本文讨论了Neal & Symonds求框架破坏机构的原则,提出了一种计算机程序,可以从大量可能的组合机构中求得真正的破坏机构,从而很快地确定极限荷载。本文所提方法不仅使Neal & Symonds原则得到实际应用途径,而且节省了大量繁琐的计算过程。文中首先用手算例题对此法加以分析说明,随之用编制的计算机程序RFMC自动地进行机构组合并求得极限荷载。文中还通过解算两层框架的极限荷载,说明此法同样可应用于分析多层框架。 This paper discusses the principles of Neal & Symonds’s frame breaking mechanism and proposes a computer program that can determine the true damage mechanism from a large number of possible combinations and quickly determine the ultimate load. The method proposed in this paper not only makes the Neal & Symonds principle practical, but also saves a lot of tedious calculations. In this paper, the method is firstly analyzed by hand. Then the computer program RFMC is used to automatically combine the mechanisms and find the ultimate load. The paper also solves the ultimate load of the two-layer frame, indicating that this method can also be applied to the analysis of multi-layer frames.