通过对体育场典型悬臂弧形挑篷模型的测压风洞试验,研究挑篷表面脉动风压的概率分布形式,确定威布尔分布较适合描述挑篷表面脉动风压的概率分布形式,总结出设定偏移量和形状参数及特征参数之间简单的线性关系,三参数的威布尔分布可以用设定偏移量这一单参数来表述.在此基础上确定了适用于挑篷表面最不利风荷载统计的峰值因子取值范围.
The probabilistic distribution of wind pressure fluctuations acting on arc grandstand-roofs of stadiums is studied on the basis of a wind tunnel test. Several typical models of arc grandstand-roofs with different parameters are tested in the wind tunnel in the simulated terrain categories B and D. Re- sults show that the Weibull distribution is applicable to describing the fluctuating wind pressure distri- butions, and a simple linear relationship exists between the offset and shape or scale parameter. Weibull distribution with three parameters is then expressed by a sole offset. Based on the one-parameter Weibull distribution, the reasonable peak factors reflecting the most unfavorable wind loads acting on the arc roofs are finally derived