Long-term behavior of composite beams under positive and negative bending. II, Analytical study / Jiansheng Fan in Journal of structural engineering, Vol. 136 N° 7 (Juillet 2010)  

Public ISBD [article]  inJournal of structural engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 858-865 Titre : Long-term behavior of composite beams under positive and negative bending. II, Analytical study Type de document : texte imprimé Auteurs : Jiansheng Fan, Auteur ; Xin Nie, Auteur ; Li, Quan, Auteur Année de publication : 2011 Article en page(s) : pp. 858-865 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Shrinkage Creep Effective modulus Cracking Composite beams Serviceability Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The creep, shrinkage, and cracking of concrete may induce time-dependent changes in the stresses, internal forces, and deflections of steel-concrete composite beams. This paper presents an analytical model to consider these effects in analyzing the long-term behavior of composite beams under service loads using the step-by-step procedure. Under negative moments, the model accounts for the cracking, stress relaxing, tension stiffening, creep, and shrinkage of concrete. Meanwhile, a method is proposed to calculate the maximum crack width of the concrete slab by considering the shrinkage and creep effects. Four composite beams continuously loaded for about 3 years were analyzed using the proposed model. A good agreement is observed between the experimental results and the calculations by the proposed model. A discussion is also made about the aging coefficients in the age-adjusted effective modulus method under different loading conditions. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i7/p858_s1?isAuthorized=no [article] Long-term behavior of composite beams under positive and negative bending. II, Analytical study [texte imprimé] / Jiansheng Fan, Auteur ; Xin Nie, Auteur ; Li, Quan, Auteur . - 2011 . - pp. 858-865. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 858-865 Mots-clés : Shrinkage Creep Effective modulus Cracking Composite beams Serviceability Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The creep, shrinkage, and cracking of concrete may induce time-dependent changes in the stresses, internal forces, and deflections of steel-concrete composite beams. This paper presents an analytical model to consider these effects in analyzing the long-term behavior of composite beams under service loads using the step-by-step procedure. Under negative moments, the model accounts for the cracking, stress relaxing, tension stiffening, creep, and shrinkage of concrete. Meanwhile, a method is proposed to calculate the maximum crack width of the concrete slab by considering the shrinkage and creep effects. Four composite beams continuously loaded for about 3 years were analyzed using the proposed model. A good agreement is observed between the experimental results and the calculations by the proposed model. A discussion is also made about the aging coefficients in the age-adjusted effective modulus method under different loading conditions. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i7/p858_s1?isAuthorized=no

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