双坡屋面低矮房屋围护结构风压系数极值中美规范对比

Comparison of Chinese and American codes for extreme value of wind pressure coefficient of enclosure structure of low-rise buildings with sloping roofs

以双坡屋盖低矮房屋围护结构为研究对象,基于风荷载设计基本理论和风洞试验数据,对中国规范和美国规范关于双坡屋盖风压系数极值规定进行对比,结果表明:相比于美国规范,中国规范对低矮建筑围护结构的风压系数极值的规定偏于不安全;在进行风荷载设计时,应对屋面的角部,屋面边缘部位,屋脊端部,屋脊中部,屋面中部以及墙面的端部和中部等部位进行分区处理。

The enclosure structure of low-rise buildings with sloping roofs was taken as the research object.Based on the basic theory of wind load design and wind tunnel test data,the extreme value of wind pressure coefficient of sloping roofs stipulated in Chinese and American codes were compared.Results show that the extreme value of wind pressure coefficient of low-rise buildings in Chinese code is unsafe compared with that in American code.The roof corners,roof edges,roof ridge ends,roof ridge middle parts,roof middle parts and wall ends and middle parts should be partitioned in wind load design.