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文章基于瞬态热传导理论,建立了高精度变形要求轨道梁的温度场数值模型,通过计算数值与实测数值的对比,验证了理论模型的正确性。在此基础上,得到了轨道梁的温度梯度模式。采用空间有限元模型,对轨道梁的温度变形和温度应力进行了计算,并与国家现行公路、铁路规范温度荷载下轨道梁的效应进行了比较。文章研究结果表明,温度梯度模式在靠近顶板部位的温差呈明显的非线性分布。腹板中部温差变化不大,接近底板处有较小温差。轨道梁的温度荷载取值,需在实测资料的基础上,通过瞬态温度场分析合理确定。本文提出的温度梯度模式对同类轨道梁的设计具有实际参考价值。
Based on the theory of transient heat conduction, a numerical model of temperature field for rail beam with high precision deformation is established. The correctness of the theoretical model is verified by comparing the calculated value with the measured value. On this basis, the temperature gradient mode of the rail beam is obtained. The spatial finite element model is used to calculate the temperature deformation and temperature stress of the track beam. The effect of the track beam under the temperature load of the current national highway and railway is compared. The results of the study show that the temperature gradient near the roof is obviously non-linearly distributed. Temperature changes in the middle of the web is not large, near the bottom of a smaller temperature difference. The temperature load of the track beam should be determined on the basis of the measured data by transient temperature field analysis. The proposed temperature gradient model has practical reference value for the design of similar orbital beams.