建筑装饰条带对大跨屋盖表面风荷载特性影响的研究  

Research on the Effect of Building Decorative Strips on the Wind Load Characteristics of Surface of Long-Span Roofs

作　　者：王芳[1] 王思怡[1] 谢敬凯 朱旭辉 廖科[1] WANG Fang;WANG Siyi;XIE Jingkai;ZHU Xuhui;LIAO Ke(Nanchong Vocational and Technical College,Nanchong 637171,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]南充职业技术学院,四川南充637171 [2]西南交通大学土木工程学院,成都610031

出　　处：《工业建筑》2023年第8期82-88,227,共8页Industrial Construction

基　　金：国家自然科学基金项目(52078438)。

摘　　要：为研究建筑装饰条带对大跨屋盖风荷载特性的影响,基于大跨屋盖表面有无建筑装饰条带的刚性风洞测压试验结果,分别对比了两种工况下的平均风压、脉动风压、风压非高斯特性和极值风压的差异。结果表明:建筑装饰条带对风荷载的影响与风向角有关,在垂直于建筑装饰条带的方向会增大屋盖发生流动分离处的平均风压与脉动风压系数,并且会改变部分测点的高斯特性,让10%左右的高斯测点转化为非高斯测点;在平行于建筑装饰条带的方向会增大侧屋盖边缘以及屋盖中部的极值负压,但对另外垂直两侧屋盖边缘影响不大。总的来说,建筑装饰条带整体上不改变屋盖以负压为主的风荷载作用机理,但会增大最不利的极值负压,尤其是在部分边缘处可增大42%,对围护结构抗风设计极为不利。In order to study the effect of building decorative strips on the wind load characteristics of long-span roofs,the differences of average wind pressure,pulsating wind pressure,non-Gaussian characteristics of wind pressure and extreme wind pressure under two working conditions were compared based on the results of rigid wind tunnel pressure testing with and without building decorative strips on the surface of long-span roofs.The results showed that the effect of decorative building decorative strips on wind load was related to the wind angle,and the direction perpendicular to the building decorative strips would increase the average wind pressure and pulsating wind pressure coefficients,where the flow separation of the roof occurred.It would change the Gaussian characteristics of some measurement points,so that about 10%of Gaussian measurement points were converted into non-Gaussian measurement points.The direction parallel to the building decorative strips would increase the extreme negative pressure at the edge of the side roof and the middle of the roof.In general,the building decorative strips did not change the wind load mechanism of the roof mainly by negative pressure,but they increased the most unfavorable extreme negative pressure,especially at some edges by 42%,which was extremely unfavorable to the wind resistance design of the enclosure.

关 键 词：大跨屋盖 建筑装饰条带 风荷载 非高斯特性 极值风压 

分 类 号：TU312.1[建筑科学—结构工程]