Documents disponibles écrits par cet auteur

Retrofit of deep concrete coupling beams by a laterally restrained side plate / Bei Cheng in Journal of structural engineering, Vol. 137 N° 4 (Avril 2011) 

Public ISBD [article]  in Journal of structural engineering > Vol. 137 N° 4 (Avril 2011) . - pp. 503-512 Titre : Retrofit of deep concrete coupling beams by a laterally restrained side plate Type de document : texte imprimé Auteurs : Bei Cheng, Auteur ; Ray Kai-Leung Su, Auteur Année de publication : 2011 Article en page(s) : pp. 503-512 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Deep  coupling  beams  Plate  buckling  Restrained  Seismic  retrofitting  Steel  plate Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The existing designs for deep reinforced-concrete (RC) coupling beams with low shear-span ratios and conventionally reinforced shear stirrups tend to fail in a brittle way with limited ductility and deformability under reversed cyclic loading. This paper aims to develop a new retrofitting method for existing deep RC coupling beams that can enhance the deformability and energy dissipation while maintaining flexural stiffness, improving the beams’ performance during an earthquake. Experiments were conducted to test four half-scale deep RC coupling beams with the same geometry and reinforcement layout but with different retrofitting schemes. One beam was tested without retrofitting to act as a control, whereas the others were retrofitted by a bolted steel plate with or without adding a buckling restraining device. This study reveals that the deformation and energy dissipation of the deep RC coupling beams retrofitted with restrained steel plates improved while the flexural stiffness did not increase. Moreover, by using laterally restrained steel plates, the specimens had better postpeak behavior, a more ductile failure mode, and better rotation deformability. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i4/p503_s1?isAuthorized=no [article] Retrofit of deep concrete coupling beams by a laterally restrained side plate [texte imprimé] / Bei Cheng, Auteur ; Ray Kai-Leung Su, Auteur . - 2011 . - pp. 503-512. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 4 (Avril 2011) . - pp. 503-512 Mots-clés : Deep  coupling  beams  Plate  buckling  Restrained  Seismic  retrofitting  Steel  plate Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The existing designs for deep reinforced-concrete (RC) coupling beams with low shear-span ratios and conventionally reinforced shear stirrups tend to fail in a brittle way with limited ductility and deformability under reversed cyclic loading. This paper aims to develop a new retrofitting method for existing deep RC coupling beams that can enhance the deformability and energy dissipation while maintaining flexural stiffness, improving the beams’ performance during an earthquake. Experiments were conducted to test four half-scale deep RC coupling beams with the same geometry and reinforcement layout but with different retrofitting schemes. One beam was tested without retrofitting to act as a control, whereas the others were retrofitted by a bolted steel plate with or without adding a buckling restraining device. This study reveals that the deformation and energy dissipation of the deep RC coupling beams retrofitted with restrained steel plates improved while the flexural stiffness did not increase. Moreover, by using laterally restrained steel plates, the specimens had better postpeak behavior, a more ductile failure mode, and better rotation deformability. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i4/p503_s1?isAuthorized=no

Theoretical and experimental study of plate-strengthened concrete columns under eccentric compression loading / Lu Wang in Journal of structural engineering, Vol. 139 N° 3 (Mars 2013) 

Public ISBD [article]  in Journal of structural engineering > Vol. 139 N° 3 (Mars 2013) . - pp. 350–359 Titre : Theoretical and experimental study of plate-strengthened concrete columns under eccentric compression loading Type de document : texte imprimé Auteurs : Lu Wang, Auteur ; Ray Kai-Leung Su, Auteur Année de publication : 2013 Article en page(s) : pp. 350–359 Note générale : structural engineering Langues : Anglais (eng) Mots-clés : reinforced  concrete  columns;  precambered  steel  plates;  strengthening;  eccentric  compression  loading Résumé : Steel jacketing has been widely used for strengthening RC columns in the last four decades. In practice, the RC columns to be strengthened are usually subjected to eccentric precompressed axial loads. Until now, there have been only limited studies conducted that address the stress-lagging effects between the original column and the new jacket due to the preexisting load. In this paper, the precambered steel plate–strengthening approach, which can alleviate the stress-lagging effects, was adopted to improve the axial strength and moment capacity of the preloaded RC columns subjected to eccentric compression loading. An experimental study that involved eight specimens with different eccentricities, plate thicknesses, and initial precamber displacements was conducted to examine the ductility and moment-curvature response of strengthened columns and to validate the effectiveness of this approach. A theoretical model was developed to predict the axial load capacity of the plate-strengthened columns. A comparison of the theoretical and experimental results showed that the theoretical model accurately predicted the axial load-carrying capacities of the plate-strengthened columns under eccentric compression loading. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000659 [article] Theoretical and experimental study of plate-strengthened concrete columns under eccentric compression loading [texte imprimé] / Lu Wang, Auteur ; Ray Kai-Leung Su, Auteur . - 2013 . - pp. 350–359. structural engineering Langues : Anglais (eng) in Journal of structural engineering > Vol. 139 N° 3 (Mars 2013) . - pp. 350–359 Mots-clés : reinforced  concrete  columns;  precambered  steel  plates;  strengthening;  eccentric  compression  loading Résumé : Steel jacketing has been widely used for strengthening RC columns in the last four decades. In practice, the RC columns to be strengthened are usually subjected to eccentric precompressed axial loads. Until now, there have been only limited studies conducted that address the stress-lagging effects between the original column and the new jacket due to the preexisting load. In this paper, the precambered steel plate–strengthening approach, which can alleviate the stress-lagging effects, was adopted to improve the axial strength and moment capacity of the preloaded RC columns subjected to eccentric compression loading. An experimental study that involved eight specimens with different eccentricities, plate thicknesses, and initial precamber displacements was conducted to examine the ductility and moment-curvature response of strengthened columns and to validate the effectiveness of this approach. A theoretical model was developed to predict the axial load capacity of the plate-strengthened columns. A comparison of the theoretical and experimental results showed that the theoretical model accurately predicted the axial load-carrying capacities of the plate-strengthened columns under eccentric compression loading. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000659