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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-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。
Research purposes: The finite element method is used to solve the problem of buckling instability of CWR, especially for small radius curve under temperature force. Research methods: The railframe model including rail, fastener, sleeper and track bed resistance is established, and the corresponding numerical calculation formulas are derived and the finite element program is developed. The model also considers the influence of transverse forces on the stability of the CWR. The results show that the rail lateral displacement-temperature curve under different conditions is obtained and compared with the “unified formula”. Research conclusions: Finite element method is feasible and effective in studying the stability of CWR. Finite element method can calculate the lateral displacement of the orbital structure from the locked rail temperature to the whole process of destruction under different conditions, Formula ", this method can consider all kinds of complex working conditions, can more accurately reflect the trend of rail lateral deformation, and thus provide theoretical guidance for maintenance and repair of railway construction department.