This study introduces an extended analytical model based on Johansen’s Yield Theory to predict the load-bearing capacity of steel-to-timber connections with screws and profiled nails under shear loading. The model considers the deformed state of fasteners, incorporating four distinct failure mechanisms that explicitly account for the rope effect. Unlike the European Yield Model (EYM) , where the rope effect is empirically defined and attributed to friction between the steel plate and timber at the shear plane, the Extended Model directly integrates the axial forces acting along the fastener into the analytical formulation of each failure mechanism. The proposed model was validated against experimental results from connection tests using profiled nails and screws with various geometries and configurations. The findings reveal that the Extended Model provides a significantly improved prediction of load-bearing capacity compared with the traditional EYM adopted in Eurocode 5 and its revised version.
Ho et al. (Fri,) studied this question.