References of "Franssen, Jean-Marc"
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See detailSécurite incendie - Sécurité incendie et calcul de la résistance au feu des bâtiments en acier selon l'Eurocode 3
Cajot, Louis-Guy; Debruyckere, Rik; Franssen, Jean-Marc ULg

Book published by Infosteel (2012)

Ce livre traite, dans ses trois premiers chapitres, de la sécurité incendie et du calcul de la résistance au feu des structures de bâtiments en acier selon l'Eurocode 3. Le chapitre 1 définit les ... [more ▼]

Ce livre traite, dans ses trois premiers chapitres, de la sécurité incendie et du calcul de la résistance au feu des structures de bâtiments en acier selon l'Eurocode 3. Le chapitre 1 définit les objectifs de la sécurité incendie sur la base du déroulement d'un incendie et examine les mesures que le concepteur peut prendre afin de répondre aux exigences de sécurité incendie et aux exigences réglementaires. Le chapitre 2 traite du calcul de la résistance au feu de structures en acier pour ce qui concerne le critère de capacité portante. Un modèle de calcul simple est donné dans les Eurocodes pour les éléments tendus, les colonnes et les poutres soumises ou non au déversement. Pour le calcul des poutres intégrées, qu’elles soient protégées ou non, on peut utiliser un modèle de calcul avancé, mais une méthode alternative simple est décrite dans cet ouvrage. Le chapitre 3 traite de l'ingénierie de la sécurité incendie, une discipline relativement nouvelle qui utilise les modèles physiques pour décrire le déroulement d'un incendie et ses effets sur le bâtiment et ses occupants. On évoque quatre situations qui nécessitent l’utilisation de l'ingénierie de la sécurité incendie, à savoir: les feux localisés, les feux de compartiment (avec ou sans embrasement généralisé), le cas des structures en acier situées à l'extérieur du bâtiment et celui où l’on considère le comportement d’ensemble d’une ossature. Ce dernier cas est illustré par l’étude de l’effet membranaire d’un système de plancher. Enfin, le chapitre 4 contient treize tableaux de dimensionnement qui donnent directement certains paramètres de calcul comme la réduction de la limite d’élasticité efficace, celle du module d’élasticité de l’acier, le niveau de chargement en situation d’incendie, le facteur de massiveté des sections en I, la température atteinte dans l’acier après un certain temps (pour divers valeurs de ce facteur de massiveté) et la température critique des colonnes (en fonction de leur niveau de chargement et de leur élancement). [less ▲]

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See detailLarge-Scale Fire Test of Unprotected Cellular Beam Acting in Membrane Action
Vassart, Olivier; Bailey, C. G.; Hawes, M. et al

in Journal of Structural Fire Engineering (2011), 2(4), 259-268

This paper describes a full scale fire test performed the 27th of February 2010 on a composite floor for analysing the possibility of tensile membrane action to develop when the unprotected steel beams in ... [more ▼]

This paper describes a full scale fire test performed the 27th of February 2010 on a composite floor for analysing the possibility of tensile membrane action to develop when the unprotected steel beams in the central part of the floor are made of cellular beams. The natural fire was created by a wood crib fire load of 700 MJ/m2 and the 9 × 15 m floor survived the fire that peaked at 1000°C and lasted for 90 minutes. Blind predictions of the air temperature development by the software OZone and of the structural behaviour by the software SAFIR which proved quite satisfactory are also described. [less ▲]

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See detail300e conférence du C.E.R.E.S
Courard, Luc ULg; Dehousse, Nicolas ULg; Demonceau, Jean-François ULg et al

Book published by Centre d'Etudes, de Recherches et d'Essais Scientifiques du Génie Civil (2011)

Cette brochure comprend: le mot du président, un historique du CERES, la liste des bulletins, mémoires et conférences du CERES depuis ses origines jusqu'à ce jour, la liste des présidents, secrétaires et ... [more ▼]

Cette brochure comprend: le mot du président, un historique du CERES, la liste des bulletins, mémoires et conférences du CERES depuis ses origines jusqu'à ce jour, la liste des présidents, secrétaires et trésoriers, un mot de conclusions, ainsi que le programme de la manifestation organisée à l'occasion de la trois centième conférence du CERES. [less ▲]

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See detailLe mot du président
Franssen, Jean-Marc ULg

in Courard, Luc; Dehousse, Nicolas; Demonceau, Jean-François (Eds.) et al 300e conférence du C.E.R.E.S (2011)

