Steel and Composite Structures

  • 제34권3호
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  • Pages.441-452
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  • 2020
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
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Investigation on the flexural behavior of an innovative U-shaped steel-concrete composite beam

  • 투고 : 2019.08.06
  • 심사 : 2019.11.04
  • 발행 : 2020.02.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

과제정보

This test took place in the framework of the "COMINO" PhD research project (CIFRE grant 2017/0048) in partnership with CTICM, University of Lorraine and University of Luxembourg. The steel sections were supplied by the company BRIAND. The steel fasteners were supplied by the company HILTI. Their supports are gratefully acknowledged as well as the work made by the team of the laboratory of structural engineering of the University of Luxembourg. However, the conclusions and recommendations presented in this article are independent and do not necessarily reflect the views of the sponsors.

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