- 摘 要
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（1 湖南大學(xué)土木工程學(xué)院，長沙 410082；2 廣州市天作建筑規(guī)劃設(shè)計有限公司，廣州 510623；3 香港城市大學(xué)土木及建筑系，香港 999000）
［摘要］基于一個低矮房屋剛性模型風洞試驗，研究了湍流場中低矮房屋屋蓋角部未開孔和開孔時屋蓋上的風荷載分布特性。研究結(jié)果表明：在斜風向作用下，屋蓋迎風角部風荷載表現(xiàn)出復(fù)雜的三維特性，屋蓋迎風角部也是較大風吸力作用的區(qū)域；湍流場中錐形渦之間在屋蓋區(qū)域沒有相互作用；采用二次曲線對渦核位置和再附位置進行擬合，擬合結(jié)果較好；屋蓋內(nèi)表面風荷載平均效應(yīng)趨于均勻，脈動風壓效應(yīng)在時域和頻域上表現(xiàn)出很高的相關(guān)性，并表現(xiàn)出明顯的Helmholtz共振現(xiàn)象。
［關(guān)鍵詞］低矮房屋; 斜風向; 柱狀渦; 錐形渦; 屋蓋; 開孔; 風荷載
中圖分類號：TU973.32,TU247.1 文獻標識碼：A 文章編號：1002-848X(2014)19-0026-08
Experimental study on wind load characteristics of a low-rise building roof under oblique wind direction
Wang Yunjie1，2, Li Qiusheng1,3
(1 College of Civil Engineering, Hunan University, Changsha 410082, China; 2 Guangzhou TEAMZERO Architectural & Planning Co., Ltd., Guangzhou 510623, China; 3 Department of Civil and Architectural Engineering, City University of Hong Kong, Hong Kong 999000, China)
Abstract: Based on the wind tunnel test of the rigid model of a low-rise building, the wind load distribution characteristics of roofs with or without opening holes in the turbulence field were studied. Results show that the wind load on the windward corner of the roof shows complex three-dimensional characteristics under oblique wind direction and the windward corner of the roof is also the area which experiences high wind suction. It is proved by the wind tunnel test results that there is no interaction between conical vortexes in the roof area in turbulence field. The vortex core positions and reattachment areas are fit well with quadratic curves. Wind load average effects of internal surface of the roof tend to be uniform, while fluctuating wind pressure effect of the wind load demonstrates high correlations in the time domain and frequency domain and shows an obvious Helmholtz resonance phenomenon.
Keywords: low-rise building; oblique wind direction; cylindrical vortex; conical vortex; roof; opening hole; wind load
*國家自然科學(xué)基金面上項目（51178179）。
作者簡介：王云杰，碩士研究生，Email：yunjiewang@yeah.net。
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