On discute du rôle du CERES: essentiellement une fenêtre ouverte sur le monde pour nos chercheurs et nos étudiants, un moyen pour le département ArGEnCo de maintenir le contact avec le monde de l ... [more ▼]

On discute du rôle du CERES: essentiellement une fenêtre ouverte sur le monde pour nos chercheurs et nos étudiants, un moyen pour le département ArGEnCo de maintenir le contact avec le monde de l'entreprise. [less ▲]

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See detailNew features in SAFIR: Structural Fire Analysis of a Shell Roof Structure
Gernay, Thomas ULg; Franssen, Jean-Marc ULg

Scientific conference (2011, November 15)

The structural fire analysis of a roof structure made of two concrete shells has been performed with the software SAFIR.

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See detailNew features in SAFIR: Damage-Plastic Multiaxial Model for Concrete
Gernay, Thomas ULg; Franssen, Jean-Marc ULg

Scientific conference (2011, November 15)

The need for robust, reliable multiaxial constitutive relationships for concrete is a challenging issue in structural fire engineering. A new damage-plastic model has been developed to capture the ... [more ▼]

The need for robust, reliable multiaxial constitutive relationships for concrete is a challenging issue in structural fire engineering. A new damage-plastic model has been developed to capture the development of permanent strains and the degradation of elastic properties in concrete subjected to thermo-mechanical loading. This model has been implemented in the software SAFIR for using with SOLID finite elements (multiaxial model) and with SHELL finite elements (plane stress model). [less ▲]

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See detailNew features in SAFIR: Transient Creep in Eurocode Concrete Model
Gernay, Thomas ULg; Franssen, Jean-Marc ULg

Scientific conference (2011, November 15)

A new formulation of the Eurocode 2 concrete model at elevated temperature has been implemented in which the transient creep strain is treated by an explicit term in the strain decomposition. This new ... [more ▼]

A new formulation of the Eurocode 2 concrete model at elevated temperature has been implemented in which the transient creep strain is treated by an explicit term in the strain decomposition. This new model gives the same answer as the Eurocode model when the load and the temperature increase, but the new model is better than the Eurocode model at capturing the concrete behavior when the load or the temperature decrease owing to the explicit transient creep term. This new concrete model, called Explicit Transient Creep Eurocode model (ETC), has been implemented in the software SAFIR. [less ▲]

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See detailDevelopment of an FDS-SAFIR interface
Tondini, Nicola; Franssen, Jean-Marc ULg

Scientific conference (2011, November 15)

A weak coupling strategy from CFD models to F.E. models is being developed on the base of an interface file. The software FDS and SAFIR are used in the applications.

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See detailFull-scale fire test on a composite floor slab incorporating long span cellular steel beams
Nadjai, Ali; Bailey, Colin; Vassart, Olivier et al

in Structural Engineer (2011), 89(21), 18-25

As part of an international major research initiative, dealing with the behaviour of long span cellular beams in steel framed buildings under fire, a large-scale fire test incorporating 15m long cellular ... [more ▼]

As part of an international major research initiative, dealing with the behaviour of long span cellular beams in steel framed buildings under fire, a large-scale fire test incorporating 15m long cellular beams was carried out. The test incorporated unprotected secondary cellular steel beams acting compositely with the supporting floor slab. The floorplate in its entirety was designed to carry the load with unprotected beams, when subjected to a severe fire, by utilising membrane action of the floor slab. The overall structure performed very well supporting the full applied static load for the duration of the test. The unprotected cellular steel beams were subjected to distortional buckling, with only the top tee providing any support through catanary action. The test supported the assumptions adopted in the structural design approach and provided an accurate estimate of the strength of the floorplate. Comparison of the recorded time-temperature relationship of the fire with the design method presented in the Eurocodes shows that the code under-predicts the severity of the fire, although this was compensated to some extent by the conservative assumptions embedded within the structural model. [less ▲]

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See detailCollapse of concrete columns during and after the cooling phase of a fire
Dimia, Mohamed Salah; Guenfoud, Mohamed; Gernay, Thomas ULg et al

in Journal of Fire Protection Engineering (2011), 21(4), 245263

This paper presents a study performed on the collapse of reinforced concrete columns subjected to natural fire conditions during and after the cooling phase of the fire. The aim is, first, to highlight ... [more ▼]

