宜昌长江铁路桥双悬臂施工中风荷载响应研究

文章通过对宜昌长江铁路大桥双悬臂施工中的风荷载计算,提出采用数值模拟计算的方法确定空气静力系数,无需试验设备,流场可视性好,为大跨度预应力混凝土连续刚架桥抗风计算提供了一种简便、经济的方法,最后根据数值模拟得到空气静力系数,并考虑阵风效应,计算得到了宜昌桥大悬臂施工阶段控制截面的风载内力。

Study on wind loads response of the Yichang Yangtze River railway bridge during double cantilever erection stages

In this paper,the application of the numerical simulation method to establish the static wind loadcoefficients is presented by calculating the wind loads of the Yichang Yangtze River railway bridge.Aconvenient and economical method is provided for the calculation of wind-resistance of large span PC continuous rigid frame bridge,which has a series of critical advantages including no use for experimental equipments and fine flow field visualization.The wind-loaded internal force at controlling sections during the cantilever erection stages is successfully obtained,deriving from the static wind load coefficients gained by numerical simulation,as well as considering the gust effect.