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大跨度桥梁位于强横风环境时,桥塔的遮挡作用会使列车进出桥塔区域时车体受到的风力发生变化,这种风荷载的突变效应会对车辆的动力响应造成影响,此外车辆动力响应的改变还会影响桥梁的动力响应.本文以瓯江大跨公铁两用悬索桥为工程背景,以快速谱分析模拟风场,对桥梁子系统施加抖振风力,对桥梁子系统施加稳态风力,考虑桥塔宽度与车辆长度的关系,建立风-车-桥耦合系统运动平衡方程,以全过程迭代法求解该方程,分析计算了不同车速与风速下桥塔遮风效应对车辆桥梁动力响应的影响.结果表明风速和桥塔宽度越大,车辆的动力响应越大,而桥梁动力响应受桥塔遮风效应影响很小.
The long-span bridge is located in the typhoon environment, the block tower will block the role of the train entering and leaving the tower area when the wind changes, the sudden change of the wind load will affect the vehicle’s dynamic response, in addition to the vehicle dynamic response Will also affect the dynamic response of the bridge.In this paper, the Oujiang River-span long-span railway suspension bridge as the engineering background to rapid spectral analysis of wind field simulation, the application of chattering vibration of the bridge subsystem wind, the bridge subsystem to impose steady wind Considering the relationship between bridge tower width and vehicle length, the equations of motion equilibrium of wind-vehicle-bridge coupling system are established. The whole process iterative method is used to solve this equation. The influence of wind shielding effect of bridge tower under different speeds and wind speeds on the dynamic response of vehicle bridge is analyzed. The results show that the larger the wind speed and bridge width, the larger the dynamic response of the vehicle, while the bridge dynamic response is less affected by the wind-shielding effect of the bridge.