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考虑幕墙开洞的大跨屋盖结构风荷载特性研究*
张明亮1,2,3,李秋胜4,陈伏彬3
摘 要

(1 湖南建工集团有限公司, 长沙 410004; 2 湖南大学土木工程学院, 长沙 410082;3 长沙理工大学土木工程学院, 长沙 410114; 4 香港城市大学土木及建筑工程系, 香港 999077)

[摘要]基于不同幕墙开洞率的刚性模型风洞试验,研究了不同幕墙开洞率对大跨屋盖结构风荷载特性的影响。研究结果表明,在迎风面幕墙突然开洞时,内压时程有明显的突变,但开洞位置处于侧风向墙体时变化较小;对测点的内压系数功率谱分析发现,屋盖共振频率均出现在30~40Hz之间;内压脉动能量随迎风面幕墙开洞率的增大而增大;突然开洞时瞬态内压的脉动能量在低频段衰减较为明显。通过对比内压系数试验值与国内外荷载规范规定值发现:四周封闭时内压系数试验值均大于国内外规范规定值。研究结果对有幕墙开洞的大跨屋盖结构的抗风设计及荷载规范中关于有洞口建筑内压的修订均具有一定的参考借鉴意义。

[关键词]大跨屋盖; 突然开洞; Helmholtz频率; 功率谱; 风致内压

中图分类号:TU312-1文献标识码:A文章编号: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

 

*国家自然科学基金创新研究群项目(51778072,51408062),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:张明亮,博士,高级工程师,Email:hnjgzml@163.com。

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