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太阳辐射作用下高速磁浮板式轨道梁的温度分布不均匀，容易引起变形、开裂，须在轨道设计中考虑温度的影响。本文基于热传学理论，建立了高速磁浮新型板式轨道-桥梁耦合模型并进行了验证；对其进行一天内瞬态热分析，得到了日照辐射荷载作用下板式轨道-桥梁的温度场分布特性；进而探究了瞬态热作用下结构的垂向、横向变形规律。结果表明：板式轨道-桥梁结构表面温度最大值为53.7℃。日照升温温差作用下，轨道-桥梁的竖向、纵向变形明显，最大值分别为3.59、2.87 mm，最大横向变形仅1.26 mm；板式轨道悬浮面上拱变形明显，最大达3.5 mm，而横向变形相对较小。竖向日照反温差作用下，轨道和桥梁竖向下挠变形明显，跨中截面下挠变形最大，为2.6 mm，横向变形相对较小；轨道悬浮面竖向变形较为明显，最大为1.96 mm。温度梯度引起的变形均未超过规范限值。
Abstract：The temperature distribution of high speed maglev slab track beams under solar radiation is uneven, which can easily cause deformation and cracking. The influence of temperature must be considered in track design. Based on the theory of thermal transfer, and a new type of high speed maglev slab track-bridge coupling model was first established and verified. A one-day transient thermal analysis was conducted to obtain the temperature field distribution characteristics of the slab track-bridge under the influence of solar radiation load. The vertical and lateral deformations of the structure under transient thermal effects were investigated based on its temperature field distribution. The results show that the maximum surface temperature of the slab track-bridge structure is 53.7 ℃. Under the effect of temperature difference caused by sunlight, the vertical and longitudinal deformations of the track-bridge are significant, with maximum vertical and longitudinal deformations of 3.59 and 2.87 mm, respectively, and the maximum lateral deformation of only 1.26 mm. The arch deformation on the suspended surface of the slab track is significant, reaching up to 3.5 mm, while the lateral deformation is relatively small. Under the effect of vertical sunlight and temperature difference, the vertical deflection deformation of the track and bridge is significant, with the maximum deflection deformation at the mid span section of 2.6 mm, and the lateral deformation is relatively small. The vertical deformation of the track suspended surface is relatively obvious, with a maximum of 1.96 mm. The deformation caused by temperature gradient does not exceed the specified limit.
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基本信息:
DOI：
中图分类号:U237;U213.21
引用信息:
[1]魏凌云,彭也也,赵春发,等.日照作用下高速磁浮交通桥上板式轨道结构温度场分布及变形特性[J].铁道建筑,2025,65(12):1-7.
基金信息:
国家自然科学基金（52172375）; 中铁第四勘察设计院集团有限公司科技开发计划（2022K015）