国家体育场屋盖结构风振响应的时域分析
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摘要
以国家体育场大跨屋盖结构风振响应的计算分析为研究对象,提出了在时域内计算振型能量参与系数的方法,并采用振型能量累积参与系数选择主导振型;提出了利用主导振型响应的协方差计算结构节点的方差响应以及峰值因子的方法。计算结果表明,基于振型时程积分法的风振响应计算方法及响应统计分析方法既显著提高了计算效率又保证了计算结果的精度。
The mode energy participation coefficient in time domain is presented in this paper. The dominant modes of Beijing National Stadium (abbr. BJNS) are identified by the energy participation coefficients and the cumulative coefficients. Then the wind-induced responses of the dominant modes of BJNS are analyzed by time history analysis method. The covariance matrix of dynamic responses for the dominant modes is calculated, and then the displacement variances and peak factors of the structural nodes are determined. The mode-based time history analysis method presented in this paper improves the calculation efficiency and guarantees the precision of the calculated results.
The mode energy participation coefficient in time domain is presented in this paper. The dominant modes of Beijing National Stadium (abbr. BJNS) are identified by the energy participation coefficients and the cumulative coefficients. Then the wind-induced responses of the dominant modes of BJNS are analyzed by time history analysis method. The covariance matrix of dynamic responses for the dominant modes is calculated, and then the displacement variances and peak factors of the structural nodes are determined. The mode-based time history analysis method presented in this paper improves the calculation efficiency and guarantees the precision of the calculated results.
引文
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[2]Wu Y,Zhang J S,Chen B,Shen S Z.Identification of the dominant vibration modes of single-layer reticulated shells under wind action[J].International Journal of Space Structures,2007,22(2):123―132.
[3]田玉基,杨庆山.国家体育场大跨度屋盖结构风振系数研究[J].建筑结构学报,2007,28(2):26―31.Tian Yuji,Yang Qingshan.Gust factors for large-span roofof the National Stadium[J].Journal of Building Structures,2007,28(2):26―31.(in Chinese)
[4]Gu M,Xu Y L,Chen L Z,Xiang H F.Fatigue life estimation of steel girder of Yangpu cable-stayed Bridge due to buffeting[J].Journal of Wind Engineering and Industrial Aerodynamics,1999,80:383―400.
[5]Minh N N,Miyata T,Yamada H,Sanada Y.Numerical simulation of wind turbulence and buffeting analysis of long-span bridges[J].Journal of Wind Engineering and Industrial Aerodynamics,1999,83:301―315.
[6]郭勇,孙炳楠,叶尹.大跨越输电塔线体系风振响应的时域分析[J].土木工程学报,2006,39(12):12―17.Guo Yong,Sun Bingnan,Ye Yin.Time-domain analysis on wind-induced dynamic response of long span power transmission line systems[J].China Civil Engineering Journal,2006,39(12):12―17.(in Chinese)
[7]Uematsu Y,Kuribara O,Yamada M,Sasaki A,Hongo T.Wind-induced dynamic behavior and its load estimation of a single-layer latticed dome with a long span[J].Journal of Wind Engineering and Industrial Aerodynamics,2001,89:1671―1687.
[8]李永乐,廖海黎,强士中.考虑桥塔风效应的斜拉桥时域抖振分析[J].空气动力学学报,2005,23(2):228―233.Li Yongle,Liao Haili,Qiaqng Shizhong.Efect of pylon stochastic wind field on buffeting response of long cable-stayed bridge[J].ACTA Aerodynamica SINICA,2005,23(2):228―233.(in Chinese)
[9]潘峰,孙炳楠,楼文娟.大跨开孔结构屋盖风致响应分析的多模态精细时程分析法[J].浙江大学学报(工学版),2007,41(6):1000―1006.Pan Feng,Sun Bingnan,Lou Wenjuan.Analysis on wind-induced dynamic response for long-span roof of opening structure by multi-modal precise time-integration method[J].Journal of Zhejiang University(Engineering Science),2007,41(6):1000―1006.(in Chinese)
[10]Bathe K J.Finite element procedures in engineering analysis[M].Prentice-Hall,Inc.,New Jersey,1996.
[11]田玉基,杨庆山.地震地面运动作用下结构反应的分析模型[J].工程力学,2005,22(6):170―174.Tian Yuji,Yang Qingshan.Analysis models and methods for structural seismic responses[J].Engineering Mechanics,2005,22(6):170―174.(in Chinese)
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