扭转方向非理想振型的广义气动力谱修正

Correction for Non-ideal Modes on Generalized Aerodynamic Spectrum in the Torsional Direction

在扭转方向,结合脉动风荷载的相干函数,采用数值积分的方法计算得出了非理想振型对高层建筑广义气动力谱的修正公式,并通过刚性模型测压试验证实了该公式的可靠性。以振型指数为参数,本文讨论了非理想振型对高层建筑广义气动力谱的影响:当振型指数大于0时,修正系数均小于1,即理想振型的广义气动力谱均大于非理想振型的广义气动力谱,实际振型的计算结果是偏于保守的。基于理想振型得到的广义气动力谱,采用0.5的修正系数进行修正,可应用于建筑结构荷载规范所采用的振型。

Combined with the coherence function of fluctuating wind load,the numerical formula is used to calculate the generalized aerodynamic spectrum of non-ideal modes for high-rise buildings in the torsional direction,whose reliability is confirmed by the rigid model test.At the same time,the influence of non-ideal vibration modes on the generalized aerodynamic spectrum of high-rise buildings is discussed with taking the vibration index as the parameters:when the mode index is greater than 0,the correction coefficient is less than 1,that is,the generalized aerodynamic spectrum of the ideal mode is larger than the generalized aerodynamic spectrum of non-ideal mode,and the calculation results of actual vibration modes are conservative.Based on the generalized aerodynamic spectrum of the ideal mode,it is recommended to use a correction factor of 0.5 in the vibration of theloadcode for the design of building structures.