This paper presents a study performed on the collapse of reinforced concrete columns subjected to natural fire conditions during and after the cooling phase of the fire. The aim is, first, to highlight the phenomenon of collapse of concrete columns during and after the cooling phase of a fire and then, to analyze the influence of some determinant parameters. The main mechanisms that lead to this type of failure are found to be the delayed increase of the temperature in the central zones of the element and the additional loss of concrete strength during the cooling phase of the fire. A parametric study is performed considering different fires and geometric properties of the column. This shows that the most critical situations with respect to delayed failure arise for short fires and for columns with low slenderness or massive sections. [less ▲]

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See detailFRACOF: Fire resistance assessment of partially protected steel-concrete composite floors
Zanon, Riccardo; Sommavilla, Mauro; Vassart, Olivier et al

in De Luca, Antonello (Ed.) XXIII Giornate italiane della costruzione in acciaio (2011, October 12)

Large scale fire tests and observations of actual building fires have shown that the fire performance of composite steel framed buildings is much better than is indicated by fire resistance tests on ... [more ▼]

Large scale fire tests and observations of actual building fires have shown that the fire performance of composite steel framed buildings is much better than is indicated by fire resistance tests on isolated elements. This contribution presents application of a simple design method, so-called FRACOF concept, for the analysis of non sway steel framed buildings with composite floors. Starting point were the outstanding results obtained in the BRE Cardington large scale building fire test programme carried out during 1995 and 1996. The method was further validated by large-scale standard furnace tests in 2008 and 2009, as well as with natural fire tests in 2010. A recent test has also shown the possibility of application of this concept to composite floors with castellated beams. The recommendations are in line with the reliability level imposed by current design rules and are limited to structures similar to that tested. The method permits designers to spare the fire protection for the framing elements for which it is not needed by keeping the same safety requirement than traditional codes. [less ▲]

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See detailDevelopmednt of an integrated modelling methodology for compartment fires by implementing a weak coupling strategy between a CFD and an FE software
Tondini, Nicola; Franssen, Jean-Marc ULg

in De Luca, Antonello (Ed.) XXIII giornate italiane della costruzione in acciaio (2011, October 12)

This article presents the assumptions and the issues that arise when developing an integrated modelling methodology between a Computational Fluid Dynamics (CFD) software applied to compartment fires and a ... [more ▼]

This article presents the assumptions and the issues that arise when developing an integrated modelling methodology between a Computational Fluid Dynamics (CFD) software applied to compartment fires and a finite element (FE) software applied to structural systems. In particular, a weak coupling methodology use to simulate a fire exposed structure by modelling the fire development in the compartment, the heat penetration in the structure and the mechanical response is described. The advantages and the disadvantages of such a technique are highlighted compared to a full coupling that conversely takes into account all mutual interactions. This methodology is particularly suitable for relatively thin steel structures in large compartments. Moreover, the need of a standardised transfer file in order to get the methodology as flexible as possible in term of versatility is emphasized. [less ▲]

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See detailRapport de recherche (SPF Intérieur 2011) : Facteur m
Dumont, Fabien ULg; Franssen, Jean-Marc ULg; Wellens, Eric ULg

Report (2011)

Les nouveaux bâtiments industriels doivent répondre aux prescriptions de l'Annexe 6 de l'Arrêté Royal du 7 juillet 1994 fixant les Normes de Base en matière de prévention contre l'incendie auxquelles les ... [more ▼]

Les nouveaux bâtiments industriels doivent répondre aux prescriptions de l'Annexe 6 de l'Arrêté Royal du 7 juillet 1994 fixant les Normes de Base en matière de prévention contre l'incendie auxquelles les bâtiments nouveaux doivent satisfaire. Cette réglementation stipule que les bâtiments industriels sont classés en fonction de la charge calorifique caractéristique, laquelle est la charge calorifique totale par unité de surface au sol corrigée par un facteur de combustion m, d'une valeur comprise entre zéro et un, qui tient compte de la combustion totale ou partielle des matériaux. La norme NBN EN 1991-1-2:2003 (Eurocode 1) indique que le facteur de combustion est égal à 0,8 dans le cas de matériaux principalement cellulosiques, mais cette norme ne donne pas de directives concernant la valeur de m pour les autres matériaux. La présente recherche a pour objet la détermination expérimentale du coefficient de combustion m de 6 marchandises courantes. [less ▲]

