某可开合大跨屋盖风压特性试验研究*
- 摘 要
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(1 湖南大学建筑安全与节能教育部重点实验室，长沙 410082； 2 香港城市大学建筑学及土木工程学系，香港； 3 长沙理工大学土木与建筑学院，长沙 410114)
［摘要］对一座可实现连续开启的大跨结构开合屋盖进行了4种开启状态下的风洞测压试验，详细研究了屋盖的风压特性。结果表明：屋盖完全开启会增大整体活动屋盖向上的平均风荷载，使其表面负风压区发生偏移，有效地降低固定屋盖的平均风压；整体屋盖测点风压非高斯特性随着屋盖完全开启趋于集中；三参数伽马和高斯分布能很好地描述开合屋盖表面风压概率特性；SadekSimiu法计算的峰值因子能更为安全地估计具有非高斯特性测点的极值风压；屋盖开启会增大活动屋盖凸起部位极值负风压，减弱固定屋盖极小值风压。［关键词］大跨结构; 开合屋盖; 风洞试验; 非高斯特性; 峰值因子中图分类号：TU973.32 文献标识码：A 文章编号：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
*国家自然科学基金资助项目(51408062, 51178179)，湖南省创新平台与人才计划项目（2015RS4050），中国博士后基金（2015M572238）。通讯作者：李秋胜，教授，博士生导师，Email: bcqsli@cityu.edu.hk。
