Experimental study on slipping capacity of high-strength countersunk head bolted frictional joints with single frictional surface

Abstract

This study experimentally investigated the effects of joint specifications and surface treatment methods of countersunk parts on the slip resistance of single-surface frictional joints using countersunk high-strength bolts with a head opening angle of 92◦. The results showed that the slip coefficient of countersunk bolts was higher than that of high-strength hexagonal bolts, and the slip coefficient remained unchanged even when rust-proof painting was applied to the countersunk parts. Additionally, it was found that using enlarged holes improved the slip coefficient by 3% to 7%. Furthermore, there was a tendency for the slip coefficient to decrease and its variation to increase when the slip-to-yield strength ratio was high.