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Détail de l'auteur
Auteur Rabinovitch, Oded
Documents disponibles écrits par cet auteur
Affiner la rechercheCohesive interface modeling of debonding failure in FRP strengthened beams / Rabinovitch, Oded in Journal of engineering mechanics, Vol. 134 N° 7 (Juillet 2008)
in Journal of engineering mechanics > Vol. 134 N° 7 (Juillet 2008) . - pp.579-588
Titre : Cohesive interface modeling of debonding failure in FRP strengthened beams Type de document : texte imprimé Auteurs : Rabinovitch, Oded, Auteur Année de publication : 2010 Article en page(s) : pp.579-588 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Composite materials Nonlinear analysis Fiber reinforced polymers Bonding Beams. Résumé : A theoretical model that incorporates the concept of the cohesive interface approach for the debonding analysis of reinforced concrete beams strengthened with externally bonded fiber reinforced polymer (FRP) strips is presented. The cohesive interface concept is adopted for modeling of the debonding process near the critical adhesive-concrete interface, whereas the adhesive layer itself is modeled as a two-dimensional elastic medium. Thus, the stress and deformation fields within the adhesive layer, the coupling between the shear and normal stresses and, especially, their influence on the tractions across the cohesive interface are taken into account. The nonlinear relations between the tractions and the displacement jumps across the cohesive interface are derived using a potential function and account for the peeling effects and for the coupling between the shear-slip and the peeling-separation laws. Numerical results that examine the capabilities of the model, provide insight into the stability characteristics of the debonding mechanism, and highlight some aspects of the debonding problem are presented. A summary and conclusions close the paper. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v134/i7/p578_s1?isAuthorized=no [article] Cohesive interface modeling of debonding failure in FRP strengthened beams [texte imprimé] / Rabinovitch, Oded, Auteur . - 2010 . - pp.579-588.
Mécanique appliquée
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 134 N° 7 (Juillet 2008) . - pp.579-588
Mots-clés : Composite materials Nonlinear analysis Fiber reinforced polymers Bonding Beams. Résumé : A theoretical model that incorporates the concept of the cohesive interface approach for the debonding analysis of reinforced concrete beams strengthened with externally bonded fiber reinforced polymer (FRP) strips is presented. The cohesive interface concept is adopted for modeling of the debonding process near the critical adhesive-concrete interface, whereas the adhesive layer itself is modeled as a two-dimensional elastic medium. Thus, the stress and deformation fields within the adhesive layer, the coupling between the shear and normal stresses and, especially, their influence on the tractions across the cohesive interface are taken into account. The nonlinear relations between the tractions and the displacement jumps across the cohesive interface are derived using a potential function and account for the peeling effects and for the coupling between the shear-slip and the peeling-separation laws. Numerical results that examine the capabilities of the model, provide insight into the stability characteristics of the debonding mechanism, and highlight some aspects of the debonding problem are presented. A summary and conclusions close the paper. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v134/i7/p578_s1?isAuthorized=no
in Journal of engineering mechanics > Vol 134 n° 7 (Juillet 2008) . - pp.578–588.
Titre : Cohesive interface modeling of debonding failure in FRP strengthened beams Type de document : texte imprimé Auteurs : Rabinovitch, Oded, Auteur Année de publication : 2013 Article en page(s) : pp.578–588. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Composite materials Nonlinear analysis Fiber reinforced polymers Bonding Beams Résumé : A theoretical model that incorporates the concept of the cohesive interface approach for the debonding analysis of reinforced concrete beams strengthened with externally bonded fiber reinforced polymer (FRP) strips is presented. The cohesive interface concept is adopted for modeling of the debonding process near the critical adhesive-concrete interface, whereas the adhesive layer itself is modeled as a two-dimensional elastic medium. Thus, the stress and deformation fields within the adhesive layer, the coupling between the shear and normal stresses and, especially, their influence on the tractions across the cohesive interface are taken into account. The nonlinear relations between the tractions and the displacement jumps across the cohesive interface are derived using a potential function and account for the peeling effects and for the coupling between the shear-slip and the peeling-separation laws. Numerical results that examine the capabilities of the model, provide insight into the stability characteristics of the debonding mechanism, and highlight some aspects of the debonding problem are presented. A summary and conclusions close the paper. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A7%2857 [...] [article] Cohesive interface modeling of debonding failure in FRP strengthened beams [texte imprimé] / Rabinovitch, Oded, Auteur . - 2013 . - pp.578–588.
