The Truss Plate Institute (TPI) published a methodology for designing metal plate connected wood truss joints for moment in 2002. Subsequent use and further research showed the need for modification of this method to recognize the interaction between axial compression and moment stresses and to recognize the effect of plates located off-center. This article reports on further development of this methodology, including consideration of wood compression capacity due to direct contact, consideration of steel yielding and plastic behavior in tension, consideration of steel buckling capacity in compression, correlation of the predictive equations with test data, and further modification for design application. These equations permit reasonably accurate establishment of allowable moment capacities across the full range of axial loadings of truss joints, from full allowable compression loading to full allowable tension loading.
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