城市轨道交通连续刚构桥车桥耦合动力分析

Coupling dynamic analysis of vehicle/bridge of urban mass transit continuous rigid frame bridge

采用23个自由度的多刚体车辆动力分析模型、空间梁单元模拟桥梁结构,据位移协调原理,建立了广州市轨道交通四号线四跨变截面连续刚构特大桥沙湾大桥车桥耦合时变动力分析模型,并将轨道的竖向不平顺和方向不平顺作为系统的激振源,编制程序计算地铁列车通过时的车桥耦合振动响应。计算结果表明:在地铁列车常用编组和运营条件下,车辆与桥梁的振动响应随着列车速度的提高而缓慢增大;列车舒适性与安全性各项指标均能满足要求;桥梁具有足够的竖向刚度与横向刚度,所得结果可供设计参考。

A time varying dynamic analysis method of the train - bridge of urban mass transit No. 4 four - span continuous variable cross- section rigid frame bridge situated in Guangzhou City was established. With the vertical and lateral track irregularity as the exciting source of the coupled vibration system, the program was used to calculate the dynamic response of the Metro train. The results show that when the Metro pass the bridge normally, the response of Metro and bridge both increase slightly with the increase of Metro speed; the Metro can pass it safely and comfortably and the bridge is of enough vertical and transverse stiffness. The results provide a reference for design.