This paper reports an experimental test of 18 double-angle knife shear connections. Each specimen was
monotonically loaded to failure under a combined shear load and rotation. In addition to the anticipated
failure mode of rupture of welds, rupture of angles was also commonly observed. It is found that the strength
of Welds B can be determined accurately by the instantaneous center of rotation method when the shear load
eccentricity in the plane of the welds is taken as one-half of the leg width. The load eccentricity is not dependent
on welding procedure. The test results reveal that the current U.S. design method for Welds B is
extremely conservative. The failure mode of the rupture of the angles always occurred at the top of the angles
along the edge of the welds. This failure is due to the combined action of connection rotation and shear load