References of "Franssen, Jean-Marc"
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See detailEconomic analysis of Stainless Steel- Reinforced Concrete members designed for a Fire Resistance of 2 hours
Gernay, Thomas ULg; Franssen, Jean-Marc ULg

Report (2011)

While Stainless steel is used primarily for its corrosion resistance, there is a growing interest in other properties, such as mechanical, high temperature resistance, aesthetics and others. The ... [more ▼]

While Stainless steel is used primarily for its corrosion resistance, there is a growing interest in other properties, such as mechanical, high temperature resistance, aesthetics and others. The properties at high temperatures (400 – 650°C ) of stainless steels are known and put to use in a number of applications such as steam turbines and equipment for the chemical industry. Some research on the fire resistance of stainless steels has been carried out for welded I beams and for concrete-filled tubes, with positive results. However, there are no published results on the behavior of concrete reinforced with stainless steel rebar. In a preliminary research program conducted by the University of Liege for ISSF, a preliminary assessment of the performance of stainless steel reinforced concrete has been carried out, using computer simulation methods. This preliminary study has shown that stainless steel reinforced concrete members can behave better than carbon steel reinforced concrete members in fire situation. However, an economic analysis is still needed to determine whether stainless steel reinforcement can be interesting for practical applications. This report is divided in two parts. The first part presents the assumptions and the results of the numerical simulations performed by University of Liege. The numerical simulations aim to design stainless and carbon steel -reinforced concrete members satisfying to a fire resistance of 2 hours (Standard fire conditions). The two structural members considered in this study are a reinforced concrete beam and a composite slab (with the so-called « membrane » behavior). The numerical simulations are performed with the SAFIR 20011.a.3 software developed in University of Liege. The second part presents the assumptions and the results of the economic analysis of the structural members designed in the first part. The stainless and carbon steel –reinforced solutions for a fire resistance of 2 hours are compared on an economic basis. [less ▲]

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See detailModélisation multiphysique du comportement au feu des colonnes en béton armé
Otmani-Benmehidi, Nadia; Guenfoud, Mohamed; Fellah, Farid et al

Conference (2011, March 15)

Cet article est consacré à la modélisation numérique non linéaire des colonnes en béton armé soumises à un incendie. Dans ce travail nous analysons des colonnes en béton armé chargées par des efforts de ... [more ▼]

Cet article est consacré à la modélisation numérique non linéaire des colonnes en béton armé soumises à un incendie. Dans ce travail nous analysons des colonnes en béton armé chargées par des efforts de compression excentrés et soumises à un feu normalisé. Du fait que les poteaux ont un rôle extrêmement important dans une construction, la vérification de leur résistance au feu dans les conditions d’incendie est cruciale. L’analyse se divise en deux étapes. Dans la première étape nous procédons à l’étude thermique des colonnes. Nous en déduisons les températures en fonction du temps que nous utilisons dans la deuxième étape pour l’étude mécanique. Lors de cette dernière nous obtenons les variations de différents paramètres tels que le moment fléchissant, les contraintes, les déplacements et le module tangent [less ▲]

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See detailDéveloppement d'un modèle constitutif multiaxial de béton
Gernay, Thomas ULg; Millard, Alain; Franssen, Jean-Marc ULg

Scientific conference (2011, March 03)

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See detailFire resistance of long span cellular beam made of rolled profiles
Vassart, Olivier; Hawes, Mike; Simms, Ian et al

Report (2011)

The aim of this document is to describe the calculation methods developed to assess the resistance of simply supported cellular beams in fire conditions. This development has been made in the scope of the ... [more ▼]

The aim of this document is to describe the calculation methods developed to assess the resistance of simply supported cellular beams in fire conditions. This development has been made in the scope of the RFCS FiCEB+ [23] and in the scope of the PHD of O.Vassart [24]. This calculation procedure has been introduced in the ACB+ software available on www.arcelormittal.com/sections [23] RFS2-CT-2007-00042 : FICEB+ - Fire resistance of long span cellular beam made of rolled profiles ; March 2011 [24] O. Vassart, Analytical model for cellular beams made of hot rolled sections in case of fire, PhD Thesis, Université Blaise Pascal Clermont-Ferrand II, 2009 [less ▲]

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See detailA Comparison Between Explicit and Implicit Modelling of Transient Creep Strain in Concrete Uniaxial Constitutive Relationships
Gernay, Thomas ULg; Franssen, Jean-Marc ULg

in Proceedings of the Fire and Materials 2011 Conference (2011, February)

Transient creep strain has to be included within the constitutive relationships for concrete at high temperatures. However, the necessity of taking into account this term explicitly is not clearly defined ... [more ▼]

