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Experimental evaluation of thin composite floor assemblies under fire loading / Emily I. Wellman in Journal of structural engineering, Vol. 137 N° 9 (Septembre 2011) 

Public ISBD [article]  in Journal of structural engineering > Vol. 137 N° 9 (Septembre 2011) . - pp. 1002-1016 Titre : Experimental evaluation of thin composite floor assemblies under fire loading Type de document : texte imprimé Auteurs : Emily I. Wellman, Auteur ; Amit H. Varma, Auteur ; Rustin Fike, Auteur Année de publication : 2011 Article en page(s) : pp. 1002-1016 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Floor  Fire  Composite  Connection  Fire  protection  Slab,  Failure  Composite  beam  Bolt Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents the behavior observations, results, and findings from experimental investigations of the structural behavior of thin composite floor systems subjected to combined gravity loads and fire loading. The 3.96×4.57  m floor systems consisted of A992 steel W10×15 interior beams and W12×16 girders acting composite with a 38.1-mm-deep ribbed steel deck with 63.5 mm of lightweight concrete on top. Three composite floor-assembly specimens were tested with two different shear connection types (welded-bolted shear tab and all-bolted double-angle connection), two different fire scenarios (realistic fires with standard heating and uncontrolled or controlled cooling paths), and two different fire protection scenarios (i.e., interior beams with or without fire protection). The experimental results indicate that removal of fireproofing from the interior beams causes them to heat, deflect, and fail more rapidly. The beams and girders have similar deflection-versus-temperature behaviors irrespective of the fireproofing on the interior beams. The thin lightweight composite slab used in these tests contributes significantly to the load transfer from the interior beams to the girders, but it does not seem to be able to support the interior beams once they started failing. Removing the fire protection from the interior beams of thin lightweight composite slabs such as those tested in this paper is not recommended, unless better behavior can be demonstrated through future tests that include effects of neighboring floor systems. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i9/p1002_s1?bypassSSO=1 [article] Experimental evaluation of thin composite floor assemblies under fire loading [texte imprimé] / Emily I. Wellman, Auteur ; Amit H. Varma, Auteur ; Rustin Fike, Auteur . - 2011 . - pp. 1002-1016. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 9 (Septembre 2011) . - pp. 1002-1016 Mots-clés : Floor  Fire  Composite  Connection  Fire  protection  Slab,  Failure  Composite  beam  Bolt Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents the behavior observations, results, and findings from experimental investigations of the structural behavior of thin composite floor systems subjected to combined gravity loads and fire loading. The 3.96×4.57  m floor systems consisted of A992 steel W10×15 interior beams and W12×16 girders acting composite with a 38.1-mm-deep ribbed steel deck with 63.5 mm of lightweight concrete on top. Three composite floor-assembly specimens were tested with two different shear connection types (welded-bolted shear tab and all-bolted double-angle connection), two different fire scenarios (realistic fires with standard heating and uncontrolled or controlled cooling paths), and two different fire protection scenarios (i.e., interior beams with or without fire protection). The experimental results indicate that removal of fireproofing from the interior beams causes them to heat, deflect, and fail more rapidly. The beams and girders have similar deflection-versus-temperature behaviors irrespective of the fireproofing on the interior beams. The thin lightweight composite slab used in these tests contributes significantly to the load transfer from the interior beams to the girders, but it does not seem to be able to support the interior beams once they started failing. Removing the fire protection from the interior beams of thin lightweight composite slabs such as those tested in this paper is not recommended, unless better behavior can be demonstrated through future tests that include effects of neighboring floor systems. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i9/p1002_s1?bypassSSO=1

Fundamental behavior of steel beam-columns and columns under fire loading / Lisa Choe in Journal of structural engineering, Vol. 137 N° 9 (Septembre 2011) 

Public ISBD [article]  in Journal of structural engineering > Vol. 137 N° 9 (Septembre 2011) . - pp. 954-966 Titre : Fundamental behavior of steel beam-columns and columns under fire loading : experimental evaluation Type de document : texte imprimé Auteurs : Lisa Choe, Auteur ; Amit H. Varma, Auteur ; Anil Agarwal, Auteur Année de publication : 2011 Article en page(s) : pp. 954-966 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Fire  Elevated  temperatures  Steel  column  Steel  beam-column  Experiment  Design  Heat Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents the results of experimental investigations conducted to determine the fundamental behavior of steel members under fire loading. A total of eleven full-scale steel members were tested under combined thermal and structural loading. First, five A992 steel beam-columns (W10×68) were tested to determine their fundamental moment-curvature responses at elevated temperatures and different axial load levels. The experimental approach involved the use of radiant heating and control equipment to apply the thermal loading, and close-range photogrammetry combined with digital image processing techniques to measure the deformations (curvature) in the heated zone. Next, six A992 steel wide-flange (W8×35 and W14×53) columns were tested to determine their inelastic buckling behavior and axial load-displacement responses at elevated temperatures. A self-reacting test frame was designed to subject the column specimens to axial loading and heating. The thermal loading was applied by using the same type of radiant heating and control equipment as the beam-column specimens. The measured behaviors (and strengths) of the tested beam-column and columns specimens are presented and then compared with those obtained from detailed 3D finite-element analyses. The experimental investigations showed that the fundamental behavior and strength of steel members is governed mostly by the steel surface temperature, and the strength and stiffness of steel columns decreases significantly with increasing temperatures, particularly in the range from 500–600°C. The elevated temperature behavior of steel members can be predicted reasonably by using detailed 3D finite-element models. These verified models are recommended for conducting analytical parametric studies. The experimental approaches are recommended for evaluating the fire behavior of other structural members and loading conditions. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i9/p954_s1?bypassSSO=1 [article] Fundamental behavior of steel beam-columns and columns under fire loading : experimental evaluation [texte imprimé] / Lisa Choe, Auteur ; Amit H. Varma, Auteur ; Anil Agarwal, Auteur . - 2011 . - pp. 954-966. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 9 (Septembre 2011) . - pp. 954-966 Mots-clés : Fire  Elevated  temperatures  Steel  column  Steel  beam-column  Experiment  Design  Heat Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents the results of experimental investigations conducted to determine the fundamental behavior of steel members under fire loading. A total of eleven full-scale steel members were tested under combined thermal and structural loading. First, five A992 steel beam-columns (W10×68) were tested to determine their fundamental moment-curvature responses at elevated temperatures and different axial load levels. The experimental approach involved the use of radiant heating and control equipment to apply the thermal loading, and close-range photogrammetry combined with digital image processing techniques to measure the deformations (curvature) in the heated zone. Next, six A992 steel wide-flange (W8×35 and W14×53) columns were tested to determine their inelastic buckling behavior and axial load-displacement responses at elevated temperatures. A self-reacting test frame was designed to subject the column specimens to axial loading and heating. The thermal loading was applied by using the same type of radiant heating and control equipment as the beam-column specimens. The measured behaviors (and strengths) of the tested beam-column and columns specimens are presented and then compared with those obtained from detailed 3D finite-element analyses. The experimental investigations showed that the fundamental behavior and strength of steel members is governed mostly by the steel surface temperature, and the strength and stiffness of steel columns decreases significantly with increasing temperatures, particularly in the range from 500–600°C. The elevated temperature behavior of steel members can be predicted reasonably by using detailed 3D finite-element models. These verified models are recommended for conducting analytical parametric studies. The experimental approaches are recommended for evaluating the fire behavior of other structural members and loading conditions. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i9/p954_s1?bypassSSO=1