西南交通大学学报2017，Vol.52Issue(1)：83-90,8.DOI:10.3969/j.issn.0258-2724.2017.01.012
矩形断面高层建筑脉动风荷载频谱特性研究
Experimental Study of Spectral Characteristics of Fluctuating Wind Loads on High-Rise Building with Rectangular Section
摘要
Abstract
In order to study the effects of wind field characteristics and side ratio of rectangular section on the spectral characteristics of fluctuating wind loads for rectangular high-rise buildings,the pressure fluctuations on a stationary rigid model with cross configurations of 1 ∶ 2 and 2∶ 1 were measured by wind tunnel test for synchronous pressure measurement in simulated atmospheric boundary layer.Referring to the spectral model given by the Architectural Institute of Japan (AIJ),a simplified spectral expression of fluctuating across-wind loading of rectangular high-rise building was proposed by fitting the measured results.The experimental results show that the fluctuating along-wind load is mainly caused by longitudinal turbulence,and the spectrum of fluctuating along-wind load is consistent with those of incident turbulence.The formation mechanism of fluctuating across-wind loads is more complex,and there is vortex shedding,separation or reattachment on the sides of the rectangular prism.The dimensionless power spectral density and the Strouhal numbers are almost constant along the height.The values of Strouhal number are 0.128 and 0.069 7 respectively for the side ratios of 2∶1 and 1:2.关键词
矩形高层建筑/风洞试验/脉动风荷载/功率谱特性/数学模型Key words
high-rise building/wind tunnel test/fluctuating wind loads/spectral characteristic/mathematical model分类
建筑与水利引用本文复制引用
曾加东,李明水..矩形断面高层建筑脉动风荷载频谱特性研究[J].西南交通大学学报,2017,52(1):83-90,8.基金项目
国家自然科学基金资助项目(51278433,51478402) （51278433,51478402）
