杭州亚运轮滑馆复合曲面屋盖围护结构风荷载研究

Research on wind load of composite curved roof envelope of Hangzhou Asian Games Roller Skating Stadium

杭州亚运轮滑馆屋盖是由多个曲面叠合而成的复杂大跨屋盖结构.采用风洞试验方法测得了屋盖表面各测点的风压时程;对测点风压时程的概率密度分布特点进行对比分析,发现多数测点具有明显的非高斯特性.如对这些测点采用常规的峰值因子法计算围护结构的极值风压,将会明显低估其负压值.引入偏度与峰度概念,提出了一种简便但更有效的方法用以判定高斯和非高斯测点.对于非高斯测点,采用Gumbel拟合法计算其极值风压.结果表明,相比于峰值因子法,该方法不仅准确有效,完全达到期望的保证率,而且流程简单,便于工程应用.

The roof of Hangzhou Asian Games Roller Skating Stadium is a complex large-span roof structure formed by superimposing multiple curved surfaces. In this paper, the wind pressure time histories of all measuring points on the roof surface have been measured by the wind tunnel test technique. By comparing and analyzing the probability density distribution characteristics of the wind pressure time histories, it is found that most of the measuring points have obvious non-Gaussian characteristics. If the conventional peak factor method is used to estimate the extreme wind pressure of the envelope structure at these points, the negative pressure values will be significantly underestimated. This paper introduces the concepts of skewness and kurtosis, and proposes a simple but more effective method for determining the Gaussian and non-Gaussian points. For non-Gaussian points, the Gumbel fitting method is employed for estimation of the extreme wind pressure. Results show that in comparison with the peak factor method, this method is accurate and effective, with the expected guarantee rate being fully achieved, and has a simple procedure which is convenient for engineering application.