小半径曲线无缝线路稳定性有限元分析

研究目的：利用有限元法解决在温度力作用下无缝线路特别是小半径曲线的臌曲失稳问题。 研究方法：建立了包含钢轨、扣件、轨枕和道床阻力为一体的轨道框架模型，推导了相应的数值计算公式并编制了有限元程序。该模型还考虑了横向力对无缝线路稳定性的影响。 研究结果：得到了不同工况下钢轨横向位移一温度曲线，并与“统一公式”进行了比较。 研究结论：有限元方法在研究无缝线路稳定性方面是可行和有效的；有限元方法能计算出不同工况下的轨道结构从锁定轨温直到破坏全过程的横向位移，相对于“统一公式”，该方法可考虑各种复杂的工况，能更精确地反映轨道横向变形的趋势，从而为铁路工务部门养护维修提供理论指导。

Finite Element Method for Analyzing the Stability of Continuous Welded Rail Track on Minor Radius Curve

Research purposes: The paper aimed at resolving the stability of continuous welded rail(CWR) under temperature forces by the finite element method,especially for minor-radius-curve CWR.Research methods:A track-frame model has been developed,which includes rails,pads,sleepers and ballast resistance,and the finite element program has been exploited using numerical formulation.The influence of cross force was also considered in this model.Research results:The dependence of the CWR displacement on temperature figures in different work conditions were arrived,and the result was compared with the result of universal formulation.Research conclusions:Finite element method is effective on analyzing the stability of CWR.And it can analyze the lateral displacement of CWR track from locked-in temperature to damage.Compared with the universal formulation,the method can accurately present the trend of the lateral displacement of track in several work conditions,and provide an evidential material for railway department in planning of maintaining the track.