李永贵, 李秋胜, 戴益民. 矩形截面高层建筑扭转向脉动风荷载数学模型[J]. 工程力学, 2015, 32(6): 177-182. DOI: 10.6052/j.issn.1000-4750.2013.11.1105
引用本文: 李永贵, 李秋胜, 戴益民. 矩形截面高层建筑扭转向脉动风荷载数学模型[J]. 工程力学, 2015, 32(6): 177-182. DOI: 10.6052/j.issn.1000-4750.2013.11.1105
LI Yong-gui, LI Qiu-sheng, DAI Yi-min. MATHEMATICAL MODELS FOR TORSIONAL FLUCTUATING WIND LOADS ON RECTANGULAR TALL BUILDINGS[J]. Engineering Mechanics, 2015, 32(6): 177-182. DOI: 10.6052/j.issn.1000-4750.2013.11.1105
Citation: LI Yong-gui, LI Qiu-sheng, DAI Yi-min. MATHEMATICAL MODELS FOR TORSIONAL FLUCTUATING WIND LOADS ON RECTANGULAR TALL BUILDINGS[J]. Engineering Mechanics, 2015, 32(6): 177-182. DOI: 10.6052/j.issn.1000-4750.2013.11.1105

矩形截面高层建筑扭转向脉动风荷载数学模型

MATHEMATICAL MODELS FOR TORSIONAL FLUCTUATING WIND LOADS ON RECTANGULAR TALL BUILDINGS

  • 摘要: 在边界层风洞中完成了一系列矩形截面高层建筑刚性模型的同步测压试验,研究了根方差扭矩系数和基底扭矩功率谱的基本特性。结果表明,层根方差扭矩系数沿高度呈抛物线分布,基底根方差扭矩系数随厚宽比的增大而增大。厚宽比小于1时,基底扭矩功率谱有一个明显的窄带谱峰;厚宽比大于1时,出现两个谱峰,随着厚宽比的增大,两个谱峰逐渐靠近。以厚宽比为自变量,拟合得到了根方差扭矩系数和基底扭矩功率谱的计算公式。

     

    Abstract: Detailed wind tunnel tests for a series of rectangular tall buildings were carried out. The basic characteristics of torsional fluctuating wind loads including the RMS torque coefficients and power spectral densities (PSDs) of base torque were discussed. The results show that the local RMS torque coefficients clearly demonstrate parabolic variations with the building height. The base RMS torque coefficients increase with the increase of side ratios. One obvious narrow-band peak is observed in the PSDs of base torque when the side ratio is less than 1, while two obvious peaks are found in the PSDs of base torque when the side ratio is larger than 1. The reduced frequencies corresponding to the two peaks approach to each other with the increase of side ratios. Furthermore, the formulas of the RMS torque coefficients and PSDs of base torque were also obtained by selecting the side ratio as a fitting parameter.

     

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