（1 长安大学，西安710064；2 中国建筑西北设计研究院，西安710003）

［提要］根据榆林机场航站楼风洞试验结果，详细分析了大跨弧形屋面及弧形挑篷上的平均风荷载、脉动风荷载及其极值分布，研究了平均风荷载、脉动风荷载的分布特性。根据分析可知，大跨弧形屋面上同时存在压力和吸力，压力主要分布在屋面弧面起坡处，吸力主要分布在屋面挑篷部位；大跨弧形屋面的峰值吸力对风向角的变化特别敏感。给出了100年重现期屋面极值风荷载等压线图和体型系数，所得结论对于西部地区此类结构的抗风设计有参考作用。

［关键词］风荷载；风洞试验；体型系数

Experimental Investigation on Characteristics of Wind Loads on Large Arc Roof /Pan Yuan1，Zhang Shunqiang2,Xue Zhongxing2（1 Chang"an University,Xi"an 710064,China; 2 China Northwest Building Design Research Instutute, Xi"an  710003,China)

Abstract:Based on wind tunnel investigation of Yulin airport terminal old buildings, the mean wind loading, the dynamic wind loading and extreme value distribution of the large arc roof are studied. Compressive stress and suction force are concurrence on the large arc roof by analysis. Compressive stress distributes on the start of arc, and suction force distributes on the overhang. Peak suction is in particular sensitive to wind direction. It presents wind load"s extremum and shape coefficient in 100year design reference period. The conclusion  supplies references to similar structures in design of resisting wind at westward region.

Keywords:airport terminal building; wind load; wind tunnel test; shape coefficient