关键词: 中性平衡法, 稳定方程, 铰接, 门式刚架, 计算长度系数

Abstract: Five gabled frames with hinges are analyzed by the equilibrium method and the effective length factors of coulumns are determined by solving stability equations, theoretical analysis and codes for design or technical specifications. The calculation results show that the results of the equilibrium method and the finite element method are consistent; the effective length factors of leaning columns are equla to one by codes for design or technical specifications, but greater than one by the equilibrium method; for frame columns, the calculation results of codes for design or technical specifications are different from those obtained by equilibrium method. It is shown that the code method is not suitable to analyze the frame stability, the effective length factors of the frame columns should be obtained by the second order analysis.

Key words: Equilibrium method, stability equation, hinge, gabled frames, effective length factor