References of "Franssen, Jean-Marc"
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See detailCours de prévention incendie
Franssen, Jean-Marc ULg

Learning material (2010)

Generalities Legislation Reaction to fire Fire resistance - tests Material properties in case of fire Fire resistance of load bearing structures Fire resistance of compartmentation

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See detailAuto. & RoB. Extension Hall 5 + Bureau. Avis sur la conformité à l'Annexe 6 des normes de Base.
Franssen, Jean-Marc ULg

Report (2010)

The plans of an extension to be build to an industrial building have been examined in order to verify that the extensioncomplies with the recommendations contained in Annex 6 "Industrial buildings" of the ... [more ▼]

The plans of an extension to be build to an industrial building have been examined in order to verify that the extensioncomplies with the recommendations contained in Annex 6 "Industrial buildings" of the Belgian Basis Norms. [less ▲]

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See detailSimulation of a window frame exposed to fire
Franssen, Jean-Marc ULg; Alonso, Alain

Report (2010)

The temperature distribution is evaluated in the section of a window frame and the structural behaviour of the frame is then evaluated in the fire situation

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See detailSome theoretical and practical aspects about CFD-FE coupling for structures subjected to fire
Franssen, Jean-Marc ULg

Scientific conference (2010, August 05)

Four Powerpoint presentations present: 1) The main aspects of the structural software SAFIR developped for the simulation of the bahaviour of structures subjected to fire. 2) The main aspects of the CFD ... [more ▼]

Four Powerpoint presentations present: 1) The main aspects of the structural software SAFIR developped for the simulation of the bahaviour of structures subjected to fire. 2) The main aspects of the CFD sofware FDS developped for the analysis of compartment fires. 3) some theoretical and practical aspects to be considered when these two software have to be coupled. 4) one particluar way of organising a one way coupling from any CFD to any FE software. [less ▲]

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See detailFICEB W.P.6 final report: Numerical simulations of the large scale fire test
Gernay, Thomas ULg; Franssen, Jean-Marc ULg

Report (2010)

This report presents the results of the numerical simulations performed by University of Liege in the framework of work package 6 of the FICEB project financed by the Research Fund for Coal and Steel. A ... [more ▼]

This report presents the results of the numerical simulations performed by University of Liege in the framework of work package 6 of the FICEB project financed by the Research Fund for Coal and Steel. A full scale fire test was performed in Ulster on February 27th 2010 on a composite floor for analysing the behaviour of long cellular steel beams in a complete compartment office in building structure under realistic fire conditions. The aim was to study 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. Predictive numerical simulations of the test have been performed with the software SAFIR in order to define the appropriate structure to be used for the full scale fire test. As predicted, the structure was able to withstand the test without collapse. After the test, the results of the predictive simulations have been compared to the measured results, showing relatively good agreement. [less ▲]

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See detailPropagation de fumées
Dumont, Fabien ULg; Alonso, Alain; Franssen, Jean-Marc ULg

Report (2010)

The aim of the project is to see whether it makes a difference in term of propagation of smoke to compartments outside the fire compartment, whether "normal" fire resistant doors are provided or whether ... [more ▼]

The aim of the project is to see whether it makes a difference in term of propagation of smoke to compartments outside the fire compartment, whether "normal" fire resistant doors are provided or whether doors with particular properties related to smoke propagation (Sa or Sm) are provided. Two types of building have been considered: one of horizontal shape (representative of a hotel or a hospital floor) and one of vertical shape (representative of a dxellings building). Different scenario have been considered with respect to the type of doors, the fact that different doors or windons are open or not, the presence of wind... Observed results in different compartment are the thickness of the smoke free layer, the temperature of the smoke layer, the obscurtion or the CO content. [less ▲]

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See detailPreliminary Research Study on the Fire Resistance of Stainless Steel-Reinforced Concrete members
Gernay, Thomas ULg; alonso, Alain; Franssen, Jean-Marc ULg

Report (2010)

In this project, it is examined whether and under which conditions the good resistance to high temperature of stainless steel bars can lead to better fire resistance when used in reinforced concrete ... [more ▼]

In this project, it is examined whether and under which conditions the good resistance to high temperature of stainless steel bars can lead to better fire resistance when used in reinforced concrete columns, beams and slabs working in tensile membrane action. [less ▲]

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Peer Reviewed
See detailExperimental investigations and analytical models for behavior of Grade 8.8 bolts and butt welds under heating and subsequent cooling
Hanus, François ULg; Zilli, Giuliana; Franssen, Jean-Marc ULg

in kodur, venkatesh; Franssen, Jean-Marc (Eds.) Structures in Fire - Proceedings of the Sixth International Conference (2010, June 03)

