References of "Khelil, Abdelouahab"
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See detailInvestigations on the lateral-torsional buckling of an innovative U-shaped steel beam in construction stage of composite beam
Turetta, Maxime; Odenbreit, Christoph UL; Khelil, Abdelouahab et al

in Structures (2022), 44

Structural elements of building have to meet a multitude of requirements. Besides the static load bearing capacity, common requirements are the structural integrity and efficiency during the construction ... [more ▼]

Structural elements of building have to meet a multitude of requirements. Besides the static load bearing capacity, common requirements are the structural integrity and efficiency during the construction stage and sufficient fire resistance. Within the French CIFRE research project COMINO, an innovative type of composite beam was developed for buildings beams with a span of 6 -12m, which need fire resistance until 2 hours with no additional supports at construction stage. The developed solution is composed of a steel U-section acting as a formwork in construction stage for a reinforced concrete part that provides the fire resistance. In the exploitation stage, the steel and the reinforced concrete are acting together as a composite beam. In construction stage, when the concrete is not hardened and thus the stabilizing effect is not present, the steel beam, is subjected to Lateral-Torsional Buckling. In order to investigate the structural behaviour of the new developed steel section in construction stage, a single full-scale test has been carried out at the Laboratory of Structural Engineering of the University of Luxembourg. This article focuses on the stability of the steel beam made of thin-walled steel parts without considering any stabilizing effect. The test results are then compared to the results of numerical investigations and to the analytical solutions of EN 1993. [less ▲]

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See detailEtude experimentale et numerique du comportement mecanique d'une solution innovante de pourte mixte Acier-Beton en forme de U
Turetta, Maxime; Martin, Pierre-Oliver; Khelil, Abdelouahab et al

in Revue construction métallique (2021), 1

Pour conquérir de nouvelles parts de marché ou simplement défendre ses positions sur un marché très concurrentiel, il faut sans cesse améliorer la compétitivité des procédés constructifs utilisés. La ... [more ▼]

Pour conquérir de nouvelles parts de marché ou simplement défendre ses positions sur un marché très concurrentiel, il faut sans cesse améliorer la compétitivité des procédés constructifs utilisés. La prise en compte de la réglementation incendie s’avère avoir une grande influence sur les matériaux constructifs et peut remettre en cause certains avantages de la filière métallique. Les solutions mixtes acier-béton constituent un très bon compromis, permettant d’optimiser la consommation des matériaux, de réduire les temps de montage tout en répondant aux exigences réglementaires en matière de sécurité incendie même les plus contraignantes notamment pour des établissements recevant du public (ERP), des sites sensibles ou encore des immeubles de grande hauteur (IGH). [less ▲]

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See detailInvestigation on the flexural behavior of an innovative U shaped steel concrete composite beam
Turetta, Maxime; Odenbreit, Christoph UL; Khelil, Abdelouahab et al

in Steel and Composite Structures (2020), 34(3), 441--452

Within the French CIFRE research project COMINO, an innovative type of composite beam was developed for buildings that need fire resistance with no additional supports in construction stage. The developed ... [more ▼]

Within the French CIFRE research project COMINO, an innovative type of composite beam was developed for buildings that need fire resistance with no additional supports in construction stage. The developed solution is composed of a steel U-shaped beam acting as a formwork in construction stage for a reinforced concrete part that provides the fire resistance. In the exploitation stage, the steel and the reinforced concrete are acting together as a composite beam. This paper presents the investigation made on the load bearing capacity of this new developed steel-concrete composite section. A full-scale test has been carried out at the Laboratory of Structural Engineering of the University of Luxembourg. The paper presents the configuration of the specimen, the fabrication process and the obtained test results. The beam behaved compositely and exhibited high ductility and bending resistance. The shear connection in the tension zone was effective. The beam failed by a separation between the slab and the beam at high deformations, excessive shear forces conducted to a failure of the stirrups in this zone. The test results are then compared with good agreement to analytical methods of design based on EN 1994 and design guidelines are given. [less ▲]

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See detailNumerical study on the load bearing capacity of a steel U section beam used as a formwork in constrcution stage
Turetta, Maxime UL; Khelil, Abdelouahab; Odenbreit, Christoph UL et al

Scientific Conference (2018, September 05)

For many categories of buildings, the structural elements must be fire resistant to allow people to evacuate and firefighters to intervene. A new type of steel-concrete composite solution dedicated to ... [more ▼]

For many categories of buildings, the structural elements must be fire resistant to allow people to evacuate and firefighters to intervene. A new type of steel-concrete composite solution dedicated to steel building structures is under development to resist against this fire situation. The solution is composed of a steel U section acting as a formwork for a reinforced concrete part that provides the fire resistance. In order to keep the habits of steel construction, the solution is unpropped in construction stage and the concrete is casted on site. Thus the solution has to resist against three majors situations: the construction stage without propping, the exploitation stage and the fire situation. The steel part of the composite beam is then designed to face the construction stage without propping. The present paper describes the numerical investigations carried out on the load bearing capacity of this steel section in construction stage. The objective of these investigations is to finally propose a steel solution stable and resistant for its use during construction stage. The numerical model of the steel section and its boundary conditions are presented. A first elastic calculation is used to determine the Eigen modes of the beam that give the shape of initials imperfections. Then analysis considering materials non-linearity and geometrical imperfections (GMNIA calculation) are carried out. A sensitivity study on the influence of the geometrical imperfections on the load bearing capacity of the beam is performed. Then, with the more conservative initial imperfection, a study on the global stability of the beam without any intermediate restraint is carried out. Finally, to overcome the problem of instability in construction stage, the restraint induced by the perpendicular steel decks is investigated. [less ▲]

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