基于实测数据的铁路钢桥列车荷载模型研究  

Study of Train Load Model for Railway Steel Bridge Based on Measured Data

作　　者：肖鑫[1] 刘晓光[2] 赵欣欣[2] 李旭伟[2] 

机构地区：[1]中国铁道科学研究院,北京100081 [2]中国铁道科学研究院铁道建筑研究所,北京100081

出　　处：《桥梁建设》2017年第6期60-65,共6页Bridge Construction

基　　金：中国铁路总公司科研开发计划项目(2015G006-J;2015YJ092)~~

摘　　要：为获得更为准确的铁路钢桥疲劳评估荷载,以某跨径75m的下承式单线简支铆接钢桁梁铁路桥为背景,基于实测数据,采用概率论的方法建立列车荷载模型。将列车模型分为列车类型、机车、车辆以及列车运行速度4个参数,通过统计分析,分别得到各参数的概率分布,采用Monte-Carlo法生成随机列车荷载。将模拟荷载计算的钢桥疲劳效应与实测值进行对比,结果表明:模拟的钢桥杆件日应力谱与实测日应力谱吻合良好,所建立的列车荷载模型能很好地描述列车荷载的通行情况,可用于铁路钢桥疲劳分析,具有较强的适用性。To acquire the m ore accurate fatigue assessm ent load for railw ay steel bridge, a 75mspan single-track sim ply-supported through railw ay riveted steel tru ss girder bridge was taken asan exam ple and the train load model w as established based on the m easured data, using the probabilitytheory m ethod. In the m odel, 4： param eters of the train type, locom otive, rolling stock andtrain traveling speed w ere incorporated and according to the statistical analysis, the probability distributionof the different param eters w as respectively acquired. T he random train load w as generated, using the M onte-C arlo m ethod and the fatigue effects of the steel bridge calculated by the sim ulationload w ere com pared to the m easured values. T he results dem onstrate that the sim ulateddaily stress spectra of the m em bers of the bridge are well agreeable w ith the m easured stress spectra.T he train load model established in this paper can represent very well the traveling conditionof the train load on the bridge. T he model is applicable to the fatigue analysis of the steel bridgeand has quite good applicability.

关 键 词：铁路桥 钢桥 列车荷载 概率模型 疲劳分析 MONTE-CARLO法 

分 类 号：U448.13[建筑科学—桥梁与隧道工程] U441.2[交通运输工程—道路与铁道工程]