Mécanique appliquée
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol 134 n° 7 (Juillet 2008) . - pp.578–588.
Mots-clés : Composite materials Nonlinear analysis Fiber reinforced polymers Bonding Beams Résumé : A theoretical model that incorporates the concept of the cohesive interface approach for the debonding analysis of reinforced concrete beams strengthened with externally bonded fiber reinforced polymer (FRP) strips is presented. The cohesive interface concept is adopted for modeling of the debonding process near the critical adhesive-concrete interface, whereas the adhesive layer itself is modeled as a two-dimensional elastic medium. Thus, the stress and deformation fields within the adhesive layer, the coupling between the shear and normal stresses and, especially, their influence on the tractions across the cohesive interface are taken into account. The nonlinear relations between the tractions and the displacement jumps across the cohesive interface are derived using a potential function and account for the peeling effects and for the coupling between the shear-slip and the peeling-separation laws. Numerical results that examine the capabilities of the model, provide insight into the stability characteristics of the debonding mechanism, and highlight some aspects of the debonding problem are presented. A summary and conclusions close the paper. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A7%2857 [...]
in Journal of engineering mechanics > Vol. 130 N°12 (Decembre 2004) . - 1436-1446 p.
Titre : Delamination Effects in Reinforced Concrete Slabs Strengthened with Circular Composite Patches Titre original : Effets de Décollement en dalles de Béton Renforcées avec les Pièces Rapportées Circulaires et Composées circulaires Type de document : texte imprimé Auteurs : Rabinovitch, Oded, Auteur ; Frostig, Yeoshua, Auteur ; Sture, Stein, Editeur scientifique Article en page(s) : 1436-1446 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Slabs Concrete Reinforced Composite materials Fracture mechanics Adhesives Galettes Concret Matières composites Mécanique de rupture Adhésifs Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The behavior of reinforced concrete slabs strengthened with fully or partially bonded (delaminated) circular patches is analytically investigated. The model derived follows the concepts of the high-order theory, and uses variational principles, equilibrium, and compatibility requirements, the constitutive equations of reinforced concrete (RC) members and composite laminates, and the fracture-mechanics concept of energy release rate. A substructuring approach, in which the localized response of the strengthened area is modeled assuming circular axis-symmetric behavior, is adopted. The investigated substructure consists of fully bonded and delaminated regions, where the delaminated faces can slip horizontally one with respect to another. A distinction is made between delaminations with contact, in which the delaminated faces accommodate vertical normal compressive stresses, and delaminations without vertical contact, in which the cracked interface is free of stresses on any kind. The field and governing equations of the fully bonded, delaminated (with or without contact), and unstrengthened regions, as well as the boundary/continuity conditions that combine these regions together, are derived. The influence of the existence of a delaminated area at the center of the slab and the effect of its size on the localized and overall behavior are investigated numerically. The elastic energy release rates associated with the growth of the delaminated area and their influence on the failure mode of the strengthened structure are also studied. The investigation reveals that the formation of a delaminated region reduces the composite action of the RC slab and the bonded patch, is involved with stress concentrations near the edge of the region, and may trigger an unstable delamination failure of the strengthened slab.