The present article describes the experimental tests undertaken on Grade 8.8 tests and butt welds at the Centro Sviluppo Materiali during heating or subsequent cooling, presents a model for the force ... [more ▼]

The present article describes the experimental tests undertaken on Grade 8.8 tests and butt welds at the Centro Sviluppo Materiali during heating or subsequent cooling, presents a model for the force-displacement diagram of bolts during a natural fire that integrates the influence of the temperature history, and gives values of strength reduction factors for the cooling phase [less ▲]

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See detailModélisation multi physique du comportement au feu des colonnes en béton arme
Benmehidi, Nadia; Franssen, Jean-Marc ULg; Guenfoud, Mohamed

Scientific conference (2010, June)

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Peer Reviewed
See detailConsideration of Transient Creep in the Eurocode Constitutive Model for Concrete in the Fire situation
Gernay, Thomas ULg; Franssen, Jean-Marc ULg

in Kodur, Venkatesh; Franssen, Jean-Marc (Eds.) Proceedings of the Sixth International Conference Structures in Fire (2010, June)

This paper presents a new formulation of the generic Eurocode 2 concrete model that contains an explicit term for consideration of the transient creep. The simplicity and generic characteristics of the ... [more ▼]

This paper presents a new formulation of the generic Eurocode 2 concrete model that contains an explicit term for consideration of the transient creep. The simplicity and generic characteristics of the Eurocode model are preserved and the new explicit formulation is calibrated to give the same results as the implicit formulation that is proposed in the Eurocode when the material is heated under constant load. However, the improvements allow taking into account with more accuracy the phenomenon of transient creep in concrete under more complex situations such as, for example, the cooling phase of a fire. The differences between the two formulations are highlighted for a simple structure. A comparison is given between experimental and calculated results on a centrally loaded concrete column submitted to heating-cooling sequence. [less ▲]

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See detailNumerical modelling of membrane action of composite slabs in fire situation
Vulcu, Cristian; Gernay, Thomas ULg; Zaharia, Raul et al

in Kodur, Venkatesh; Franssen, Jean-Marc (Eds.) Proceedings of the Sixth International Conference Structures in Fire (2010, June)

Membrane action in fire is now an intensively researched area, for which more improvement is always necessary. The paper presents some numerical simulations, done with the SAFIR program, in order to ... [more ▼]

Membrane action in fire is now an intensively researched area, for which more improvement is always necessary. The paper presents some numerical simulations, done with the SAFIR program, in order to derive more simple models for representing the partially protected composite floors in fire situation. The numerical models are calibrated using the results of three full scale tests that have been performed in recent years. [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 Franssen, Jean-Marc; Kodur, Venkatesh (Eds.) Proceedings of the Sixth International Conference Structures in Fire (2010, June)

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

This paper describes a full scale fire test performed recently 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 x 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 detailConcept of structural fire safety for bridges K05 and K01
Franssen, Jean-Marc ULg

Report (2010)

The fire scenario as well as the extent of fire protection to apply to these two bridge structures are investigated.

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See detailMaison Josten à Mürringen
Franssen, Jean-Marc ULg; Dupont, Jean-Pierre

Report (2010)

Analyse d'une dalle dans une ferme après incendie afin de déterminer si l'incendie a affaibli la capacité bportante de la dalle.

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See detailEvaluation of Structural Fire Performance. Today and Tomorrow
Franssen, Jean-Marc ULg; Gernay, Thomas ULg; Hanus, François ULg et al

Conference given outside the academic context (2010)

The most recent applications in evaluation of structural fire performance performed at the University of Liege are described. Five topics are discussed: analysis of 3D structures, joints in steel ... [more ▼]

The most recent applications in evaluation of structural fire performance performed at the University of Liege are described. Five topics are discussed: analysis of 3D structures, joints in steel structures, spalling in concrete structures, cellular beams and tensile membrane action. [less ▲]

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See detailAxially Loaded Stainless Steel Columns in Case of Fire
Lopes, Nuno; Vila Real, Paulo; Simões da Silva, Luís et al

in Journal of Structural Fire Engineering [=JSFE] (2010), 1(1), 43-59

The simple model of Eurocode 3, for the fire resistance evaluation of stainless steel members, are based on the procedures used for carbon steel structural elements. However, due to the existing ... [more ▼]

