MECHANICAL BEHAVIOR OF COUNTERSUNK HEAD HIGH-STRENGTH BOLTED SINGLE FRICTIONAL JOINTS WITH COUNTERSINKING BOLT HOLE IN MAIN PLATE

Abstract

Previous studies have been conducted on double frictional joints using high strength countersunk head bolts, including bolt head opening angles and torshear type high strength bolt. In order to further improve the pavement durability and field workability of steel deck plates, the use of high strength countersunk bolted single frictional joints with countersinking bolt hole in main plate is required. In this study, FE analysis simulating slip tests was conducted to evaluate the effects of bolt type, connecting plate thickness, and connecting plate configuration on the slip strength. The slip strength of the single frictional joint was primarily influenced by the bolt axial force reduction of the inner bolt. The high strength countersunk bolts exhibited a smaller yielding range of the hole wall during tightening and a lower axial force reduction rate compared to high strength bolts. As a result, the slip coefficient of the high strength countersunk bolts was higher than that of the high strength bolts.