Fire design of timber-concrete composite slabs with screwed connections / Andrea Frangi in Journal of structural engineering, Vol. 136 N° 2 (Fevrier 2010)  

Public ISBD [article]  inJournal of structural engineering > Vol. 136 N° 2 (Fevrier 2010) . - pp. 219-228 Titre : Fire design of timber-concrete composite slabs with screwed connections Type de document : texte imprimé Auteurs : Andrea Frangi, Auteur ; Markus Knobloch, Auteur ; Mario Fontana, Auteur Année de publication : 2011 Article en page(s) : pp. 219-228 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Timber Composite slab Shear connection Fire Charring model rate tests ISO-fire exposure Design Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The structural behavior of timber-concrete composite slabs is mainly governed by the shear connection between timber and concrete. When a timber-concrete composite structure is exposed to fire, it is of particular importance to know the changes in stiffness and strength that the shear connection is subjected to. For the calculation of the fire resistance of timber-concrete composite slabs a simplified design method was developed on the basis of the calculation model for mechanically jointed beams with flexible elastic connection given in EN 1995-1-1 and the reduced cross section method given in EN 1995-1-2. The effects of temperature on the mechanical properties of timber, concrete, and connection are taken into account by modification factors kmod,fi. For the strength and stiffness properties of the screwed connections simplified formulae for the calculation of the modification factors kmod,fi were developed, based on the results of an extensive experimental study on the fire behavior of the screwed connections. The modification factors kmod,fi were expressed as a function of the side cover of the connections. In this way the temperature in the timber member does not need to be determined, making the calculation of the strength and stiffness properties of the screwed connection in fire much easier for the designer. The paper first describes and discusses the behavior and modeling of the screwed connection in fire, and then the simplified design method developed for the calculation of the fire resistance of timber-concrete composite slabs with screwed connections is presented. Finally, the result of the calculation method is compared to the result of a full-scale fire test. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i2/p219_s1?isAuthorized=no [article] Fire design of timber-concrete composite slabs with screwed connections [texte imprimé] / Andrea Frangi, Auteur ; Markus Knobloch, Auteur ; Mario Fontana, Auteur . - 2011 . - pp. 219-228. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 2 (Fevrier 2010) . - pp. 219-228 Mots-clés : Timber Composite slab Shear connection Fire Charring model rate tests ISO-fire exposure Design Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The structural behavior of timber-concrete composite slabs is mainly governed by the shear connection between timber and concrete. When a timber-concrete composite structure is exposed to fire, it is of particular importance to know the changes in stiffness and strength that the shear connection is subjected to. For the calculation of the fire resistance of timber-concrete composite slabs a simplified design method was developed on the basis of the calculation model for mechanically jointed beams with flexible elastic connection given in EN 1995-1-1 and the reduced cross section method given in EN 1995-1-2. The effects of temperature on the mechanical properties of timber, concrete, and connection are taken into account by modification factors kmod,fi. For the strength and stiffness properties of the screwed connections simplified formulae for the calculation of the modification factors kmod,fi were developed, based on the results of an extensive experimental study on the fire behavior of the screwed connections. The modification factors kmod,fi were expressed as a function of the side cover of the connections. In this way the temperature in the timber member does not need to be determined, making the calculation of the strength and stiffness properties of the screwed connection in fire much easier for the designer. The paper first describes and discusses the behavior and modeling of the screwed connection in fire, and then the simplified design method developed for the calculation of the fire resistance of timber-concrete composite slabs with screwed connections is presented. Finally, the result of the calculation method is compared to the result of a full-scale fire test. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i2/p219_s1?isAuthorized=no

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