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(1 湖南大學(xué)建筑安全與節(jié)能教育部重點(diǎn)實(shí)驗(yàn)室， 長沙 410082；  2 香港城市大學(xué)， 香港 999077)

［摘要］采用大渦模擬(LES)方法，以長寬高之比為1-0∶1-0∶0-5的平屋蓋建筑為對(duì)象，在建筑立面上引入陽臺(tái)后，對(duì)不同風(fēng)向角下模型表面的風(fēng)荷載進(jìn)行了數(shù)值模擬計(jì)算。通過與風(fēng)洞試驗(yàn)結(jié)果的對(duì)比發(fā)現(xiàn)，大渦模擬能較好地預(yù)測建筑物表面的風(fēng)壓分布。在此基礎(chǔ)上，重點(diǎn)探討了不同風(fēng)向角下立面陽臺(tái)對(duì)建筑物表面風(fēng)壓和繞流風(fēng)場的影響，同時(shí)考慮了不同來流風(fēng)場條件的變化對(duì)陽臺(tái)作用效應(yīng)的影響。研究結(jié)果表明，立面陽臺(tái)的引入會(huì)明顯改變氣流在建筑表面的分離、再附著形式，使得表面風(fēng)壓沿高度方向上的分布發(fā)生變化；引起的變化主要集中在建筑物的迎風(fēng)面，特別是在迎風(fēng)面最上面一排陽臺(tái)及其以上區(qū)域；隨著來流風(fēng)向角的增加，陽臺(tái)對(duì)建筑迎風(fēng)面上風(fēng)壓的影響逐漸加大。

［關(guān)鍵詞］大渦模擬； 陽臺(tái)； 風(fēng)荷載； 數(shù)值模擬； 迎風(fēng)面

中圖分類號(hào)：TU311-41文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)07-0092-09

Numerical simulation study of the effect of balconies on wind loadings on surfaces of low-rise buildings

Liu Shun1, Li Qiusheng1,2

(1 Key Laboratory of Building Safety and Energy Efficiency of Hunan University, Changsha 410082, China;2 City University of Hong Kong, Hong Kong 999077, China)

Abstract:Using the large eddy simulation (LES) method, a series of numerical simulation calculations were conducted on the wind loadings with different wind angles on flat roof building (length∶width∶height=1-0∶1-0∶0-5) with balconies in building facades. It is shown that LES can well predict wind pressure distribution on building surfaces when compared with the wind tunnel test results. Based on this, the effects of facade balcony on the wind pressure and wind flow on the surface of the building under different angles of wind directions were discussed. At the same time, the influence of change of different flow field conditions on the effect of the balcony was considered. The results show that the introduction of the facade balcony will obviously change the separation and reattachment of the airflow on the surface of the building, so that the distribution of the wind pressure on surface along the height direction changes. The change mainly concentrates on the windward facade of the building, especially in the top row of the balcony in the windward facade and the areas above. With the increase in the angles of wind directions of incident wind flow, the effect of balconies on the wind pressure on the windward fa-ade of the building gradually increases.

Keywords:large eddy simulation; balcony; wind loading; numerical simulation; windward facade

*國家自然科學(xué)基金資助項(xiàng)目(51408062, 51178179)。

通訊作者：李秋勝，教授，博士生導(dǎo)師，Email: bcqsli@cityu.edu.hk。