Numerical stimulation of time-dependent corroded surface of structural steel members in boundary with concrete

In order to investigate the time-dependent corrosionbehavior for the steel structural members in boundary with concrete, accelerated exposure tests were carried out on model specimen in the authors' previous study. However, long-term corrosion tests over several years is required to clarify the corroded surface corresponding to surface period of actual steel structure. In this study, the corroded surface of tested specimens were analyzed using regression trees and variograms to make the time-dependent corroded surface models. Numerical stimulation using referential spatial statistics were also carried out on the models to estimate the corroded surfaces corresponding to the service period. From these analytical results, a prediction method for the remained plate thickness and a period of penetrating through a part of the members by the localized corrosion was proposed.