Transient creep strain has to be included within the constitutive relationships for concrete at high temperatures. However, the necessity of taking into account this term explicitly is not clearly defined. In the Eurocode 2 uniaxial concrete material model, transient creep is included implicitly. This paper aims to highlight the capabilities and limitations of concrete uniaxial models at elevated temperatures for thermo-mechanical behaviour modelling, depending on the implicit or explicit consideration of transient creep strain in the model. The characteristics inherent to the two types of models are described and compared. It appears that one of the major limitations of implicit models concerns the unloading stiffness because implicit models treat transient creep as reversible. Based on numerical analysis performed on loaded concrete columns subjected to natural fire, it is shown that the stress-temperature paths experienced by structural concrete are varied and complicated and that concrete material models cannot handle properly these complex situations of unsteady temperatures and stresses without explicit consideration of transient creep. The paper proposes a new formulation of the Eurocode 2 concrete material model that contains an explicit term for transient creep. The new model is implemented in the software SAFIR and validated against experimental data of the mechanical strain developed by concrete cylinders under different unsteady temperatures and loads. It is shown that the actual material behaviour is better matched with the new explicit model than with the current implicit Eurocode 2 model. Finally, a comparison is given between experimental and calculated results on an axially restrained concrete column subjected to heating and cooling. [less ▲]

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See detailConsideration of local instabilities by constituve law in a beam element in fire conditions
Peigneux, Christophe ULg; Franssen, Jean-Marc ULg

Conference given outside the academic context (2011)

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See detailAnalyse de la tenue au feu des structures. Tests ou simulations
Franssen, Jean-Marc ULg

Scientific conference (2011, January 20)

Pour quels types de matériaux peut-on faire des simulations? Quels tests dois-je envisager pour mes structures et où? Quelles sont les données d’entrées nécessaires pour faire de la simulation? Quels ... [more ▼]

Pour quels types de matériaux peut-on faire des simulations? Quels tests dois-je envisager pour mes structures et où? Quelles sont les données d’entrées nécessaires pour faire de la simulation? Quels types d’essais sont possibles pour valider les simulations? [less ▲]

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See detailTest results and model for the residual compressive strength of concrete after a fire
Li, Yi-Hai; Franssen, Jean-Marc ULg

in Journal of Structural Fire Engineering (2011), 2(1), 29-44

An investigation into temperature induced degradation of the compressive strength of concrete including that under cooling phase is carried out. The paper gathers and reviews a considerable amount of test ... [more ▼]

An investigation into temperature induced degradation of the compressive strength of concrete including that under cooling phase is carried out. The paper gathers and reviews a considerable amount of test data, considering the influence of different test parameters such as initial compressive strength, aggregate type, cooling regime and specimen shape. It is found that the compressive strength of concrete at high temperature is in accordance with the model proposed in the Eurocodes for calcareous concrete. However, during cooling phase, an additional reduction of compressive strength in concrete is observed, which can be as high as 20% of the initial strength for elevated temperatures around 500°C. Finally, a generic concrete model for temperature dependent compressive strength, accounting for both growth and cooling phase of temperature is proposed. The model can be used for simulating fire response of concrete structures subjected to natural fires or for the evaluation of residual load capacity of concrete structures after fire. [less ▲]

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See detailBehaviour of Grade 8.8 bolts under natural fire conditions - Tests and model
Hanus, François; Zilli, Guiliana; Franssen, Jean-Marc ULg

in Journal of Constructional Steel Research (2011), 67

Recent full-scale experimental tests perfomed on steel andcomposite structures have demonstrated that the presence of tensile forces in axially-restrained beams during the cooling phase of a fire could ... [more ▼]

Recent full-scale experimental tests perfomed on steel andcomposite structures have demonstrated that the presence of tensile forces in axially-restrained beams during the cooling phase of a fire could lead to bolt failures. In order to understand this observation and design structures that are not prone to such a failure mode, it is essential to have a deep knowledge of the material behaviour of all the components, including bolts, during both the heating and the cooling phase. In the present article, the test set-ups and the results of the tensile and shear tests performed at the CSM (Italy) on Grade 8.8 bolts under heating-cooling cycles are described. Then, material laws are defined for characterising the mechanical behaviour of Grade 8.8 bolts under heating and cooling phases. these laws account for the non-reversibility of the mechanical properties of Grade 8.8 bolts [less ▲]

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See detailComparison between various methods for the evaluation of the fire resistance of concrete filled hollow steel columns
Fellah, Farid; Dotreppe, Jean-Claude ULg; Seridi, Ahcène et al

in Proceeding of the Romanian Academy. Series A, Mathematics, Physics, Technical Sciences, Information Science (2011), 12(4), 324-331

