【摘要】 本文通过研究不同长宽比、高宽比的矩形棱柱体在边界层风洞中典型攻角下的扭矩,提出了矩形高层建筑扭矩功率谱密度、均方根扭矩系数和Strouhal数的经验公式,并对相干函数作了一定的探讨,建立了完整的扭转动力风荷载解析模型。该模型和试验结果吻合较好,证明它是合理有效的,可在此基础上建立高层建筑扭转动力响应频域计算方法。更多还原

【Abstract】 By investigating torque on rectangular cylinders with various side ratios and aspect ratios at normal attack angle in a boundary layer wind tunnel, this paper presents empirical formula of torque spectra, RMS torque coefficients and Strouhal numbers of rectangular tall buildings, and coherence functions of torque are also studied. Thus a complete analytical model of torsional dynamic wind loads on rectangular tall buildings is established. This model is in good agreement with the experimental results obtained by wind tunnel tests, so it is reliable and applicable. A calculation method based on this model can be developed to evaluate wind-induced torsional responses of rectangular tall buildings in frequency domain.更多还原