Numerical 3D finite element modelling and experimental tests for dowel-type timber joints

Abstract

This study is a contribution to various scientific researches on dowel-type timber joints. In this paper, a three-dimensional (3D) finite element model is developed to predict the mechanical behaviour of steel-to-timber joints loaded in parallel-to-grain tension. The adopted material model is based on the isotropic behaviour of the steel and the transverse isotropy behaviour of the timber. In order to take into account the asymmetric mechanical behaviour of timber material in tension and compression, Hoffman failure criterion is associated with the Hill criterion to control the plastic yielding combined with the damage evolution of timber. Besides, the interaction among materials is modelled using contact elements associated with friction. The results obtained in numerical simulations are evaluated and compared with experimental results. The model showed the capacity to simulate the behaviour of the timber joints. Moreover, an analytical model based on stress interactions is presented to calculate the failure loads of the timber joints.