荷载变形关系求解无缝线路轨道稳定性

STABILITY ANALYSIS FOR CONTINUOUS WELDED RAIL TRACKS USING THEIR RELATION OF LOAD AND DEFORMATION

无缝线路是一种新型轨道结构,是轨道结构现代化的标志。无缝线路稳定性分析是无缝线路的理论基础和关键技术。国内外都非常重视无缝线路的稳定性问题,并进行了大量的试验和理论研究。运用“荷载-变形”关系进行了无缝线路轨道稳定性分析,并推导出钢轨温度力计算公式。输入不同的轨道变形波长,通过优化理论找出最小的钢轨温度力。将此模型的计算结果与不等波长无缝线路轨道稳定性计算方法所得结果进行了对比,两者较为接近,误差不超过2.07%。从而证明此方法的正确性。

The continuous welded rail （CWR） track is a new type of structures applied to railway engineering in modem track transportation. The stability analysis of CWR track plays an important role in theory and practice, and it is the key technique for CWR track transportation. In order to develop the track transportation, many researchers from different countries are engaging in the stability analysis of CWR track in the world, and some experiments and theoretical work have already performed for obtaining the important technique. In the paper, based on the load-deformation relation, the stability of CWR track is investigated and the expression of temperature stress in CWR track is derived for analyzing the mechanical performance of the CWR track. Inputting different deformation wavelengths, the minimum temperature loading of CWR track is obtained by applying the optimization method. The numerical examples are presented through the proposed mechanical model, and their results are compared with those obtained through the method of the rail initial deformation wavelength unequal to the rail elastic distortion wavelength, with the maximum difference being less than 2.07%. The good agreement between them shows that the proposed analytical technique is an effective method for evaluating stresses in CWR track.