【摘要】 本文用变位法导得了等截面门式刚架的弹性稳定临界状态方程，通过计算分析，讨论了影响 计算长度的各种因素。并进行了有机玻璃模型的实验验证。 对于钢门式刚架，可不考虑由于非节点荷载作用在梁中产生的轴力，刚架梁仅按受弯构件计 算，刚架柱采用柱顶节点载荷作用时的长度系数值。更多还原

【Abstract】 By the theory of displacement, the elastic stability of portal frames is analysed and an equation with critical state is derived. In the design work, for a steel portal frame carrying different kind of loads the beam is conside- red just as a bending member by neglecting its axial force without appreciable error. The various factors affecting the effective length of the column are stu- died analytically. In the case of steel portal frame, the same effective length for a top axial loaded column can also be used for designing purpose. The results of analyses are checked and verified by laboratory experime- nts in the form of model tests with pyrexiglass.更多还原