References of "Franssen, Jean-Marc"
     in
Bookmark and Share    
Full Text
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 ▲]

Detailed reference viewed: 61 (15 ULg)
Full Text
Peer Reviewed
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)

Detailed reference viewed: 69 (16 ULg)
Full Text
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 ▲]

Detailed reference viewed: 86 (4 ULg)
Full Text
Peer Reviewed
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 [=JSFE] (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 ▲]

Detailed reference viewed: 38 (1 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 30 (0 ULg)
Full Text
Peer Reviewed
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.

Detailed reference viewed: 644 (12 ULg)
Full Text
Peer Reviewed
See detailDistribution of temperature in steel and composite beams and joints under natural fire
Hanus, François; Franssen, Jean-Marc ULg

Conference (2011, April 29)

Parametric numerical analyses have been performed with SAFIR for the temperature distribution in steel and composite beams and joints subjected to natural fires. A simple model has been derived to ... [more ▼]

Parametric numerical analyses have been performed with SAFIR for the temperature distribution in steel and composite beams and joints subjected to natural fires. A simple model has been derived to calculate the temperature development in the upper flange of the steel section supporting a concrete slab. This model takes into account, not only the heat transfer with the surounding hot gases, but also the heat transfer 1) by conduction with the lower part of the section through the web and 2) with the supported concrete slab. [less ▲]

Detailed reference viewed: 36 (0 ULg)
Full Text
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 ▲]

Detailed reference viewed: 73 (8 ULg)
Full Text
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 ▲]

Detailed reference viewed: 96 (6 ULg)
Full Text
See detailDéveloppement d'un modèle constitutif multiaxial de béton
Gernay, Thomas ULg; Millard, Alain; Franssen, Jean-Marc ULg

Scientific conference (2011, March 03)

Detailed reference viewed: 49 (21 ULg)
Full Text
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 ▲]

Detailed reference viewed: 120 (1 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 175 (43 ULg)
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)

Detailed reference viewed: 58 (7 ULg)
Full Text
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 ▲]

Detailed reference viewed: 70 (4 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 43 (2 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 48 (7 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 44 (1 ULg)
Full Text
Peer Reviewed
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 [=JSFE] (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 ▲]

Detailed reference viewed: 139 (15 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 137 (4 ULg)