高速铁路摇摆隔震桥梁的车致振动特性分析

Analysis of Vehicle Induced Vibration Characteristics of High-speed Railway Bridge with Rocking Isolation Pier

摇摆隔震桥墩由于良好的隔振性能近年来受到设计人员的关注,然对其正常运行的动力性能研究较少。基于车-桥耦合动力相互作用理论,建立了制动墩为传统抗震桥墩和摇摆隔震桥墩的车-桥耦合模型,研究了制动墩墩高对两种结构动力响应的影响,结果表明:车体垂向加速度、桥梁横垂向位移及桥梁横垂向加速度等响应参数出现了大幅增加。因此,当制动墩采用摇摆隔震墩时,应对车辆、桥梁动力响应指标进行分析,以保证行车和结构安全。

In recent years,due to the good vibration performance,the rocking isolation piers are used widely.Howerer,the research on its dynamic performance is still less.In this paper,the effect of rocking isolation pier on vehicle-induced vibration was studied.Based on the vehicle-bridge coupling dynamic interaction theory,two different vehicle-bridge coupling models had been established,in which the braking piers were considered as traditional seismic piers and rocking isolation piers,respectively.The influence of the height of the brake pier on the dynamic response of two vehicle-bridge coupling models was studied.The results show that the response parameters such as vehicle body vertical acceleration,bridge lateral vertical displacement and bridge lateral vertical acceleration have increased significantly.Therefore,the vehiclebridge coupling dynamic interaction model should be used to analyze the response indexes of the vehicle and the bridge,so as to ensure the train and structural safety.