某斜拉桥风致抖振作用及减振控制设计

Wind-induced buffeting and vibration reduction control design of cable-stayed bridge

为了减小某特大跨度斜拉桥最大悬臂施工状态及成桥状态的风致抖振作用,对该桥进行了风振减振控制设计。通过数值计算及风洞试验,得到了该桥最大悬臂施工状态及成桥状态减振前后的风振响应,并对两种状态进行了风振减振控制设计,最后对桥梁的舒适度指标进行了判定。结果表明:桥梁在最大悬臂施工及成桥状态下,主梁的抖振响应较大;采用MTMD对桥梁进行了风振减振控制设计,MTMD减振效果明显;减振控制设计后,桥梁可基本满足施工及桥梁安全要求。

In order to reduce the maximum cantilever construction state and completed bridge state buffeting effect of the cable-stayed bridge,the vibration reduction control design of the bridge is carried out.Through the numerical calculation and wind tunnel test,the wind-induced response of the bridge is obtained,under the maximum cantilever construction state and completed bridge state.The vibration reduction control design of the two states is conducted.And the bridge comfort index is determined.The results show that the buffeting response of the main girder is larger under the maximum cantilever construction and the completed bridge state.MTMD is used to design the vibration reduction control of the bridge,and the MTMD reducing effect is obvious.After the vibration reduction control design,the bridge can meet the construction and bridge safety requirements.