MODELAGEM NUMÉRICA DO ENSAIO DE VIGA EM DUPLO BALANÇO UTILIZANDO UM MODELO PROBABILÍSTICO

Resumo

In most published studies with the objective of characterizing the concrete fracture under
tensile loads, the Double Cantilever Beam (DCB) test has been used. This test provides information
that allows to determine the critical stress intensity factor (KIC) and the critical energy release rate
(GIC) of concrete which are values that qualify the toughness of material. Therefore, in this work is
presented a numerical model of the DCB test, performed by means of the finite element method (FEM)
considering a probabilistic approach. The stochastic process is introduced in the model at the local scale
of the material by considering a random distribution of the tensile strength and the local cracking energy,
assuming that cracks are created within the concrete with different energy dissipation depending on the
spatial distribution of constituents and initial defects. The Monte Carlo method whose main idea is to
compute the results based on repeated random sampling and statistical analysis is used to statistically
validate the probabilistic numerical model.