Analytical modeling and design validation of posttensioned precast concrete coupling beams for seismic regions / Brad D. Weldon in Journal of structural engineering, Vol. 138 N° 2 (Fevrier 2012)  

Public ISBD [article]  inJournal of structural engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 224-234 Titre : Analytical modeling and design validation of posttensioned precast concrete coupling beams for seismic regions Type de document : texte imprimé Auteurs : Brad D. Weldon, Auteur ; Yahya C. Kurama, Auteur Année de publication : 2012 Article en page(s) : pp. 224-234 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Posttensioned concrete Precast Prestressed Reinforced Coupled walls Coupling Seismic analysis design Shear Résumé : This paper provides an experimental validation on the analytical modeling and design of unbonded posttensioned precast concrete coupling beams. Previous test results from a series of floor-level coupling beam subassembly specimens are compared with the predicted results from a fiber-element analytical model. The test results are also used to validate an idealized coupling beam end moment versus chord rotation relationship that was developed as a design tool following basic principles of equilibrium, compatibility, and constitutive relationships. Based on the experimental and analytical comparisons, the paper presents a seismic design approach to achieve the desired lateral strength, stiffness, ductility, and energy dissipation capacity in unbonded posttensioned precast coupling beams. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v138/i2/p224_s1?isAuthorized=no [article] Analytical modeling and design validation of posttensioned precast concrete coupling beams for seismic regions [texte imprimé] / Brad D. Weldon, Auteur ; Yahya C. Kurama, Auteur . - 2012 . - pp. 224-234. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 224-234 Mots-clés : Posttensioned concrete Precast Prestressed Reinforced Coupled walls Coupling Seismic analysis design Shear Résumé : This paper provides an experimental validation on the analytical modeling and design of unbonded posttensioned precast concrete coupling beams. Previous test results from a series of floor-level coupling beam subassembly specimens are compared with the predicted results from a fiber-element analytical model. The test results are also used to validate an idealized coupling beam end moment versus chord rotation relationship that was developed as a design tool following basic principles of equilibrium, compatibility, and constitutive relationships. Based on the experimental and analytical comparisons, the paper presents a seismic design approach to achieve the desired lateral strength, stiffness, ductility, and energy dissipation capacity in unbonded posttensioned precast coupling beams. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v138/i2/p224_s1?isAuthorized=no

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Experimental evaluation of posttensioned precast concrete coupling beams / Brad D. Weldon in Journal of structural engineering, Vol. 136 N° 9 (Septembre 2010)  

Public ISBD [article]  inJournal of structural engineering > Vol. 136 N° 9 (Septembre 2010) . - pp. 1066-1077 Titre : Experimental evaluation of posttensioned precast concrete coupling beams Type de document : texte imprimé Auteurs : Brad D. Weldon, Auteur ; Yahya C. Kurama, Auteur Année de publication : 2011 Article en page(s) : pp. 1066-1077 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Concrete Posttensioned Precast Prestressed Reinforced Coupled walls Coupling Tests Seismic Walls Shear Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper describes the results from eight half-scale experiments of unbonded posttensioned precast concrete coupling beams under reversed-cyclic lateral loading. Each test specimen includes a coupling beam and the adjacent concrete wall pier regions at a floor level. Under lateral loads, the nonlinear displacements of unbonded posttensioned coupling beams are governed by the opening of gaps at the beam-to-wall joints. Steel top and seat angles are used at the beam ends to yield and provide energy dissipation. The test parameters include the beam posttensioning tendon area and initial stress, initial beam concrete axial stress, angle strength, and beam depth. The results demonstrate the lateral stiffness, strength, and ductility of the coupling beams under cyclic loading, with considerable energy dissipation concentrated in the angles. It is shown that the residual displacements of the structure upon unloading are small due to the restoring effect of the posttensioning force. The sustained chord rotation capacities of the test specimens are compared with those from previous tests of monolithic coupling beams. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i9/p1066_s1?isAuthorized=no [article] Experimental evaluation of posttensioned precast concrete coupling beams [texte imprimé] / Brad D. Weldon, Auteur ; Yahya C. Kurama, Auteur . - 2011 . - pp. 1066-1077. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 9 (Septembre 2010) . - pp. 1066-1077 Mots-clés : Concrete Posttensioned Precast Prestressed Reinforced Coupled walls Coupling Tests Seismic Walls Shear Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper describes the results from eight half-scale experiments of unbonded posttensioned precast concrete coupling beams under reversed-cyclic lateral loading. Each test specimen includes a coupling beam and the adjacent concrete wall pier regions at a floor level. Under lateral loads, the nonlinear displacements of unbonded posttensioned coupling beams are governed by the opening of gaps at the beam-to-wall joints. Steel top and seat angles are used at the beam ends to yield and provide energy dissipation. The test parameters include the beam posttensioning tendon area and initial stress, initial beam concrete axial stress, angle strength, and beam depth. The results demonstrate the lateral stiffness, strength, and ductility of the coupling beams under cyclic loading, with considerable energy dissipation concentrated in the angles. It is shown that the residual displacements of the structure upon unloading are small due to the restoring effect of the posttensioning force. The sustained chord rotation capacities of the test specimens are compared with those from previous tests of monolithic coupling beams. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i9/p1066_s1?isAuthorized=no

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