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采用有限元分析方法,建立浮置板轨道结构的三维有限元模型,对不同橡胶支承刚度和扣件刚度组合条件下,两种密度混凝土浮置板进行模态分析,获得了橡胶支承刚度为20 kN.mm-1、扣件刚度为30 kN.mm-1时浮置板轨道结构的低阶固有频率和振型,其结果与试验结果吻合.分析了混凝土板密度、橡胶支承刚度、扣件刚度对浮置板轨道结构系统振动特性的影响,可为浮置板轨道结构的减振降噪优化设计提供理论依据.
The three-dimensional finite element model of the floating slab track structure was established by using the finite element analysis method. The modal analysis of two kinds of density concrete floating slab under different combinations of rubber bearing stiffness and fastener stiffness was obtained. The rubber bearing stiffness was 20 kN.mm-1, the low-order natural frequencies and mode shapes of the track structure of the floating slab when the fastener stiffness is 30 kN.mm-1, the results are in good agreement with the experimental results.The concrete slab density, rubber bearing stiffness, The effect of stiffness on the vibration characteristics of the floating slab track structure system can provide a theoretical basis for the optimal design of the vibration and noise reduction of the slab track structure.