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Punching shear behavior of externally prestressed concrete slabs / H. Mostafaei in Journal of structural engineering, Vol. 137 N° 1 (Janvier 2011) 

Public ISBD [article]  in Journal of structural engineering > Vol. 137 N° 1 (Janvier 2011) . - pp. 100-108 Titre : Punching shear behavior of externally prestressed concrete slabs Type de document : texte imprimé Auteurs : H. Mostafaei, Auteur ; Vecchio, F. J., Auteur ; P. Gauvreau, Auteur Année de publication : 2011 Article en page(s) : pp. 100-108 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Analysis  Bridge  deck  Design  Fiber-reinforced  concrete  Finite  element  Prestressed  Punching  Shear  Slabs Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The use of externally post-tensioned fiber-reinforced concrete decks in highway bridge structures is seen as a viable option in the move toward the design and construction of high-performance structures. However, with the thin unreinforced deck slabs that may result, punching shear is a potential concern. An experimental program is described in which the punching shear behavior of externally prestressed slabs is investigated, both with plain and fiber-reinforced concrete specimens. Results indicate that significant improvements in strength, ductility, energy absorption and nonbrittleness of failure can be achieved with fiber reinforcement. Nonlinear finite-element analysis procedures are used to model the specimens, and reasonably accurate simulations of behavior are obtained. Design code procedures are found to be unconservative in estimating the punching shear strength of these elements, whereas a commonly used analytical model is found to be overly conservative. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i1/p100_s1?isAuthorized=no [article] Punching shear behavior of externally prestressed concrete slabs [texte imprimé] / H. Mostafaei, Auteur ; Vecchio, F. J., Auteur ; P. Gauvreau, Auteur . - 2011 . - pp. 100-108. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 1 (Janvier 2011) . - pp. 100-108 Mots-clés : Analysis  Bridge  deck  Design  Fiber-reinforced  concrete  Finite  element  Prestressed  Punching  Shear  Slabs Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The use of externally post-tensioned fiber-reinforced concrete decks in highway bridge structures is seen as a viable option in the move toward the design and construction of high-performance structures. However, with the thin unreinforced deck slabs that may result, punching shear is a potential concern. An experimental program is described in which the punching shear behavior of externally prestressed slabs is investigated, both with plain and fiber-reinforced concrete specimens. Results indicate that significant improvements in strength, ductility, energy absorption and nonbrittleness of failure can be achieved with fiber reinforcement. Nonlinear finite-element analysis procedures are used to model the specimens, and reasonably accurate simulations of behavior are obtained. Design code procedures are found to be unconservative in estimating the punching shear strength of these elements, whereas a commonly used analytical model is found to be overly conservative. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i1/p100_s1?isAuthorized=no