This investigation is concerned with beam-to-column moment connections that are proportioned to resist a combination of high shear force and plastic moment of the beam section.A theory based upon mathematical models and physical models is developed to predict the over-all load-deflection behavior of connections.In the analysis, it is assumed that the bending moment exceeding the yield moment of the beam section is carried by flanges due to strain-hardening, and the shear force is resisted by the web. The deformation of the connection panel zone is considered.Predictions by current plastic analysis and a finite element analysis are also included for comparison.