The aim of this study is to examine the corrosion behavior of friction plate surfaces connected by high-strength bolts under severely corrosive environments in steel bridge structures. The corrosion behavior was inspected using corroded specimens cut from a steel girder bridge that collapsed after severe corrosion for 28 years. Visual inspection and measurement of the corrosion thicknesses of the inner surfaces were performed. The arithmetic average roughness was also measured to evaluate the friction coefficient. From these investigations, it may be clear that the aging deterioration of the friction surfaces of joint plates connected by high-strength bolts is has little influence over the slip strength. The details of conducting investigations and their results are presented in this paper.
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