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Discrete rotation in RC beams / M. S. Mohamed Ali in Journal of engineering mechanics, Vol. 138 N° 11 (Novembre 2012) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 138 N° 11 (Novembre 2012) . - pp.1317–1325. Titre : Discrete rotation in RC beams Type de document : texte imprimé Auteurs : M. S. Mohamed Ali, Auteur ; D. J. Oehlers, Auteur ; M. Haskett, Auteur Année de publication : 2013 Article en page(s) : pp.1317–1325. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Reinforced  concrete  beams  Rotation  Partial  interaction  Shear  friction Résumé : The ability of a RC beam to rotate is extremely important at both the serviceability and ultimate limit states as it affects deflection, moment redistribution, and the absorption of energy. The rotation in a RC beam can be considered to have two components: the continuous rotation that occurs in the homogenous portions of the beam and that can be determined by straightforward integration of the curvature and the discrete rotation due to the rigid body displacement between crack faces. In this paper, generic closed-form solutions are derived for the discrete rotation across crack faces, which are limited by debonding or fracture of the reinforcement in tension, or softening of the concrete in compression. It is shown how closed-form solutions can be derived for the moment/discrete rotation for the simplest case of a RC beam with a single layer of reinforcement, which could be used as the starting position for much more complex scenarios. The technique developed is generic as it can cope with any type reinforcement and concrete. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000436 [article] Discrete rotation in RC beams [texte imprimé] / M. S. Mohamed Ali, Auteur ; D. J. Oehlers, Auteur ; M. Haskett, Auteur . - 2013 . - pp.1317–1325. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 11 (Novembre 2012) . - pp.1317–1325. Mots-clés : Reinforced  concrete  beams  Rotation  Partial  interaction  Shear  friction Résumé : The ability of a RC beam to rotate is extremely important at both the serviceability and ultimate limit states as it affects deflection, moment redistribution, and the absorption of energy. The rotation in a RC beam can be considered to have two components: the continuous rotation that occurs in the homogenous portions of the beam and that can be determined by straightforward integration of the curvature and the discrete rotation due to the rigid body displacement between crack faces. In this paper, generic closed-form solutions are derived for the discrete rotation across crack faces, which are limited by debonding or fracture of the reinforcement in tension, or softening of the concrete in compression. It is shown how closed-form solutions can be derived for the moment/discrete rotation for the simplest case of a RC beam with a single layer of reinforcement, which could be used as the starting position for much more complex scenarios. The technique developed is generic as it can cope with any type reinforcement and concrete. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000436

Formulation of a shear resistance mechanism for inclined cracks in RC beams / W. Lucas in Journal of structural engineering, Vol. 137 N° 12 (Décembre 2011) 

Public ISBD [article]  in Journal of structural engineering > Vol. 137 N° 12 (Décembre 2011) . - pp. 1480-1488 Titre : Formulation of a shear resistance mechanism for inclined cracks in RC beams Type de document : texte imprimé Auteurs : W. Lucas, Auteur ; D. J. Oehlers, Auteur Année de publication : 2012 Article en page(s) : pp. 1480-1488 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Reinforced  concrete  Shear  behavior  Shear  friction Résumé : The shear capacity of reinforced concrete (RC) members is often associated with sliding across inclined planes often referred to as critical diagonal cracks. However, quantifying the shear capacity of the RC member in terms of the sliding resistance of an inclined plane as a result of shear-friction has been found to be a very complex problem. This is because these sliding planes transcend both initially cracked and uncracked planes, their capacity is also a function of the separation between these sliding planes, and invariably the shear-friction sliding capacity overestimates the shear capacity of the member. In this paper, a structural mechanics model that incorporates shear-friction is developed for quantifying the various components of the shear resistance across a critical diagonal crack because of both longitudinal reinforcement and stirrups. It is shown that the shear resistance is less than would be anticipated from the direct application of shear-friction theory because the compressive force in the uncracked region of concrete is less than can be anticipated and because the shear resistance must provide shear forces to maintain equilibrium prior to resisting the direct shear force. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i12/p1480_s1?isAuthorized=no [article] Formulation of a shear resistance mechanism for inclined cracks in RC beams [texte imprimé] / W. Lucas, Auteur ; D. J. Oehlers, Auteur . - 2012 . - pp. 1480-1488. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 12 (Décembre 2011) . - pp. 1480-1488 Mots-clés : Reinforced  concrete  Shear  behavior  Shear  friction Résumé : The shear capacity of reinforced concrete (RC) members is often associated with sliding across inclined planes often referred to as critical diagonal cracks. However, quantifying the shear capacity of the RC member in terms of the sliding resistance of an inclined plane as a result of shear-friction has been found to be a very complex problem. This is because these sliding planes transcend both initially cracked and uncracked planes, their capacity is also a function of the separation between these sliding planes, and invariably the shear-friction sliding capacity overestimates the shear capacity of the member. In this paper, a structural mechanics model that incorporates shear-friction is developed for quantifying the various components of the shear resistance across a critical diagonal crack because of both longitudinal reinforcement and stirrups. It is shown that the shear resistance is less than would be anticipated from the direct application of shear-friction theory because the compressive force in the uncracked region of concrete is less than can be anticipated and because the shear resistance must provide shear forces to maintain equilibrium prior to resisting the direct shear force. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i12/p1480_s1?isAuthorized=no