某景觀煙囪順風(fēng)向風(fēng)振響應(yīng)分析與風(fēng)振系數(shù)確定
張文元1，鄭朝榮1，張耀春1，武岳1，孫雨宋2
- 摘 要
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（1 哈爾濱工業(yè)大學(xué)土木工程學(xué)院，哈爾濱 150090； 2 東北電力設(shè)計院，長春 130021)［摘要］采用SAP2000軟件建立了某景觀煙囪的結(jié)構(gòu)分析模型，輸入風(fēng)荷載時程進(jìn)行風(fēng)振響應(yīng)分析?？紤]了煙囪復(fù)雜外形和不規(guī)則質(zhì)量分布，利用頻域方法計算了煙囪第1階振型的風(fēng)振位移響應(yīng)，并與時域方法的結(jié)果進(jìn)行對比，二者吻合較好。分別采用陣風(fēng)荷載因子法和慣性風(fēng)荷載法計算了煙囪結(jié)構(gòu)不同高度處的風(fēng)振系數(shù)，并將基于該兩種風(fēng)振系數(shù)的等效靜力風(fēng)荷載分別作用在煙囪結(jié)構(gòu)上，計算其順風(fēng)向位移響應(yīng)并與精確值進(jìn)行比較，結(jié)果表明其位移分布均符合真實響應(yīng)。因此雖然上述兩種方法得到的風(fēng)振系數(shù)沿高度分布差別較大，但均能實現(xiàn)煙囪的風(fēng)振位移等效，均是合理的。為工程應(yīng)用方便，采用基于陣風(fēng)荷載因子法的風(fēng)振系數(shù)供結(jié)構(gòu)設(shè)計使用。［關(guān)鍵詞］風(fēng)振系數(shù)；煙囪；時域；頻域；陣風(fēng)荷載因子法；慣性風(fēng)荷載法Analysis on along-wind-induced responses and determination of gust response factor on a landscape chimneyZhang Wenyuan1, Zheng Chaorong1, Zhang Yaochun1, Wu Yue1, Sun Yusong2(1 School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;2 Northeast Electric Power Design Institute, Changchun 130021, China)Abstract:Based on the finite element model of a landscape chimney by SAP2000 and wind load history, the dynamic responses of the chimney were analyzed using time domain method. Also, wind-induced displacements of chimney’s first mode were calculated using the frequency domain method, in which the uneven distribution of width and mass was taken into account, and the results are close to the responses from time domain analysis. Both the gust loading factor method and the inertial wind load method were selected to calculate the gust response factors along the height of chimney, and distribution of wind-induced displacements by the equivalent static wind loads based on the above methods agrees well with the exact displacements. So the two methods can both acquire reasonable gust response factors and realize the displacements equivalence of chimney, though distributions of the gust response factors have great difference. Lastly, the gust response factors calculated from the gust loading factor method are recommended for reference of practical design, as for convenience of application.Keywords:gust response factor; chimney; time domain; frequency domain; gust loading factor; inertial wind load作者簡介：張文元，博士，副教授，Email：hitzwy@163.com。參考文獻(xiàn)［1］GB50009—2001建筑結(jié)構(gòu)荷載規(guī)范［S］. 北京: 中國建筑工業(yè)出版社, 2002.［2］GBJ135—90高聳結(jié)構(gòu)設(shè)計規(guī)范［S］. 北京: 中國建筑工業(yè)出版社, 1990.［3］鄭朝榮, 張文元, 張耀春, 等. 某發(fā)電廠景觀煙囪的風(fēng)載體型系數(shù)研究［J］. 工業(yè)建筑, 2008，38（S1）：259-263.［4］AHSOM KAREEM. Dynamic response of high-rise building to stochastic wind loads［J］. J. Wind Engineering and Industial Aerodynamics, 1992, 41-44: 1101-1112.［5］TSUKAGOSHI H,et al. Response analysis of along-wind and across-wind vibrations of tall buildings in time domain［J］. J. Wind Engineering and Industrial Aerodynamics, 1993, 46-47: 497-506.［6］陳波. 張拉膜結(jié)構(gòu)風(fēng)振響應(yīng)分析［D］. 哈爾濱: 哈爾濱工業(yè)大學(xué), 2003.［7］黃本才.結(jié)構(gòu)抗風(fēng)分析原理及應(yīng)用［M］. 上海：同濟(jì)大學(xué)出版社，2001.［8］埃米爾·?？? 羅伯特·H·斯坎倫著. 風(fēng)對結(jié)構(gòu)的作用——風(fēng)工程導(dǎo)論［M］. 劉尚培, 項海帆, 謝霽明, 譯. 上海：同濟(jì)大學(xué)出版社，1992.［9］DAVENPORT A G. Gust loading factors ［J］. Journal of the Structural Division, 1967, 93(ST3): 11-34.［10］ZHANG X T. The current Chinese code on wind loading and comparative study of wind loading codes ［J］. Journal of Wind Engineering and Industrial Aerodynamics, 1988, 30: 133-142.
