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以杭州新火车东站为例进行风洞试验,研究大跨度屋盖结构表面风压的非高斯分布特性及峰值因子计算方法。分别通过基于零穿越率的峰值因子法、改进峰值因子法、Sadek-Simiu法和基于经典极值理论的改进Gumbel法对各风向角下风压数据的峰值因子进行了估计,并在改进峰值因子法的基础上提出了偏度非高斯峰值因子法。对各种方法的适用性及计算结果进行对比分析表明,改进峰值因子法并不适用于峰度小于3的过程。提出的偏度非高斯峰值因子法与Sadek-Simiu法相比,计算结果十分吻合,而且对高斯过程同样适用,无需对屋盖测点进行高斯与非高斯分区。在应用时由于无需编程、计算量小、适用性好,更方便工程设计使用。
Taking Hangzhou New Railway Station as an example, a wind tunnel test is carried out to study the non-Gaussian distribution of wind pressure on the long-span roof structure and the calculation method of peak factor. The peak factor of wind pressure data under each wind direction angle was estimated by the crest factor method based on zero crossing rate, the improved crest factor method, the Sadek-Simiu method and the improved Gumbel method based on the classical extreme value theory respectively. In the improved crest factor method Based on the proposed non-Gaussian skewness peak factor method. The comparative analysis of the applicability of various methods and calculation results shows that the improvement of peak factor method is not suitable for the process of kurtosis less than 3. The proposed non-Gaussian peak factor method is in good agreement with the Sadek-Simiu method and is also applicable to the Gaussian process without Gaussian and non-Gaussian partitioning of the roof measuring points. In the application due to no programming, a small amount of calculation, applicability, and more convenient for engineering design and use.