地表粗糙度对山区峡谷地形桥址区风场影响研究
发布时间：2018-10-04 23:02
【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。
[Abstract]:In order to study the influence of surface roughness on the wind environment in the mountain canyon topographic bridge site, the wind profile of the midspan position of the main girder in the ideal canyon and the real canyon model under different roughness was studied by means of numerical simulation of computational fluid dynamics (CFD). Through the calculation and analysis of the ideal model, the general law of the variation of the stroke section of the main girder span with the roughness under different wind direction angles is determined. Combined with the analysis of the characteristics of the flow field in the canyon, the cause of the influence of the roughness on the wind speed in the canyon is revealed. It is verified in the real terrain model, and the roughness setting scheme is refined according to the surface type. The results show that under the condition of canyon topography, the influence of roughness on wind speed is obviously different from that of conventional terrain. At the height of the main girder, the wind speed in the middle of the main girder may increase to some extent with the increase of the roughness. The results provide a basis for determining the design wind speed of bridges in mountain canyons.
【作者单位】： 西南交通大学桥梁工程系;
【基金】：国家自然科学基金项目(U1334201) 交通运输部建设科技计划项目(2014318800240) 四川省创新团队项目(2015TD0004)
【分类号】：U442.59
，
本文编号：2252222
[Abstract]:In order to study the influence of surface roughness on the wind environment in the mountain canyon topographic bridge site, the wind profile of the midspan position of the main girder in the ideal canyon and the real canyon model under different roughness was studied by means of numerical simulation of computational fluid dynamics (CFD). Through the calculation and analysis of the ideal model, the general law of the variation of the stroke section of the main girder span with the roughness under different wind direction angles is determined. Combined with the analysis of the characteristics of the flow field in the canyon, the cause of the influence of the roughness on the wind speed in the canyon is revealed. It is verified in the real terrain model, and the roughness setting scheme is refined according to the surface type. The results show that under the condition of canyon topography, the influence of roughness on wind speed is obviously different from that of conventional terrain. At the height of the main girder, the wind speed in the middle of the main girder may increase to some extent with the increase of the roughness. The results provide a basis for determining the design wind speed of bridges in mountain canyons.
【作者单位】： 西南交通大学桥梁工程系;
【基金】：国家自然科学基金项目(U1334201) 交通运输部建设科技计划项目(2014318800240) 四川省创新团队项目(2015TD0004)
【分类号】：U442.59
，
本文编号：2252222
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