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双层通风幕墙的抗风设计需考虑外层幕墙的内、外表面风压以及内层幕墙的外表面风压,其风荷载取值不同于普通单层幕墙,使得其风载取值变得复杂。通过多个不同截面形式的模型进行双层幕墙压力分布风洞试验研究。介绍风洞试验模型的设计及数据处理方法,着重分析一字形双层幕墙和L形双层幕墙的内外层幕墙的平均风压分布。试验结果表明:L形双层幕墙和一字形双层幕墙的平均风压分布有很大的不同。对于一字形双层幕墙,无论是正风压还是负风压,都主要作用在内幕墙上,外幕墙除拐角区域外所承担的风压很小。对于L形双层幕墙,其外幕墙的正风压要比内幕墙的风压大;负风压时,L形双层幕墙的短边区域是外幕墙所承担的风压大于内幕墙,其长边区域则是内幕墙所受的风压要大于外幕墙。
The wind resistance design of the double-ventilated curtain wall needs to consider the inner and outer surface wind pressure of the outer curtain wall and the outer surface wind pressure of the inner curtain wall. The wind load value is different from that of ordinary single-wall curtain wall so that the wind load value becomes complex. Wind tunnel experiment on pressure distribution of double-skin curtain wall is carried out through several models with different cross-sections. This paper introduces the design and data processing method of wind tunnel test model, and analyzes the average wind pressure distribution of inner and outer curtain walls of double-wall curtain wall and L-shaped double-wall curtain wall. The experimental results show that the distribution of the average wind pressure between the L-shaped double-wall curtain wall and the in-line double-wall curtain wall is quite different. For the double-headed curtain wall, whether it is positive pressure or negative pressure, are mainly used in the inner wall, the outer wall in addition to the corner area outside the wind pressure is small. For the L-shaped double-skin curtain wall, the positive wind pressure of the external curtain wall is greater than that of the internal curtain wall. When the negative wind pressure is applied, the short-side area of the L-shaped double curtain wall is the wind pressure of the external curtain wall being greater than the internal curtain wall. Border area is the wind pressure on the inside wall to be greater than the external walls.