城市轨道交通混凝土连续刚构桥车-桥耦合振动分析

Vehicle-bridge coupling vibration analysis of urban rail transit concrete continuous rigid frame bridge

为研究城市轨道交通混凝土连续刚构桥车-桥系统动力性能,从数值模拟与现场实测两方面分析车−桥系统的振动特性。以满载地铁B型车和某三跨(42 m+65 m+42 m)刚构桥为对象,展开跑车试验,控制列车分别以60,80,100和120 km/h的速度通过待测试桥梁,获得列车−桥梁系统振动响应。然后,采用SIMPACK和ANSYS联合仿真分析方法,计算了不同速度条件下,车-桥系统的动力响应。研究结果表明:列车与桥梁振动指标小于规范限值,列车运行的安全性与乘坐舒适度较好,桥梁结构具有良好的横向、竖向刚度以及动力性能。研究成果可为此类连续刚构桥的动力分析提供指导和借鉴。

To study the characteristic of coupled vibration of train-bridge vibration and the dynamic performance of a concrete continuous rigid frame bridge,the numerical simulation and field measurement were carried out to obtain the vibration characteristic of the train-bridge system.The dynamic responses of the elevated bridge and train were obtained with the train traveling at the velocities of 60,80,100 and 120 km/h by running tests.The cosimulation method of ANSYS and SIMPACK were carried out,in order to discuss the influence of running speed on the train-bridge system.The results shown that,the running safety and riding comfort of the train were good.The lateral stiffness,vertical stiffness and the dynamic performance of the bridge structure were good.This results can provide guidance and reference for dynamic analysis of this kind bridge structure.