ABSTRACT
The paper focuses on the residual slip resistance of high strength bolted friction joints in aged steel bridges. It was found in the preliminary investigation of existing steel bridges that there are some high strength bolts with the residual bolt axial force much lower than the de-signed bolt axial force, and that the bolt axial force variation is quite large. In this study using a steel highway bridge that has served for 34 years and demolished, the residual bolt axial force of high strength bolt friction joints is investigated. As a result, except for some parts, the residual axial force and slip coefficient of the high-strength bolt exceeded the design values, indicating that the joint of more than 30 years of age has sufficient strength. Therefore, it was found that there was no correlation between the residual axial force of the high-strength bolt and aging.
