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（1 湖南建工集團有限公司， 長沙 410004； 2 湖南大學土木工程學院， 長沙 410082；3 長沙理工大學土木工程學院， 長沙 410114； 4 香港城市大學土木及建筑工程系， 香港 999077）
［摘要］基于不同幕墻開洞率的剛性模型風洞試驗，研究了不同幕墻開洞率對大跨屋蓋結(jié)構(gòu)風荷載特性的影響。研究結(jié)果表明，在迎風面幕墻突然開洞時，內(nèi)壓時程有明顯的突變，但開洞位置處于側(cè)風向墻體時變化較?。粚y點的內(nèi)壓系數(shù)功率譜分析發(fā)現(xiàn)，屋蓋共振頻率均出現(xiàn)在30～40Hz之間；內(nèi)壓脈動能量隨迎風面幕墻開洞率的增大而增大；突然開洞時瞬態(tài)內(nèi)壓的脈動能量在低頻段衰減較為明顯。通過對比內(nèi)壓系數(shù)試驗值與國內(nèi)外荷載規(guī)范規(guī)定值發(fā)現(xiàn)：四周封閉時內(nèi)壓系數(shù)試驗值均大于國內(nèi)外規(guī)范規(guī)定值。研究結(jié)果對有幕墻開洞的大跨屋蓋結(jié)構(gòu)的抗風設(shè)計及荷載規(guī)范中關(guān)于有洞口建筑內(nèi)壓的修訂均具有一定的參考借鑒意義。
［關(guān)鍵詞］大跨屋蓋； 突然開洞； Helmholtz頻率； 功率譜； 風致內(nèi)壓
中圖分類號：TU312-1文獻標識碼：A文章編號：1002-848X(2018)06-0097-07
Study of wind load characteristics on large-span roof structure with curtain wall openings
Zhang Mingliang1,2,3, Li Qiusheng4, Chen Fubin3
(1 Hunan Construction Engineering Group Co., Ltd., Changsha 410004, China; 2 College of Civil Engineering, Hunan University, Changsha 410082, China; 3 College of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China; 4 Department of Civil and Architectural Engineering, City University of Hong Kong, Hong Kong 999077, China)
Abstract:Based on rigid model of wind-tunnel tests for a large-span roof structure with different curtain wall opening rates, influences of different curtain opening rates on wind load characteristics of large-span roof structure were studied. The results show that when there are sudden openings in windward curtain wall, the internal pressure time-history changes obviously, but there is little change when the openings locate in crosswind curtain wall. According to the power spectrum analysis of the internal pressure coefficient at the measuring point, the resonance frequency appears in the range of 30～40Hz. The internal pressure pulsation energy increases with the increase of the opening ratio of the windward curtain wall. The transient energy of the transient internal pressure suddenly attenuates when there are sudden openings. By comparing the test results of internal pressure coefficient and the stipulated values of load specifications both at home and abroad, it is found that the test values of internal pressure coefficient in a closed environment are all larger than those specified by domestic and foreign norms. The research results can be used for reference in the design of wind resistant large-span roof structures with curtain walls and the revision of the internal pressure of buildings with openings in load codes.
Keywords:large-span roof; sudden opening; Helmholtz frequency; power spectrum; wind-induced internal pressure
*國家自然科學基金創(chuàng)新研究群項目（51778072,51408062），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：張明亮，博士，高級工程師，Email：hnjgzml@163.com。
