References of "Dotreppe, Jean-Claude"
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See detailHeat transfer and structural response modelling of concrete filled steel hollow section columns
Binh, Chu Thi; Dotreppe, Jean-Claude ULg; Franssen, Jean-Marc ULg

in Proc; ACOME (2012)

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 resulting from the fire and, in a subsequent analysis, determination of the successive positions of equilibrium of the structure until collapse. Ten steel hollow section columns filled with self-compacting concrete embedding another steel profile have been tested in the Fire Engineering Laboratory of the University of Liege - Belgium. SAFIR code has been used to simulate the thermal and structural behavior under fire conditions. A good agreement between numerical and experimental results has been obtained. This shows that SAFIR code can predict well the behavior of CFSHS columns subjected to fire. [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 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 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 detailSteel Hollow Columns filled with self compacting Concrete under Fire Conditions
Dotreppe, Jean-Claude ULg; Chu, Thi Binh; Franssen, Jean-Marc ULg

in The third International Congress and Exhibition - Proceedings Disc (2010)

Concrete filled steel hollow section (CFSHS) columns can carry important loads and therefore are used extensively in the construction of high-rise buildings. Steel hollow sections are filled usually with ... [more ▼]

Concrete filled steel hollow section (CFSHS) columns can carry important loads and therefore are used extensively in the construction of high-rise buildings. Steel hollow sections are filled usually with ordinary concrete, but filling problems may arise with small cross sections and dense reinforcement or hollow sections (tubes) surrounding another profile (tube or H section) when the distance between the two profiles is small. For such a configuration, self-compacting concrete can be recommended. Ten columns filled with self-compacting concrete embedding another steel profile have been tested in the Fire Engineering Laboratory of the University of Liege - Belgium. The non linear finite element software SAFIR developed at the University of Liege has been used to simulate the thermal and structural behavior under fire conditions. A good agreement between numerical and experimental results has been obtained. This shows that SAFIR code can predict well the behavior of CFSHS columns and that the properties of self-compacting concrete at high temperatures can be considered to be the same as those of ordinary concrete. Another purpose of this study was to give practical tools to consulting engineers. [less ▲]

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See detailRecherches menées à l'Université de Liège dans le domaine du béton en 2008-2009
Dotreppe, Jean-Claude ULg; Franssen, Jean-Marc ULg; Somja, Hugues et al

Conference given outside the academic context (2009)

Composite steel-concrete columns made of CFSHS filled with self compacting concrete under ambaint temperature and in the fire situation. Design equation for the buckling of high strength concrete columns ... [more ▼]

Composite steel-concrete columns made of CFSHS filled with self compacting concrete under ambaint temperature and in the fire situation. Design equation for the buckling of high strength concrete columns subkected to compression and bending. Improvement of the textural quality of concrete with hydraulic binders. Influence of the reutilisation of OSB panels shuttering on the colour and texture of concrete surfaces. Non destructive methods for the detection of delamination in the decks of concrete bridges [less ▲]

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See detailFire action and design approach
Franssen, Jean-Marc ULg; Dotreppe, Jean-Claude ULg; Both, K. et al

in Fire design of concrete structures - structural behaviour and assessment. State-of-art report. (2008)

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See detailCalcul de la résistance au feu d'ouvrages d'art en intégrant l'éclatement du béton
Franssen, Jean-Marc ULg; Hanus, François ULg; Dotreppe, Jean-Claude ULg

Scientific conference (2007, July 06)

Les ouvrages en béton présentent en général une bonne résistance au feu. Toutefois, dans certaines situations, l'apparition de phénomènes d'éclatement peut mener à une réduction rapide et marquée de la ... [more ▼]

Les ouvrages en béton présentent en général une bonne résistance au feu. Toutefois, dans certaines situations, l'apparition de phénomènes d'éclatement peut mener à une réduction rapide et marquée de la résistance des éléments concernés. Les tunnels, qui sont souvent soumis à des incendies de très forte intensité, subissent très souvent la perte de leurs premières couches intérieures pouvant conduire à la mise à nu des armatures. dans cet article, on montre comment le logiciel SAFIR peut être utilisé pour effectuer une analyse de risque en intégrant des valeurs plausibles de l'éclatement. ce concept sera illustré par l'examen d'une structure particulière. [less ▲]

