典型体型高层建筑双层幕墙风压分布试验

为了明确高层建筑双层通风幕墙的风荷载取值以及与单层幕墙的差异,分别对具有弧形和L形廊道式双幕墙的圆柱形和矩形高层建筑进行风洞试验研究,通过对内外层幕墙平均风压、脉动风压随位置及风向角的分布,以及各测点全风向角下最大正、负风压的对比分析,结果表明:廊道内任意处,外幕墙内侧和内幕墙外侧承受的风压基本一致;在整体结构抗风计算时,风荷载可按相同体型单幕墙建筑的风载取值;双幕墙内幕墙的风载可按单幕墙下的进行取值,并将偏于安全.外幕墙的风载,对圆弧的中段或L形的长边,可按单幕墙的适当折减;对圆弧的端部或L形的拐角及短边,需要进行放大.

Wind tunnel test study on wind pressure distribution on double-skin facades of high-rise buildings with typical shapes

In order to determine the wind loads on double-skin facade with no-leakage air barrier and to predict the load difference between double-skin facade and single-skin facade,wind tunnel tests on a cylindrical and a rectangular tall building with arc-shape and L-shape double-skin facade respectively were carried out.The analysis was performed on the distributions for the mean and fluctuating wind pressure,the distributions for the extreme positive and negative wind pressures of the full range wind directions.The study indicates that pressures in the draught corridor that act on the external and internal facade at any point are almost the same.The wind load that acts on the whole structure can be decided the same as that of the building with single-skin facade and of the similar shape.The wind load carried by internal facade can be also decided the same as that of single-skin facade,and tends to be safe.And the wind load carried by external facade can make a discount when the facade locates at the middle of the arc-shape or the long side of the L-shape corridor,and should be amplified when the facade locates at the end of the arc-shape or the short side and the turning point of L-shape corridor.