基于车桥耦合振动的结合梁桥疲劳性能研究  

Fatigue Performance of Composite Girder Bridge Based on Vehicle-Bridge Coupling Vibration

作　　者：王思伟 陈双庆 宋晓东[3] WANG Siwei;CHEN Shuangqing;SONG Xiaodong(Hunan Design Institute Co.Ltd.,Changsha 410075,China;College of Civil Engineering and Architecture,Hunan University of Arts and Sciences,Changde Hunan 415000,China;China Railway Eryuan Engineering Group Co.Ltd.,Chengdu 610031,China)

机构地区：[1]湖南中大设计院有限公司,长沙410075 [2]湖南文理学院土木建筑学院,湖南常德415000 [3]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道建筑》2021年第11期34-38,共5页Railway Engineering

基　　金：湖南省交通运输厅科技进步与创新计划项目(202013)。

摘　　要：为了探讨列车振动对结合梁桥疲劳性能的影响,以一座客货共线铁路结合钢板梁桥为研究对象,采用车桥耦合分析方法计算得到CRH_(2)动车组和SS_(3B)+C_(70)货车通过桥梁时各轮对轮轨竖向力时程曲线;将轮轨力加载在精细化有限元模型中进行瞬态分析,对比了结合梁桥不同部位应力时程曲线;从最大应力幅和疲劳累积损伤两方面研究2种列车作用下结合梁桥关键节点的疲劳性能。结果表明:结合梁下翼缘节点的应力远大于上部节点的应力;CRH_(2)动车组作用下各截面分析点最大应力幅比较均匀,SS_(3B)+C_(70)货车作用下最大应力幅从支座到跨中呈逐渐增大的趋势;跨中附近横截面处的下翼缘与腹板相接角点比靠近桥梁支座附近的截面分析点更容易发生疲劳损伤;最大应力幅和最大疲劳累积损伤并不在同一横截面出现。In order to discuss the influence of vehicle vibration on the fatigue performance of composite girder bridge,a composite steel plate girder bridge of the mixed passenger and freight railway was taken as the research project.Based on the vehicle-bridge coupling analysis method,the vertical force time history curve of each wheel set and wheel rail when CRH_(2) electric multiple unit(EMU)and SS_(3B)+C_(70)freight train pass through the bridge was calculated.The wheel rail force was loaded in the refined finite element model for transient analysis,and the stress time history curves of different parts of the composite girder bridge were compared.The fatigue performance of key joints of composite girder bridge under the action of two kinds of trains was studied from the two aspects of maximum stress amplitude and fatigue cumulative damage.The results show that the stresses of the lower flange joints is much larger than those of the upper joints.Under the action of CRH_(2) EMU,the maximum stress amplitude of analysis point at each section is relatively uniform,while the maximum stress amplitude increases obviously from the bearing to the mid-span under the actions of SS_(3B)+C_(70)freight train.Fatigue damage is more likely to occur at the corner between the lower flange and the web near the mid-span than at the section analysis point near the bridge bearing.The maximum stress amplitude and the maximum fatigue cumulative damage do not appear in the same cross section.

关 键 词：结合钢板梁桥 客货共线铁路 疲劳性能 车桥耦合振动 轮轨力 瞬态分析 应力 

分 类 号：U448.216[建筑科学—桥梁与隧道工程]