内外力矩平衡法计算无缝线路轨道稳定性

Stability of tracks with continuous welded rails using equilibrium of inner and external moment of force

采用内外力矩平衡法,并考虑轨道原始弯曲和非线性道床横向阻力及扣件阻矩,在轨道变形曲线假设为半波正弦曲线的情况下,对无缝线路轨道稳定性进行分析,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使用《铁路轨道设计规范》条文中的轨道稳定性计算方法所得结果进行对比,发现两者计算结果较为接近。相对误差不超过3.8%,从而证明此方法的正确性。

The track showed some form of geometrical imperfection or misaligmnent, and the track was loaded by a non- linear lateral ballast resistance and fastening moment of force. In view of the treatment of the rail buckling problem, a continuous sinusoidal shape was assumed. Based on equilibrium of inner ＆ external moment of force, the stability of CWR track was researched and the expression of temperature stress in CWR track was derived for analyzing the mechanical performance of the CWR track. Inputting different deformation wavelengths, the minimum temperature load of CWR track was obtained by applying the optimization method. The numerical results using proposed mechanical model were presented, and compared with those using the method in code for design of railway track. There is the maximum difference being less than . The good agreement between them shows that the proposed technique is an effective method for evaluating stresses in CWR track.