近似分析法在初设中有用,也可用来迅速检验电算结果的可靠性。本文提醒结构工程师在使用手册中所介绍的一些近似方法时,存在着潜在的错误,同时提出一种修正近似法,此法有一套尝试性假设。多跨多层刚架相当普遍,具有NB跨NS层、底部固定的矩形刚架是一个3×NB×NS次超静定结构。近似法要对这种结构变 Approximate analysis is useful in the initial setup and can also be used to quickly verify the reliability of the results. This paper reminds structural engineers of potential errors in the use of some of the approximate methods described in the manual, and proposes a modified approximation method, which has a set of tentative assumptions. The multi-span multi-story rigid frame is quite common, and the rectangular rigid frame with NB across the NS layer and fixed at the bottom is a 3×NB×NS statically indeterminate structure. Approximation method is to change this structure