框筒结构的层模型简化分析方法

Simple method for storey model analysis of frame-tube structures

将分析平面框架结构的D值法简化,并推广应用于框筒结构在侧向荷载作用下的内力和位移分析上。将楼层变形划分为剪切变形和弯曲变形;结构的整体剪切变形及内力直接用D值法进行分析,考虑了翼缘框架的剪切刚度的影响;结构的整体弯曲变形及内力通过假定轴向位移模式的简化方法进行分析,考虑了正剪力滞的影响,分析了影响结构位移的因素。通过与空间框架分析程序的比较表明,本文方法简单,实用,可直接进行手算,因而可供初步设计阶段使用。

The amendatory eontraflexure point method, which is used in plane frame structures under lateral loads, is simplified and generalized to analyze the forces and displacement of frame-tube structures. The storey deformations of frame-tube structures are divided into shear deformations and flexural deformations. The shear deformations and forces can be obtained by this method, in which the shear stiffness of flange panels is taken into account. The flexural deformations and forces can be calculated by a simple method of assumed distributions of axial displacements, in which positive shear lag effects is included and influencing factors of displacement are discussed. Contrasting with space-frame analysis programs, the simplicity and accuracy of the proposed method is demonstrated through the analysis of framed-tube structures. This method is a simple hand-calculation method and suitable for quick evaluations during preliminary design stage.