Nonlinear analysis of inelastic frames considering a corotational approach and plasticity by layers: a discussion about computational implementation

Resumo

This work presents the development of a numerical solver for nonlinear analyses of plane frame

structures using the corotational formulation to take into account geometric nonlinearity and considering an elasto-
plastic constitutive model. A one-dimensional rate-independent plastic model with isotropic hardening was

implemented, and the cross-sections of beam-column elements were subdivided into layers to simulate
plastification. The goal is to discuss the computational implementation aspects of the inelastic material behavior
in an object-oriented framework for nonlinear finite element analysis of frame structural models. A numerical
example is presented to highlight the influence of the inelastic behavior in the equilibrium path of structures.