抄録
The authors focused on the high strength bolted friction grip joints with countersunk head bolts which can finish the surface of the connection plate flat smoothly and prevent from functional depression due to corrosion. In this study, we have compared the slip strength of the joints which has the optimum countersunk head angle with that of the joint with the normal high strength bolt through the standard slippage test considering variation of plate thickness and the yield strength of the base and splice plates. It was concluded from the experimental result that the slip strength of the joints with countersunk head bolts exceeds the design slip strength specified in JSHB calculated by the slip coefficient 0.45 and that its slip coefficient is about 10% lower than that with normal head bolts. It is caused by that the contact pressure of the joints with countersunk head reduces due to local yielding around the bolt holes.
