Numerical-computational analysis of reinforced concrete structures considering the damage, fracture and failure criterion

Abstract

The experimental results of testing structures or structural parts are limited and, sometimes, difficult to interpret. Thus, the development of mathematical-numerical models is needed to complement the experimental analysis and allow the generalization of results for different structures and types of loading. This article makes two computational studies of reinforced concrete structures problems found in the literature, using the Finite Element Method. In these analyses, the concrete is simulated with the damage classical model proposed by Mazars and the steel by a bilinear elastoplastic constitutive model. Numerical results show the validity of the application of constitutive models which consider the coupling of theories with the technique of finite element discretization in the simulation of linear and two-dimensional reinforced concrete structures.

Modelagem computacional do processo de danificação do concreto em mesoescala

“…Já o comportamento constitutivo nãolinear do concreto é o resultado de processos de iniciação, acumulação, coalescência e propagação de microfissuras na estrutura interna do material. Portanto, o processo de fissuração corresponde ao mecanismo físico preponderante de degradação das propriedades mecânicas do concreto, o que promove a redução de rigidez e resistência do material [2].…”

Numerical analysis on displacements of steel-fiber-reinforced concrete beams

“…Regarding the investigation of the applicability of constitutive models for cracked concrete, there are several numerical tools which stand out, including the following: (a) Continuum Damage Mechanics (CDM) Models [3], [24]- [30]; (b) Concentrated Damage Model [31]- [36]; (c) Cracking distributed [37]- [40]; (c) Multi-scale models [41]; (d) Models based on failure or rupture criteria [28], [42]; and (e) Fracture models [28], [43]. On the other hand, the models can be called phenomenological models, which are intended to model the mechanical behaviour of materials based on dissipative processes which occur in the microscale.…”