Le comportement des dalles en béton renforcées avec les pièces rapportées circulaires (déstratifiées) entièrement ou partiellement collées est analytiquement étudié. Le modèle dérivé suit les concepts de la théorie d'ordre élevé, et emploie des principes variationnels, équilibre, et les conditions de compatibilité, les équations constitutives des membres (RC) concrets renforcés et le composé déstratifie, et le concept de mécanique de rupture du taux de rejets d'énergie. Une approche secondaire-structurante, dans laquelle la réponse localisée du secteur renforcé est comportement symétrique modelé d'axe circulaire arrogant, est adoptée. La sous-structure étudiée se compose entièrement des régions collé et déstratifié , où des visages peut glisser horizontalement un en ce qui concerne des autres. Une distinction est faite entre les décollements avec le contact, dans lequel des visages déstratifiés adaptent à des efforts de compression normaux verticaux, et à des décollements sans contact vertical, dans lequel l'interface criquée est exempte d'efforts sur la sorte. Le champ et les équations régissantes entièrement déstratifié (avec ou sans contact), et défaillies des régions, comme les conditions de continuité de frontière qui combinent ces régions ensemble, sont dérivés. L'influence de l'existence d'a déstratifié le secteur au centre de la galette et l'effet de sa taille sur le comportement localisé et global sont étudiés numériquement. Les taux de rejets d'énergie élastique liés à la croissance du déstratifié le secteur et leur influence sur le mode de défaillance de la structure renforcée sont également étudiées. La recherche indique que la formation d'une région stratifiée réduit l'action composée de la galette de RC et de la pièce rapportée collée, est impliquée des concentrations d'effort près du bord de la région, et peut déclencher un échec instable de décollement de la galette renforcée.
DEWEY : 620.1 ISSN : 0733-9399 En ligne : cvoded@tx.technion.ac.il [article] Delamination Effects in Reinforced Concrete Slabs Strengthened with Circular Composite Patches = Effets de Décollement en dalles de Béton Renforcées avec les Pièces Rapportées Circulaires et Composées circulaires [texte imprimé] / Rabinovitch, Oded, Auteur ; Frostig, Yeoshua, Auteur ; Sture, Stein, Editeur scientifique . - 1436-1446 p.
Génie Mécanique
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 130 N°12 (Decembre 2004) . - 1436-1446 p.
Mots-clés : Slabs Concrete Reinforced Composite materials Fracture mechanics Adhesives Galettes Concret Matières composites Mécanique de rupture Adhésifs Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The behavior of reinforced concrete slabs strengthened with fully or partially bonded (delaminated) circular patches is analytically investigated. The model derived follows the concepts of the high-order theory, and uses variational principles, equilibrium, and compatibility requirements, the constitutive equations of reinforced concrete (RC) members and composite laminates, and the fracture-mechanics concept of energy release rate. A substructuring approach, in which the localized response of the strengthened area is modeled assuming circular axis-symmetric behavior, is adopted. The investigated substructure consists of fully bonded and delaminated regions, where the delaminated faces can slip horizontally one with respect to another. A distinction is made between delaminations with contact, in which the delaminated faces accommodate vertical normal compressive stresses, and delaminations without vertical contact, in which the cracked interface is free of stresses on any kind. The field and governing equations of the fully bonded, delaminated (with or without contact), and unstrengthened regions, as well as the boundary/continuity conditions that combine these regions together, are derived. The influence of the existence of a delaminated area at the center of the slab and the effect of its size on the localized and overall behavior are investigated numerically. The elastic energy release rates associated with the growth of the delaminated area and their influence on the failure mode of the strengthened structure are also studied. The investigation reveals that the formation of a delaminated region reduces the composite action of the RC slab and the bonded patch, is involved with stress concentrations near the edge of the region, and may trigger an unstable delamination failure of the strengthened slab.
Le comportement des dalles en béton renforcées avec les pièces rapportées circulaires (déstratifiées) entièrement ou partiellement collées est analytiquement étudié. Le modèle dérivé suit les concepts de la théorie d'ordre élevé, et emploie des principes variationnels, équilibre, et les conditions de compatibilité, les équations constitutives des membres (RC) concrets renforcés et le composé déstratifie, et le concept de mécanique de rupture du taux de rejets d'énergie. Une approche secondaire-structurante, dans laquelle la réponse localisée du secteur renforcé est comportement symétrique modelé d'axe circulaire arrogant, est adoptée. La sous-structure étudiée se compose entièrement des régions collé et déstratifié , où des visages peut glisser horizontalement un en ce qui concerne des autres. Une distinction est faite entre les décollements avec le contact, dans lequel des visages déstratifiés adaptent à des efforts de compression normaux verticaux, et à des décollements sans contact vertical, dans lequel l'interface criquée est exempte d'efforts sur la sorte. Le champ et les équations régissantes entièrement déstratifié (avec ou sans contact), et défaillies des régions, comme les conditions de continuité de frontière qui combinent ces régions ensemble, sont dérivés. L'influence de l'existence d'a déstratifié le secteur au centre de la galette et l'effet de sa taille sur le comportement localisé et global sont étudiés numériquement. Les taux de rejets d'énergie élastique liés à la croissance du déstratifié le secteur et leur influence sur le mode de défaillance de la structure renforcée sont également étudiées. La recherche indique que la formation d'une région stratifiée réduit l'action composée de la galette de RC et de la pièce rapportée collée, est impliquée des concentrations d'effort près du bord de la région, et peut déclencher un échec instable de décollement de la galette renforcée.
