Study of Cyclic Loading Tests of Phosphate Treated High Strength Bolted Friction Joints to Friction Surfaces of Hot Dip Galvanized Coatings

Abstract

We have investigated the slipping characteristics of the hot dip galvanized high strength bolted friction joints with a phosphate treatment, on which a cyclic loading is imposed repeatedly by earthquakes and so on. As a consequence of a series of our experiments, the phosphate treatment has indicated a characteristic more excellent than the blast processing. While the blast treatment makes slipping load increase with the help of pressure, the phosphate treatment has proved favorable without such a phenomenon as seen in the blast counter-parts.