磁悬浮大跨度桥梁车桥耦合系统动力响应

Vehicle-bridge Coupled Dynamic Response of Magnetic Suspension Long-spanned Continuous Girder Bridge

以规划中的株洲段磁浮跨湘江大桥为背景,推导出磁浮列车系统的总势能,根据弹性系统总势能不变值原理和对号入座法则,建立磁浮列车-桥梁耦合系统动力响应方程。基于Fortran语言编制计算程序,对中低速磁浮列车-大跨度桥梁的耦合振动特性进行分析,通过改变磁浮列车-桥梁耦合系统的动力响应参数,包括行车速度、列车载重、车道数及轨道不平顺,分析各参数对车桥耦合系统的影响规律,并综合采用狄克曼指标和Sperling指标对磁浮列车的行车舒适性进行分析判断。结果表明:桥梁振动舒适性良好,动力参数分析所得结论可为磁浮桥梁设计施工、日常运营管理提供参考。

Based on the planned Zhuzhou maglev train across Xiangjiang River bridge,the total maglev train vibration potential energy was derived.Based on the stationary value principle of the total dynamic potential energy in elastic system and sit-in-right-position rule,the motion equations of time-variant maglev train-bridge coupled system were established.The dynamic responses of long-spanned continuous girder bridge under moving maglev trains were analyzed by using program with Fortran,and the dynamic response parameters were analyzed.Finally,the bridge vibration comfort was evaluated with Dickmann index and Sperling index.The results show that the bridge vibration is well,the dynamic response parameters of time-variant vehicle-bridge coupled system are analyzed.The conclusions can provide references for construction and design of magnetic suspension long span continuous girder bridge,both daily operation and management.