ULTIMATE SHEAR STRENGTH OF HIGH STRENGTH BOLTS

Abstract

In many bolted connections the fasteners are subjected to shear loading. The objective of this study was to determine the behavior of single high-strength bolts under static shear loadings. A total of 75 A354 BC,A3.54 BD andA490 bolts were tested in jigs made of A440and constructional alloy steel. In addition, 72 A325 bolts were tested, 66 in A7 steel jigs and 6 in A440 steel jigs.- The effect of a number of variables upon the ultimate shear strength and deformation at ultimate load was studied. The vari.ables were internal bolt tension, location of the shear planes, condition of the faying surfaces, bolt grade and diameter, connected materi.al, grip and loading span, end restraint in the tension jigs, and type of test- ing device. The only variables which significantly affected the ulti- mate shear strength were the location of the shear plane, the grade of bolt, and the type of testing device.