无缝线路钢轨局部温变对纵向力学特性影响

为了研究无缝线路钢轨局部温度变化对钢轨纵向力学特性的影响,基于有限元分析软件ANSYS建立了无缝线路钢轨局部温度变化的力学分析模型,研究无缝线路钢轨局部降温后,以及局部降温后再次升温的纵向应力重分布和纵向位移的变化。结果表明:钢轨局部降温能够有效放散温度力,但钢轨降温区段会产生纵向收缩位移;钢轨局部降温再升温过程会导致钢轨爬行,积累钢轨纵向应力,使其不再均匀分布。

Influence of Local Temperature Change on Longitudinal Mechanical Characteristics of Continuously Welded Rail Track

To study the effect of local temperature change on the longitudinal mechanical characteristics of continuously welded rail track, the model for such mechanical analysis was established depending on the finite element analysis software ANSYS, and then the changes of both the longitudinal stress redistribution and the longitudinal displacement after local temperature drop and local temperature rise once more after the temperature drop occurring at the rail track, were studied. The results show that, the local temperature drop of rail track may relieve the temperature stress, but lead to longitudinal shrinkage displacement therein; and the local temperature rise after temperature drop may cause track creeping and longitudinal stress accumulation therein, leading to uneven distribution of rail track.