斜拉桥风致振动在Ansys中的实现

使用Ansys建立了某大跨度斜拉桥有限元模型,并对该斜拉桥进行动力特征分析,得到了该桥固有频率和振型;利用谐波合成法编制Matlab程序,合成了该斜拉桥的三维空间脉动风场,得到了该桥主梁和桥塔各离散点的脉动风速时程;利用各离散点的风速时程转化为有限元模型中各节点抖振力时程,并对该桥进行了抖振时域分析,得到了该桥在风荷载作用下的动力响应结果。

Realization of Wind-induced Vibration of Cable-stayed Bridge in Ansys

The finite element model of a long-span cable-stayed bridge is established by Ansys,and the natural frequency and mode shape of the bridge are obtained by the dynamic feature analysis of the cable-stayed bridge.The harmonic synthesis method is used to program Matlab in order to synthesize the three-dimensional spatial fluctuating wind field of the cable-stayed bridge and obtain the fluctuating wind speed time history at each discrete point of the main girder and pylon of the bridge.The wind speed time history at each discrete point is converted into the time history of buffeting force at each node in the finite element model.The buffeting time domain analysis of the bridge is carried out,and the dynamic response result of the bridge under the wind load is obtained.