A granular micromechanic based model for the characterization of Ultra High Performance FiberReinforced Concrete (UHP FRC)

UHP FRC (Ultra-High Performance Fiber-Reinforced Concrete) has been in development for the past two decades and the request of this advanced material is on the rise. These materials overcome the problematic of the conventional concrete such as corrosion of the main rebars, residual strength, crack control, spalling and work-ability. The aim of this presentation is to provide a granular micromechanics based model for such a material. To do this, we report in short a continuum damage-elasto-plastic, based on granular micromechanics, model already presented in the literature in a general and academic way. Thus, we will show the flexibility of this approach by restricting the focus on the UHP FRC. Such a restriction is achieved not only by a novel expression of the dissipation energy functional but also by a proper identification of the newly introduced constitutive coefficients. Numerical simulations are achieved for three cases for which the deformation is homogeneous, i.e. compression, extension and shear.