DEWEY : 620.1 ISSN : 0733-9399 En ligne : cvoded@tx.technion.ac.il
in Journal of engineering mechanics > Vol. 137 N° 2 (Fevrier 2011) . - pp.125-137
Titre : Free out-of-plane vibrations of masonry walls strengthened with composite materials Type de document : texte imprimé Auteurs : Ehab Hamed, Auteur ; Rabinovitch, Oded, Auteur Année de publication : 2011 Article en page(s) : pp.125-137 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Composite materials Free vibration Masonry walls Natural frequencies Strengthening Nonlinear analysis Résumé : The natural frequencies and the out-of-plane vibration modes of one-way masonry walls strengthened with composite materials are studied. Due to the inherent nonlinear behavior of the masonry wall, the dynamic characteristics depend on the level of out-of-plane load (mechanical load or forced out-of-plane deflections) and the resulting cracking, nonlinear behavior of the mortar material, and debonding of the composite system. In order to account for the nonlinearity and the accumulation of damage, a general nonlinear dynamic model of the strengthened wall is developed. The model is mathematically decomposed into a nonlinear static analysis phase, in which the static response and the corresponding residual mechanical properties are determined, and a free vibration analysis phase, in which the dynamic characteristics are determined. The governing nonlinear differential equations of the first phase, the linear differential eigenvalue problem corresponding to the second phase, and the solution strategies are derived. Two numerical examples that examine the capabilities of the model and study the dynamic properties of the strengthened wall are presented. The model is supported and verified through comparison with a step-by-step time integration analysis, and comparison with experimental results of a full-scale strengthened wall under impulse loading. The results show that the strengthening system significantly affects the natural frequencies of the wall, modifies its modes of vibration, and restrains the deterioration of the dynamic properties with the increase of load. The quantification of these effects contributes to the understanding of the performance of damaged strengthened walls under dynamic and seismic loads. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i2/p125_s1?isAuthorized=no [article] Free out-of-plane vibrations of masonry walls strengthened with composite materials [texte imprimé] / Ehab Hamed, Auteur ; Rabinovitch, Oded, Auteur . - 2011 . - pp.125-137.
Mécanique appliquée
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 137 N° 2 (Fevrier 2011) . - pp.125-137
Mots-clés : Composite materials Free vibration Masonry walls Natural frequencies Strengthening Nonlinear analysis Résumé : The natural frequencies and the out-of-plane vibration modes of one-way masonry walls strengthened with composite materials are studied. Due to the inherent nonlinear behavior of the masonry wall, the dynamic characteristics depend on the level of out-of-plane load (mechanical load or forced out-of-plane deflections) and the resulting cracking, nonlinear behavior of the mortar material, and debonding of the composite system. In order to account for the nonlinearity and the accumulation of damage, a general nonlinear dynamic model of the strengthened wall is developed. The model is mathematically decomposed into a nonlinear static analysis phase, in which the static response and the corresponding residual mechanical properties are determined, and a free vibration analysis phase, in which the dynamic characteristics are determined. The governing nonlinear differential equations of the first phase, the linear differential eigenvalue problem corresponding to the second phase, and the solution strategies are derived. Two numerical examples that examine the capabilities of the model and study the dynamic properties of the strengthened wall are presented. The model is supported and verified through comparison with a step-by-step time integration analysis, and comparison with experimental results of a full-scale strengthened wall under impulse loading. The results show that the strengthening system significantly affects the natural frequencies of the wall, modifies its modes of vibration, and restrains the deterioration of the dynamic properties with the increase of load. The quantification of these effects contributes to the understanding of the performance of damaged strengthened walls under dynamic and seismic loads. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i2/p125_s1?isAuthorized=no
in Journal of engineering mechanics > Vol. 130 N°11 (Novembre 2004) . - 1334-1345 p.
