Keywords: timber structures, cross-laminated timber, CLT, screwed assemblies, finite element analysis, experimental, Johansen theory, orthotropic behaviour, nonlinear models, Hill criterion..

The present paper describes experimental and numerical researches on crosslaminated timber (CLT) assemblies. The experimental study was performed with cross-laminated panels of a thickness of six centimetres and SFS WR-T screws. Preliminary tests have been made in order to characterise the embedment strength and the axial load-carrying capacity. Single shear assemblies have been tested in different situations: with and without a gap between the panels, with screws perpendicular and not perpendicular to the shear planes. Finite element models have been established simultaneously in order to approach as close as possible the experimental results. The software used is Abaqus. The timber is modelled as an anisotropic material and the orientation is longitudinal, radial and tangential with respect to the layout of the crossed layers of the CLT panels. The Hill criterion is used to take into account the plastic anisotropy of the wood. For the assemblies with a gap, the possibility for the screw to bend have to be taken into account, as well as the compression and the tension that appear when the screws are not perpendicular to the shear planes. These aspects are likely to generate new failure modes (buckling of the screws). For this reason, experimental tests are useful to calibrate the numerical models.

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