鼓形建筑的气动荷载特性及其干扰效应研究  

AERODYNAMIC CHARACTERISTICS AND INTERFERENCE EFFECT OF DRUM-SHAPED HIGH-RISE BUILDINGS

作　　者：陈元坤[1,2] 李霆 卢亦焱[2] 宋杰[2] 李宏胜 陈晓强[1] CHEN Yuan-kun;LI Ting;LU Yi-yan;SONG Jie;LI Hong-sheng;CHEN Xiao-qiang(Central-south Architectural Design Institute Co.Ltd.,Wuhan,Hubei 430071,China;School of Civil Engineering,Wuhan University,Wuhan,Hubei 430072,China)

机构地区：[1]中南建筑设计院股份有限公司,湖北武汉430071 [2]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《工程力学》2024年第8期68-79,共12页Engineering Mechanics

基　　金：国家自然科学青年基金项目(51608398);湖北省博士后创新实践岗位(第一批)。

摘　　要：通过多点同步测压风洞试验,系统分析了圆角率25%和50%的单个鼓形建筑表面风压、风荷载功率谱及整体力系数,并研究了两个鼓形建筑并排和串列布置时,不同间距和圆角率的两鼓形建筑的干扰效应。结果表明,鼓形建筑在降低圆角处平均风压的同时会使脉动风压峰值的位置向迎风端移动,且增大其峰值,造成圆角处较大的极值负压。鼓形建筑宽边迎风时横风向荷载Strouhal数较矩形建筑高,且随着圆角率增大而增大;窄边迎风时,鼓形建筑横风向荷载功率谱出现两个峰值,主峰值在fB/V_(h)=0.03附近,次级漩涡脱落形成的次峰值出现在fB/V_(h)=0.25。两个鼓形建筑并排布置时,鼓形建筑间的狭缝效应会大大增加两内侧的负压,尤其是对于圆角率50%的鼓形建筑。两建筑串列布置时,上游建筑的遮挡效应使下游迎风面的负压显著降低;由于受到上游建筑尾流的影响,下游建筑侧面迎风端的负压也大大低于单塔建筑。Employing the wind tunnel test of synchronous multi-pressure measurement system,the present research investigates the wind pressure,power spectral density(PSD)of wind loads,and wind force coefficient of drum-shaped high-rise buildings with a corner roundness ratio of 25%and 50%,respectively.Meanwhile,the interference effect of two drum-shaped buildings with different distance and corner roundness ratio is examined for two configurations,i.e.,parallel and tandem arrangements.Results show that the roundness can reduce the mean wind pressure at the rounded windward corner and make the peak of fluctuating wind pressure move windward,causing considerable peak suction at the windward rounded corner.When the long side is perpendicular to the approaching wind,Strouhal number of the cross-wind loads of drum-shape building is larger than that of the associated rectangular building,and Strouhal number increases with roundness ratio.When the short side is perpendicular to the approaching wind,PSDs of the cross-wind loads of the two drum-shaped buildings show two peaks:the dominant one is at fB/V_(h)=0.03,and the other minor one caused by the secondary vortex shedding is at fB/V_(h)=0.25.When two drum-shape buildings are in the parallel arrangement,the wind suction on the two inner faces is increased significantly by the channeling effect,especially for the buildings with corner roundness ratio of 50%.When two drum-shaped buildings are in the tandem arrangement,the shielding effect of the upstream buildings decreases the wind pressure on the windward face of the downstream building.In addition,the wind suction of the windward end of the downstream building is far smaller than that of the single isolated building because of the wake flow of the upstream building.

关 键 词：鼓形高层建筑 气动特性 干扰效应 风效应 风洞试验 

分 类 号：TU973.213[建筑科学—结构工程]