中文摘要：

为研究地表粗糙度对山区峡谷地形桥址区风环境的影响,通过计算流体力学数值模拟的方法,对不同粗糙度下理想峡谷与真实峡谷模型中主梁跨中位置的风剖面进行了研究。通过理想模型的计算分析,确定了不同风向角下主梁跨中风剖面随粗糙度变化的一般规律,结合对峡谷内流场特点的分析,揭示了粗糙度对峡谷内风速造成影响的原因,并在真实地形模型中进行了验证,根据地表种类细化了粗糙度设置方案。研究表明,在峡谷地形条件下,粗糙度对风速的影响与常规地形有明显差异,在主梁高度处,随着粗糙度的增加,主梁跨中风速可能会有不同程度的增加。研究结论为山区峡谷地形处桥梁设计风速确定提供了依据。

英文摘要：

To study the influence of ground surface roughness on wind environment over bridge site, numerical simulation of the wind speed profiles at the mid-span position in both ideal and real gorge model are carried out by employing Computational Fluid Dynamics Method. According to the analysis of the ideal model, the general law of wind profiles under different roughness is obtained and the characteristics of wind environment in gorge are analyzed. Based on the analysis of the wind field, the causes of roughness＇ influences on wind profiles are revealed. The conclusions are verified in the real gorge terrain model and the roughness distribution is optimized according to the land type. It is showed that in gorge area, the influences of roughness on the wind profiles are essentially different from that in regular area. With the increase of roughness, the wind speed may increase at the height of bridge deck. The research conclusions provide a basis for the determination of design wind speed of the bridge in complex terrain.