The article presents the approbation of the previously proposed algorithm for calculating flat rod systems whose cross sections have one axis of symmetry and the material is physically nonlinear. The diagram of the relationship between stresses and strains corresponds to an ideal elastoplastic material or an elastoplastic material with hardening. The calculation algorithm is based on the developed finite element of the mixed method. Examples of calculating statically determinable rod systems are given.

Keywords: finite element of the mixed method, elastoplastic material, physical nonlinearity