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Simplified optimum design procedure for special unbonded posttensioned split precast shear walls / R. A. Hawileh in Journal of structural engineering, Vol. 139 N° 2 (Février 2013) 

Public ISBD [article]  in Journal of structural engineering > Vol. 139 N° 2 (Février 2013) . - pp. 294–299 Titre : Simplified optimum design procedure for special unbonded posttensioned split precast shear walls Type de document : texte imprimé Auteurs : R. A. Hawileh, Auteur ; E. I. Saqan, Auteur ; J. A. Abdalla, Auteur Année de publication : 2013 Article en page(s) : pp. 294–299 Note générale : structural engineering Langues : Anglais (eng) Mots-clés : shear  walls;  post  tensioning;  design;  bonding Résumé : In this paper, a set of simplified design equations for an unbonded posttensioned (PT) precast split hybrid shear wall system is developed. Such a system was proposed by the Precast Seismic Structural Systems (PRESSS) and can be used as a bearing wall or a special reinforced concrete wall for building frames, as defined in ASCE/SEI 7, for eliminating residual drift after seismic events. The panels are anchored to the foundation with unbonded PT tendons located at the panel center; adjacent panels are connected with uniformly distributed energy dissipating coupling devices. An iterative design procedure to calculate the required area of the PT reinforcement and the total yield force of all shear connectors in one vertical joint was proposed by PRESSS. This iterative procedure is exact, but tedious and lengthy. A simpler nondimensional chart-based design procedure was proposed by the writers. This procedure is efficient, but has limitations. A noniterative procedure adopted by ACI ITG-5.2, although simple, does not yield the optimum combination of the shear connectors force and PT force. The set of simplified design equations proposed in this study overcomes the shortcomings of these three procedures. It is simple, direct (noniterative), general, and yields the optimum design in fewer number of steps. The proposed design equations predicted values are accurate and are normally within ± 2% of the exact optimum solution. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000631 [article] Simplified optimum design procedure for special unbonded posttensioned split precast shear walls [texte imprimé] / R. A. Hawileh, Auteur ; E. I. Saqan, Auteur ; J. A. Abdalla, Auteur . - 2013 . - pp. 294–299. structural engineering Langues : Anglais (eng) in Journal of structural engineering > Vol. 139 N° 2 (Février 2013) . - pp. 294–299 Mots-clés : shear  walls;  post  tensioning;  design;  bonding Résumé : In this paper, a set of simplified design equations for an unbonded posttensioned (PT) precast split hybrid shear wall system is developed. Such a system was proposed by the Precast Seismic Structural Systems (PRESSS) and can be used as a bearing wall or a special reinforced concrete wall for building frames, as defined in ASCE/SEI 7, for eliminating residual drift after seismic events. The panels are anchored to the foundation with unbonded PT tendons located at the panel center; adjacent panels are connected with uniformly distributed energy dissipating coupling devices. An iterative design procedure to calculate the required area of the PT reinforcement and the total yield force of all shear connectors in one vertical joint was proposed by PRESSS. This iterative procedure is exact, but tedious and lengthy. A simpler nondimensional chart-based design procedure was proposed by the writers. This procedure is efficient, but has limitations. A noniterative procedure adopted by ACI ITG-5.2, although simple, does not yield the optimum combination of the shear connectors force and PT force. The set of simplified design equations proposed in this study overcomes the shortcomings of these three procedures. It is simple, direct (noniterative), general, and yields the optimum design in fewer number of steps. The proposed design equations predicted values are accurate and are normally within ± 2% of the exact optimum solution. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000631