Bongué Boma, Malika (2007) Crack modelling for the assessment of stiffness loss of reinforced concrete structures under mechanical loading. PhD thesis, ENPC p.245.
Abstract
We propose a model describing the evolution of mechanical and permeability properties of concrete under slow mechanical loading. Calling upon the theory of continua with microstructure, the kinematic of the domain is enriched by a variable characterising size and orientation of the crack field. We call upon configurational forces to deal with crack propagation and we determine the balance equations governing both strain and propagation. The geometry of the microstructure is representative of the porous media: the permeability is obtained from the resolution of Stokes equations in an elementary volume. An example has been treated: we considered simple assumptions (uniform crack field, application of linear fracture mechanics...) and we determined the behaviour of a body under tensile loading. Strain, crack propagation and stiffness loss are completely assessed. Finally the evolution of permeability is plotted : once activated, crack propagation is the main cause of water tightness loss.
| Item Type: | PhD Thesis (PhD) |
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| Thesis Supervisor: | Brocato, Maurizio |
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| Date: | 11 December 2007 |
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| Board of examiners: | Freidin, Alexander and Podio-Guidugli, Paolo and Ehrlacher, Alain and Forest, Samuel and Forestier, Alain and Truskinovsky, Lev and Brocato, Maurizio |
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| Collection (Fonds): | ENPC |
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| Institution: | ENPC |
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| Subjects: | 4. Materials Science, Mechanics and Mechanical Engineering |
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| Uncontrolled Keywords: | Micro-fissures, Microstructure, Forces configurationnelles, Perméabilité, Béton, Micro-cracks, Microstructure, Configurational forces, Permeability, Concrete |
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