中文摘要：

研究目的：为研究高速列车制动对高墩桥梁纵向动力响应的影响，本文利用自主研发软件TrBLS—DYNA建立列车-轨道-桥梁耦合系统纵向动力模型，分别采用有限元方法建立轨道一桥梁三维空间模型，采用刚体动力学方法建立车辆纵向动力模型。依据动车组的制动减速度特性曲线，通过数值积分方法求解车辆和桥梁耦合动力方程，进行耦合系统纵向动力响应分析，并以石夹沟高墩简支梁桥为例进行车一桥纵向耦合振动分析。研究结论：（1）高速列车在高墩桥梁上快速制动时，对高墩桥梁纵向振动影响较小，主梁纵向位移最大值为0．17mm，纵向加速度最大值为58mm／s^2；（2）列车制动过程中，主梁纵向位移具有累积性，最大值一般出现在列车制动停车之前，而纵向振动加速度与之相反，最大值一般出现在列车停车瞬间；（3）按照现行《铁路桥涵设计规范》制动力静力计算方法得到的最大墩底弯矩为3960．7kN·m，本文算法得到的最大值为1152．0kN·m，仅为规范静力算法的31．5％，表明规范对制动力的取值具有较大的安全储备；（4）本研究成果可为高墩铁路桥梁的设计提供参考。

英文摘要：

Research purposes： To investigate the longitudinal vibration performance of railway bridge with high piers induced by the action of braking of high - speed train, a longitudinal dynamic analysis model for a coupled train - track - bridge system is established using the software TFBLS - DYNA developed autonomously. The finite element method is adopted to create track - bridge 3 - D spatial model and the vehicle subsystem is modeled by rigid body dynamics. According to the braking deceleration characteristic curve of the EMU train, a numerical integration method is adopted to solve the dynamic equations of vehicle and bridge respectively, and then the dynamic response of the interaction system is analyzed. Take Shijiagou simply - supported bridge with high piers as numerical example to analyze train - track - bridge longitudinal coupled vibration. Research conclusions：（ 1 ） The longitudinal vibration of the bridge with high piers is generally small, the maximum displacement and acceleration value are 0.17 mm and 58 mm/s2 respectively. （2） The longitudinal deformation of beam has accumulative character during the braking procedure of EMU, the maximum displacement occurs before the moment of train stopping. In contrast, the maximum longitudinal acceleration occurs at the moment of train stopping. （3）The maximum value of the bending moment at the bottom of all piers is 1 152.0 kN · m, which is only 31.5% of the value 3 960.7 kN · m obtained by the static force calculation method according to the code for design on railway bridge and culvert in China. It indicates that the braking force of high - speed train obtained from the code possess a higher safety stock. （4） The research results of this paper can provide good references for design of railway bridges with high piers.