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3D numerical model of a confined fracture tests in concrete
Montenegro, Oscar Ivan; Sfer, Domingo; López Garello, Carlos María; Carol Vilarasau, Ignacio
Universitat Politècnica de Catalunya. Departament d'Enginyeria del Terreny, Cartogràfica i Geofísica; Universitat Politècnica de Catalunya. MECMAT - Mecànica i Nanotecnologia de Materials d´Enginyeria
The paper deals with the numerical simulation of a confined fracture test in concrete. The test is part of the experimental work carried out at ETSECCPB-UPC in order to elucidate the existence of a second mode of fracture under shear and high compression, and evaluate the associated fracture energy. The specimen is a short cylinder with also cylindrical coaxial notches similar the one proposed by Luong (1990), which is introduced in a large-capacity triaxial cell, protected with membranes and subject to different levels of confining pressure prior to vertical loading. In the experiments, the main crack follows the pre-established cylindrical notch path, which is in itself a significant achievement. The load-displacement curves for various confining pressures also seem to follow the expected trend according to the underlying conceptual model. The FE model developed includes zero-thickness interface elements with fracture-based constitutive laws, which are pre-inserted along the cylindrical ligament and the potential radial crack plane. The results reproduce reasonably well the overall force-displacement curves of the test for various confinement levels, and make it possible to identify the fracture parameters including the fracture energies in modes I and IIa.
Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures de formigó
Concrete--Fracture--Mathematical models
Fracture energy
Fracture test
Zero-thickness interface elements
Formigó -- Fractures
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