紧邻高陡山体桥址区风特性数值模拟研究

摘要

A long-span suspension bridge adjacent a high-steep mountain is regarded as a typical example in this paper. Numerical simulation for the wind field distribution of the bridge site with complex terrain is carried out by em ploying CFD commercial software FLUENT. According to comparative analysis of many different cases, influence of high-steep mountain on the average wind velocities, wind attack angles and wind profiles along the bridge deck under different flow directions are analyzed, effect of gorge wind at bridge site is discussed. It is shown that the change laws of average wind velocities, wind attack angles and wind profiles along the bridge deck nearby the high-steep mountain vary with the flow directions, also the range of influence by the high-steep mountain; furthermore, the bridge site has no notable effect of gorge wind. The research conclusions provide the foundation for the further wind-resistant design.%以紧邻高陡山体的大跨度悬索桥为工程背景,应用CFD商业软件FLUENT对桥址区复杂地形地貌进行了区域地形风场数值模拟研究,通过多工况的对比分析,探讨了不同来流情况下高陡山体对主梁平均风速、风攻角以及风剖面的影响,讨论了桥址区的峡谷风效应.研究结果表明,随来流方向的不同,主梁平均风速、风攻角及风剖面形状在高陡山体附近变化的规律以及受高陡山体影响的范围不同,桥址处未形成明显的峡谷风效应.研究结论为该桥的进一步抗风设计提供依据.