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Numerical study on the load bearing capacity of a steel U section beam used as a formwork in constrcution stage
Turetta, Maxime; Khelil, Abdelouahab; Odenbreit, Christoph et al.
2018International Conference on Engineering Research and Practice for Steel Construction 2018 (ICSC2018) Hong Kong, China, 5 to 7 September 2018
 

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Keywords :
Numerical simulations; Lateral Torsional Buckling; Steel deck restraint; Steel Structures; GMNIA
Abstract :
[en] 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.
Disciplines :
Civil engineering
Author, co-author :
Turetta, Maxime ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC)
Khelil, Abdelouahab
Odenbreit, Christoph ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Martin, Pierre-Olivier
External co-authors :
yes
Language :
English
Title :
Numerical study on the load bearing capacity of a steel U section beam used as a formwork in constrcution stage
Publication date :
05 September 2018
Number of pages :
10
Event name :
International Conference on Engineering Research and Practice for Steel Construction 2018 (ICSC2018) Hong Kong, China, 5 to 7 September 2018
Event place :
Hong Kong, China
Event date :
from 05-09-2018 to 07-09-2018
Audience :
International
Focus Area :
Computational Sciences
Name of the research project :
COMINO
Available on ORBilu :
since 29 November 2018

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