温度效应对铁路钢桥行车性能影响研究  

Temperature effect on running performance of steel railway bridge

作　　者：田园[1] 张楠[1] 孙奇[1] 杜宪亭[1] 夏禾[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《振动与冲击》2015年第12期94-100,共7页Journal of Vibration and Shock

基　　金：国家重点基础研究发展计划973项目(2013CB036203);高等学校博士学科点专项科研基金资助项目(20130009110036);中央高校基本科研业务费专项资金(2014YJS096)

摘　　要：日照作用所引起的温度效应使得铁路桥梁产生明显变形,进而影响行车安全性。为研究此问题,首先借助于ANSYS有限元软件的热-应力耦合技术进行桥梁温度场和位移场分析,以获得日照作用下的轨道变形。其中,桥梁热分析边界条件由热辐射、热对流、热传导等太阳物理学综合因素及相关经验公式确定;采用构件截面切分简化分析模型。然后,建立车桥耦合振动分析模型,将温度效应引起的梁体变形和轨道不平顺叠加效应作为系统激励,采用全过程迭代法求解系统响应。最后,以某铁路简支钢板梁桥为例进行车-桥动力计算,结果表明:日照作用下列车通过桥梁时,桥梁的加速度没有明显差异,但横向和竖向位移均有所增加,同时桥上行车安全性和舒适性均有所降低。The temperature effect induced by sunshine causes obvious deformation of railway bridges and affects the running safety of trains.In order to calculate the rail deformation,the temperature field and displacement field were analyzed making use of the heat-stress coupled technology of finite element software ANSYS,in which the boundary conditions of bridge in thermal analysis were determined based on some solar physics comprehensive factors of thermal radiation,heat convection and heat conduction and related empirical formulas.The component section segmentation was proposed in the model simplification.A train-bridge interaction system model was established.Taking the bridge thermal deformation and track irregularity as external excitations,the inter-system iteration method was used to solve the interacted system.As a case study,a typical simply-supported steel plate girder bridge was concerned to analyse the vehicle-bridge interaction.The results show that temperature effect has little influence on bridge accelerations when a train is passing through.However,the safety and comfort status become worse due to the increase of bridge horizontal and vertical deformation.

关 键 词：车桥耦合振动 温度效应 热分析 行车安全性 铁路钢桥 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]