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建立了移动列车荷载作用下点支承连续弹性梁的轨道结构垂向振动动力学分析模型.针对提速线路,采用动力有限元分析方法,分别讨论并比较了有无钢轨初始不平顺条件下,机车以不同行驶速度通过有刚度突变轨道地段时,轨道结构的动力响应规律.理论分析计算表明,线路初始不平顺和由轨枕失效、暗坑等造成的基础刚度的突变对整个轨道结构的动力响应有着显著影响.
The vertical vibration dynamic analysis model of the track structure under point-supported continuous elastic beam under moving train load is established.For the speed-increasing line, dynamic finite element analysis method is used to discuss and compare whether the rail with or without initial rail irregularity, The dynamic response of orbital structures with different driving velocities passing through the orbit with sudden changes in stiffness is analyzed theoretically.The results show that the sudden changes of the initial stiffness of the line and the foundation stiffness due to sleeper failure and dark pit have significant effects on the dynamic response of the whole orbit structure influences.