橡胶浮置板轨道对城市高架箱梁减振特性数值分析

Numerical Analysis on Vibration Reduction Characteristics of Floating Slab Track in Metro Viaduct Box Girder

为了研究橡胶浮置板轨道对城市高架箱梁结构的减振特性,建立了高架橡胶浮置板轨道结构三维有限元模型,分析了当减振器刚度和轨道板长度变化对高架桥系统动力响应影响。研究结果表明,减振器刚度的改变对浮置板前10阶振动频率分布影响较大,对累积质量分数分布特性几乎没有影响,相同阶数条件下浮置板的振动主频随减振器刚度减小而减小;列车通过时浮置板轨道以增大自身的振动来达到减小对桥梁结构振动能量输入的目的,在减振频率范围内,浮置板的减振效果随减振器刚度增大而减小,随浮置板长度的减小而减小。

Abstract：A 3D FEM model was established to analyze the vibration reduction characteristics of rubber floating slab in metro viaduct and the influence of stiffness of damper and slap length on viaduct vibration characteristics were studied. The results showed that the stiffness of damper and slap length have a large influence on the top 10 order natural frequency distribution of floating slab, and almost no effect on distribution characteristics of cumulative mass fraction, the natural frequency of floating slab track decreases as damper stiffiaess decreases and also the distance increases under the condition of the same order. The floating slabs reduce the vibration energy that transmits to the bridge by increasing its own vibration as trains pass. In the range of vibration reduction frequency, the vibration reduction effect of floating slab decreases with the damper stiffness decreases and increases as the slap length increases.