摘要
为了研究大跨开合屋盖风荷载特性以及屋盖开洞对风荷载分布的影响,设计了一个可改变屋盖开合的大跨结构模型,并在大气边界层风洞中开展了不同流场与不同开合工况下的刚性模型测压试验,获得了表面风压分布时程数据。详细分析了建筑表面平均风压系数与脉动风压系数,深入讨论了屋面开合对风压分布的影响。研究结果表明,当来流垂直于屋盖前缘时,形成明显的柱状涡,随着来流角度增大,在屋盖角部形成锥形涡,在45°斜风下锥形涡达到最强;受到特征湍流的作用,均匀流场下屋盖表面的平均风吸力较大;随着湍流强度的提高,受到来流湍流的抑制作用,风压系数有所降低,在C类流场下最为明显;屋面开口降低了孔口附近平均风压,而脉动风压则有所增大。
A rigid model of large-span roof structure which can change the opening on the roof was designed,and wind tunnel tests with cases of different wind flow and different opening were conducted in the boundary layer wind tunnel,and the wind load data of largespan retractable roof was obtained,for the purpose of investigations on characteristics of wind loads on large-span roof structure and wind loads distribution influenced by the opening.The mean wind pressure coefficients and fluctuating wind pressure coefficients were analyzed,and the wind pressures influenced by the opening were discussed in detail.The results indicate that：the cylindrical vortices near the leading edge of the roof with the perpen-dicular approaching flow can be found,the conical vortices are found with the increase of the wind direction,and the largest in wind direction of 45°.The mean negative wind pressure is high which is effected by the signature turbulence in free stream.The wind pressure coefficients reduce with the approaching wind turbulence increase,especially for terrain C.The mean wind pressures near the opening reduce for the open case,and the fluctuating wind pressure increase.
作者
蔡虬瑞
陈伏彬
彭灵
李秋胜
张明亮
林立
CAI Qiu-rui;CHEN Fu-bin;PENG Ling;LI Qiu-sheng;ZHANG Ming-liang;LIN Li(School of Civi l Engineering？ Changsha University of Science and Technology,Changsha 410114,China;Department of Architecture and Civi l Engineering,City University of Hong Kong,Hong Kong 999077,China;Hunan Construction Engineering Group,Changsha 410004,China;Institute of Civil Engineering and Architecture,Xiamen University of Technology,Xiamen 361000,China)
出处
《长沙理工大学学报（自然科学版）》
CAS
2018年第2期58-66,共9页
Journal of Changsha University of Science and Technology:Natural Science
基金
国家自然科学基金资助项目(51778072,51408062)
中国博士后基金项目(2015M572238)
湖南省创新平台与人才计划项目(2015RS4050)
长沙理工大学土木工程湖南省优势特色重点学科创新性项目
湖南省研究生科研创新项目(CX2016B397)
福建省建筑产业化闽台科技合作基地开发基金项目
关键词
大跨开合屋盖
风荷载
平均风压系数
脉动风压系数
来流湍流
特征湍流
风洞试验
large-span retractable roof
wind load
mean wind pressure coefficient
fluctua-ting wind pressure coefficient
approaching wind turbulence
signature turbulence
wind tunnel test
