Continuously welded rails (CWR) are sensitive to thermal and train loads which could destabilize the track and cause buckling. The study of track buckling in the literature, however, is mostly focused on static analysis of CWR tracks under thermal loads. Yet in reality, train dynamic loads in lateral, vertical and longitudinal directions can have a major impact on track buckling behaviour. Moreover, track and wheel defects can aggravate the dynamic train track interaction loads, and reduce the safety against track buckling. The aim of this paper is to have an in-depth comparison of static and dynamic track buckling by employing a multi-body train-track dynamic model and a 3D finite element track model. Various scenarios are elaborated, base scenario dealing with static thermal analysis, dynamic analysis for a steady motion of a wagon with constant speed, dynamic analysis for a wagon with defect free wheels during braking, and dynamic analysis for a wagon with out of round defect wheels during braking. For each scenario, a sensitivity analysis of relevant parameters is also presented. Based on the results, it is concluded that train loads can significantly change the buckling temperature, as well as the safe temperature. For a severe braking of a wagon with out of round wheel defect of order 3, buckling temperature is almost 5.5 °C less than that of the static case. The drop for safe temperature in this case is 6.7 °C.

连续焊接的钢轨（CWR）对热负荷和火车负荷敏感，这可能会使轨道不稳定并导致屈曲。然而，文献中对轨道屈曲的研究主要集中在热负荷下的CWR轨道的静态分析。然而实际上，列车在横向，垂直和纵向方向上的动态载荷可能会对轨道的屈曲行为产生重大影响。而且，轨道和车轮缺陷会加剧列车动态轨道相互作用的负荷，并降低抗轨道屈曲的安全性。本文的目的是通过采用多体列车-轨道动力学模型和3D有限元轨道模型，对静，动态轨道屈曲进行深入的比较。阐述了各种方案，涉及静态热分析的基本方案，动态分析，以恒定速度进行货车的平稳运动；动态分析，以在制动过程中对带有无缺陷车轮的货车进行动力学分析；动态分析，以在制动过程中对具有非圆形缺陷车轮的货车进行动力学分析。对于每种情况，还介绍了相关参数的敏感性分析。根据结果​​，可以得出结论，火车载荷可以显着改变屈曲温度以及安全温度。对于严重制动且车轮缺损为3级的货车，屈曲温度比静态情况低近5.5°C。在这种情况下，安全温度下降了6.7°C。还介绍了相关参数的敏感性分析。根据结果​​，可以得出结论，火车载荷可以显着改变屈曲温度以及安全温度。对于严重制动且车轮缺损为3级的货车，屈曲温度比静态情况低近5.5°C。在这种情况下，安全温度下降了6.7°C。还介绍了相关参数的敏感性分析。根据结果​​，可以得出结论，火车载荷可以显着改变屈曲温度以及安全温度。对于严重制动且车轮缺损为3级的货车，屈曲温度比静态情况低近5.5°C。在这种情况下，安全温度下降了6.7°C。