the area of 5 m near the center line of the train.The high-frequency part of the local vibration of the bridge deck is not observed in the response spectrum analysis of the highway lane closest to the track when the train passes the bridge,so it is considered that the impact of the local vibration caused by the train on the road vehicles is limited.

关 键 词：公铁两用桥梁 局部振动 数值模拟 宽幅桥面 钢箱梁 

分 类 号：U448.12[建筑科学—桥梁与隧道工程]