- 摘 要
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陳 凱1，何連華1，符龍彪1，潘國華2，陶 勇2，鮑華2，郭盛2，石城林2
（1 中國建筑科學(xué)研究院，北京100013； 2 中鐵第四勘察設(shè)計(jì)院集團(tuán)有限公司，武漢430063）[摘要] 通過風(fēng)洞試驗(yàn)研究了武漢火車站屋蓋和雨棚的表面風(fēng)荷載分布特征，著重分析了大型懸挑和鏤空吊頂對風(fēng)壓分布的影響。屋蓋的大型懸挑對局部風(fēng)壓影響很大，當(dāng)來流斜吹時，懸挑局部區(qū)域的體型系數(shù)可達(dá)- 2.2，而由于玻璃幕墻的阻擋作用，懸挑下方在某些風(fēng)向會產(chǎn)生0.6的正壓體型系數(shù)。下表面鏤空時的上表面內(nèi)側(cè)風(fēng)壓和密閉時的下表面風(fēng)壓基本一致。在整體設(shè)計(jì)時，可按封閉模型的試驗(yàn)結(jié)果進(jìn)行取值。通過對總受力和壓力方差的統(tǒng)計(jì)分析，獲得了不同風(fēng)向下結(jié)構(gòu)受風(fēng)力作用的大小和離散程度，可為評估不利風(fēng)向角提供重要參考依據(jù)。
[關(guān)鍵詞] 大跨度空間結(jié)構(gòu)；風(fēng)洞試驗(yàn)；懸挑；鏤空結(jié)構(gòu)；不利風(fēng)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
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