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See detailFire resistance of long span cellular beam made of rolled profiles (FICEB) report: Ulster test numerical simulation
Gernay, Thomas ULg; Franssen, Jean-Marc ULg

Report (2009)

In the Ulster fire test, a large scale composite floor using cellular beams connected to composite slabs will be tested under natural fire. The particularity of the composite floor in this test is that ... [more ▼]

In the Ulster fire test, a large scale composite floor using cellular beams connected to composite slabs will be tested under natural fire. The particularity of the composite floor in this test is that certain cellular beams will be without any fire protection in order to investigate the contribution of membrane effect to overall fire resistance. However, cellular beams could behave in a very different way compared to traditional steel beams because of risk of local phenomenon. The aim of this study was to build a complex FE Model of whole composite floor system with long span cellular beams connected to composite slab in order to take account of 3D membrane effect. This permitted, on the one hand, to find out the right numerical model for this type of composite floor, and on the other hand to define the appropriate structure to be used for the full scale fire test. In order to achieve this latter purpose, a sensitivity study has be carried out in which determinant parameters for ensuring a good membrane effect have been investigated. [less ▲]

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See detailFire resistance of restrained columns
Franssen, Jean-Marc ULg

Scientific conference (1998, March 18)

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See detailFire resistance of simple frames according to eurocode 3
Franssen, Jean-Marc ULg; schröder, L.; Dotreppe, Jean-Claude ULg

in Batista, C.; de M Batista, Eduardo; Pfeil, Michèle S. (Eds.) Proc. 5th Int. Colloquium on Structural Stability (1996)

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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 detailFire resistance of unrestrained welded steel beams submitted to lateral-torsional buckling
Vila Real, P. M. M.; Lopes, N.; Simoes da Silva, L. et al

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 detailFire safety engineering analysis of a super market structure composed of cambered cellular beams
Franssen, Jean-Marc ULg; Majkut, S.; Cajot, L.-G. et al

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 detailFire salamander (Salamandra salamandra) in Larzac plateau: low occurrence, pond-breeding and cohabitation of larvae with paedomorphic palmate newts (Lissotriton helveticus)
Denoël, Mathieu ULg; Winandy, Laurane ULg

in Acta herpetologica (2014), 9(1), 43-49

Alternative reproductive strategies are widespread in caudate amphibians. Among them, fire salamanders (Salamandra salamandra) usually rely on streams to give birth to aquatic larvae but also use ponds ... [more ▼]

Alternative reproductive strategies are widespread in caudate amphibians. Among them, fire salamanders (Salamandra salamandra) usually rely on streams to give birth to aquatic larvae but also use ponds, whereas palmate newt larvae (Lissotriton helveticus) typically metamorphose into terrestrial juveniles, but can also reproduce in retaining their gills, a process known as paedomorphosis. Here we report repeated observations of an unusual case of coexistence of these two alternative traits in the same pond (Larzac, France). The prevalence of fire salamanders in Southern Larzac was very low (pond occupancy: 0.36%). The observed abundance of fire salamander larvae and paedomorphic newts was also low in the studied pond. On one hand, the rarity of this coexistence pattern may suggest that habitat characteristics may not be optimal or that competition or predation processes might be operating. However, these hypotheses remain to be tested. On the other hand, as this is the only known case of breeding in Southern Larzac, it could be considered to be at a high risk of extirpation. [less ▲]

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See detailFire test on normal and high-strength reinforced concrete columns
Aldea, C. M.; Franssen, Jean-Marc ULg; Dotreppe, Jean-Claude ULg

in NIST Special Publication 919 (1997)

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See detailFIRE TESTING OF HIGH-STRENGTH STEEL CIRCULAR COLUMNS
Tondini, Nicola; Van Long, Hoang; Demonceau, Jean-François ULg et al

Conference (2013, September 30)

This paper presents an experimental-numerical study on the behaviour of High Strength Steel (HSS) columns at elevated temperature, both on Circular Hollow Sections (CHS) and on a Concrete Filled Tube (CFT ... [more ▼]

This paper presents an experimental-numerical study on the behaviour of High Strength Steel (HSS) columns at elevated temperature, both on Circular Hollow Sections (CHS) and on a Concrete Filled Tube (CFT). The measured yield strength of the circular sections was in the order of 820 MPa. In detail, three HSS CHS and a HSS CFT were tested under the standard ISO fire with constant eccentric compression load. The evolution of temperature and defor-mation patterns were measured by means of a comprehensive instrumentation made of ther-mocouples and displacement transducers. Numerical analyses were performed and compared with experimental data by employing stress-strain relationships of carbon steel at elevated temperatures provided by EN1993-1-2 associated with two different sets of reduction factors: i) those provided by EN1993-1-2 valid up to S460 steel grades; and ii) those proposed in the literature and based on tests on HSS. [less ▲]

