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（1 長安大學(xué)，西安710064；2 中國建筑西北設(shè)計(jì)研究院，西安710003）

［提要］根據(jù)榆林機(jī)場航站樓風(fēng)洞試驗(yàn)結(jié)果，詳細(xì)分析了大跨弧形屋面及弧形挑篷上的平均風(fēng)荷載、脈動(dòng)風(fēng)荷載及其極值分布，研究了平均風(fēng)荷載、脈動(dòng)風(fēng)荷載的分布特性。根據(jù)分析可知，大跨弧形屋面上同時(shí)存在壓力和吸力，壓力主要分布在屋面弧面起坡處，吸力主要分布在屋面挑篷部位；大跨弧形屋面的峰值吸力對風(fēng)向角的變化特別敏感。給出了100年重現(xiàn)期屋面極值風(fēng)荷載等壓線圖和體型系數(shù)，所得結(jié)論對于西部地區(qū)此類結(jié)構(gòu)的抗風(fēng)設(shè)計(jì)有參考作用。

［關(guān)鍵詞］風(fēng)荷載；風(fēng)洞試驗(yàn)；體型系數(shù)

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