抄録
In order to examine the slip resistance of the friction type of high strength bolted connections with rusted contact surfaces, tensile tests on the model specimens and observation on the rust have been performed. The steel used is SM490Y. Their surfaces have been treated by grid blast or disk grinder. Then they are exposed near or far from seashore in a period of 0, 2, 4 or 6 months. Test results indicate that quantity of rust is gained with increase in exposure period, significant in the location near seashore and does not depend on the ground treatment for steel. The slip factor is independent of the amount of rust if some quantity of rust covers the steel. The value of the slip factor for the connection with rust surface is over 0.73 in average though the slip factor of the connections without rust is 0.46 or 0.28 when the steel surface is treated by grid blast or disk grinder.
