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秦 云 張耀春 王春剛 （哈爾濱工業(yè)大學(xué)土木工程學(xué)院 150090）
[提要] 借助計(jì)算流體動(dòng)力學(xué)( CFD)大型商業(yè)軟件Fluent6.0，對大氣邊界層內(nèi)由兩平行面板組成的獨(dú)柱支承廣告牌的表面風(fēng)壓進(jìn)行了研究，發(fā)現(xiàn)結(jié)構(gòu)的雷諾數(shù)敏感性、地貌類別對結(jié)構(gòu)風(fēng)壓和風(fēng)致扭矩系數(shù)的影響可以忽略不計(jì)。在此基礎(chǔ)上，采用實(shí)體和面板兩種組合模式，以C類地貌邊界層剪切流為來流條件，深入研究了這種廣告牌在各種來流方向角下的表面風(fēng)壓分布，指出了兩種模式下風(fēng)荷載的差別，得到了結(jié)構(gòu)的總體平均和局部風(fēng)壓系數(shù)，給出了風(fēng)致剪力和扭矩的計(jì)算表達(dá)式。建議可供同類結(jié)構(gòu)抗風(fēng)設(shè)計(jì)時(shí)參考。
[關(guān)鍵詞] 計(jì)算流體動(dòng)力學(xué)( CFD) 風(fēng)壓數(shù)值模擬 廣告牌設(shè)計(jì) 風(fēng)致扭矩With the aid of Computational Fluid Dynamics( CFD) commercial large-scale software Fluent6.0, the surface pressures of billboards consisting of two parallel panels supported by single column in atmospheric boundary are analyzed. The results indicate that the sensation of Reynolds number( Re), the effects of terrain type on coefficients of wind pressure and the structure torque induced by wind can be neglected. Based on the solid and built-in panels modes, taking the shear flow in terrain C as the approaching flow, the distributions of wind pressure in various approaching directions are investigated thoroughly. The difference of wind load between the two modes' is identified. The total mean and local wind pressure coefficients are obtained, and formulas of shear force and torque induced by wind are proposed. The suggestions can be used as the references in similar structural design.
Keywords: computational fluid dynamics; wind pressure numerical simulation; billboard design; torque參 考 文 獻(xiàn)
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