陈 凯¹，何连华¹，符龙彪¹，潘国华²，陶  勇²，鲍华²，郭盛²，石城林²
（1 中国建筑科学研究院，北京100013； 2 中铁第四勘察设计院集团有限公司，武汉430063）

[摘要]  通过风洞试验研究了武汉火车站屋盖和雨棚的表面风荷载分布特征，着重分析了大型悬挑和镂空吊顶对风压分布的影响。屋盖的大型悬挑对局部风压影响很大，当来流斜吹时，悬挑局部区域的体型系数可达- 2.2，而由于玻璃幕墙的阻挡作用，悬挑下方在某些风向会产生0.6的正压体型系数。下表面镂空时的上表面内侧风压和密闭时的下表面风压基本一致。在整体设计时，可按封闭模型的试验结果进行取值。通过对总受力和压力方差的统计分析，获得了不同风向下结构受风力作用的大小和离散程度，可为评估不利风向角提供重要参考依据。
[关键词]  大跨度空间结构；风洞试验；悬挑；镂空结构；不利风向角

    Wind tunnel study of wind loading on the roof system of Wuhan ranvay station
    Chen Kail ,He Lianhual ,Fu Longbiaol ,Pan Guohua2 ,Tao Yong2 ,Bao Hua2 ,Guo Sheng2 ,Shi Chenglin2
    (1  China Academy of Building Research ,Beijing 100013 ,China; 2 China Railway Siyuan Survey and Design Institute Croup Co. /td. ,Wuhan 430063 ,China)

Abstract:  Awind tunnel test was carried out to investigate the wind loading on the mof system of Wuhan railway station ,especially focusing on the effects of the large suspended roof and the permeability ceiling.  rlhe suspended mof significantly affected the loca wind pressure. The shape factor of  -2.2 was found on the large suspended roof when the wind direction was inclined to the roof edge and the shape factor of 0.6appeared at certain wind direction because of the blocking effect of the gass facade. The inner pressure of the upside roof with permeability ceiling was approximately equal to the outer pressure of the underside roof with impermeability ceiling.   Ihe results obtained with impermeability ceiling can be directly referenced for the structural design of wind loading. A statistics analysis of wind pressure was carried out to reveal the strength and dispersion of the wind force and the unfa\orable wind direction was found accordingly.
Key\wrds:  large spatial structure;wind tunnel test;suspended roof; permeability structure;urfavorable wind direction