Documents disponibles écrits par cet auteur

Effect of spandrel beam to double tee connection characteristic on flexure-controlled precast diaphragms / G. Wan in Journal of structural engineering, Vol. 138 N° 2 (Fevrier 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 247-257 Titre : Effect of spandrel beam to double tee connection characteristic on flexure-controlled precast diaphragms Type de document : texte imprimé Auteurs : G. Wan, Auteur ; R. B. Fleischman, Auteur ; D. Zhang, Auteur Année de publication : 2012 Article en page(s) : pp. 247-257 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Floor  diaphragms  Precast  concrete  Spandrel  beams  Seismic  design Résumé : Precast spandrel beams are often used on the perimeter of precast buildings to support the precast floor units. These elements are typically not considered part of the lateral force resisting system. However, the presence of the spandrel beams in the floor system may modify the strength, stiffness, and deformation capacity of the precast floor diaphragm. The nature of this response is highly dependent on the characteristics of the details connecting the spandrel to the precast floor system. These details are often welded connections used primarily for erection stability and designed without diaphragm action in mind. With emerging design methodologies for precast diaphragms requiring better-defined performance, the impact of the spandrel beams must be accounted for. Accordingly, analytical research is presented here that examines the effect of spandrel-beam-connecting details on the global characteristics and local demands of a flexure-controlled precast floor diaphragm. Design recommendations are provided. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v138/i2/p247_s1?isAuthorized=no [article] Effect of spandrel beam to double tee connection characteristic on flexure-controlled precast diaphragms [texte imprimé] / G. Wan, Auteur ; R. B. Fleischman, Auteur ; D. Zhang, Auteur . - 2012 . - pp. 247-257. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 247-257 Mots-clés : Floor  diaphragms  Precast  concrete  Spandrel  beams  Seismic  design Résumé : Precast spandrel beams are often used on the perimeter of precast buildings to support the precast floor units. These elements are typically not considered part of the lateral force resisting system. However, the presence of the spandrel beams in the floor system may modify the strength, stiffness, and deformation capacity of the precast floor diaphragm. The nature of this response is highly dependent on the characteristics of the details connecting the spandrel to the precast floor system. These details are often welded connections used primarily for erection stability and designed without diaphragm action in mind. With emerging design methodologies for precast diaphragms requiring better-defined performance, the impact of the spandrel beams must be accounted for. Accordingly, analytical research is presented here that examines the effect of spandrel-beam-connecting details on the global characteristics and local demands of a flexure-controlled precast floor diaphragm. Design recommendations are provided. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v138/i2/p247_s1?isAuthorized=no

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

A single-resource revenue management problem with random resource consumptions / W. Zhuang in Journal of the operational research society (JORS), Vol. 63 N° 9 (Septembre 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 9 (Septembre 2012) . - pp. 1213–1227 Titre : A single-resource revenue management problem with random resource consumptions Type de document : texte imprimé Auteurs : W. Zhuang, Auteur ; M. Gumus, Auteur ; D. Zhang, Auteur Année de publication : 2012 Article en page(s) : pp. 1213–1227 Note générale : Operational research Langues : Anglais (eng) Mots-clés : Revenue  management  Dynamic  programming  Transportation Index. décimale : 001.424 Résumé : We study a single-resource multi-class revenue management problem where the resource consumption for each class is random and only revealed at departure. The model is motivated by cargo revenue management problems in the airline and other shipping industries. We study how random resource consumption distribution affects the optimal expected profit and identify a preference acceptance order on classes. For a special case where the resource consumption for each class follows the same distribution, we fully characterize the optimal control policy. We then propose two easily computable heuristics: (i) a class-independent heuristic through parameter scaling, and (ii) a decomposition heuristic that decomposes the dynamic programming formulation into a collection of one-dimensional problems. We conduct extensive numerical experiments to investigate the performance of the two heuristics and compared them with several widely studied heuristic policies. Our results show that both heuristics work very well, with class-independent heuristic slightly better between the two. In particular, they consistently outperform heuristics that ignore demand and/or resource consumption uncertainty. Our results demonstrate the importance of considering random resource consumption as another problem dimension in revenue management applications. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n9/abs/jors2011129a.html [article] A single-resource revenue management problem with random resource consumptions [texte imprimé] / W. Zhuang, Auteur ; M. Gumus, Auteur ; D. Zhang, Auteur . - 2012 . - pp. 1213–1227. Operational research Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 9 (Septembre 2012) . - pp. 1213–1227 Mots-clés : Revenue  management  Dynamic  programming  Transportation Index. décimale : 001.424 Résumé : We study a single-resource multi-class revenue management problem where the resource consumption for each class is random and only revealed at departure. The model is motivated by cargo revenue management problems in the airline and other shipping industries. We study how random resource consumption distribution affects the optimal expected profit and identify a preference acceptance order on classes. For a special case where the resource consumption for each class follows the same distribution, we fully characterize the optimal control policy. We then propose two easily computable heuristics: (i) a class-independent heuristic through parameter scaling, and (ii) a decomposition heuristic that decomposes the dynamic programming formulation into a collection of one-dimensional problems. We conduct extensive numerical experiments to investigate the performance of the two heuristics and compared them with several widely studied heuristic policies. Our results show that both heuristics work very well, with class-independent heuristic slightly better between the two. In particular, they consistently outperform heuristics that ignore demand and/or resource consumption uncertainty. Our results demonstrate the importance of considering random resource consumption as another problem dimension in revenue management applications. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n9/abs/jors2011129a.html

A zinc/silicon dioxide composite film: Fabrication and anti-corrosion characterization / Z. F. Lin in Materials and corrosion, Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 416–420 Titre : A zinc/silicon dioxide composite film: Fabrication and anti-corrosion characterization Type de document : texte imprimé Auteurs : Z. F. Lin, Auteur ; D. Zhang, Auteur ; Y. Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 416–420 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Carbon  steel;  composite  film;  EIS;  polarization Résumé : A zinc/silicon dioxide composite film has been electrodeposited on carbon steel surface via adding tetraethylorthosilicate (TEOS) in zinc nitrate solution. The advantage of this method is that the metal/inorganic composite film can be fabricated without adding solid particles in solution. Polarization curve results showed that the composite film obtained at a TEOS concentration of 0.012 M had the best corrosion resistance. Electrochemical impedance spectroscopy results indicated that this film had a corrosion protection effect in 3.5 wt% sodium chloride solution for hundreds of hours. This kind of composite film can be potentially applied as anti-corrosion coating for metal corrosion protection. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005974/abstract [article] A zinc/silicon dioxide composite film: Fabrication and anti-corrosion characterization [texte imprimé] / Z. F. Lin, Auteur ; D. Zhang, Auteur ; Y. Wang, Auteur . - 2012 . - pp. 416–420. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 416–420 Mots-clés : Carbon  steel;  composite  film;  EIS;  polarization Résumé : A zinc/silicon dioxide composite film has been electrodeposited on carbon steel surface via adding tetraethylorthosilicate (TEOS) in zinc nitrate solution. The advantage of this method is that the metal/inorganic composite film can be fabricated without adding solid particles in solution. Polarization curve results showed that the composite film obtained at a TEOS concentration of 0.012 M had the best corrosion resistance. Electrochemical impedance spectroscopy results indicated that this film had a corrosion protection effect in 3.5 wt% sodium chloride solution for hundreds of hours. This kind of composite film can be potentially applied as anti-corrosion coating for metal corrosion protection. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005974/abstract