（1 湖南大学土木工程学院，长沙 410082；2 广州市天作建筑规划设计有限公司，广州 510623；3 香港城市大学土木及建筑系，香港 999000）

［摘要］基于一个低矮房屋刚性模型风洞试验，研究了湍流场中低矮房屋屋盖角部未开孔和开孔时屋盖上的风荷载分布特性。研究结果表明：在斜风向作用下，屋盖迎风角部风荷载表现出复杂的三维特性，屋盖迎风角部也是较大风吸力作用的区域；湍流场中锥形涡之间在屋盖区域没有相互作用；采用二次曲线对涡核位置和再附位置进行拟合，拟合结果较好；屋盖内表面风荷载平均效应趋于均匀，脉动风压效应在时域和频域上表现出很高的相关性，并表现出明显的Helmholtz共振现象。

［关键词］低矮房屋; 斜风向; 柱状涡; 锥形涡; 屋盖; 开孔; 风荷载

中图分类号：TU973.32,TU247.1      文献标识码：A      文章编号：1002-848X(2014)19-0026-08

Experimental study on wind load characteristics of a low-rise building roof under oblique wind direction

Wang Yunjie1，2,  Li Qiusheng1,3

 (1 College of Civil Engineering, Hunan University, Changsha 410082, China; 2 Guangzhou TEAMZERO Architectural & Planning Co., Ltd., Guangzhou 510623, China; 3 Department of Civil and Architectural Engineering, City University of Hong Kong, Hong Kong 999000, China)

Abstract: Based on the wind tunnel test of the rigid model of a low-rise building, the wind load distribution characteristics of roofs with or without opening holes in the turbulence field were studied. Results show that the wind load on the windward corner of the roof shows complex three-dimensional characteristics under oblique wind direction and the windward corner of the roof is also the area which experiences high wind suction. It is proved by the wind tunnel test results that there is no interaction between conical vortexes in the roof area in turbulence field. The vortex core positions and reattachment areas are fit well with quadratic curves. Wind load average effects of internal surface of the roof tend to be uniform, while fluctuating wind pressure effect of the wind load demonstrates high correlations in the time domain and frequency domain and shows an obvious Helmholtz resonance phenomenon.

Keywords: low-rise building; oblique wind direction; cylindrical vortex; conical vortex; roof; opening hole; wind load

*国家自然科学基金面上项目（51178179）。

作者简介：王云杰，硕士研究生，Email：yunjiewang@yeah.net。

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