高速磁浮组合式轨道梁的温度变形

Temperature Deformation of Composite Track Girder of High Speed Maglev

针对高速磁浮组合式轨道梁日照温度效应问题,建立组合式轨道梁热-结构耦合有限元三维空间模型,基于热力学基本原理对其进行24 h瞬态热分析并得到日照环境下的温度场,研究连接构件对组合式轨道梁温度场及温度变形的影响,探讨不同连接构件高度组合式轨道梁温度变形的特性。结果表明:顺桥向各截面温度场随梁截面的变化而变化;截面变化对有连接构件梁的温度场影响较大,对无连接构件梁的温度场影响较小;组合式轨道梁的温度变形高于相同尺寸下整体箱梁的温度变形,连接构件的高度对组合式轨道梁横向和纵向的温度变形影响较小。

Aiming at the problem of sunshine temperature effect of composite track girder of high speed maglev,a threedimensional space model of thermal-structure coupling finite element of composite track girder was established.Based on the basic principle of thermodynamics,the 24 h transient thermal analysis of the box girder was carried out to obtain the temperature field of composite track girder exposed to the atmosphere.The influence of jointing components on the temperature field and the temperature deformation of composite track girder was studied,and the temperature deformation characteristics of composite track girder with different jointing component heights were discussed.The results show that the temperature field along the bridge direction varies with the change of girder section.The change of the section has a greater influence on the temperature field of the girder with jointing components,but has little influence on the temperature field of the girder without jointing components.The temperature deformation of the composite track girder is higher than that of the integral box girder under the same size,the height of jointing components has little effect on the transverse and longitudinal temperature deformations of the composite track girder.