考虑附加变形的公路-磁浮合建桥车桥耦合动力响应研究

为了解温度变化和汽车荷载布置引起的附加变形对大跨度公路-磁浮合建桥及磁浮列车动力性能的影响,以某三塔四跨公轨合建大跨度斜拉桥为背景,采用UM及ANSYS软件建立磁浮列车、桥梁、悬浮控制器模型,分析温度、汽车荷载作用下的附加变形对车桥动力响应的影响。结果表明:温度附加变形对桥梁及磁浮列车的动力响应影响较小;汽车偏载作用对桥梁和磁浮车辆的横向动力响应影响较明显,6车道对称布载作用对磁浮列车的加速度和Sperling指标的影响不大,但悬浮间隙波动范围增大了30%;汽车荷载对公轨合建桥梁车桥动力响应的影响较大,需予以重点考虑。

Study of Vehicle-Bridge Coupling Dynamic Response of a Combined Highway and Maglev Bridge Considering Additional Deformation

For the long-span combined highway and maglev bridge,temperature variation and vehicle loads distribution can cause additional deformation of the structure,and which will influence the dynamic responses of the bridge structure and maglev trains.To address this issue,a long-span combined highway and maglev cable-stayed bridge that has three pylons and four spans is taken as a case.The software UM and ANSYS were employed to establish the models of the maglev trains,bridge and levitation controller,to analyze the influence of additional deformation caused by thermal and vehicle loads on the vehicle-bridge system.The results show that the additional deformation induced by thermal loads has minimal influence on the dynamic responses of the bridge and maglev trains,while the vehicle eccentric loads can exert significant effect on the transverse dynamic responses of the bridge and the maglev trains.Six-lane symmetrical loads did not lead to significant change of acceleration of the maglev train and the Sperling index,but the fluctuation range of the suspension gaps was increased by 30%.Vehicle loads can exert significant influence on the dynamic responses of the bridge and the trains,which should be taken as a key control factor.