Measured research on wind and rain field of building roof and wind-driven rain on prominent building facade
王辉 1吴安超 1吴学健 1吴亚雄1
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作者信息
1. 合肥工业大学土木与水利工程学院,安徽合肥 230009
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摘要
文章对某多层建筑屋面区域风驱雨(wind-driven rain,WDR)开展实测,结合3类典型降雨事件的分析,揭示大气湍流特征以及风速、风向对雨滴的影响特性,并针对突出屋面建筑,实测分析立面WDR分布特性,量化国际标准化组织(International Organization for Standardization,ISO)半经验模型对突出屋面建筑WDR预测的偏差.结果表明,在3类降雨事件中,湍流度、阵风因子和湍流积分尺度的实测值与基于地面实测建立的公式理论值之间存在较大差异;实测的雨滴数量与标准M-P谱计算的雨滴数量差值最大为125个.在风速和雨强差异较小时,建筑立面WDR分布受来流与立面夹角的影响显著.由于ISO半经验模型是基于地面实测建立的,其对突出屋面建筑WDR的预测存在偏差,在模型适用的降雨条件下实测值约为ISO预测值的2倍.
Abstract
This paper measured wind-driven rain(WDR)in the roof area of a multi-storey building,an-alyzed three typical rainfall events to reveal the characteristics of atmospheric turbulence and the effects of wind speed and direction on raindrops,explored the distribution characteristics of facade WDR for buildings with protruding roof,and quantified the deviation of the International Organization for Standardization(ISO)semi-empirical model for WDR prediction of buildings with protruding roof.The results show that there are great differences between the measured values of turbulence degree,gust factor and turbulence integral scale and the theoretical values based on ground measurements in the three types of rainfall events.The difference between the measured number of raindrops and that calculated by the standard M-P spectrum is up to 125.When the difference of wind speed and rain in-tensity is small,the WDR distribution of building facade is significantly affected by the angle between incoming flow and facade.Because the ISO semi-empirical model is built on the ground measurement,its prediction of WDR for buildings with protruding roof is biased,and the measured value is about twice of the ISO predicted value under the rainfall conditions applicable to the model.
关键词
建筑屋面/突出建筑/风驱雨(WDR)/现场实测
Key words
building roof/prominent building/wind-driven rain(WDR)/field measurement
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