Wind Pressure of Low-rise Buildings Based on Wind-tunnel Numerical-simulation Test

IF 1 Q4 ENGINEERING, CIVIL

Jordan Journal of Civil Engineering Pub Date : 2024-04-12 DOI:10.14525/jjce.v18i2.10

Ding Huiqi

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Abstract

Based on the numerical-simulation test data from the wind tunnel, the wind-pressure characteristics of low-rise buildings with gable roofs are examined and compared to standard values under different roof slopes, eave heights and terrains. To further investigate the underlying mechanisms of variation, a numerical-simulation study was conducted for selected conditions. The results indicate that when the roof slope is less than 3:12, the negative value of the shape coefficient for the windward roof of the building can reach up to -0.89, far exceeding the code value of -0.5. It is suggested that when the slope is not larger than 3:12, the shape coefficient for the windward roof should be -0.9 and the coefficient for the leeward roof should be determined through linear interpolation within the range from -0.4 to -0.75 based on the roof's slope size. With the increase of eave height and the decrease of ground roughness, the vortex intensity of the roof and the leeward surface increases and the area proportion of high negative pressure area in the vortex influence range increases. Thus, the negative value of the shape coefficient for the roof and the leeward surface becomes larger, which is higher than the code value. It is proposed that under an eave height of 12 m, the shape coefficient for the windward roof should be -0.95. Meanwhile, those of the leeward roof, leeward surface and sidewall 2 should be -0.6 under open terrain. Keywords: Low-rise buildings, Wind-tunnel test, Wind load, Shape coefficient, Numerical simulation

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基于风洞数值模拟试验的低层建筑风压测试

根据风洞的数值模拟测试数据，研究了在不同屋顶坡度、檐口高度和地形条件下，坡屋顶低层建筑的风压特性，并与标准值进行了比较。为了进一步研究变化的内在机制，还对选定的条件进行了数值模拟研究。结果表明，当屋顶坡度小于 3:12 时，建筑物迎风屋顶的形状系数负值可高达 -0.89，远远超过规范值 -0.5。建议当坡度不大于 3:12 时，迎风屋面的形状系数应为-0.9，而背风屋面的系数应根据屋面坡度大小在-0.4 至-0.75 范围内通过线性内插法确定。随着屋檐高度的增加和地面粗糙度的减小，屋面和背风面的涡流强度增大，涡流影响范围内高负压区的面积比例增大。因此，屋顶和背风面的形状系数负值变大，高于规范值。建议在檐口高度为 12 米时，迎风面的形状系数应为-0.95。同时，在开阔地形下，背风屋顶、背风面和侧墙 2 的形状系数应为-0.6。关键词低层建筑风洞试验风荷载形状系数数值模拟

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来源期刊

Jordan Journal of Civil Engineering ENGINEERING, CIVIL-

CiteScore

2.10

自引率

27.30%

发文量

期刊介绍： I am very pleased and honored to be appointed as an Editor-in-Chief of the Jordan Journal of Civil Engineering which enjoys an excellent reputation, both locally and internationally. Since development is the essence of life, I hope to continue developing this distinguished Journal, building on the effort of all the Editors-in-Chief and Editorial Board Members as well as Advisory Boards of the Journal since its establishment about a decade ago. I will do my best to focus on publishing high quality diverse articles and move forward in the indexing issue of the Journal.