磁浮轨道钢箱梁日照温度场及变形研究  

Research on temperature field and thermal deformation of steel box maglev guideway caused by solar radiation

作　　者：李国强[1] 王琛奥 叶丰[2] 陈素文[1] Li Guoqiang;Wang Chen’ao;Ye Feng;Chen Suwen(Department of Structural Engineering,Tongji University,Shanghai 200092,China;National Maglev Transportation Engineering R&D Center,Tongji University,Shanghai 201804,China)

机构地区：[1]同济大学建筑工程系,上海200092 [2]同济大学国家磁浮交通工程技术研究中心,上海201804

出　　处：《土木工程学报》2019年第11期45-55,共11页China Civil Engineering Journal

基　　金：“十三五”国家重点研发计划先进轨道交通重点专项(2016YFB1200601)

摘　　要：磁浮轨道梁日照作用下的温度变形是轨道梁设计需考虑的重要因素,文章根据传热学与有限元理论,结合上海夏季气象参数与日照辐射半经验公式,利用ANSYS建立上海磁浮线轨道钢箱梁日照温度场三维瞬态模型,经实测构件验证,计算值与实测值吻合良好。分析磁浮轨道梁的最大竖向与横向温差发生时刻的温度梯度分布,并以指数函数为基础拟合得到对应温度梯度曲线,竖向温差拟合值略低于德国磁浮规范值,横向温差拟合值高于德国磁浮规范值。基于日照温度场分析结果,计算不同支承形式钢轨道梁的温度变形,得到磁浮轨道钢箱梁在双跨连续形式下能够较好抵抗温度变形的结论。提出磁浮轨道钢箱梁外露部分涂料的选取建议,以减小日照辐射吸收能量,从而降低截面温差及温度梯度变形。Thermal deformation of maglev track beam caused by solar radiation is an important factor considered in the design. Based on meteorological data and solar radiation semi-empirical formulas of Shanghai in summer, a three-dimensional model for a section of Shanghai maglev line steel box girder with transient state analysis method is established using ANSYS. The temperature field is calculated according to the principle of heat conduction and the finite element method. The calculated temperature field of the experiment model agree well with the measured record. The temperature gradient distribution of the maximum vertical and transverse temperature difference of the steel maglev track beam is analyzed. The corresponding temperature gradient curves are fitted based on the exponential function. The peak fitting value of the vertical temperature difference is slightly lower than that of the German Maglev Code. The peak fitting value of the transverse temperature difference is higher than that of the German Maglev Code. Based on the analysis results of temperature field caused by solar radiation, the temperature deformations of steel track beams with different supporting forms are calculated. It is concluded that steel box maglev track beam two-span continuous structure perform a better temperature deformation. Finally, in order to reduce the absorbed energy of solar radiation, as well as the temperature gradient and deformation, suggestions on the selection of coating for steel box maglev track are put forward.

关 键 词：钢箱梁 磁浮轨道梁 日照辐射 温度梯度 温度变形 

分 类 号：U237[交通运输工程—道路与铁道工程]