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See detailSimple formula for evaluating the fire resistance of axially loaded steel square hollow section columns filled with concrete
Dotreppe, Jean-Claude ULg; Binh, C. T.; Chuong, N. T. et al

in Proceedings of the 1st International Conference on Modern Design, Construction and Maintenance of Structures (2007)

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See detailConsidering the effects of localised fires in the numerical analysis of a building structure
Franssen, Jean-Marc ULg; Pintea, Dan; Dotreppe, Jean-Claude ULg

in Fire Safety Journal (2007), 42(6-7, SEP-OCT), 473-481

The methodologies that are used for analysing the fire behaviour of a structure that is subjected to a uniform thermal situation cannot be applied when the fire is localised. The concept of "zoning" can ... [more ▼]

The methodologies that are used for analysing the fire behaviour of a structure that is subjected to a uniform thermal situation cannot be applied when the fire is localised. The concept of "zoning" can be applied: the structure is divided into several zones in which the situation is approximated as uniform. It is shown here that this division can lead to spurious forces in the structure. The structural code of the first author has been adapted in order to accommodate a continuous spatial variation of the fire environment. A series of uncoupled 2D thermal analyses is performed along the length of the beam finite elements and a series of ID thermal analyses is performed across the thickness of the shell finite elements. After a discussion of the concept and the particularities dictated by the continuous thermal environment, the methodology utilised is explained and is shown in an example consisting of a composite steel concrete car park subjected to a localised fire of the type given in Eurocode 1. (C) 2007 Elsevier Ltd. All rights reserved. [less ▲]

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See detailEffects of localized fires on concrete slabs
Franssen, Jean-Marc ULg; Dotreppe, Jean-Claude ULg

in Toutlemonde, F. (Ed.) Proceedings of CONSEC'07 (2007)

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See detailNumerical evaluation of the fire behaviour of a concrete tunnel integrating the effects of spalling
Franssen, Jean-Marc ULg; Hanus, François ULg; Dotreppe, Jean-Claude ULg

in Proceedings of the Fire Design of Concrete Structures from Materials Modelling to Structural Performance Workshop (2007)

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See detailNumerical analysis of the effect of localised fires on composite steel concrete buildings
Franssen, Jean-Marc ULg; Pintea, D.; Dotreppe, Jean-Claude ULg

in Vila Real, P. M. M. (Ed.) Proceedings of the 4th International workshop Structures in Fire (2006)

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See detailFire resistance of timbers from tropical countries and comparison of experimental charring rates with various models
Njankouo, Jacques Michel; Dotreppe, Jean-Claude ULg; Franssen, Jean-Marc ULg

in Construction & Building Materials (2005), 19(5), 376-386

Tropical hardwood species are more and more used in the field of construction due to the particular qualities they can offer. Presently it is no longer possible to envisage the development of construction ... [more ▼]

Tropical hardwood species are more and more used in the field of construction due to the particular qualities they can offer. Presently it is no longer possible to envisage the development of construction materials and products without taking into consideration the problem of their fire behaviour, and more particularly of their fire resistance. In the case of timber elements, this characteristic is mainly influenced by the charring rate of the external layers of the element. On the other hand this parameter is influenced by the density of the material. Limited information is available on the charring rate of tropical hardwood species. Therefore experimental investigations have been conducted at the University of Liege to study this characteristic. Seven tropical and three timber species from temperate countries have been examined. Two types of test have been used, one on small specimens, the other on a construction element made of one single material. In the first type, 20 specimens have been manufactured by gluing several laminates together. The specimens were instrumented with four thermocouples inserted at various depths in four different laminates. In the second type, a non-loaded wall made of 12 glued-laminated spruce beam profiles was instrumented with thermocouples embedded at different depths in the panel for the evaluation of the charring rate. Experimental charring rates have been compared with the results derived from Eurocode EC5-1.2 recommendation [ENV 1995-1-2. Eurocode 5: Design of timber structures - Part 1-2: General rules - Structural fire design. European prestandard; 1994], Australian standard AS 1720.4 relation [AS 1720.4. Timber structures Part 4: fire resistance of structural timber members. North Sydney, Australia: Standards Australia; 1990] and White's model [Charring rates of different wood species. PhD dissertation. Madison University of Wisconsin, Madison, WI, 1988; White RH, Erik V, Nordheim EV. Charring rate of wood for ASTM El 19 exposure. Fire Technol 1992-28(1)]. This comparison shows that the results obtained from these three models are not entirely satisfactory for tropical hardwood species. Therefore a new model has been proposed. (C) 2004 Elsevier Ltd. All rights reserved. [less ▲]

