A mesoscopic model for the behaviour of concrete under high confinement
Résumé
When impact loaded, concrete is submitted to high triaxial stresses. The experimental response of concrete under quasi-static triaxial compression is studied using a triaxial press capable of applying a mean pressure greater than 1GPa on cylindrical samples measuring 7 cm in diameter and 14 cm high. A numerical analysis of these previous experiments is performed herein at a mesoscopic scale. Concrete is modelled as a biphasic material consisting of a mortar (cement paste and fine aggregates) and roughly spherical aggregates (with a diameter exceeding 2 mm) whose characteristics are applied on a regular cubic finite element mesh. A damage-plasticity model is then used to model the behaviour of mortar. An identification of model parameters on mortar samples and the subsequent comparison between numerical and experimental tests will be presented for hydrostatic and triaxial compression. Copyright © 2009 John Wiley & Sons, Ltd.
Mots clés
Biphasic materials
Biphasic models
Cement paste
Cylindrical samples
Damage-plasticity models
Experimental test
Fine aggregates
Finite element meshes
High confinement
Identification of model
Mean pressures
Mesoscale model
Mesoscopic models
Mesoscopic scale
Quasi-static
Spherical aggregates
Triaxial compression
Triaxial stress
Numerical analysis
Plasmas
Plaster
Superconducting materials
Concrete aggregates
compressive strength
concrete
finite element method
mortar
numerical model
triaxial test