［摘要］在边界层风洞中对10个典型超高层建筑模型进行测压试验，获得了测点层的顺风向、横风向和扭转方向的风荷载，整理了横风向风荷载的功率谱、相关系数和水平、竖向相干函数，分析了流场绕流的特点，总结了横风向风力对扭转的贡献。得到如下结论：选取分离点作为参考点时，横风向水平相关性随厚宽比增加变化较大，通过确定其零点位置可以定量确定再附点位置；横风向风力竖向相关性受所选基点位置影响程度较小；竖向相干性随厚宽比增大而降低；模型厚宽比大于 1.5时，结构扭矩谱几乎全部由横风向贡献。
［关键词］超高层建筑; 厚宽比; 功率谱; 相关系数; 相干函数
中图分类号：TU312.1, TU973.213 文献标识码： A文章编号：1002-848X(2011)11-0118-03
Wind tunnel test study on across-wind loads of rectangular super high-rise buildings
Yan Yalin, Jin Xinyang, Tang Yi, Wu Lin(CABR Technology Co., Ltd., China Academy of Building Research, Beijing 100013, China)
Abstract：Based on 10 pressure tests in boundary layer wind tunnel for rectangular super highrise buildings, wind loads in along-wind, across-wind and torsional directions were calculated. Across-wind load power spectrum, relation coefficient and coherent function in horizontal and vertical were analyzed for the character of the wind flow field. Contribution of across-wind force for torsion was summarized. The summarized results indicate that across-wind horizontal relation coefficient varies with the depth-width ratio while the reference point is at separation point, and the reattachment can be found at the point where the relation coefficient equals to zero. Across-wind vertical relation coefficient varies little with reference point, and coherent coefficient decreases with increase of depth-width ratio. When depth-width ratio is greater than 1.5, the torsion spectrum are almost contributed by the across wind.
Keywords: super high-rise building; depth-width ratio; power spectrum; relation coefficient; coherent function
*国家自然科学基金重大研究计划面上项目(9081505)。
作者简介：严亚林（1985-）,男，博士生，研究方向：风工程与荷载,Email:yanyalin@cabrtech.com。
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