- 摘 要
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（北京交通大學(xué)土木建筑工程學(xué)院， 北京 100044）
［摘要］對5個小矢跨比球形屋面進行了剛性模型測壓風(fēng)洞試驗，研究其平均風(fēng)壓系數(shù)和風(fēng)壓極值分布，并與中國、日本和美國規(guī)范進行了對比。試驗結(jié)果表明：矢跨比對球形屋面平均風(fēng)壓系數(shù)的分布影響顯著，當矢跨比較大時，迎風(fēng)區(qū)出現(xiàn)正壓，最大負壓出現(xiàn)在屋面頂部；而當矢跨比較小時，整個屋面均為負壓，最大負壓分別出現(xiàn)在屋面迎風(fēng)前緣和屋面頂部，且常常前者幅值大于后者。各國規(guī)范與風(fēng)洞試驗的對比結(jié)果表明：對于屋面大部分區(qū)域，中國規(guī)范的規(guī)定值總體偏于保守，對小矢跨比球形屋面的迎風(fēng)區(qū)域負壓值估計不足；球形屋面出現(xiàn)較大的負壓極值風(fēng)壓系數(shù)，極值風(fēng)壓系數(shù)在屋面的大部分中間區(qū)域的變化梯度小，而在屋面邊緣位置的變化梯度大?；陲L(fēng)洞試驗結(jié)果,給出了屋面分區(qū)平均風(fēng)壓系數(shù)和極值風(fēng)壓系數(shù)建議值。
［關(guān)鍵詞］球形屋面; 風(fēng)洞試驗; 矢跨比; 平均風(fēng)壓系數(shù); 極值風(fēng)壓系數(shù)
中圖分類號：TU312.1 文獻標識碼：A 文章編號：1002-848X(2014)10-0073-06
Research on wind tunnel tests of wind pressure coefficients on dome roofs
Chen Bo, Zhou Jing, Zhong Pengpeng, Yang Qingshan
(School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)
Abstract: Mean and peak wind pressure coefficients on dome roofs with five different rise-span ratios were investigated with wind tunnel tests, and the experiment results were compared to those in Chinese, Japanese and American building codes. Test results show that the rise-span ratio has important effects on the distribution of mean wind pressure coefficients. Positive pressure occurs on the windward roof area, and the maximum suction occurs on the roof apex for the roof with a big rise-span ratio. Suction occurs on the whole roof, the big suction occurs on the windward and the roof apex for the roof with a small rise-span ratio, and the suction amplitude on the windward edge is usually larger than the value on the roof apex. Results obtained by comparing Chinese, Japanese and American building codes with wind tunnel tests show that mean wind pressure coefficients on the most of the roof are conservative in Chinese building code, but it underestimates the values on the windward edge roof area. Large peak suction occurs on dome roofs, and the values of peak wind pressure coefficients in the most of inner roof area are similar, but those on the edge area change greatly. The mean and peak wind pressure coefficients are proposed for different roof zones on the basis of the experiment results.
Keywords: dome roof; wind tunnel test; rise-span ratio; mean wind pressure coefficient; peak wind pressure coefficient
*國家自然科學(xué)基金(91215302,51378059)，中央高?；究蒲袠I(yè)務(wù)費專項資金(2010JBZ011)。
作者簡介：陳波，博士，副教授，Email: chenbohrb@163.com。
參考文獻
［1］TAYLOR T J. Wind pressures on a hemispherical dome［J］. Journal of Wind Engineering and Industrial Aerodynamics, 1992, 40(2): 199-213.
［2］SUN YING, WU YUE, SHEN SHI ZHAO. The nongaussian features of wind pressure on large-span roofs［C］//IASS-APCS 2006. Beijing, 2006:354-355.
［3］LETCHFORD C W, SARKAR P P. Mean and fluctuating wind loads on rough and smooth parabolic domes［J］. Journal of Wind Engineering and Industrial Aerodynamics, 2000, 88(1):101-117.
［4］李元齊, 沈祖炎. 球面殼體表面風(fēng)壓分布特性風(fēng)洞試驗研究［J］. 建筑結(jié)構(gòu)學(xué)報, 2005, 26(5):104-111.
［5］周驥, 李元齊, 張其林. 球殼三維定常風(fēng)場數(shù)值模擬［J］. 建筑結(jié)構(gòu), 2008, 38(10):87-89.
［6］CHENG C M, FU C L. Characteristic of wind loads on a hemispherical dome in smooth flow and turbulent boundary layer flow［J］. Journal of Wind Engineering and Industrial Aerodynamics, 2010, 98(6): 328-344.
［7］GB 50009—2012建筑結(jié)構(gòu)荷載規(guī)范［S］. 北京.中國建筑工業(yè)出版社, 2012.
［8］AIJ-2004 AIJ recommendations for loads on building［S］. 2004.
［9］ASCE 7-10 Minimum design loads for buildings and other structures［S］. American Society of Civil Engineers, 2010.
［10］全涌, 顧明, 陳斌. 非高斯風(fēng)壓的極值計算方法［J］.力學(xué)學(xué)報, 20-10, 42(3):560-566.
［11］YOSHIDA A，TAMURA Y，KURITA T. Effects of bends in a tubing system for pressure measurement［J］. Journal of Wind Engineering and Industrial Aerodynamics, 2001,89(14-15):1701-1716.
