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分析刚架稳定性能时,常把横梁上的荷载集中于柱顶,这对单层无侧移刚架可能产生较大误差。为推导出合乎刚架实际性能的实用设计方法,首先进行刚架的弹性稳定分析,明确失稳是渐近极值型的。由于失稳时变形过大,不应用其临界荷载来确定柱的计算长度。其次对刚架水平推力是否需要二阶分析进行探讨,结论是否定的。再次,对弱梁刚架和弱柱刚架两种典型情况进行分析,明确设计规范采用的传统设计方法可以用于这类刚架设计,只是必须考虑水平推力的影响。文中强调了把无侧移刚架分为弱梁刚架和弱柱刚架的必要性,给出刚架类型的判别式和弱梁刚架的易位计算法。
When analyzing the stability of the frame, the load on the beam is often concentrated on the top of the column, which may cause a large error on the single-layer non-side-shifted frame. In order to derive the practical design method which is in line with the actual performance of rigid frame, firstly, the elastic stability analysis of rigid frame is made and it is clear that the instability is asymptotic extreme type. Due to the large deformation during destabilization, the critical load should not be used to determine the calculated length of the column. Secondly, whether the horizontal thrust of rigid frame needs second-order analysis is discussed, the conclusion is negative. Thirdly, we analyze two typical cases of weak frame and weak column frame, and make it clear that the traditional design method adopted by the design code can be applied to such rigid frame design, only the influence of horizontal thrust must be considered. The paper emphasizes the necessity of dividing the non-side-shifting rigid frame into weak beam rigid frame and weak column rigid frame, and gives the discriminant of rigid frame type and the translocation method of weak frame.