稳态冲击射流作用下平地及坡地高层建筑的风荷载特性

发布时间：2018-06-15 23:52

本文选题：高层建筑 + 冲击射流　；参考：《建筑结构学报》2017年03期

【摘要】：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。
[Abstract]:The design wind load of the current code is dominated by the general atmospheric boundary layer wind field, and the average wind profile is exponential or logarithmic. The typical wind profile of the downburst wind field is very different from that of the common boundary layer. Based on steady state impinging jet test and numerical simulation, the wind pressure distribution and wind load on the surface of high-rise buildings in impinging jet wind field are studied considering the effects of flat and slope topography and slope gradient. The results of wind tunnel test and numerical simulation show that the wind pressure distribution on the building surface is different from that in the atmospheric boundary layer in the impinging jet wind field, and the maximum upwind wind pressure appears in the lower part of the building. The upwind pressure of building on the slope is less than that on the windward surface of the flat ground building under the same condition, but the opposite rule is found on the side and the leeward surface. The results of model analysis on different slopes show that with the increase of slope, the upwind wind pressure decreases gradually.
【作者单位】：重庆大学山地城镇建设与新技术教育部重点实验室;重庆大学土木工程学院;
【基金】：国家自然科学基金项目(51208537) 中央高校基本科研业务费专项(CDJZR12200016)
【分类号】：TU973.213

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