- 摘 要
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（1 同濟大學(xué)建筑工程系 上海 200092;2 同濟大學(xué)建筑設(shè)計研究院 上海 200092)
【提要】 風(fēng)荷載是控制大跨度鋼屋蓋結(jié)構(gòu)設(shè)計的主要荷載之一。結(jié)合北京大學(xué)體育館屋蓋結(jié)構(gòu)的風(fēng)洞模擬試驗，以屋蓋上的平均風(fēng)荷載和脈動風(fēng)荷載為研究對象，對屋蓋上的風(fēng)荷載分布特性進(jìn)行了詳盡的分析。結(jié)果認(rèn)為：整個屋蓋所受風(fēng)荷載主要以負(fù)壓為主，屋蓋懸挑部分在迎風(fēng)時產(chǎn)生“上吸下頂”的疊加作用，其他風(fēng)向為“上吸下吸”的抵消作用；屋蓋角部的風(fēng)荷載一般也很大，在結(jié)構(gòu)設(shè)計時應(yīng)采取必要的構(gòu)造措施；脈動風(fēng)荷載對于總的設(shè)計風(fēng)荷載來說不能忽略，準(zhǔn)定常理論不適合用來計算大跨度屋蓋的風(fēng)振響應(yīng)。
【關(guān)鍵詞】 大跨度屋蓋結(jié)構(gòu) 平均風(fēng)壓 脈動風(fēng)壓
Experimental Study on Characteristics of Wind Load Distribution on Peking University Gymnasium Roof/Fang Jiangsheng1，Ding Jiemin2(1 Department of Building Engineering，Tongji University，Shanghai 200092，China；2 The Architectural Design & Research Institute of Tongji University，Shanghai 200092，China)
Abstract:The wind load is one of the main control loads for the large span steel roof structure. Based on wind tunnel investigation of Peking University gymnasium roof,the mean wind loading and fluctuating wind loading are studied. The characteristics of wind load distribution are discussed. It shows that the suction is the main wind load on the whole
roof. The wind pressures on the upper and lower surfaces of the cantilevered part of the roof have superimposing effects on the windward direction and counteracting effect on leeward direction. The windresistant measures must be taken at the corner of the roof for supporting the larger wind load. The fluctuating wind pressure can't be neglected as for the whole wind load,and the quasisteady theory can't be used to calculate the wind induced vibration response of the large span steel roof structure.
Keywords:large span roof structure； mean wind pressure； fluctuating wind pressure
