This paper aims to clarify effects of beams on full plastic strength of circular hollow section panel zones in beam-column subassemblies. We categorized the effects as following two factors; [a] reduction of shear force at both ends of panel zone due to resistance of beams, and [b] restraint of out-of-plane deformation and reduction of axial force of panel zone by beams. The contributing ratios of the individual effects were evaluated quantitatively based on finite element analysis of cruciform subassemblies and simple panel zones varying panel aspect ratio, axial force ratio of the column, input direction, and so on.
