INVESTIGATION OF TORQUE COEFFICIENTS AND MECHANICAL PROPERTIES ON HIGH STRENGTH HEXAGON BOLTS OF 22 mm DIAMETER

Abstract

 High strength hexagon bolts are widely used to bolted joints in steel bridges. It is known that their bolts vary widely of torque coefficients. However, characteristics of torque coefficients not clarified. In this paper, we have investigated the 4815 of torque coefficients on the basis of the mill sheet data and bolt-tightening tests data in order to clarify torque coefficients on high strength hexagon bolts of 22 mm diameter. We also have investigated the mechanical properties of their bolts.