EXPERIMENT ON HIGH STRENGTH BOLTED JOINTS TREATED WITH ZINC-RICH PAINT UNDER 15%-ADDITIONAL BOLT AXIAL FORCE

Abstract

 It is known that high strength bolted joints treated with zinc-rich paint have a characteristic of large bolt axial force loss by relaxation. In this study, the friction type of high strength bolted connection specimens were made on steel plates, in which contact surfaces are to be rough without mill scale and have inorganic zinc-rich paint, then slip tests and relaxation tests were carried out on these specimens. From these results, we discussed the applicability of high strength bolted joints treated with zinc-rich paint under 15%- additional bolt axial force.