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Size effect in split-cylinder (Brazilian) tensile tests is studied experimentally and analyzed theoretically. Tests of a very broad size range, 1:26, were conducted on cylindrical disks of a constant thickness made from concrete with... more
Size effect in split-cylinder (Brazilian) tensile tests is studied experimentally and analyzed theoretically. Tests of a very broad size range, 1:26, were conducted on cylindrical disks of a constant thickness made from concrete with aggregate of a maximum 5-mm size. The ...
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ABSTRACT En génie parasismique, la réduction de la vulnérabilité des structures existantes est un enjeux majeur. Le renforcement externe d’éléments par collage de Tissus de Fibre de Carbone (TFC) est une réponse intéressante à cette... more
ABSTRACT En génie parasismique, la réduction de la vulnérabilité des structures existantes est un enjeux majeur. Le renforcement externe d’éléments par collage de Tissus de Fibre de Carbone (TFC) est une réponse intéressante à cette problématique. Cet article présente la construction d’un modèle uniaxial de béton confiné adapté au cas des chargements monotones et cycliques. Ce modèle est fondé sur deux modèles bien connus, le premier basé sur la théorie de l’endommagement (La-Borderie) et le second basé sur une série d’études expérimentales (Eid & Paultre). Le modèle est implanté dans un code éléments finis multifibres. Une validation expérimentale de ce modèle est menée en étudiant le cas de poteaux en béton armé soumis `a un chargement cyclique de flexion composée.
In structural engineering, soil–structure interaction (SSI) is an important phenomenon that has to be taken into account. This paper presents a 3D non-linear interface element able to compute SSI based on the “macro-element” concept. The... more
In structural engineering, soil–structure interaction (SSI) is an important phenomenon that has to be taken into account. This paper presents a 3D non-linear interface element able to compute SSI based on the “macro-element” concept. The particularity of the macro-element lies in the fact that the movement of the foundation is entirely described by a system of generalised variables (forces and
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... type poutre Euler-Bernoulli (Owen et al., 1980 ; La Borderie, 1991 ; Ghavamian et al., 1998 ; Ghavamian et al., 2002) ou Timoschenko (Guedes et al., 1994 ; Dubé, 1997, Petrangeli et al ... Néanmoins et ceci pour... more
... type poutre Euler-Bernoulli (Owen et al., 1980 ; La Borderie, 1991 ; Ghavamian et al., 1998 ; Ghavamian et al., 2002) ou Timoschenko (Guedes et al., 1994 ; Dubé, 1997, Petrangeli et al ... Néanmoins et ceci pour l'ensemble des niveaux les résultats en Y ne sont pas si satisfaisants ...
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This paper deals with the application of continuum damage mechanics to the description of the response of reinforced concrete members. Two simplifying assumptions are made:(1) The constitutive law of concrete is the isotropic damage law;... more
This paper deals with the application of continuum damage mechanics to the description of the response of reinforced concrete members. Two simplifying assumptions are made:(1) The constitutive law of concrete is the isotropic damage law; and (2) there are no ...
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This paper presents a review of the different models for concrete based on continuum damage theory, formulated at the Laboratoire de Mécanique et Technologie (Cachan, France). Derived in the framework of the thermodynamics of irreversible... more
This paper presents a review of the different models for concrete based on continuum damage theory, formulated at the Laboratoire de Mécanique et Technologie (Cachan, France). Derived in the framework of the thermodynamics of irreversible processes, each formulation is ...
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This paper presents a macro-element to simulate dynamic Soil-Structure Interaction (SSI). This new numerical tool is suitable for dynamic (seismic) loadings on structures with shallow foundations. It takes into account the plasticity of... more
This paper presents a macro-element to simulate dynamic Soil-Structure Interaction (SSI). This new numerical tool is suitable for dynamic (seismic) loadings on structures with shallow foundations. It takes into account the plasticity of the soil, the uplift of the foundation, P–θ effects and the radiation damping. The foundation is supposed infinitely rigid while its movement is entirely described by a
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According to the French code PS92 lightly reinforced concrete walls subjected to earthquake ground motion are designed following the “multifuse” concept. Low percentages of reinforcement combined with an appropriate distribution at... more
According to the French code PS92 lightly reinforced concrete walls subjected to earthquake ground motion are designed following the “multifuse” concept. Low percentages of reinforcement combined with an appropriate distribution at several levels lead to dissipation of energy via wide crack patterns at different heights of the wall. On the contrary, design according to Eurocode 8 (EC8) privileges dissipation at
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... 2. Multifibers beam elements for nonlinear transient analysis of reinforced concrete structures. ... With respect to the large spreading of the zone with nonlinear behavior we further seek to ... 1). The main advantage of using a... more
... 2. Multifibers beam elements for nonlinear transient analysis of reinforced concrete structures. ... With respect to the large spreading of the zone with nonlinear behavior we further seek to ... 1). The main advantage of using a multifiber type finite element concerns the simple uniaxial ...
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... 1). Quant aux contraintes gtntralistes cintmatiquement admissibles, elles peuvent Stre calcultes en tout point de I'tltment grice ii la fonction de forme et 6 la relation de comportement en effectuant une inttgration sur... more
... 1). Quant aux contraintes gtntralistes cintmatiquement admissibles, elles peuvent Stre calcultes en tout point de I'tltment grice ii la fonction de forme et 6 la relation de comportement en effectuant une inttgration sur la section de la poutre composte de couches superpostes. ...
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... failure of the structure; and (3) a consistent model for the steel-concrete interface. The first item has been extensively studied over the past years and many models for concrete are available, eg fracturing strain models [1],... more
... failure of the structure; and (3) a consistent model for the steel-concrete interface. The first item has been extensively studied over the past years and many models for concrete are available, eg fracturing strain models [1], continuous damage theories [2], or microplane models [3 ...
In mountainous areas where the falling rocky blocks constitute a major hazard to civil structures, the structural systems to protect roads and vehicles are usually rock sheds composed of over pretensioned reinforced concrete elements.... more
In mountainous areas where the falling rocky blocks constitute a major hazard to civil structures, the structural systems to protect roads and vehicles are usually rock sheds composed of over pretensioned reinforced concrete elements. This is mainly due to the lack of knowledge of the dynamic effects caused by these falling rocks. A thick backfilling layer that prevents the direct impact of falling rocks by constituting a damping medium commonly covers the roof slab of protection structures. This allows the design of the slab with static ...