Documents disponibles écrits par cet auteur

Experimental evaluation of pretopped precast diaphragm critical flexure joint under seismic demands / D. Zhang in Journal of structural engineering, Vol. 137 N° 10 (Octobre 2011) 

Public ISBD [article]  in Journal of structural engineering > Vol. 137 N° 10 (Octobre 2011) . - pp. 1063-1074 Titre : Experimental evaluation of pretopped precast diaphragm critical flexure joint under seismic demands Type de document : texte imprimé Auteurs : D. Zhang, Auteur ; R. B. Fleischman, Auteur ; C. J. Naito, Auteur Année de publication : 2012 Article en page(s) : pp. 1063-1074 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Diaphragms  Concrete  Precast  Seismic  design  Tests Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Precast concrete diaphragm seismic response is examined in experimental research integrating model-based simulation with physical testing. The experimental substructure is the diaphragm critical flexural region of a prototype precast parking structure. This region is expected to undergo significant inelastic flexural deformation, while potentially nonductile regions remain elastic on the basis of capacity design rules from an emerging design methodology. The physical test is conducted at half-scale. The test specimen is detailed using diaphragm reinforcement intended to meet deformability requirements. Predetermined displacement histories are applied to the test specimen on the basis of nonlinear transient dynamic analyses of the prototype structure. The loading history is applied by a test fixture capable of simultaneously providing shear, axial, and moment to the joint. Moment strength, stiffness, rotational deformation capacity, and progressive damage are examined under a sequence of increasing intensity earthquakes. Design recommendations are provided. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i10/p1063_s1?isAuthorized=no [article] Experimental evaluation of pretopped precast diaphragm critical flexure joint under seismic demands [texte imprimé] / D. Zhang, Auteur ; R. B. Fleischman, Auteur ; C. J. Naito, Auteur . - 2012 . - pp. 1063-1074. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 10 (Octobre 2011) . - pp. 1063-1074 Mots-clés : Diaphragms  Concrete  Precast  Seismic  design  Tests Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Precast concrete diaphragm seismic response is examined in experimental research integrating model-based simulation with physical testing. The experimental substructure is the diaphragm critical flexural region of a prototype precast parking structure. This region is expected to undergo significant inelastic flexural deformation, while potentially nonductile regions remain elastic on the basis of capacity design rules from an emerging design methodology. The physical test is conducted at half-scale. The test specimen is detailed using diaphragm reinforcement intended to meet deformability requirements. Predetermined displacement histories are applied to the test specimen on the basis of nonlinear transient dynamic analyses of the prototype structure. The loading history is applied by a test fixture capable of simultaneously providing shear, axial, and moment to the joint. Moment strength, stiffness, rotational deformation capacity, and progressive damage are examined under a sequence of increasing intensity earthquakes. Design recommendations are provided. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i10/p1063_s1?isAuthorized=no

Precast concrete diaphragm connector performance database / R. Ren in Journal of structural engineering, Vol. 139 N° 1 (Janvier 2013) 

Public ISBD [article]  in Journal of structural engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 15–27 Titre : Precast concrete diaphragm connector performance database Type de document : texte imprimé Auteurs : R. Ren, Auteur ; C. J. Naito, Auteur Année de publication : 2013 Article en page(s) : pp. 15–27 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Precast  Concrete  Diaphragm  Connectors  Databases  Tests  Models Résumé : A variety of connector details are used to provide integrity and force transfer between precast concrete panels in building floor diaphragms. To assess the adequacy of these connectors a large number of experiments have been conducted on discrete welded connectors used in precast concrete double-tee floor panels. A standard procedure for developing simplified response curves from original test data is used to generate simplified curves from each of the tests conducted. The calculated results of over 200 experiments are summarized in a comprehensive performance database. This database provides the stiffness, strength, and deformation properties of each connector detail examined. The connectors are divided into one of the following three displacement-based categories: low deformation element (LDE), moderate deformation element (MDE), and high deformation element (HDE), based on the performance measured in the experiments. A simplified pushover modeling approach is developed to estimate the in-plane maximum midspan flexural deflection and shear sliding of a diaphragm subjected to a static uniform load applied parallel to the span of the diaphragm system. This method begins with developing the shape functions of the joint moment-rotation and shear-sliding deformation responses by utilizing the information included in the performance database and then by estimating the in-plane flexural and shear resistance-displacement responses of the diaphragm system. Estimation of flexural and shear responses of the diaphragm designed with connectors in the LDE, MDE, and HDE categories are conducted as examples. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000598 [article] Precast concrete diaphragm connector performance database [texte imprimé] / R. Ren, Auteur ; C. J. Naito, Auteur . - 2013 . - pp. 15–27. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 139 N° 1 (Janvier 2013) . - pp. 15–27 Mots-clés : Precast  Concrete  Diaphragm  Connectors  Databases  Tests  Models Résumé : A variety of connector details are used to provide integrity and force transfer between precast concrete panels in building floor diaphragms. To assess the adequacy of these connectors a large number of experiments have been conducted on discrete welded connectors used in precast concrete double-tee floor panels. A standard procedure for developing simplified response curves from original test data is used to generate simplified curves from each of the tests conducted. The calculated results of over 200 experiments are summarized in a comprehensive performance database. This database provides the stiffness, strength, and deformation properties of each connector detail examined. The connectors are divided into one of the following three displacement-based categories: low deformation element (LDE), moderate deformation element (MDE), and high deformation element (HDE), based on the performance measured in the experiments. A simplified pushover modeling approach is developed to estimate the in-plane maximum midspan flexural deflection and shear sliding of a diaphragm subjected to a static uniform load applied parallel to the span of the diaphragm system. This method begins with developing the shape functions of the joint moment-rotation and shear-sliding deformation responses by utilizing the information included in the performance database and then by estimating the in-plane flexural and shear resistance-displacement responses of the diaphragm system. Estimation of flexural and shear responses of the diaphragm designed with connectors in the LDE, MDE, and HDE categories are conducted as examples. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000598