山区高墩大跨桥梁静力三分力系数参数影响研究

摘要

以某山区高墩大跨桥梁为工程背景,采用专业CFD软件Fluent对其主梁不同截面、不同风工况下的风场特征进行了数值仿真分析,分析梁高、风攻角、桥梁横坡等参数对桥梁主梁截面静力三分力系数的影响,对各参数的影响规律进行总结.利用 Fluent软件后处理图形显示功能,分析了典型工况下箱梁截面周围的气动流场特征.分析结果表明:梁高、风攻角、截面横坡均为主梁截面三分力系数的影响因素,高墩大跨桥梁主梁为钝体结构,梁高越高,在风场中的钝性特征越明显.%Taking the mountainous high-pier and large-span bridge as the background engineer-ing,the characteristics of the wind field of the girder under different sections and different wind condi-tions were numerically simulated by use of the Fluent software of CFD,the effects of beam height,at-tack angel and section cross slope to the aerostatic coefficients were analyzed and the influencing rules of parameters were concluded.The characteristics of the aerodynamic flow field of the box girder sections a-round under the traditional conditions were analyzed by use of the reprocessing graphic display function of the Fluent software.The results show that all the three parameters above are influencing factors of the aer-ostatic coefficients,the high-pier and large-span bridge is a bluff body structure and a lager beam height can cause more obvious characteristics of the bluff body in the wind field.