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Modélisation des effets unilatéraux basés sur l'ouverture de fissures
Numerical modeling of cracking is of a great importance when considering safety and durability of concrete structures. Generally, classical formulations are used to describe damage and inelasticty due to micro-cracks opening. For cyclic loadings, or when a stress redistribution appears in a structures, the material recovres its original elasticity du to micro-cracks closing. The description of this phenomenon is based generally on a strain or a stress decomposition. Models developed so are mostly instables or not thermodynamically corrects. The model developed (Matallah et al., 2006) proposes an original approach where an internal variable called the Unitary Crack Opening ϵou f is introduced to allow crack opening computation. The unilateral effect (Crack closure effect) is naturally introduced thanks to the variable ϵou f. We will start this paper by formulating the model. Furthermore, numerical model responses of beam subjected to cyclic loading are presented. Crack patterns at different loading levels are presented in order to demonstrate the capacity of the model (throug the variable ϵou f) to represent crack opening and crack closure effect.
Modélisation des effets unilatéraux basés sur l'ouverture de fissures
Numerical modeling of cracking is of a great importance when considering safety and durability of concrete structures. Generally, classical formulations are used to describe damage and inelasticty due to micro-cracks opening. For cyclic loadings, or when a stress redistribution appears in a structures, the material recovres its original elasticity du to micro-cracks closing. The description of this phenomenon is based generally on a strain or a stress decomposition. Models developed so are mostly instables or not thermodynamically corrects. The model developed (Matallah et al., 2006) proposes an original approach where an internal variable called the Unitary Crack Opening ϵou f is introduced to allow crack opening computation. The unilateral effect (Crack closure effect) is naturally introduced thanks to the variable ϵou f. We will start this paper by formulating the model. Furthermore, numerical model responses of beam subjected to cyclic loading are presented. Crack patterns at different loading levels are presented in order to demonstrate the capacity of the model (throug the variable ϵou f) to represent crack opening and crack closure effect.
Modélisation des effets unilatéraux basés sur l'ouverture de fissures
Matallah, Mohammed (author) / La Borderie, Christian (author)
European Journal of Environmental and Civil Engineering ; 12 ; 1105-1122
2008-11-01
18 pages
Article (Journal)
Electronic Resource
Unknown
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