Moment-Shear Interaction in Plate Girders

AASHTO and AISC specifications had adopted Basler’s interaction equation. AASHTO LRFD specifications, however, have completely neglected the interaction effect of bending on the shear strength since the 3rd edition in 2004. AISC LRFD specification followed suit from the 13th edition in 2005. In this study, revisited are the interaction equations specified in design codes that were developed for bare-steel sections. The interaction effect in composite sections was also investigated. It was found that neglecting the interaction could lead to unsafe designs when shear buckling is not associated web failures. The interaction should not be neglected when web failures are governed by yielding due to combined bending and shear regardless of whether sections are composite or noncomposite.

View content