Despite the large database of test results on block shear in gusset plates, the exact progression of the failure mechanism is not clear. Although current design equations predict the block shear capacity of gusset plates fairly well, it is important for a design equation not only to predict the capacity reliably, but also to predict accurately the failure mode. Current research at the University of Alberta makes use of a non-linear finite element model to study the block shear behaviour in gusset plates. The model was designed to predict the sequence of events that leads to the tear-out of a block of material from a gusset plate in tension. The model is developed to provide a useful tool to study block shear failure not only in gusset plates, but also in other members such as coped beams. This thesis presents the development of the finite element procedure for prediction of block shear failure in gusset plates and presents an assessment of several design equations for block shear in gusset plates. A limit states design equation that predicts well the observed failure mode and provides an adequate level of safety is proposed.
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