钢框架计算的CDC法

Ultimate Load Carrying Capacity of Planar Steel Frames by Column Deflection Curve Method

本文以文[4]导出的单个梁-柱的增量相关方程为基础,讨论了CDC法在钢框架分析中的计算原理。即在框架计算中,以各梁-柱为独立单元,根据各单元自身的边界条件和相互的变形连续条件,建立整个结构的内力增量与变形增量的相关方程,从而定出荷载作用下结构的变形状态,再由外力增量与变形增量的相关方程反算荷载增量的合理取值,从而使框架计算的全过程得到大幅度的简化。因此,框架计算的CDC法是解决其计算精度和速度的有效途径。

This paper is intended to study a computation philosophy in the analysis of planar steel frames by CDC (Column Deflection Curve) method and increment interaction equations of beam-column (Ref. 4). As for the frame analysis, each beam-column is taken as an isolated member. According to boundary conditions of each member and compatibility deformation conditions of joint membeis, interaction equations of external load increment and deformation increment of a global structure are established. As a result, frame deflection configuration is determined. Finally, the rational value of load increment with interaction equations of external load increment and deformation increment is calculated. The whole analysis of structures can be substantially simplified. Therefore, the CDC method which calculates frames is an effective approach to the contradiction of calculating accuracy and speed.