This paper comprehensively presents the results of a wind tunnel experiment of the wind pressure fluctuating characteristics of a long-span roof structure, namely the fluctuating wind pressure coefficient (FWPC), wind pressure power spectrum, and wind pressure coherence. The variation trend of FWPCs in the wind directions of 0°, 45°, and 90° were analyzed in sealed and open conditions, as well as the fluctuating wind pressure coefficients of lateral and longitudinal profiles of roof. Subsequently, the models of wind pressure spectrum in different zones and the spatial coherence of fluctuating wind pressure at different wind angles were discussed. The zone values of wind load shape factors of envelope structure with sealed, open, and pile of coal in open were calculated by area weighted averaging. The results indicate that the sealed condition significantly influences the fluctuating characteristics on the roof surface more than the open condition, suggesting that the maximum varied gradient of FWPCs is achieved in the 45° wind direction. Further, different forms and peak frequencies of the wind pressure spectrum in the roof region developed three zones, revealing that the peak frequency in energy-preserved, inertia, and energy-dissipated regions show an increasing trend for the different directions. The spatial correlations of wind pressure between measurement taps decrease with the increase in the frequency and spatial distance. Moreover, the correlation coefficients are lower than 0.2 when the frequency was higher than 35 Hz, and a modified three-dimensional spatial coherence function of wind pressure is proposed. In contrast to the sealed case, the zone values of wind load shape factors of envelope structure with open and pile of coal in open are alleviated due to the separation flows.

中文翻译：

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大跨度圆柱屋盖结构风压脉动特性及风荷载形状因子试验研究

本文综合介绍了大跨度屋盖结构风压脉动特性的风洞试验结果，即脉动风压系数（FWPC）、风压功率谱和风压相干性。分析了封闭和开放条件下FWPCs在0°、45°和90°风向的变化趋势，以及屋顶横向和纵向剖面的风压系数波动。随后，讨论了不同区域的风压谱模型和不同风角下风压脉动的空间相干性。采用面积加权平均法计算了封闭式、敞开式和敞开式煤堆围护结构风荷载形状因子的分区值。结果表明，密封条件比开放条件更显着影响屋顶表面的波动特性，表明在 45°风向实现了 FWPC 的最大变化梯度。此外，屋顶区域风压谱的不同形式和峰值频率发展为三个区域，表明能量保存区域、惯性区域和耗能区域的峰值频率向不同方向呈增加趋势。测量抽头之间风压的空间相关性随着频率和空间距离的增加而减小。此外，当频率高于35Hz时，相关系数小于0.2，提出了一种修正的风压三维空间相干函数。