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Localized effects in walls strengthened with externally bonded composite materials / Dvir Elmalich in Journal of engineering mechanics, Vol. 138 N° 9 (Septembre 2012) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 138 N° 9 (Septembre 2012) . - pp.1112–1126. Titre : Localized effects in walls strengthened with externally bonded composite materials Type de document : texte imprimé Auteurs : Dvir Elmalich, Auteur ; Rabinovitch, Oded, Auteur Année de publication : 2012 Article en page(s) : pp.1112–1126. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Composite  materials  Finite-element  method  Masonry  Numerical  analysis  Stress  analysis  Structural  analysis  Stress  concentration Résumé : The localized effects and, particularly, the stress and deformation concentrations near edges, mortar joints, and irregular points in walls strengthened with externally bonded composite materials are studied. To quantify the structural behavior and to cope with the coupling of large-scale and localized-scale effects, a substructuring procedure that uses a specially tailored high-order finite element is developed. The specially tailored element accounts for the bidirectional behavior of the wall and for the interfacial interaction between the adhesively bonded components. The formulation uses a first-order shear deformation orthotropic plate theory for the independent modeling of the existing wall and the composite layers and a high-order theory for the modeling of the displacement fields of the adhesive layers. A static condensation-based substructuring procedure is used for the formulation of a superelement. The computational strength and the convergence characteristics of the high-order superelement formulation are demonstrated numerically. The superelement formulation is used to study the localized effects in a masonry assemblage strengthened with composite materials. This unique structural form is characterized by a vast dispersion of geometrical and elastic scales, presence of irregular regions, and concentrations of stresses. These localized three-dimensional (3D) stress fields are characterized and their sensitivity to various mechanical and geometrical properties is assessed. Conclusions regarding the impact of the localized effects are provided. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000422 [article] Localized effects in walls strengthened with externally bonded composite materials [texte imprimé] / Dvir Elmalich, Auteur ; Rabinovitch, Oded, Auteur . - 2012 . - pp.1112–1126. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 9 (Septembre 2012) . - pp.1112–1126. Mots-clés : Composite  materials  Finite-element  method  Masonry  Numerical  analysis  Stress  analysis  Structural  analysis  Stress  concentration Résumé : The localized effects and, particularly, the stress and deformation concentrations near edges, mortar joints, and irregular points in walls strengthened with externally bonded composite materials are studied. To quantify the structural behavior and to cope with the coupling of large-scale and localized-scale effects, a substructuring procedure that uses a specially tailored high-order finite element is developed. The specially tailored element accounts for the bidirectional behavior of the wall and for the interfacial interaction between the adhesively bonded components. The formulation uses a first-order shear deformation orthotropic plate theory for the independent modeling of the existing wall and the composite layers and a high-order theory for the modeling of the displacement fields of the adhesive layers. A static condensation-based substructuring procedure is used for the formulation of a superelement. The computational strength and the convergence characteristics of the high-order superelement formulation are demonstrated numerically. The superelement formulation is used to study the localized effects in a masonry assemblage strengthened with composite materials. This unique structural form is characterized by a vast dispersion of geometrical and elastic scales, presence of irregular regions, and concentrations of stresses. These localized three-dimensional (3D) stress fields are characterized and their sensitivity to various mechanical and geometrical properties is assessed. Conclusions regarding the impact of the localized effects are provided. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000422

Nonlinear analysis of masonry arches strengthened with composite materials / Dvir Elmalich in Journal of engineering mechanics, Vol. 136 N° 8 (Août 2010) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 136 N° 8 (Août 2010) . - pp. 996-1005 Titre : Nonlinear analysis of masonry arches strengthened with composite materials Type de document : texte imprimé Auteurs : Dvir Elmalich, Auteur ; Oded Rabinovitch, Auteur Article en page(s) : pp. 996-1005 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Masonry  Arches  Nonlinear  analysis  Bonding  Composite  materials  Finite  element  method. Résumé : The nonlinear behavior of masonry arches strengthened with externally bonded composite materials is investigated. A finite-element (FE) formulation that is specially tailored for the nonlinear analysis of the strengthened arch is developed. The FE formulation takes into account material nonlinearity of the masonry construction and high-order kinematic relations for the layered element. Implementation of the above concept in the FE framework reduces the general problem to a one-dimensional nonlinear formulation in polar coordinates with a closed-form representation of the elemental Jacobian matrix (tangent stiffness). A numerical study that examines the capabilities of the model and highlights various aspects of the nonlinear behavior of the strengthened masonry arch is presented. Emphasis is placed on the unique effects near irregular points and the nonlinear evolution of these effects through the loading process. A comparison with experimental results and a discussion of the correlating aspects and the ones that designate needs of further study are also presented. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...] [article] Nonlinear analysis of masonry arches strengthened with composite materials [texte imprimé] / Dvir Elmalich, Auteur ; Oded Rabinovitch, Auteur . - pp. 996-1005. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 8 (Août 2010) . - pp. 996-1005 Mots-clés : Masonry  Arches  Nonlinear  analysis  Bonding  Composite  materials  Finite  element  method. Résumé : The nonlinear behavior of masonry arches strengthened with externally bonded composite materials is investigated. A finite-element (FE) formulation that is specially tailored for the nonlinear analysis of the strengthened arch is developed. The FE formulation takes into account material nonlinearity of the masonry construction and high-order kinematic relations for the layered element. Implementation of the above concept in the FE framework reduces the general problem to a one-dimensional nonlinear formulation in polar coordinates with a closed-form representation of the elemental Jacobian matrix (tangent stiffness). A numerical study that examines the capabilities of the model and highlights various aspects of the nonlinear behavior of the strengthened masonry arch is presented. Emphasis is placed on the unique effects near irregular points and the nonlinear evolution of these effects through the loading process. A comparison with experimental results and a discussion of the correlating aspects and the ones that designate needs of further study are also presented. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...]