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See detailFire tests made for the ATTEL RFCS research project
Franssen, Jean-Marc ULg; Dumont, Fabien ULg; Wellens, Eric ULg et al

Conference given outside the academic context (2011)

The ATTEL project (Performance-Based approaches for high strength tubular columns and connections during earthquake and fire loadings) aims at developing performance-based design approaches where the ... [more ▼]

The ATTEL project (Performance-Based approaches for high strength tubular columns and connections during earthquake and fire loadings) aims at developing performance-based design approaches where the capacity design of steel grades up to S690 and S700MC – widely used in seismic engineering to avoid brittle failure and ensure ductile behaviour – will be extended to high strength steel circular hollow section structures to prevent failure and collapse under both earthquake and fire loading. Within this research projects, fire resistance tests have been performed on 4 columns, 4 beam-to-column joints and 3 column bases. The main features and results of these tests are presented here. [less ▲]

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See detailSimplified Fire Design for Slim Floor Beams
Zaharia, Raul; Duma, Diana Maria ULg; Vassart, Olivier et al

in Dunai, Laszlo (Ed.) Proceedings of the 6th European Conference on Steel and Composite Structures (2011, September 02)

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See detailExperimental Tests and Analytical Models for Welds and Grade 8.8 Bolts under Heating and Subsequent Cooling
Hanus, François; Zilli, Giuliana; Franssen, Jean-Marc ULg

in Journal of Structural Fire Engineering (2011), 2(3), 181-194

The present article describes experimental tests performed on bolts and welds at the Centro Sviluppo Materiali under heating and subsequent cooling. Force-displacement laws, calibrated on these tests, are ... [more ▼]

The present article describes experimental tests performed on bolts and welds at the Centro Sviluppo Materiali under heating and subsequent cooling. Force-displacement laws, calibrated on these tests, are proposed afterwards for bolts in tension, bolts in shear and butt welds in shear during a natural fire. These laws can be integrated into models representing the global behaviour of steel and composite joints, based on the Component Method. [less ▲]

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See detailSAFIR Materials Manual - SILCON_ETC, CALCON_ETC
Gernay, Thomas ULg; Franssen, Jean-Marc ULg

Report (2011)

This document describes the material constitutive models SILCON_ETC and CALCON_ETC, which are uniaxial material models implemented in the software SAFIR (from version 2011.b.0). The material models SILCON ... [more ▼]

This document describes the material constitutive models SILCON_ETC and CALCON_ETC, which are uniaxial material models implemented in the software SAFIR (from version 2011.b.0). The material models SILCON_ETC and CALCON_ETC are based on the Explicit Transient Creep Eurocode constitutive model (ETC model) for concrete at elevated temperature, which has been developed at University of Liege by the authors of this document. [less ▲]

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See detailModelo de componentes para análise de ligações de madeira com ligadores metálicos
Cachim, Paulo; Franssen, Jean-Marc ULg

Conference (2011, June 07)

Connections are key elements in any structure because the knowledge of their behaviour is fundamental to an appropriate structural modelling since this behaviour can influence the distribution of efforts ... [more ▼]

Connections are key elements in any structure because the knowledge of their behaviour is fundamental to an appropriate structural modelling since this behaviour can influence the distribution of efforts in different structural elements. In the particular case of wood structures, connections are usually considered as completely rigid or hinged, but their actual behaviour is intermediate between these two extreme limits, depending on the geometry of the connection and the type of connector used. For the design of these connections, the methodology proposed by Eurocode 5 is based on plastic limit analysis which allows the determination of load strength of the connection but not the determination of its stiffness. For the determination of stiffness, Eurocode 5 presents just a very simple expression that depends only on the density of the wood and the diameter of connector to characterize the force-displacement behaviour, disregarding for this purpose the geometry of the connection or the angle of force in relation to the grain. The objective of this paper is to present a component model that allows the characterization of the behaviour of dowel type connections. The results obtained with the model were calibrated with experimental results obtained in the litterature. [less ▲]

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See detailSimplified method for the temperature distribution in slim floor beams
Zaharia, Raul; Duma, Diana Maria ULg; Vassart, Olivier et al

in Wald, F.; Horova, K.; Jirku, J. (Eds.) Proceedings of International Conference Applications of Structural Fire Engineering (2011, April 29)

From extensive numerical thermal simulations made with SAFIR, simple design equations have been derived that allow calculating the temperature in slim floor sections subjected to an ISO 834 fire.

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