長寬比對矩形截面高層建筑表面風(fēng)壓分布的影響研究*
沈國輝1，羅蔣皓2，錢濤3，余世策1，樓文娟1
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（1 浙江大學(xué)土木工程學(xué)系，杭州 310058； 2 重慶市設(shè)計院，重慶 400015；3 中國漢嘉設(shè)計集團(tuán)，杭州 310005）
［摘要］為了研究長寬比對矩形截面高層建筑表面風(fēng)壓分布的影響，進(jìn)行7個長寬比建筑的風(fēng)洞試驗，分析長邊和短邊正迎風(fēng)時各立面的風(fēng)壓分布，從短邊正迎風(fēng)時側(cè)風(fēng)面的風(fēng)壓分布研究氣流的分離和再附，計算得到面體型系數(shù)，并將面體型系數(shù)與荷載規(guī)范值進(jìn)行比較。研究表明：短邊正迎風(fēng)時，迎風(fēng)面的風(fēng)壓分布與長寬比無關(guān)，背風(fēng)面風(fēng)壓比較均勻，長寬比越大負(fù)平均風(fēng)壓系數(shù)絕對值越小；當(dāng)長寬比大于4:1時，側(cè)風(fēng)面負(fù)風(fēng)壓絕對值由大變小再變大，氣流發(fā)生分離、附著、再分離。試驗獲得的迎風(fēng)面體型系數(shù)隨著深寬比的增大而增大，背風(fēng)面體型系數(shù)隨深寬比的分布總體上與荷載規(guī)范一致。［關(guān)鍵詞］高層建筑; 風(fēng)洞試驗; 體型系數(shù); 風(fēng)壓系數(shù); 矩形截面中圖分類號：TU312+.1 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2015)13-0067-06
Research on influence of length to width ratios on wind pressure distribution of rectangular sectioned high-rise buildingsShen Guohui1, Luo Jianghao2, Qian Tao3, Yu Shice1, Lou Wenjuan1（1 Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China; 2 Chongqing Architectural Design Institute, Chongqing 400015, China; 3 HanJia Design Group of China, Hangzhou 310005, China)Abstract:In order to study the influence of length-to-width ratio on the wind pressure distribution of rectangular-sectioned high-rise buildings, wind tunnel tests of seven buildings with various length-to-width ratios were done. The wind pressure distributions on various elevations when the short side and the long side of the building are in the windward direction were analyzed. The separation and re-attachment of the flow were investigated by using the wind pressure distribution on the crosswind surface when the short side of the building is in the windward direction. The total body shape coefficients were calculated and compared with the data obtained from the load code. Results show that the length-to-width ratio has insignificant influence on the wind pressure distribution on the windward surface when the short side of the building is in the windward direction. The wind pressures on the leeward surface are uniformly distributed and their absolute values will decrease if length-to-width ratio increases. When the length-to-width ratio is larger than 4:1, the absolute values of negative wind pressure on the crosswind surface will change from large to small and to large again, indicating that separation, re-attachment and re-separation occur in the flow. The body shape coefficients on the windward surface will increase if the depth-to-width ratio increases and their values of different depth-to-width ratios on the leeward surface have totally the same tendency with that regulated in the load code.Keywords: high-rise building; wind tunnel test; body shape coefficient; wind pressure coefficient; rectangular section
*國家自然科學(xué)基金項目（51178425）。作者簡介：沈國輝，博士，副教授， Email:ghshen@zju.edu.cn。
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