某可開合大跨屋蓋風(fēng)壓特性試驗研究*
時峰1，李秋勝1,2，陳伏彬1,3，李建成1
- 摘 要
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(1 湖南大學(xué)建筑安全與節(jié)能教育部重點實驗室，長沙 410082； 2 香港城市大學(xué)建筑學(xué)及土木工程學(xué)系，香港； 3 長沙理工大學(xué)土木與建筑學(xué)院，長沙 410114)
［摘要］對一座可實現(xiàn)連續(xù)開啟的大跨結(jié)構(gòu)開合屋蓋進行了4種開啟狀態(tài)下的風(fēng)洞測壓試驗，詳細研究了屋蓋的風(fēng)壓特性。結(jié)果表明：屋蓋完全開啟會增大整體活動屋蓋向上的平均風(fēng)荷載，使其表面負風(fēng)壓區(qū)發(fā)生偏移，有效地降低固定屋蓋的平均風(fēng)壓；整體屋蓋測點風(fēng)壓非高斯特性隨著屋蓋完全開啟趨于集中；三參數(shù)伽馬和高斯分布能很好地描述開合屋蓋表面風(fēng)壓概率特性；SadekSimiu法計算的峰值因子能更為安全地估計具有非高斯特性測點的極值風(fēng)壓；屋蓋開啟會增大活動屋蓋凸起部位極值負風(fēng)壓，減弱固定屋蓋極小值風(fēng)壓。［關(guān)鍵詞］大跨結(jié)構(gòu); 開合屋蓋; 風(fēng)洞試驗; 非高斯特性; 峰值因子中圖分類號：TU973.32 文獻標識碼：A 文章編號：1002-848X(2016)03-0081-08
Experimental study of wind pressure characteristics on a long-span retractable roofShi Feng1, Li Qiusheng1,2, Chen Fubin1,3, Li Jiancheng1(1 Key Laboratory of Building Safety and Energy Efficiency of Hunan University, Changsha 410082, China; 2 Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China; 3 School of Civil Engineering and Architecture, Changsha University of Science & Technology, Changsha 410114, China)Abstract:Wind tunnel tests of a long-span retractable roof structure with four continuous opening cases were conducted, and the wind pressure characteristics on the roof were investigated in detail. The results indicate that the fully open of the movable roof results in the increase of the total upward wind loads on the movable roof and makes the surface negative pressure zone deviated, while the mean wind pressures on the fixed roof are reduced effectively. The non-Gaussian feature of wind pressures on the whole roof tends to concentrate with the movable roof opening. 3-Parameters Gamma and Gaussian distributions are valid to describe the wind pressure probability characteristics on the retractable roof. The extreme wind pressures with non-Gaussian feature can be conservatively estimated with the peak factors which were calculated by the Sadek-Simiu method. For the case of the opening of the roof, the extreme negative wind pressures on the bulgy region of the movable roof are enlarged and minimum wind pressures on the fixed roof are reduced.Keywords: long-span structure; retractable roof; wind tunnel test; non-Gaussian feature; peak factor
*國家自然科學(xué)基金資助項目(51408062, 51178179)，湖南省創(chuàng)新平臺與人才計劃項目（2015RS4050），中國博士后基金（2015M572238）。通訊作者：李秋勝，教授，博士生導(dǎo)師，Email: bcqsli@cityu.edu.hk。