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See detailFire tests and calculation methods for circular concrete columns
Franssen, Jean-Marc ULg; Dotreppe, Jean-Claude ULg

in Fire Technology (2003), 39(1), 89-97

The introduction sets the scene of the present paper i.e. the extensive research works performed at the University of Liege in order to derive acceptable calculation methods for the re design of concrete ... [more ▼]

The introduction sets the scene of the present paper i.e. the extensive research works performed at the University of Liege in order to derive acceptable calculation methods for the re design of concrete columns. It is explained that all previous works have been based on square or rectangular cross sections, for which corner spalling was observed very often, whereas circular section are nowadays becoming more and more popular. In order to examine the influence of the circular shape on the behavior under re conditions, an experimental research study has been performed recently at the University of Liege. This paper describes the test procedure, the observations made, and the values obtained for the re resistance. Theoretical methods have been developed for a quick, safe, and efficient design of concrete columns under re conditions. These methods have been applied successfully to the recently tested circular columns. [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 detailFires of Pianura: The Antidump Struggle in the Western Outskirt of Naples
De Biase, Marco ULg

in Capitalism, Nature, Socialism (2015), 26(1), 39-58

This ethnographic study aimed at analyzing the rebellion in Pianura, which took place between December 2007 and January 2009 when Naples' streets were covered with rubbish. It was a violent protest ... [more ▼]

This ethnographic study aimed at analyzing the rebellion in Pianura, which took place between December 2007 and January 2009 when Naples' streets were covered with rubbish. It was a violent protest involving some 40.000 people who wanted to object to the reopening of the old dump of Pianura, one of the most toxic in Europe and no longer in use. The fear for their own life, the desperation of local population, and the anger after being attacked by the police during pacific protest gave origin to a real urban guerrilla targeting the political system. This article aims to go beyond the dominant narration of the events developed by the media and the authorities, which interpreted the uprising of Pianura in terms of Nimby (Not in my back yard), and as a mere manifestation of violence that was carried out by a group of extremists. On the contrary, it will be argued that the anti-dump struggle of Pianura, in its diverse forms, was animated by a radical critique of a specific model of local and national development (Gramsci 2007; Della Porta 2006). In order to support this argument the context of Pianura and the various mobilizations set up by the local population are analysed in this article. In addition, the heterogeneous and fragmented nature of the movement is explained through Bayat’s (1997; 2000) concept of “street politics” and that of “rebel bricolage” inspired by the work of Levi-Strauss (1966). More in detail, the analysis is focused on the effects of the “waste politics” on the body of the protesters, which became an important tool of resistance and an instrument to claim fundamental rights (Fassin, Memmi 2004). Finally, this article investigates the role of some groups of ultrà (football supporters) who actively participated in the demonstrations, and their relationship with the criminalizing discourses that were constructed to discredit the struggle. [less ▲]

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See detailFirm-Level Evidence on Innovation in Spain
Artige, Lionel ULg

Conference (2009, October 08)

Detailed reference viewed: 29 (7 ULg)
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See detailFirst and second generations of COX-2 selective inhibitors
De leval, X.; Julémont, F.; Benoit, V. et al

in Mini Reviews in Medicinal Chemistry (2004), 4

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See detailFirst and second order convex approximation strategies in structural optimization
Fleury, Claude ULg

in Structural and Multidisciplinary Optimization (1989), 1(1), 3-10

In this paper, various methods based on convex approximation schemes are discussed, that have demonstrated strong potential for efficient solution of structural optimization problems. First, the convex ... [more ▼]

In this paper, various methods based on convex approximation schemes are discussed, that have demonstrated strong potential for efficient solution of structural optimization problems. First, the convex linearization method (CONLIN) is briefly described, as well as one of its recent generalizations, the method of moving asymptotes (MMA). Both CONLIN and MMA can be interpreted as first order convex approximation methods, that attempt to estimate the curvature of the problem functions on the basis of semi-empirical rules. Attention is next directed toward methods that use diagonal second derivatives in order to provide a sound basis for building up high quality explicit approximations of the behaviour constraints. In particular, it is shown how second order information can be effectively used without demanding a prohibitive computational cost. Various first and second order approaches are compared by applying them to simple problems that have a closed form solution. [less ▲]

Detailed reference viewed: 15 (0 ULg)