镂空双层幕墙建筑风压分布及非高斯特性研究

Study on wind pressure distribution and non-Gaussian feature of hollow double-skin faade building

借助风洞动态同步测压试验,对某办公楼镂空外墙双层幕墙平均风压分布特性进行分析,根据测点风压时程及其概率密度分布,并基于第三、四阶矩统计量对脉动风压分布的非高斯特性进行了描述。结果表明,外层幕墙的内表面风压和内层幕墙的外表面风压几乎相等,外层幕墙的净风压很小;建筑双层幕墙的风压脉动非高斯性的区域主要为建筑迎风下游尾流区,而外层幕墙由于内外压平衡的原因,其内表面边缘位置基本符合高斯性。在进行幕墙结构设计时,应对非高斯分布区域的风荷载设计予以特别重视,以保证其安全性。

Wind tunnel dynamic synchronous pressure measurement test was carried out to research the average wind pressure distribution characteristics of a building with hollow double-skin faade. According to the wind pressure time history and probability density distribution of measuring points,the non-Gaussian characteristics of fluctuating wind pressure distribution were described based on the third and fourth order moment statistics. The results show that the inner surface wind pressure on outer faade is almost equal to the outer surface wind pressure on inner faade,and the net wind pressure on the outer faade is very small. Fluctuating wind pressure non-Gaussian region of building＇ s double-skin faade is mainly distributed in building＇ s windward downstream wake zone. Due to the internal and external wind pressure balance for the outer faade,the edge position of inner surface basically conforms to the Gaussian feature. In the design of faade structure,wind load design in non-Gaussian distribution area should be paid special attention to ensure its safety.