The simple model of Eurocode 3, for the fire resistance evaluation of stainless steel members, are based on the procedures used for carbon steel structural elements. However, due to the existing differences in the constitutive laws of these two materials, it is expected that it would not be possible to use, in both materials, the same formulae for the member stability calculation, as proposed in Eurocode 3. This paper aims at increasing the knowledge on the behaviour of stainless steel axially loaded columns at elevated temperatures. For this purpose, a geometrical and material non linear computer code has been used to determine the buckling load of these elements. The Eurocode formulae are evaluated and a new proposal, that ensures accurate and conservative results when compared with the numerical simulations, is presented. [less ▲]

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See detailEvaluation de la capacité portante d'une structure en béton ayant subi un incendie
Franssen, Jean-Marc ULg

Learning material (2010)

What are the different missions that can be given to an expert about the assessment of the load bearing capacity of a concrete structure that has been subjected to a fire? How can he accomplish these ... [more ▼]

What are the different missions that can be given to an expert about the assessment of the load bearing capacity of a concrete structure that has been subjected to a fire? How can he accomplish these missions. [less ▲]

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See detailExpertise maison de Groote
Franssen, Jean-Marc ULg

Report (2010)

Estimation des effets d'un incendie sur la capacité portante de la structure en béton

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Peer Reviewed
See detailNumerical Modelling of Thin-Walled Stainless Steel Structural Elements in Case of Fire
Lopes, Nuno; Vila Real, Paulo; Simoes da Silva, Luís et al

in Fire Technology (2010), 46(1), 91-108

In this paper, the structural response of stainless steel thin-walled elements submitted to fire is analysed numerically by means of the geometrically and materially non-linear Finite Element program ... [more ▼]

In this paper, the structural response of stainless steel thin-walled elements submitted to fire is analysed numerically by means of the geometrically and materially non-linear Finite Element program SAFIR, including imperfections. In order to make these simulations, two main changes in the program were made: (i) the code was changed in order to deal with the stainless steel 2D material constitutive law to be used with shell elements and (ii) the possibility of the program to take into account residual stresses with shell finite elements was introduced. The stainless steel stress–strain relationship at high temperatures was based on the one presented in part 1.2 of Eurocode 3. To model the strain hardening exhibited by the stainless steels, using the shell element formulation, an approximation to the Eurocode 3 constitutive law was needed. Local and global geometrical imperfections were considered in the simulations. The paper shows the influence of the residual stresses on the ultimate load-carrying capacity of thin-walled stainless steel structural elements in case of fire. [less ▲]

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See detailDistribution of temperature in steel and composite beams and joints under natural fire
Hanus, François; Franssen, Jean-Marc ULg

in Cahier Scientifique - Revue Technique Luxembourgeoise (2010), 2

The present article describes the existing methods and recommendations for the evaluation of temperature profiles in steel beams and joints covered by a concrete slab. Then, modifications and improvements ... [more ▼]

The present article describes the existing methods and recommendations for the evaluation of temperature profiles in steel beams and joints covered by a concrete slab. Then, modifications and improvements to the existing methods are proposed in order to predict more accurately temperatures at the level of the top flange of the beam by accounting for heat fluxes between the steel elements and the concrete slab. The two methods presented in this article differ by the degree of simplicity, the field of applicability and the accuracy of the predicted results. Comparisons with numerical simulations performed in the finite element program SAFIR have been described for the validation of these new methods. It is assumed in these numerical models that the contact between the steel profile and the concrete slab is perfect. The “original” Lumped Capacity Method gives globally good predictions of temperature in steel and composite beams and joints but does not integrate heat fl uxes between the steel elements and the concrete slab. This leads to an over-estimation of temperature in the steel elements during the heating phase and to an under-estimation of temperature during the cooling phase. In order to take these fluxes into consideration in the evaluation of the top flange temperature, it is suggested in the first proposed method to integrate a part of the concrete slab into the heated surface or volume considered in the Lumped Capacitance Method. The Composite Section Method correctly predicts temperature at the level of the top flange under ISO fire or during the heating phase of parametrical fire curves but a delay is observed between these analytical results and those obtained from numerical simulations performed in SAFIR software. In a second method, called Heat Exchange Method, it is proposed to calculate separately the heat fluxes between, on one side, the top flange and, on the other side, the gases of the compartment, the rest of the steel section and the concrete slab. The temperatures given by this latter method are in very good agreement with those obtained from FE models. The use of this method is really less fastidious than the use of FE models, especially for joints, but is limited to a certain type of fire curves (parametrical fire curves defined in the Annex A of the EN 1991-1-2). Finally, a bilinear temperature profi le has been proposed to interpolate the analytically-calculated temperatures at the level of the top and bottom flanges on the total height. This procedure is simple and shows a good agreement with the numerical results in 2-D beam sections and 3-D joint zones during the heating and cooling phases of parametric fire curves. [less ▲]

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