PILOT EXPERIMENTS FOR DEVELOPMENT OF FAYING SURFACE TREATMENT OF HIGHSTRENGTH FRICTIONAL TYPE BOLTED JOINTS TO IMPROVE ITS AFATER-SLIP RESISTANCE

Abstract

Bolted joints of prominent-size members require many bolts because the slip and after-slip resistance decrease proportionally to the number of bolts. Unevenness of the load transfer ratio and shear deformation of each bolt should be solved to utilize all bolt’s strength and make the large-size joint compact. A countermeasure we developed is the application of a new faying surface treatment composed of polyurea resin and nickel mesh. This paper conducts a pilot tensile tests of coupon specimens applied with the treatment to investigate whether it contributes to mitigate the unevenness. The obtained results indicate that the treatment enhance shear deformation capacity of faying surface and equalize the load transfer ratio of bolts.