- 摘 要
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（1 湖南大學建筑安全與節(jié)能教育部重點實驗室， 長沙 410082; 2 長沙先導投資控股集團有限公司， 長沙 410082; 3 香港城市大學建筑學及土木工程學系， 香港 999077; 4 長沙理工大學土木與建筑學院， 長沙 410114）
［摘要］基于改進的試驗裝置模擬了低矮房屋模型屋蓋角部突然開孔過程，研究了兩種風場下瞬時風壓變化及穩(wěn)態(tài)階段的風壓特性。發(fā)現(xiàn)突然開孔時孔口處外壓略有降低，瞬時內(nèi)壓出現(xiàn)脈沖負壓和反向正壓，導致屋蓋整體風荷載發(fā)生瞬間突變；內(nèi)壓具有很強的相關性，孔口區(qū)域外壓與內(nèi)壓相關性最高；內(nèi)壓相干函數(shù)曲線峰值與湍流強度密切相關；來流湍流強度較大時，屋蓋內(nèi)壓功率譜衰減很快，斜風向下孔口的存在致使孔口區(qū)域外壓譜能量稍微降低，風壓譜能量與湍流強度正相關；在開孔率約4-8%時，屋蓋角部開孔導致Helmholtz共振發(fā)生，獲得的開孔慣性系數(shù)比墻面開孔情形大。
［關鍵詞］瞬態(tài)內(nèi)壓； 風洞試驗； 低矮房屋； 突然開孔
中圖分類號：TU973-32文獻標識碼：A文章編號：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
*國家自然科學基金資助項目（51408062）,國家自然科學基金重大研究計劃資助項目（91215302）,湖南省創(chuàng)新平臺與人才計劃項目（2015RS4050）,中國博士后基金（2015M572238）。
作者簡介：時峰, 碩士研究生,中級工程師, Email:shifeng9108@163.com。
