（1 湖南大学建筑安全与节能教育部重点实验室， 长沙 410082; 2 长沙先导投资控股集团有限公司， 长沙 410082; 3 香港城市大学建筑学及土木工程学系， 香港 999077; 4 长沙理工大学土木与建筑学院， 长沙 410114）

［摘要］基于改进的试验装置模拟了低矮房屋模型屋盖角部突然开孔过程，研究了两种风场下瞬时风压变化及稳态阶段的风压特性。发现突然开孔时孔口处外压略有降低，瞬时内压出现脉冲负压和反向正压，导致屋盖整体风荷载发生瞬间突变；内压具有很强的相关性，孔口区域外压与内压相关性最高；内压相干函数曲线峰值与湍流强度密切相关；来流湍流强度较大时，屋盖内压功率谱衰减很快，斜风向下孔口的存在致使孔口区域外压谱能量稍微降低，风压谱能量与湍流强度正相关；在开孔率约4-8%时，屋盖角部开孔导致Helmholtz共振发生，获得的开孔惯性系数比墙面开孔情形大。

［关键词］瞬态内压； 风洞试验； 低矮房屋； 突然开孔

中图分类号：TU973-32文献标识码：A文章编号：1002-848X(2017)07-0101-08

Study on wind pressure characteristics of a low-rise building with  sudden opening on roof corner

Shi Feng1,2, Li Qiusheng1,3, Wang Xiangjun1, Chen Fubin4, Wu Ying1

（1 Key Laboratory of Building Safety and Energy Efficiency of Hunan University, Changsha 410082, China;2 Changsha Pilot Investment Holdings Group Co., Ltd., Changsha 410082, China; 3 Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong 999077, China;4 School of Civil Engineering and Architecture，Changsha University of Science ＆ Technology, Changsha 410114, China）

Abstract:Based on an improved test device to simulate a sudden opening on a low-rise building model roof corner， the transient wind-induced pressure response and wind pressure characteristics in steady state under two wind fields were studied. It turned out that the external wind pressures on the hole region reduced slightly while the sudden opening happened， and pulse negative and positive pressure appeared flashed， resulting in the whole wind loads on the roof abruptly changed. There was a strong correlation between wind-induced internal pressure  and the external pressure of the hole area had the highest correlation coefficients with internal pressure among the entire roof. The peak of internal pressure coherence function curve was closely related to turbulence intensity. The power spectrum of internal pressure attenuated soon seriously while turbulence intensity of approach flow became lager. Under an oblique direction， the spectrum of external pressure on the hole zone declined a little， and the pressure spectrum was positively related to turbulence intensity. As the opening ratio was about 4-8%， Helmholtz resonance occurred due to the opening on the roof corner， and the results indicated the inertia coefficient was larger than the opening in metope.

Keywords:transient internal pressure; wind tunnel test; low-rise building; sudden opening

*国家自然科学基金资助项目（51408062）,国家自然科学基金重大研究计划资助项目（91215302）,湖南省创新平台与人才计划项目（2015RS4050）,中国博士后基金（2015M572238）。

作者简介：时峰, 硕士研究生,中级工程师, Email:shifeng9108@163.com。