Abstract: In order toprobe the shear performance of annular stiffener node in spatial structure ofconcrete filled steel tube (CFST) column-steel beam, the finite element models of circular and square spatial annular stiffener node were establishedunder three different loading modes on beam end by means of finite element software ABAQUS and the dependence of shear in node domain on displacement of beam end was analyzed. On this basis, four parameters that would affect the anti-shear performance of the node domain were selected and analyzed, so that the shear mechanism of spatial steel tube concrete node was clarified thereby. The result showed that the sequential loading at beam end in plane or out plane would make the shear performance of node domain mostunfavorable, the strength of steel beam, concrete column, and steel tube would be beneficial to the anti-shear performance of the node domain, and the axial compression ratio would be advantageous in a certain range, but more than that, the case would be opposite.

Key words: outer annular-stiffener, concrete filled steel tube column, spatial node joints, shear performance