Hollow steel columns filled with bar-reinforced concrete are used extensively in the construction of high-rise buildings. Many research works devoted to the fire resistance of these profiles have been ... [more ▼]

Hollow steel columns filled with bar-reinforced concrete are used extensively in the construction of high-rise buildings. Many research works devoted to the fire resistance of these profiles have been performed in Europe and in North America. Though calculation methods are now proposed in codes, more practical tools are needed by the design engineers. It is not easy to develop such methods due to the large scatter of experimental results. In this article three methods based on quite different procedures are examined. Comparisons have been made between the results obtained by the three methods and test results. The potentialities of each method are examined, but also the domains in which they should be used with care, or even they should not be used. [less ▲]

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See detailSeismic-induced fire resistance of composite welded beam-to-column joints with concrete-filled tubes
Pucinotti, Raffaele; Bursi, Oreste; Franssen, Jean-Marc ULg et al

in Fire Safety Journal (2011), 46

Major earthquakes in urban areas have often been followed by significant fires that cause extensive damage to property. Therefore, a seismic-induced fire is a scenario that should be addressed properly in ... [more ▼]

Major earthquakes in urban areas have often been followed by significant fires that cause extensive damage to property. Therefore, a seismic-induced fire is a scenario that should be addressed properly in performance-based engineering. In this paper, numerical and experimental results of welded steel–concrete composite full-strength beam-to-column joints under post-earthquake fires are described. This was part of a European project aimed at developing fundamental data and prequalification design guidelines of ductile and fire-resistant composite beam-to-column joints with concrete-filled tubes. In detail, seismic and fire analyses were used to design moment-resisting frames endowed with the proposed joint typology. A total of six specimens were designed and subjected to both monotonic and cyclic lateral loads. The specimens were subassemblages of beam-to-column joints, and performed well. Since the scope of the project was to promote joint typologies able to survive a seismic-induced fire, some specimens were pre-damaged before being subjected to fire loadings by imposing monotonic loads equivalent to damage levels induced by seismic loadings. Thus, after fire testing, valuable information about the performance of the proposed joint typology was obtained, and the adequacy of the concurrent seismic and fire design was demonstrated. [less ▲]

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See detailNumerical modeling of building structures in fire conditions
Binh, Chu Thi; Dotreppe, Jean-Claude ULg; Franssen, Jean-Marc ULg

in Van Lien, Nguyen; Duc, Do Dinh (Eds.) Proceedings of the workshop on “Construction under Exceptional Condition – CEC2010” (2010, October 29)

Numerical modelling is a very useful tool to predict the fire resistance of a structure, or to reproduce artificially what has happened during a real fire. SAFIR, a non linear computer code developed at ... [more ▼]

Numerical modelling is a very useful tool to predict the fire resistance of a structure, or to reproduce artificially what has happened during a real fire. SAFIR, a non linear computer code developed at the university of Liege-Belgium, is specifically written for modeling the behavior of structures subjected to fire. It allows a determination of the temperatures in the structure esulting from the fire and, in a subsequent analysis, determination of the successive positions of equilibrium of the structure until collapse. SAFIR program accommodates various elements for different idealizations, different calculation procedures and several material models incorporating stress-strain behaviour. The elements include 2-D SOLID, 3-D SOLID, BEAM, SHELL and TRUSS elements. The stress-strain material laws are generally linear-elliptic for steel and nonlinear for concrete. This paper introduces the main hypotheses, the possibilities and the validity of this program. Comparisons of test results and simulated results by SAFIR program for concrete structures, steel structures and concrete-steel composite structures are presented. [less ▲]

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See detailPrise en compte des effets indirects dans l’évaluation de la stabilité au feu de bâtiments industriels en acier
Franssen, Jean-Marc ULg

Conference given outside the academic context (2010)

What are indirect effects of actions? Do we have to take these effects into account? How to take these effects into account?

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See detailRecherche dans le domaine du béton à l'Université de Liège (2009-2010)
Dotreppe, Jean-Claude ULg; Franssen, Jean-Marc ULg; Somja, H. et al

Scientific conference (2010, October 21)

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See detailEurocodes applied to fire scenarios. From a fire scenario to dimensioning
Franssen, Jean-Marc ULg

Conference given outside the academic context (2010)

The general context for utilisation of the fire Eurocodes in Belgium is given. The field of application covered by the Eurocodes is presented. The different sources of obligation for using the Eurocodes ... [more ▼]

The general context for utilisation of the fire Eurocodes in Belgium is given. The field of application covered by the Eurocodes is presented. The different sources of obligation for using the Eurocodes are presented, as well as the different sources where requirements in term of fire resistance are coming. The difference is shwon beteween tabulated data, simple calculation models and general calculation models. [less ▲]

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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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