# Inverse analysis of constitutive models applied to steel fiber reinforced concrete

## Palavras-chave:

Steel Fiber Reinforced Concrete, constitutive models, mechanical behavior## 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.