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高速铁路高架桥梁很多,跨越公路的桥墩被汽车撞击所引起的振动会影响列车运行安全。利用车-轨-桥耦合动力试验平台,通过模型试验研究了横向撞击力对桥梁及桥上车辆运行安全的影响规律。试验过程中采集了撞击处撞击力时程、桥墩底部动应变、墩顶动位移、墩顶加速度时程,梁1/4,1/2,3/4处的横向动位移和加速度时程,以及车辆的三向车体加速度时程,计算得到桥墩自振频率等振动特性。分析了车桥系统有无撞击力作用时的动力响应,以及撞击力对桥梁及桥上运行车辆的影响规律。结果表明,横向撞击使桥梁的动力响应大幅度增加,并对车辆运行安全有很大的影响。最后根据撞击力时程探讨了瞬态撞击力的等效静力计算方法并验证,为工程设计提供参考。
Many high-speed railway viaduct, bridge pier across the road caused by car crash vibration will affect the safety of train operation. Using the vehicle-rail-bridge coupled dynamic test platform, the influence of transverse impact on the running safety of bridges and bridges is studied through model tests. During the test, the impact duration, the dynamic strain at the bottom of pier, the top displacement of pier, the time history of pier top acceleration, the transverse dynamic displacement and acceleration time history at 1/4, 1 / 2,3 / 4 of the beam were collected. As well as the vehicle’s three-way body acceleration time history, calculate the natural frequency of the bridge pier and other vibration characteristics. The dynamic response of the axle system with or without impact force and the influence of impact force on the bridge and bridge running vehicle are analyzed. The results show that the lateral impact greatly increases the dynamic response of the bridge and greatly affects the running safety of the vehicle. Finally, according to the impact time history, the equivalent static calculation method of transient impact force is discussed and verified, which provides a reference for engineering design.