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本文给出平面刚架与桁架分析的一种新方法——回路法。其基本原理类似于物理学领域的隔离体法,即首先将整个结构分为若干子结构,然后通过每一子结构建立的回路方程解出基本未知量,最后求出整个结构的全部内力和位移。当应用这种方法建立求解基本未知量的方程组时,无论刚架多么复杂,一个方程只涉及到图1所示的一个回路,因之称此方法为回路法。当计算如图2所示刚架时,其过程如下: (一)将刚架剖分为单根杆件,并使相
This paper presents a new method for the analysis of plane rigid frames and trusses—loop method. The basic principle is similar to the isolator method in the field of physics, that is, the entire structure is first divided into several substructures, then the basic unknown quantity is solved by the loop equation established by each substructure, and finally the entire internal force and displacement of the entire structure are obtained. . When this method is used to create a system of equations for solving a basic unknown, no matter how complicated the frame is, an equation involves only one circuit as shown in Fig. 1, and this method is called a loop method. When calculating the rigid frame as shown in Figure 2, the process is as follows: (1) Split the rigid frame into single pieces and