汽车撞击作用下车桥系统的动力响应及高速列车运行安全分析

建立了撞击荷载作用下的高速列车-桥梁系统动力分析模型，将汽车撞击力时程作为系统的撞击荷载，以一座5m×24m连续箱梁桥和ICE3高速列车为例，模拟汽车撞击力作用于桥墩和列车过桥的全过程，分析了车桥梁系统的动力响应，对桥上高速列车的运行安全指标进行了评价。结果表明：汽车撞击使桥梁的动力响应大幅度增加，并对高速列车运行安全有极大的影响。对撞击作用下的桥上高速列车走行安全控制方法进行了探讨，给出了列车速度-撞击力强度安全阈值曲线。

DYNAMIC RESPONSES OF TRAIN-BRIDGE SYSTEM SUBJECTED TO TRUCK COLLISION AND RUNNING SAFETY EVALUATION OF HIGH-SPEED TRAIN

A dynamic analysis model is established for a coupled high-speed train and bridge system subjected to a collision-load. A 5m?4m continuous bridge with PC box girders and an ICE3 high-speed train are considered as an illustrating case study. The whole histories of the train running on the bridge while the truck collision load acting on the pier are simulated, based on which the dynamic responses of the bridge and the train are analyzed, and the running safety indices of the train on the bridge are evaluated. The results show that the dynamic responses of the bridge subjected to a truck collision load is greatly increased, resulting in a big influence on the running safety of high-speed trains. A control method for running safety of high-speed trains on the bridge subjected to a collision load is investigated, and the safety threshold curve of train-speed and collision intensity is proposed.