高速铁路40m简支箱梁动力响应分析  

Dynamic Analysis of 40 m-Long Simply-Supported Spans for High-Speed Railway Bridge

作　　者：班新林 苏永华 高芒芒 李克冰 BAN Xin-lin;SU Yong-hua;GAO Mang-mang;LI Ke-bing(China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Infrastructure Inspection Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司,北京100081 [2]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [3]中国铁道科学研究院集团有限公司基础设施检测研究所,北京100081

出　　处：《桥梁建设》2020年第5期78-83,共6页Bridge Construction

基　　金：国家自然科学基金(U1934205);中国铁路总公司科技研究开发计划(K2018J020);中国铁道科学研究院科研项目(2017YJ023)。

摘　　要：为研究高速铁路40m简支箱梁桥在列车作用下梁体及车体的动力特性及影响因素,建立车-桥耦合动力分析模型,考虑不同的桥梁刚度、轨道不平顺和残余徐变,分析梁体跨中动挠度、竖向加速度,车体脱轨系数、轮重减载率、轮轨横向力、竖向加速度等动力特性。结果表明:梁体跨中动挠度和梁体竖向加速度受轨道不平顺幅值和残余徐变上拱幅值的影响较小;列车的脱轨系数、轮重减载率、轮轨横向力和车体竖向加速度受轨道不平顺幅值影响较大,各项指标最大值与高低不平顺幅值呈线性关系;残余徐变上拱幅值越大,轮重减载率和车体竖向加速度越大。When a train is passing the simply-supported box girder high-speed railway bridge with spans of 40 m,the girder and the train will exhibit different dynamic responses.To study the dynamic responses of the girder and the train and the influential factors,the train-bridge interaction model was established to analyze the midspan dynamic deflection and vertical acceleration of the box girder as well as the derailment coefficient,wheel weight reduction force,transverse force on tracks and vertical acceleration related to the train,taking into account different rigidity of the bridge,track irregularity and residual creep.The results indicate that track irregularity and creep deformation has minimal effect on the midspan dynamic deflection and vertical acceleration of the box girder,while track irregularity can significantly affect the derailment coefficient,wheel weight reduction rate,lateral forces on tracks and vertical acceleration of the train.The maximum value of each index is in linear relation with the track irregularity,meaning that larger residual creep deformation will lead to bigger wheel weight reduction rate and vertical acceleration of the train.

关 键 词：高速铁路桥 40m简支箱梁 动力特性 影响因素 桥梁刚度 轨道不平顺 残余徐变 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]