This paper proposes a new maintenance method for corrosion protection of coastal steel structures. Conventionally, steel structures have been maintained following the regulations and rules based on the past precious experiences and knowledge. However, the reduction of public investment to the social infrastructures encourages more effective maintenance than that of the conventional methods, Authors developed a new and rational maintenance method for coastal steel structures to meet the demand. Especially, preventing the corrosion failure is important for coastal steel structures under severe corrosion environment of ocean. Application of quantitative probability evaluation and extreme value statistics to the maintenance method was investigated in this paper.
