Experimental study of block shear failure of angles in tension

Abstract

This study was conducted to see if the block shear failure of angles in tension is substantially different from that of beam web-to-column connections. The results of this study have demonstrated this as well as showed some shortcomings in the AISC code equations that were based on the beam web studies. The effect of several of the parameters in the connection geometry was investigated. The eccentricity inherent in the loading of these angles was shown to be a significant factor in their failure. Eccentricity accounted for the role that the length of the unconnected, outstanding leg played in the failures. The primary conclusion of this study is the need for modifications in the AISC code treatment of block shear. The proposed inclusion of the shear lag reduction coefficient U for the tension area appears to produce appropriate results. The extension to structural shapes other than angles, structural tees, for instance, is a subject that will require further investigation. However, based on the inherent bending associated with any tension member having U < 1, it seems reasonable that the proposed code treatment should be appropriate and conservative for other shapes as well.