下限极限分析的平面等参单元算法

his paper introduced the elementary theory of lower bound limit analysis, using two-dimensional isoparametric element to discrete the regional,using the lower bound limit analysis theorems to set up the mathematical model which meet with the equilibrium condition, stress continuity conditions, stress boundary conditions and the yield conditions. It also introduced a numerical algorithm for nonlinear programming and using the Newton iteration to solve the problem, Compared with other algorithms, using isoparametric element needs fewer elements, it not only have high precision, but also have a better imitation of the structure.