Concrete is an heterogeneous structural material whose constitutive behaviouris strictly depending on the mechanical properties of the aggregates and themortar. Its behaviour is often macroscopically characterised by assigning homogenisedmechanical properties. A number of methods are devoted to theprediction of the mechanical properties of the composite material by meansof meso-scale analysis. The paper concerns a new meso-scale model of cementitiousmaterials. The numerical description of the meso-scale structureis attained using a random method that allocates at each Gauss point of thefinite element discretization of the Representative Volume Element a specificphase of the mixture: aggregate, mortar, void. Each phase is characterisedby a specific constitutive model. The method is tested with numerical simulationsof cyclic uniaxial compression tests and of multiaxial compression tests,the latter leading to the generation of a biaxial strength domain, for differentvalue of the confinement pressure, that is found to be in good agreement withconcrete experimental domains.
|Titolo:||Meso-scale simulation of concrete multiaxial behavior|
|Data di pubblicazione:||2017|
|Appare nelle tipologie:||1.1 Articolo in rivista|