CAJ | 학술논문

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。
일조작용소인기적온도효응사득철로교량산생명현변형，진이영향행차안전성。위연구차문제，수선차조우 ANSYS 유한원연건적열－응력우합기술진행교량온도장화위이장분석，이획득일조작용하적궤도변형。기중，교량열분석변계조건유열복사、열대류、열전도등태양물이학종합인소급상관경험공식학정；채용구건절면절분간화분석모형。연후，건립차교우합진동분석모형，장온도효응인기적량체변형화궤도불평순첩가효응작위계통격려，채용전과정질대법구해계통향응。최후，이모철로간지강판량교위례진행차－교동력계산，결과표명：일조작용하열차통과교량시，교량적가속도몰유명현차이，단횡향화수향위이균유소증가，동시교상행차안전성화서괄성균유소강저。
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.