Estimation of Early Corrosion Mechanism on the Upper Surface of Wire Ropes in Suspension Bridges

Abstract

This study is focused on the heterogeneous corrosion phenomenon of the general segment of suspension bridge main cables in mountainous/plain areas, specifically focusing on the uppermost surface. The primary objective of this research is to elucidate the corrosion mechanism by investigating the corrosion environment and performing corrosion acceleration tests using simulated ropes. Consequently, it has been revealed that during the summer season, the surface temperature of the rope reaches approximately 65°C, corresponding to the zenith of zinc corrosion rates. Moreover, in the upper surface of the rope, which is particularly susceptible to the influence of solar radiation, it has been disclosed that condensation occurs as a non-rainfall-related factor, creating an environment conducive to condensation. These factors suggest that the moisture supplied to the upper surface and the residue of corrosive elements exert an influence on the skewed corrosion mechanism of the rope surface.