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Multicriteria capacity envelopes for biaxial bending of concrete hydraulic structures / Lucian Stefan in Journal of structural engineering, Vol. 136 N° 9 (Septembre 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 9 (Septembre 2010) . - pp. 1035-1043 Titre : Multicriteria capacity envelopes for biaxial bending of concrete hydraulic structures Type de document : texte imprimé Auteurs : Lucian Stefan, Auteur ; Pierre Lege, Auteur Année de publication : 2011 Article en page(s) : pp. 1035-1043 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Load  bearing  capacity  Bending  Biaxial  loads  Cracking  Hydraulic  structures  Concrete  structures  Uplift  pressure  Reinforced  concrete Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Envelopes for biaxial bending capacity of reinforced concrete elements are used extensively in design or in structural safety evaluation to verify the adequacy of internal force resultants from series of axial P and bending moments Mx and My loading pairs computed for prescribed load combinations. However, existing methods to construct P-Mx-My (PMM) interaction curves are not appropriate for concrete hydraulic structures because (1) pressurized water could penetrate in cracks leading to a coupled hydromechanical problem and (2) the structural performance is assessed using several criteria related to the allowable cracked area as well as allowable compressive (tensile) stresses for usual, unusual, and extreme load combinations. This paper presents a methodology to construct PMM interaction curves for arbitrary cross sections of hydraulic structures considering multiperformance criteria, water penetration in cracks, as well as the presence of reinforcing steel. The computations are based on a robust and efficient isogonic approach based on strength of materials where the position of the neutral axis is systematically varied over the cross section to find PMM equilibrium solutions. Four application examples of the proposed approach are presented (1) to illustrate its versatility, (2) to validate the results, and (3) to show its convergence properties. In some cases, PMM capacity envelopes are formed by distinct closed surfaces where equilibrium solutions are possible. This type of PMM capacity envelope, which the proposed algorithm is able to construct, is not found for classical reinforced concrete elements. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i9/p1035_s1?isAuthorized=no [article] Multicriteria capacity envelopes for biaxial bending of concrete hydraulic structures [texte imprimé] / Lucian Stefan, Auteur ; Pierre Lege, Auteur . - 2011 . - pp. 1035-1043. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 9 (Septembre 2010) . - pp. 1035-1043 Mots-clés : Load  bearing  capacity  Bending  Biaxial  loads  Cracking  Hydraulic  structures  Concrete  structures  Uplift  pressure  Reinforced  concrete Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Envelopes for biaxial bending capacity of reinforced concrete elements are used extensively in design or in structural safety evaluation to verify the adequacy of internal force resultants from series of axial P and bending moments Mx and My loading pairs computed for prescribed load combinations. However, existing methods to construct P-Mx-My (PMM) interaction curves are not appropriate for concrete hydraulic structures because (1) pressurized water could penetrate in cracks leading to a coupled hydromechanical problem and (2) the structural performance is assessed using several criteria related to the allowable cracked area as well as allowable compressive (tensile) stresses for usual, unusual, and extreme load combinations. This paper presents a methodology to construct PMM interaction curves for arbitrary cross sections of hydraulic structures considering multiperformance criteria, water penetration in cracks, as well as the presence of reinforcing steel. The computations are based on a robust and efficient isogonic approach based on strength of materials where the position of the neutral axis is systematically varied over the cross section to find PMM equilibrium solutions. Four application examples of the proposed approach are presented (1) to illustrate its versatility, (2) to validate the results, and (3) to show its convergence properties. In some cases, PMM capacity envelopes are formed by distinct closed surfaces where equilibrium solutions are possible. This type of PMM capacity envelope, which the proposed algorithm is able to construct, is not found for classical reinforced concrete elements. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i9/p1035_s1?isAuthorized=no