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See detailEffect of localised fires on continuous steel beams
Franssen, Jean-Marc ULg; Gens, F.; Dotreppe, Jean-Claude ULg

in Hoffmeister, B.; Hechler, O. (Eds.) Proceedings of the 4th European Conference on Steel and Composite Structures (EUROSTEEL 2005) (2005)

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See detailFailure of a Tied-Arch Bridge Submitted to a Severe Localized Fire
Dotreppe, Jean-Claude ULg; Majkut, S.; Franssen, Jean-Marc ULg

in Proceedings of the IABSE Symposium Lisbon (2005)

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See detailProgressive load redistribution in continuous concrete beams and slabs under fire conditions
Dotreppe, Jean-Claude ULg; Gens, F.; Franssen, Jean-Marc ULg

in Proceedings of the fib Symposium "Keep concrete attractive" Vol.2 (2005)

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See detailPrecast Hollow Core Slabs in Fire: Numerical Simulations and Experimental Tests
Dotreppe, Jean-Claude ULg; Franssen, Jean-Marc ULg

in Franssen, Jean-Marc; Benichou; Kodur (Eds.) et al Proceedings of SiF'04: Third International Structures in Fire workshop (2004)

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See detailExperimental study of the charring rate of tropical hardwoods
Njankouo, Jacques Michel; Dotreppe, Jean-Claude ULg; Franssen, Jean-Marc ULg

in Fire & Materials (2004), 28(1, JAN-FEB), 15-24

This paper describes an experimental investigation of the charring rates of timber. An experimental procedure was designed for assessing the charring rate of 20 specimens exposed to fire in a single test ... [more ▼]

This paper describes an experimental investigation of the charring rates of timber. An experimental procedure was designed for assessing the charring rate of 20 specimens exposed to fire in a single test, with one-dimensional heat transfer conditions. Each test specimen was manufactured by gluing seven laminates together. Four thermocouples were inserted at different depths in four different laminates located in the middle of the test specimen. The test was conducted using a gas-fired furnace and specimens were exposed to the standard ISO 834 fire. In order to evaluate the fire performance of tropical hardwoods, seven different species with densities ranging from 500 to 1000 kg/m(3) were used. For the purpose of verifying the experimental procedure against existing data, two softwood species (spruce and fir) and one European hardwood species (oak) were also examined. Experimental results indicate that the test method and procedure can be used for assessing the charring rate of timber both for softwood and for hardwood species. They also show that the density of wood significantly affects the charring rate and that the values recommended in Eurocode 5 for high densities are somewhat too conservative. Copyright (C) 2004 John Wiley Sons, Ltd. [less ▲]

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See detailA tool to design steel elements submitted to compartment fires - OZone V2. Part 2: Methodology and application
Cadorin, Jean-François; Pintea, Dan; Dotreppe, Jean-Claude ULg et al

in Fire Safety Journal (2003), 38(5), 429-451

The methodology implemented in the tool OZone V2 to design steel elements submitted to compartment fires is presented. Input needed to define a fire compartment are first quoted. The procedure to define ... [more ▼]

The methodology implemented in the tool OZone V2 to design steel elements submitted to compartment fires is presented. Input needed to define a fire compartment are first quoted. The procedure to define the design fire is then explained. This procedure enables to take into account the benefits of active measures on the fire safety. The combined use of a two- and a one-zone model is then presented. A particular attention is given to the criteria of choice of the model and to the different scenarios that can occur. The calculation of steel element temperature is then explained. The proposed procedure takes into account the localised effect of a fire with the help of Hasemi's model. The fire resistance is then calculated with the EUROCODE 3 methods. An application is finally presented. (C) 2003 Elsevier Science Ltd. All rights reserved. [less ▲]

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