低速磁浮轨道梁的温度效应分析

建立低速磁浮轨道梁有限元模型,通过稳态热传导分析,获得上下表面温差和左右侧面温差荷载作用下轨道梁的温度场,运用热-结构耦合分析方法,计算了不同温差荷载作用下磁浮轨道梁的温度变形。计算结果表明,磁浮轨道梁的温度沿温差荷载作用方向近似线性分布,温度梯度随温差值增加而增大;在本文计算条件下,环境温度对轨道梁的温度变形影响较小,当温差荷载大于20℃时,温度引起的磁浮轨道梁竖向或横向挠度超过高速磁浮交通相关规定限值,故实际工程应用中有必要对低速磁浮轨道梁的温度效应进行校核分析。

Temperature Effect of Guideway Girder for Low-speed Maglev Transit

A finite element model of the guideway girder for low-speed maglev transit was built. Then,by steady-state heat conduction analysis,the temperature fields of the guideway girder were obtained under the actions of temperature differences between the upper and lower surfaces as well as between the left and right side surfaces. Further,the temperature deformations of the guideway girder caused by various temperature differences were calculated by thermal-structural coupling analysis method. Calculated results show that the temperature of the guideway girder distributes linearly along the direction of temperature loads,and the temperature gradient increases with the increasing of temperature difference. Moreover,under those calculation conditions in this paper,the environment temperature has little effect on the temperature deformation of the guideway girder. However,when the temperature difference is greater than 20℃,the temperature load will cause the vertical or horizontal deflection of the guideway girder of low-speed maglev transit,and these deflections will exceed the relevant limit value in the recommended standard of high-speed maglev transit. Therefore,it is necessary to check and analyze the temperature effect of the guideway girder of low-speed maglev transit in the practical engineering.