Numerical 3D finite element modelling and experimental tests of rounded dovetail connection

The mechanical behaviour of the rounded dovetail connection subjected to shear load is analysed experimentally and numerically. The brittle failure of the joist member is observed in the experimental investigation. The experimental results are used to validate a three-dimensional (3D) non-linear finite element model. The non-linear models use the Hill criterion to manage the plastic yielding of the wood material. The modified Hill failure criteria, managing the damage evolution in wood, are used to take into account the brittle failure in shear and tension. Besides, the models also incorporate the contact and the geometric non-linearity. The comparison with experimental results shows that the numerical models are in good agreement with real behaviour. The validated models can be used to predict the strength and failure position of the rounded dovetail connection for parametric studies.