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现行规范的设计风荷载以普通大气边界层风场为主,其平均风剖面为指数型或对数型。下击暴流风场的典型风剖面与普通边界层风场差异很大。基于稳态冲击射流试验和数值模拟分析,考虑平地与坡地两种地形以及坡地坡度的影响,研究冲击射流风场中的高层建筑物表面风压分布特性与风荷载情况。风洞试验和数值模拟结果表明:冲击射流风场中建筑表面风压分布不同于大气边界层风场,迎风面最大风压出现在建筑下部;坡地上建筑物迎风面风压小于同等情况下平地上建筑物迎风面风压,而在侧面和背风面则呈现出相反的规律。对不同坡度坡地上的模型分析结果表明,随着坡地坡度的增大,建筑迎风面风压逐渐减小。
The current normative design wind load is dominated by the common atmospheric boundary layer wind field and the average wind profile is either exponential or logarithmic. The typical wind profile of the downburst wind field differs greatly from the wind field of the normal boundary layer. Based on the steady-state impinging jet test and numerical simulation analysis, considering the influence of two kinds of landform and slope landform and slope gradient, the wind pressure distribution and wind load on the surface of high-rise buildings in impinging jet wind field are studied. Wind tunnel tests and numerical simulation results show that the wind pressure distribution on the building surface in impinging jet wind field is different from the wind field in the atmospheric boundary layer and the maximum wind pressure on the windward side appears in the lower part of the building. Wind pressure on the windward side of the slope is less than that on the same level Windward pressure on the building, and in the side and the leeward side presents the opposite law. The results of model analysis on different slope slopes show that the wind pressure on the windward side of the slope gradually decreases with the slope gradient increasing.