Titre : High-Order Analysis of Reinforced Concrete Slabs Strengthened with Circular Composite Laminated Patches of General Layup Titre original : Analyse d'Ordre Elevé des Dalles en Béton Renforcées avec les Pièces Circulaires Stratifiées et Composées du Général Layup Type de document : texte imprimé Auteurs : Rabinovitch, Oded, Auteur ; Frostig, Yeoshua, Auteur ; Ronald Y. S. Pak, Editeur scientifique Article en page(s) : 1334-1345 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Concrete slabs Composite materials Adhesive bonding Constitutive relations Shear strength Anisotropic plates Laminates Dalles en béton Matières composites Liaison adhésive Relations Constitutives Résistance au cisaillement Plats anistropiques Laminés Stratifiés Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : A high-order model for the analysis of reinforced concrete (RC) slabs strengthened with externally bonded composite laminated patches of a general layup is presented. The model follows the concepts of the high-order theory and it is based on variational principles, equilibrium, and compatibility requirements. The classical lamination theory is adopted for the composite patch and it yields a set of coordinate dependent constitutive relations. The governing equations form a set of partial differential equations with variable coefficients. The solution procedure adopts the Galerkin and the multiple-shooting methods in the circumferential and radial directions, respectively. The proposed model is used for the numerical study of a square RC slab strengthened with a circular cross-ply laminated patch. The results focus on the overall behavior of the slab and the localized shear and vertical normal stresses near the edge of the bonded patch. Comparison with results obtained using a simplified axisymmetric model is also presented and discussed. The study reveals that the anisotropy of the bonded patch affects the overall and the localized response of the strengthened slab. It also shows that the simplified axisymmetric analysis tends to underestimate the stresses and stress resultants, and thus may be considered unsafe.
DEWEY : 620.1 ISSN : 0733-9399 [article] High-Order Analysis of Reinforced Concrete Slabs Strengthened with Circular Composite Laminated Patches of General Layup = Analyse d'Ordre Elevé des Dalles en Béton Renforcées avec les Pièces Circulaires Stratifiées et Composées du Général Layup [texte imprimé] / Rabinovitch, Oded, Auteur ; Frostig, Yeoshua, Auteur ; Ronald Y. S. Pak, Editeur scientifique . - 1334-1345 p.
Génie Mécanique
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 130 N°11 (Novembre 2004) . - 1334-1345 p.
Mots-clés : Concrete slabs Composite materials Adhesive bonding Constitutive relations Shear strength Anisotropic plates Laminates Dalles en béton Matières composites Liaison adhésive Relations Constitutives Résistance au cisaillement Plats anistropiques Laminés Stratifiés Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : A high-order model for the analysis of reinforced concrete (RC) slabs strengthened with externally bonded composite laminated patches of a general layup is presented. The model follows the concepts of the high-order theory and it is based on variational principles, equilibrium, and compatibility requirements. The classical lamination theory is adopted for the composite patch and it yields a set of coordinate dependent constitutive relations. The governing equations form a set of partial differential equations with variable coefficients. The solution procedure adopts the Galerkin and the multiple-shooting methods in the circumferential and radial directions, respectively. The proposed model is used for the numerical study of a square RC slab strengthened with a circular cross-ply laminated patch. The results focus on the overall behavior of the slab and the localized shear and vertical normal stresses near the edge of the bonded patch. Comparison with results obtained using a simplified axisymmetric model is also presented and discussed. The study reveals that the anisotropy of the bonded patch affects the overall and the localized response of the strengthened slab. It also shows that the simplified axisymmetric analysis tends to underestimate the stresses and stress resultants, and thus may be considered unsafe.
DEWEY : 620.1 ISSN : 0733-9399
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