- 摘 要
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（湖南科技大學(xué)土木工程學(xué)院， 湘潭 411201）
［摘要］為獲得低矮房屋屋面局部平均風(fēng)壓的分布規(guī)律，將體型比為1.5∶1∶1的低矮房屋屋面劃分成若干典型區(qū)域并進(jìn)行數(shù)值模擬研究。數(shù)值模擬結(jié)果與風(fēng)洞試驗(yàn)結(jié)果對比表明，采用兩種研究手段分析的結(jié)果吻合較好，從而驗(yàn)證了數(shù)值模擬技術(shù)在分析低矮房屋表面風(fēng)壓的可靠性。基于數(shù)值模擬，分析了七類不同屋面坡角低矮房屋在典型風(fēng)向角下屋面局部區(qū)域平均風(fēng)壓的分布規(guī)律。結(jié)果表明：屋面局部平均風(fēng)壓隨風(fēng)向角改變而變化明顯，且表現(xiàn)出一定的規(guī)律性；0°風(fēng)向角下，靠山墻B，E區(qū)域形成局部高吸力區(qū)；60°風(fēng)向角下，迎風(fēng)屋檐A區(qū)及屋角J區(qū)測點(diǎn)平均風(fēng)壓系數(shù)隨坡角的增大有明顯遞減趨勢，屋脊C，D區(qū)測點(diǎn)平均風(fēng)壓系數(shù)隨坡角的增大呈現(xiàn)出先增大后遞減的趨勢；90°風(fēng)向角下，迎風(fēng)屋檐A區(qū)及屋角J區(qū)各測點(diǎn)平均風(fēng)壓在45°坡角時均為正壓。研究結(jié)果可為我國沿海多發(fā)臺風(fēng)地區(qū)低矮房屋的抗臺風(fēng)設(shè)計(jì)提供依據(jù)。
［關(guān)鍵詞］風(fēng)工程; 低矮房屋; 平均風(fēng)壓系數(shù); 風(fēng)洞試驗(yàn); 湍流模型
中圖分類號：TU312+.1 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2014)19-0034-06
Numerical simulation and analysis of local mean wind pressure on the low-rise building roof
Dai Yimin, Yan Xuguang
(School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China)
Abstract: A comprehensive study of local mean wind pressure on the roof of the low-rise buildings with a 1.5∶1∶1 body type was performed by means of numerical simulation technique based on the roof dividing several typical zones. Compared with wind tunnel tests, the results obtained from the simulation matched well. The reliability of the numerical simulation in analysis wind pressures of a low-rise building was verified. Based on numerical simulation, the distributions of local mean wind pressure on the roof for 7 roof pitches at different azimuths were studied. Analysis results show that the variations of local mean wind pressure along with azimuths show some regularity. Local high suction regions are formed in B and E zones at azimuth 0°. For the azimuth 60°, the mean wind pressure coefficients of A and J zones decrease with the increase of roof pitch. And the mean wind pressures coefficients of C and D zones also first increase and after decrease with the increases of roof pitch. The mean wind pressures of A and J zones are positive in 45°roof pitch at azimuth 90°. The research provides a foundation for the anti-typhoon design of low-rise buildings in the coastal typhoon-prone regions in China.
Keywords: wind engineering; low-rise building; mean wind pressure coefficient; wind tunnel test; turbulence model
*國家自然科學(xué)基金項(xiàng)目（51248001），交通運(yùn)輸部科技項(xiàng)目（2011318824140），湖南科技大學(xué)項(xiàng)目（E51257;J11216）。
作者簡介：戴益民，博士，副教授，Email: dymzzy@163.com。
參考文獻(xiàn)
［1］KAREEM A, KIJEWSKI T. 7th US national conference on wind engineering: a summary of papers［J］. Journal of Wind Engineering and Industrial Aerodynamics, 1996, 62(2-3):81-129.
［2］CASE P C, ISYUMOV N.Wind loads on low buildings with 4:12 gable roofs in open country and suburban exposures［J］. Journal of Wind Engineering and Industrial Aerodynamics, 1998, 77-78:107-118.
［3］HOLMES J D. Wind pressure on tropical housing［J］. Journal of Wind Engineering and Industrial Aerodynamics, 1994, 53(1-2):105-123.
［4］SUN Y, YUKIO TAMURA, QUAN Y. The interference effect of surrounding roughness on wind pressures of rectangular prism［C］//BBAA VI International Colloquium on Bluff Bodies Aerodynamics & Applications. Milano, 2008:20-24.
［5］AIJ recommendations for loads on buildings［S］. Japan: Architectural Institute of Japan, 2004.
［6］RICHARDS P J, HOXEY R P.Wind loads on the roof of a 6m cube［J］. Journal of Wind Engineering and Industrial Aerodynamics, 2008，96(6-7)：984-993.
［7］ENDO M, BIENKIEWICZ B, HAM H J. Wind-tunnel investigation of point pressure on TTU test building［J］. Journal of Wind Engineering and Industrial Aerodynamics, 2006，94(7)：
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