本文基于计算结构力学概念提出了刚架结构连续变更定理,用数值分析与递推公式相结合的方法连续生成结构极限状态函数,给出了结构退化为机构的新判据。由于引用了计算结构力学方法,重分析不必重新形成结构刚度阵,不必反复求逆矩阵,大大提高了计算效率。 Based on the concept of computational structural mechanics, this paper proposes the continuous change theorem of rigid frame structure. The method of numerical analysis combined with recursive formulae is used to generate the structural limit state function continuously. The new criteria for structure degradation are given. Because of the reference to the computational structural mechanics method, reanalysis does not have to re-form the structural stiffness matrix and it is not necessary to repeatedly invert the matrix, which greatly improves the computational efficiency.