• Kleinhenz, Miriam
• Frangi, Andrea
• Just, Alar

Abstract

The composite structure of cross‐laminated timber rib panels consists of cross‐laminated timber (CLT) plates connected to glued‐laminated timber (glulam) ribs. Full composite action is provided by a rigid connection between the composite components by means of screw‐press gluing. For ribbed cross‐sections, the assumption that the cross‐section remains plane is incorrect. The simple beam theory according to Euler‐Bernoulli is not applicable because the strains in the flange vary according to the distance from the rib due to the in‐plane shear flexibility of the flange, leading to a non‐uniform distribution of the longitudinal strains along the flange width. For simplified structural analysis, the effective width defines an equivalent cross‐section that provides the same maximum bending stress and effective bending stiffness as the actual cross‐section. Simplified formulae are proposed as basis for the final document of CLT design for a revised version of Eurocode to determine the effective width at normal temperature for ribbed plates build up from cross‐laminated timber plates.In an ongoing research project, fire resistance of cross‐laminated timber rib panels (CLT rib panels) is studied with experimental and numerical analysis. The experimental results of a series of full‐scale fire tests showed more than 90 and 120 min of fire resistance and confirmed the assumption that the effect of the composite action was maintained in fire. The proposed paper focuses on the numerical simulation of the structural behaviour of CLT rib panels exposed to ISO‐standard fire and loaded out of plane for the discussion of the effective width in fire.

Topics

• impedance spectroscopy
• theory
• simulation
• composite