Simulación de la rotura del hormigón reforzado con fibras en un código libre de elementos finitos (OOFEM)

Abstract

The use of fibre-reinforced concrete (FRC) has experienced a big impulse in recent years. The increasing interest in FRC has produced a remarkable number of experimental studies that identify how diverse aspects of their production affect their properties, both in fresh state and hardened. Together with these experimental studies, several approaches have been proposed for numerically reproducing fracture in FRC. Of these approaches, it is worth mentioning the use of cohesive fracture by using a trilinear softening function, which has proven to be efficient and relatively simple. In this study, a material model is proposed for reproducing the fracture behaviour of FRC. Differently from previous models, developed for the commercial code ABAQUS, this model is developed in OOFEM, a free finite element code developed at the Czech Technical University in Prague (Czech Republic) and Chalmers University of Technology (Sweden), thus providing the general public with a tool that allows reproducing fracture in structural elements made with fibre-reinforced concrete elements. From the mathematical point of view, this model reproduces the mechanical behaviour of FRC by means of a damage parameter that ranges between 0 and 1, providing results that are very similar to those obtained with the embedded crack model on which it is based.