Inverse analysis of constitutive models applied to steel fiber reinforced concrete

Resumo

Steel fiber reinforced concrete (SFRC) structures are increasingly being inserted in engineering, mainly
due to the good properties of the material to the tensile stresses. To represent the behavior of these structures, there
are several constitutive models in the literature, in which the stress x strain diagram of the material is derived from
laboratory tests, such as the flexural test EN 14651. The simplicity of obtaining the stress x strain diagram of these
constitutive models is one of its main advantages, however, they do not always represent the real behavior of the
material. In this paper, the modeling strategies developed to simulate the EN 14651 three point bending test are
presented, where the constitutive models of 2010 fib Model Code (MC 2010) and 2008 Instrucction de hormigón
structural (EHE 08) are inserted. Through a quasi - static analysis of the Abaqus software, the divergences and
similarities between the two models and existents experimental results are discussed. An adaptation of the stress
x strain diagram is suggested through an inverse analysis, where it was possible to perceive that the complex
mechanical behavior of the SFRC needs adjustments to be better represented.