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Linear elastic fracture mechanics pullout analyses of headed anchors in stressed concrete / Piccinin, R. in Journal of engineering mechanics, Vol. 136 N° 6 (Juin 2010) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 136 N° 6 (Juin 2010) . - pp. 761-768 Titre : Linear elastic fracture mechanics pullout analyses of headed anchors in stressed concrete Type de document : texte imprimé Auteurs : Piccinin, R., Auteur ; Ballarini, R., Auteur ; Cattaneo, S., Auteur Article en page(s) : pp. 761-768 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Anchors  Axisymmetry  Finite  element  method  Prestressed  concrete  Cracking  Tensile  strength. Résumé : The results of research initiated in the early 1980s led to the replacement of plasticity-based design guidelines for the load-carrying capacity of headed anchors embedded in concrete with those developed using fracture mechanics. While provisions are available in the design codes that account for the presence of tensile fields causing concrete cracking, no provisions are available for anchors embedded in prestressed concrete. This paper presents the results of linear elastic fracture mechanics (LEFM) analyses and of a preliminary experimental investigation of the progressive failure of headed anchors embedded in a concrete matrix under compressive or tensile prestress. The model predicts an increase (decrease) in load-carrying capacity and ductility with increasing compressive (tensile) prestress. It is shown that despite neglecting the dependence on size of concrete fracture toughness, LEFM predicts with remarkable accuracy the functional dependence of the ultimate capacity on prestress. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&smode=strres [...] [article] Linear elastic fracture mechanics pullout analyses of headed anchors in stressed concrete [texte imprimé] / Piccinin, R., Auteur ; Ballarini, R., Auteur ; Cattaneo, S., Auteur . - pp. 761-768. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 6 (Juin 2010) . - pp. 761-768 Mots-clés : Anchors  Axisymmetry  Finite  element  method  Prestressed  concrete  Cracking  Tensile  strength. Résumé : The results of research initiated in the early 1980s led to the replacement of plasticity-based design guidelines for the load-carrying capacity of headed anchors embedded in concrete with those developed using fracture mechanics. While provisions are available in the design codes that account for the presence of tensile fields causing concrete cracking, no provisions are available for anchors embedded in prestressed concrete. This paper presents the results of linear elastic fracture mechanics (LEFM) analyses and of a preliminary experimental investigation of the progressive failure of headed anchors embedded in a concrete matrix under compressive or tensile prestress. The model predicts an increase (decrease) in load-carrying capacity and ductility with increasing compressive (tensile) prestress. It is shown that despite neglecting the dependence on size of concrete fracture toughness, LEFM predicts with remarkable accuracy the functional dependence of the ultimate capacity on prestress. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&smode=strres [...]

Pullout capacity of headed anchors in prestressed concrete / Piccinin, R. in Journal of engineering mechanics, Vol. 138 N° 7 (Juillet 2012) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 138 N° 7 (Juillet 2012) . - pp.877–887. Titre : Pullout capacity of headed anchors in prestressed concrete Type de document : texte imprimé Auteurs : Piccinin, R., Auteur ; Ballarini, R., Auteur ; Cattaneo, S., Auteur Année de publication : 2012 Article en page(s) : pp.877–887. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Anchors  Concrete  breakout  Finite-element  method  Cohesive  elements  Axisymmetry  Prestressed  concrete  Cracking Résumé : A combined experimental and computational study shows that the pullout capacity of anchors embedded at small depths in prestressed concrete is associated with the strongest possible (linear elastic fracture mechanics) size effect. A design formula is proposed that reflects the effects of embedment depth and the nondimensional parameters that quantify the level of prestressing and the characteristic length of the matrix. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000395 [article] Pullout capacity of headed anchors in prestressed concrete [texte imprimé] / Piccinin, R., Auteur ; Ballarini, R., Auteur ; Cattaneo, S., Auteur . - 2012 . - pp.877–887. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 7 (Juillet 2012) . - pp.877–887. Mots-clés : Anchors  Concrete  breakout  Finite-element  method  Cohesive  elements  Axisymmetry  Prestressed  concrete  Cracking Résumé : A combined experimental and computational study shows that the pullout capacity of anchors embedded at small depths in prestressed concrete is associated with the strongest possible (linear elastic fracture mechanics) size effect. A design formula is proposed that reflects the effects of embedment depth and the nondimensional parameters that quantify the level of prestressing and the characteristic length of the matrix. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000395