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Flexural behavior of steel fibrous reinforced concrete deep beams / Giuseppe Campione in Journal of structural engineering, Vol. 138 N° 2 (Fevrier 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 235-246 Titre : Flexural behavior of steel fibrous reinforced concrete deep beams Type de document : texte imprimé Auteurs : Giuseppe Campione, Auteur Année de publication : 2012 Article en page(s) : pp. 235-246 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Deep  beams  Reinforced  concrete  Steel  fibers  Stirrups  Load-deflection  curves Résumé : Experimental research was carried out regarding the flexural behavior of deep beams cast with plain and fibrous concrete with hooked steel fibers, and subjected to monotonic vertical loads. Four deep fiber-reinforced concrete beams were cast. Two of them were made of plain concrete with main and web steel reinforcements (RC), and two were made of hooked steel fiber-reinforced concrete (SFRC) with main steel reinforcements. The experimental results show the brittle behavior of reinforced deep RC members characterized by crushing of concrete struts and fracture of web steel bars. SFRC deep beams exhibit higher strength and, above all, ductility with respect to RC members due to the bridging actions of fibers across main and secondary cracks. From the analytical point of view, a softened strut-and-tie macromodel able to reproduce the flexural behavior (in terms of multilinear load-deflection curves) of deep beams in plain and fibrous concrete and with the presence of horizontal steel bars, including softening of compressed struts and yielding of steel bars, is presented. The model is able to take into account the tensile behavior of main bars embedded in the surrounding concrete and the softening of the compressed strut, the arrangement and percentage of the steel bars, and the percentage and aspect ratio of steel fibers. The experimental results obtained here and those available in the literature are compared with the results obtained through the proposed model and with the other models given in the literature, showing good agreement. Finally, a validation of the proposed model is made numerically by using a nonlinear finite-element program (ATENA-2D) able to analyze the flexural behavior of deep members. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v138/i2/p235_s1?isAuthorized=no [article] Flexural behavior of steel fibrous reinforced concrete deep beams [texte imprimé] / Giuseppe Campione, Auteur . - 2012 . - pp. 235-246. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 235-246 Mots-clés : Deep  beams  Reinforced  concrete  Steel  fibers  Stirrups  Load-deflection  curves Résumé : Experimental research was carried out regarding the flexural behavior of deep beams cast with plain and fibrous concrete with hooked steel fibers, and subjected to monotonic vertical loads. Four deep fiber-reinforced concrete beams were cast. Two of them were made of plain concrete with main and web steel reinforcements (RC), and two were made of hooked steel fiber-reinforced concrete (SFRC) with main steel reinforcements. The experimental results show the brittle behavior of reinforced deep RC members characterized by crushing of concrete struts and fracture of web steel bars. SFRC deep beams exhibit higher strength and, above all, ductility with respect to RC members due to the bridging actions of fibers across main and secondary cracks. From the analytical point of view, a softened strut-and-tie macromodel able to reproduce the flexural behavior (in terms of multilinear load-deflection curves) of deep beams in plain and fibrous concrete and with the presence of horizontal steel bars, including softening of compressed struts and yielding of steel bars, is presented. The model is able to take into account the tensile behavior of main bars embedded in the surrounding concrete and the softening of the compressed strut, the arrangement and percentage of the steel bars, and the percentage and aspect ratio of steel fibers. The experimental results obtained here and those available in the literature are compared with the results obtained through the proposed model and with the other models given in the literature, showing good agreement. Finally, a validation of the proposed model is made numerically by using a nonlinear finite-element program (ATENA-2D) able to analyze the flexural behavior of deep members. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v138/i2/p235_s1?isAuthorized=no

Flexural behaviour of external R/C steel fibre reinforced beam-column joints / Giuseppina Amato in European journal of environmental and civil engineering, Vol. 15 N° 9 (Novembre 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 9 (Novembre 2011) . - pp. 1253-1276 Titre : Flexural behaviour of external R/C steel fibre reinforced beam-column joints Titre original : Comportement en flexion de nœuds externes poteau-poutre en béton de fibres métalliques Type de document : texte imprimé Auteurs : Giuseppina Amato, Auteur ; Giuseppe Campione, Auteur ; Liborio Cavaleri, Auteur Année de publication : 2012 Article en page(s) : pp. 1253-1276 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Beam-column  joint  Fibre  reinforced  concrete  Load-deflection  curves Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A softened strut-and-tie macro model able to reproduce the flexural behaviour of external beam-column joint is presented. The model is specific for concrete with hooked steel fibres (FRC) and it is designed to calculate the flexural response, as load-deflection curve, of a beam-column sub-assemblages. The model considers the presence of a constant vertical load acting on the column and of a monotonically increasing lateral force applied at the tip of the beam. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16935 [article] Flexural behaviour of external R/C steel fibre reinforced beam-column joints = Comportement en flexion de nœuds externes poteau-poutre en béton de fibres métalliques [texte imprimé] / Giuseppina Amato, Auteur ; Giuseppe Campione, Auteur ; Liborio Cavaleri, Auteur . - 2012 . - pp. 1253-1276. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 9 (Novembre 2011) . - pp. 1253-1276 Mots-clés : Beam-column  joint  Fibre  reinforced  concrete  Load-deflection  curves Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A softened strut-and-tie macro model able to reproduce the flexural behaviour of external beam-column joint is presented. The model is specific for concrete with hooked steel fibres (FRC) and it is designed to calculate the flexural response, as load-deflection curve, of a beam-column sub-assemblages. The model considers the presence of a constant vertical load acting on the column and of a monotonically increasing lateral force applied at the tip of the beam. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16935