横向地震激励下的悬索桥车-桥耦合动力响应分析

Coupled dynamic response of train-bridge of suspension bridge with lateral seismic excitation

为探讨横向地震荷载对列车—悬索桥耦合系统动力响应的影响,以几江公铁两用悬索桥为研究对象,将轨道不平顺作为系统的自激激励源,地震作为外部激励,根据弹性系统动力学总势能不变值原理及形成矩阵的"对号入座"法则,建立地震激励下的车桥系统耦合振动方程和分析模型,对在横向地震波激励下列车通过悬索桥进行了全过程的模拟。分析结果表明:横向地震激励对悬索桥上的列车运行安全性和舒适性有着显著影响。

The dynamic response effect of train- suspension bridge coupling during lateral earthquake was stud- ied. Jijiang rail - cure - road suspension bridge was examined. According to the principle of total potential energy with stationary value in elastic system dynamics and the ＂set in right position＂ rule for formulating system matri- xes, taking the track irregularities as the self- excitation source of the system and the seismic as external excita- tion, the coupling vibration equation and the analysis model of coupled train - bridge system under the seismic excitation was established. The whole history of the train running through the suspension bridge was simulated and the dynamic responses of the bridge and the vehicles were calculated under the lateral seismic excitation. The results show that lateral seismic excitation has significant effects on the running safety and comfort of the ve- hicles on the suspension bridge.