Review article

The paper considers a discrete-analytical solution of the plane strength problem, with the rod system being under elastic-plastic loading, and the rod performance is considered fundamentally important for the study. Simplifications are proposed in determining the plastic stiffness matrix of the rod element using the integral function of the law of the section state. A mathematical model has been developed to determine the tangential stiffness of a cross-section of the rod of a variable form at a time step, during elastic-plastic camputation. The results of a physically nonlinear calculation of the planar system with the articulation of a large number of rod macro-elements are presented.