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传统的计算长度系数法计算框架稳定时不能考虑同层柱之间的支援作用以及层与层之间的支援作用,有可能会造成不合理的设计。利用等效负刚度的概念,定义了可用于表征层刚度富余程度的层刚轴比系数以及表征层间支援程度的层支援系数,通过层刚轴比系数可以方便的确定框架的薄弱层以及各层之间的相互支援关系,推导了可直接计算有侧移框架整体弹性稳定承载力的简单实用的计算公式。该公式可很好的考虑同层柱之间的支援作用以及层与层之间的支援作用,避免了有限元屈曲分析。通过弹性稳定承载力可进一步反算柱的计算长度系数用于构件校核。算例计算结果表明:该方法具有很好的精度和准确性,计算结果稍偏安全,可供工程设计及理论计算使用。
The traditional calculation of length factor method can not consider the support function of the same layer and the supporting function between layers in the calculation of stable framework, which may cause unreasonable design. The concept of equivalent negative stiffness is used to define the layer stiffness coefficient that can be used to characterize the degree of stiffness of layer stiffness and the layer support coefficient to characterize the degree of interlayer support. The layer stiffness coefficient of the layer can be easily determined, Layer and the mutual support relationship between them, a simple and practical formula for directly calculating the overall elastic and stable bearing capacity of a side-sway frame is derived. The formula can well consider the support function between layers of pillars and the support function between layers, avoiding the finite element buckling analysis. The calculated length coefficient of the column can be further used to check the component by the elastic stable bearing capacity. The calculation results of the example show that the method has good accuracy and accuracy, and the calculation result is somewhat safe, which can be used in engineering design and theoretical calculation.