本文選題：大跨建筑 + 外部平臺(tái)��； 參考：《湖南大學(xué)學(xué)報(bào)(自然科學(xué)版)》2016年11期

【摘要】：為了研究外部平臺(tái)寬度對(duì)大跨屋蓋風(fēng)荷載的影響,在B類地貌中對(duì)無(wú)平臺(tái)和5個(gè)典型平臺(tái)寬度下的剛性模型進(jìn)行風(fēng)洞測(cè)壓試驗(yàn),得到了各工況下的屋蓋表面平均風(fēng)壓系數(shù)和脈動(dòng)風(fēng)壓系數(shù).研究表明:外部平臺(tái)增大了大跨結(jié)構(gòu)屋蓋的平均風(fēng)荷載.隨著平臺(tái)寬度的增大,屋蓋的平均風(fēng)荷載先增大后減小.平臺(tái)寬度12m時(shí)最不利,其最大增幅達(dá)到33%.平臺(tái)寬度20m時(shí)增幅達(dá)到20%;外部平臺(tái)增大了大跨結(jié)構(gòu)屋蓋的脈動(dòng)風(fēng)荷載,平臺(tái)寬度12m時(shí)最不利,其增幅達(dá)到11%.平臺(tái)寬度20m時(shí),增幅為8%,其余平臺(tái)寬度下的增幅基本在5%以內(nèi).屋蓋背風(fēng)面邊緣的脈動(dòng)風(fēng)荷載隨著平臺(tái)寬度的增加而減小,平臺(tái)寬度20m時(shí)可達(dá)19%.
[Abstract]:In order to study the influence of the width of external platform on the wind load of large span roof, the wind tunnel pressure measurement tests were carried out on rigid models with no platform and five typical platform widths in class B landforms.The average wind pressure coefficient and pulsating wind pressure coefficient of roof surface are obtained under various working conditions.The results show that the external platform increases the average wind load of long span roof.With the increase of platform width, the average wind load of roof first increases and then decreases.When the width of the platform is 12m, the maximum increase of the platform is 33m.The external platform increases the fluctuating wind load on the roof of the long-span structure, and the most disadvantageous is when the width of the platform is 12m, the increase is 11.1%.When the width of platform is 20 m, the increase is 8%, and the increase of other platform width is within 5%.The pulsating wind load at the edge of the roof leeward decreases with the increase of the platform width, and can reach 19m when the platform width is 20m.
【作者單位】： 湖南大學(xué)建筑安全與節(jié)能教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51278190,51178180,51478179)~~
【分類號(hào)】：TU312.1

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