This study indicates the influence of the prying action on Web bolted moment joints of aluminum alloy beams and splice plates. In this joints, the gap can be rather narrow between the beam flange and the splice plate side edge because of aluminum extrusion. Web bolted moment joint can transmit the bending moment by bearing of the bolts and the prying action between the beam flange and the splice plate side edge. The bending moment of prying action is neglected usually. In this paper, it is clarified experimentally and analytically that the bending strength ratio of prying action reaches to 60%-90% for the maximum bending strength. After each experiment, the phenomenon of tensile or punching shear fracture has been observed at web or flange portion of beam in a specimen.
