EVALUATION OF LONG-TERM BEHAVIOR OF BOLT AXIAL FORCE AND SLIP COEFFICIENT IN HIGH-STRENGTH BOLT FRICTION JOINTS BETWEEN GFRP PLATES AND STEEL PLATES

Abstract

 In this study, we conducted a basic research aimed at designing an efficient friction bond between a GFRP plate and a steel plate. We have developed a screening method (slip tendency test) that allows easier experimental investigation of the effect of surface treatment on static friction force of joint surfaces and conducted friction welding joint tests on three test cases selected using the screening method. The highest slip coefficient was obtained in the case where the GFRP plate side and the steel plate side were coated with inorganic zinc rich paint.

 From the perspective of relaxation behavior, it is suggested that it may be efficient to input a larger bolt axial force during pre-tightening than the bolt axial force during main tightening.