High-speed railway bridges are inevitably damaged under external loads during operation, which may lead to abnormal vibration of trains, and even threaten running safety. Aiming at the practical problem of high-speed railway longitudinal ballastless track structure damage, based on the train-track-bridge interaction theory, a three-dimensional coupled vibration model of a train-track-bridge was developed using the finite element method. The dynamic response calculation program (TTBCS) was developed using the Newmark-β numerical calculation method. The model and program were used to calculate and analyze the influence of damage to the main components of high-speed railway ballastless track-bridge structure on the dynamic response of the system, including fastener failure, interlayer component damage, and bearing vertical stiffness degradation. The results show that the fastener failure significantly influences the vertical interaction of the wheel-track. The number of fastener failures should not exceed one pair otherwise there is a risk of derailment. When the CA (cement and emulsified asphalt) mortar layer and the slide layer void length exceeds the critical value, the dynamic irregularity of the track-bridge system significantly increases the vertical vibration of the wheel-track system. The critical value of void should be given more attention to in the operation of high-speed railways. The vertical dynamic performance of the train is not sensitive to the change in vertical support stiffness within a certain range of stiffness values but within a certain operation speed range, adjusting the bearing stiffness can play a certain vibration isolation effect.

高速铁路桥梁在运行过程中不可避免地会在外载荷作用下发生损坏，可能导致列车异常振动，甚至威胁运行安全。针对高速铁路纵向无砟轨道结构损伤的实际问题，基于列车-轨道-桥梁相互作用理论，采用有限元法建立了列车-轨道-桥梁三维耦合振动模型。动力响应计算程序（TTBCS）采用Newmark-β数值计算方法开发。利用该模型和程序计算分析高速铁路无砟轨道桥结构主要构件损伤对系统动力响应的影响，包括扣件失效、层间构件损伤、支座竖向刚度退化等。结果表明，紧固件失效显着影响轮轨的垂直相互作用。紧固件失效的数量不应超过一对，否则有脱轨的风险。当CA（水泥和乳化沥青）砂浆层和滑动层空隙长度超过临界值时，轨道-桥梁系统的动态不规则性显着增加了轮-轨道系统的垂直振动。高铁运营中应更加关注空洞的临界值。列车竖向动力性能在一定刚度值范围内对竖向支撑刚度的变化不敏感，但在一定的运行速度范围内，调整轴承刚度可以起到一定的隔振作用。