《建筑结构荷载规范》围护构件风荷载的修订建议

Proposed revisions on wind load provisions for cladding and components in‘Load code for the design of building structures'

基于建筑围护构件风荷载的基础理论,对比分析了中外荷载规范的具体规定,指出了我国现行GB 50009—2012《建筑结构荷载规范》在围护构件风荷载规定方面存在的不足,提出了改进和完善的具体建议。建议如下:分别统计分析季风和台风两种气候的基本风速,再进行合并,得到混合气候地区的基本风速;将峰值因子的取值提高至3.5,能够比较真实地反映来流的脉动风速极值;借鉴国外荷载规范的规定,完善内压系数的相关规定;深入开展风向效应的研究,以气象观测资料和典型体型建筑物的风洞试验结果为依据,合理确定我国各地区各方向的风向折减系数;开展围护构件风荷载面积折减系数方面的研究,确定典型建筑物墙面、屋面不同区域的面积折减系数。

Based on the fundamental theory of wind load determination for the building cladding and components, the comparisons of the provisions associated with the components and cladding from the Chinese and international wind codes are performed. Accordingly, the/imitations and corresponding design suggestions for the Chinese load code are presented as follows： in typhoon-prone regions, it is better to divide the statistical analysis of basic wind speed into monsoon and typhoon. On this basis, the basic wind speed in the mixed climate regions can be determined through a combination between two types of wind speed. It is suggested to increase the peak factor to 3.5, which could relatively exactly evaluate the peak fluctuating wind speed. Referring to the international wind codes, the provisions related to the internal wind pressure coefficients should be improved. It is advised to peribrm the research on the wind directionality effect. Based on the data from meteorological observations and wind tunnel tests for typical buildings, the wind directionality reduction factors, which are adequate for different wind directions and regions in our country, are suggested to propose. It is suggested that the study should be conducted on the area reduction associated with the wind loads for building cladding and components to determine the area reduction factors for different wall and roof zones of typical buildings.