扣件失效对城市轨道交通列车-浮置板式轨道系统竖向振动响应的影响

Influence of fastener failure on responses of vertical vibration of urban rail transit train-floating slab track system

利用基于横向有限条与无砟轨道板段单元的车轨系统竖向振动分析方法,研究1对和多对扣件失效时城市轨道交通列车-浮置板式轨道系统的竖向振动响应。研究结果表明,当列车通过扣件失效的轨道时,轮轨相互作用增大,其中钢轨竖向位移及加速度增长最明显,且随着失效扣件数目增加,动力响应增长越明显;即使毗邻轨道的扣件工作状态良好,也受到失效扣件的影响,钢轨竖向位移及加速度增长显著;扣件失效会加速轨道结构破坏,甚至危及行车安全。

By use of the analysis method of vertical vibration of train and ballastless track system with the lateral finite strip and slab segment element, the dynamic responses of vertical vibration of urban rail transit train - floating slab track system with one or several failed fasteners were investigated. The results show that when a train passes the failed fasteners the interaction between wheel and rail increases, the vertical displacement and vertical acceleration of rails increase obviously, and the more fasteners fail the increase is more obvious; the vertical displacement and vertical acceleration of the rails which are adjacent to the failed fastener will also remarkably increase, and speeds up the track deterioration and even does harm to driving safety.