高层矩形建筑横风向风力特性试验研究  

Wind tunnel test study on across-wind loads of rectangular super high-rise buildings

作　　者：严亚林[1] 金新阳[1] 唐意[1] 武林[1] 

机构地区：[1]中国建筑科学研究院建研科技股份有限公司,北京100013

出　　处：《建筑结构》2011年第11期118-120,171,共4页Building Structure

基　　金：国家自然科学基金重大研究计划面上项目(9081505)

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。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.

关 键 词：超高层建筑 厚宽比 功率谱 相关系数 相干函数 

分 类 号：TU312.1[建筑科学—结构工程] TU973.213