Beam-particle approach to model the quasi-brittle behaviour of concrete CARPIUC Benchmark

Abstract : Discrete Elements Models (lattice models or particle models) are designed to describe discontinuous mediums. Unfortunately, their use for structural computations is still limited because of the mesh density required for such modeling. However, those discrete methods can be used as a virtual testing tool – to establish and identify the equations of a macroscopic model [1] – or as a post-treatment tool – to extract a fine description of the cracking pattern from a continuous computation [2]. Lattice models have been introduced to solve classical problems of elasticity [3] and extended to study the brittle [4] and quasi-brittle behaviour [5, 6] in tension after the development of computational simulation. One should note that these models cannot describe the fracturing process in compressive mode. Particle models have been proposed to study the behaviour of granular assemblies and thus only contact forces were needed to model the interactions between the particles [7]. A modification was proposed to model cohesive interactions and thus materials such as concrete [8]. Unfortunately, such modelling of the cohesion of granular materials generally lacks the simplicity of the lattice models and thus its computation time is much higher. The model used here combines the lattice approach and the particle approach [9, 10, 11]. This combination allows to correctly reproduce the failure pattern for compressive or tensile simulations. This beam-particle approach has also been partially validated on test cases of mixed-mode failure [11]. The confrontation with the two test cases constituting the CARPIUC Benchmark will give us further insights in the ability of our approach to capture the complex behaviour of concrete during failure. References [1] M. Vassaux, B. Richard, F. Ragueneau, A. Millard. Regularised crack behaviour effects on continuum modelling of quasi-brittle materials under cyclic loading. Engineering Fracture Mechanics, 149:18–36,2015.
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Submitted on : Friday, January 26, 2018 - 1:26:09 PM
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Cécile Oliver-Leblond. Beam-particle approach to model the quasi-brittle behaviour of concrete CARPIUC Benchmark. Fifth International Conference on Computational Modeling of Fracture and Failure of Materials and Structures (CFRAC2017), Jun 2017, Nantes, France. ⟨hal-01692498⟩

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