Rolling Shear Failure of Plywood in Structural Components

摘要

A mathematical model for the failure of rolling shear plywood connections has been proposed and verified experimentally. It assumes that failure is triggered by longitudinal shear failure of the face ply. It is found that allowable stresses depend upon the width of the area of contact, decreasing with it. For widths of dimension lumber, however, the allowable stresses currently recommended are too conservative and could be increased. A new test assembly, which stimulates the structural behaviour of plywood in a rolling shear connection, has been proposed and used to test the mathematical model. It is proposed that this test, and not the standard shear test, be used to assess the strength of plywood in structural applications involving rolling shear. (Author)