A Stiffness-based Approach to Analyze the Fire Behaviour of Cross-Laminated Timber Floors

Lorenzo Franzoni (1, 2) , Dhionis Dhima (1) , Arthur Lebée (2) , Florent Lyon (1) , Gilles Forêt (2)

1 CSTB - Centre Scientifique et Technique du Bâtiment
2 navier umr 8205 - Laboratoire Navier

In the present paper, the experimental deflection of cross-laminated timber floors exposed to fire is predicted with the use of advanced and simplified methods. The accurate modelling is based on heat transfer prediction and reduced stiffness, while the simplified methods are based on reduced cross-section method (RCSM) of EN 1995 1-2 (CEN, 2004). All methods are combined with a thick plate theory for laminates in order to compute the mid-span deflection of the floors. The more accurate modelling returned a better agreement with the experimental reference than RCSM approaches. Finally, a RCSM approach based on the time dependency of the zero stiffness layer is suggested.

Mots clés: CLT FLOORS; DEFLECTION; FIRE TESTS; REDUCED CROSS-SECTION METHOD; STRUCTURAL FIRE DESIGN

Domaines: Mécanique des structures [physics.class-ph]

Lorenzo Franzoni, Dhionis Dhima, Arthur Lebée, Florent Lyon, Gilles Forêt. A Stiffness-based Approach to Analyze the Fire Behaviour of Cross-Laminated Timber Floors. Structural Engineering International, 2017, 27 (2), pp.238 - 245. ⟨10.2749/101686617X14881932435411⟩. ⟨hal-01691117⟩