Effects of connection geometry on block shear failure of welded lap plate connections

Although block shear failure has predominantly been considered a potential failure mode for bolted steel connections, several recent experimental programs have revealed that block shear can also govern the design of certain arrangements of welded connections. The mechanics of block shear failure in welded connections are known to be different from the bolted case, although published research on the subject is limited. A nonlinear finite element model has been developed to study the capacity of concentrically loaded welded lap plate connections that fail in block shear. The accuracy of the model was verified by comparing analytical results to those from physical tests. A parametric study was then completed to quantify the effects of connection geometry and weld arrangement. The results of the study are used to describe the behaviour of welded lap plate connections failing in block shear and to evaluate the performance of block shear design equations for capacity prediction of welded connections with a variety of geometries.

Research highlights
► Block shear has been shown to govern the design of certain welded connections.
► Mechanics of block shear in welded connections are different from the bolted case.
► A nonlinear finite element model has been developed to study these connections.
► A parametric study was completed to quantify the effects of connection geometry.
► The results are used to describe behaviour and to evaluate design equations.