局部外形特征对高层建筑立面上围护结构风荷载的影响

Effects of local shape characteristics on wind loads on the facades of high-rise buildings

基于一外形复杂的高层建筑刚性模型表面压力测量风洞试验,对高层建筑立面上测点的最不利风压系数进行了研究,分析了局部外形特征对高层建筑立面上围护结构风荷载的影响。试验结果表明,最不利正风压系数不受建筑立面局部外形特征的影响,可以基于来流湍流特征用准定常理论近似预测。最不利负风压系数与尾流分离有关,受建筑局部外形特征的影响较大,平直立面上的小,弧形立面上的大。这些结论为高层建筑围护结构的设计提供了参考。

Based on the surface pressure measurement results in wind tunnel tests of the rigid model of a real high-rise building with complex shape,the most unfavorable pressure coefficients on measured taps were analyzed and the effects of the local shape of facades on the most unfavorable pressure coefficients were studied.The results show that the most unfavorable positive pressure coefficients are not affected by the local shape of facades and can be approximately estimated with the quasi-steady method.The most unfavorable negative pressure coefficients differ seriously as the local shape of facades changes and those on flat facade are small,while large on curved one.These conclusions provide the basis for cladding design of high-rise buildings.