A reliability-based durability design specification for chloride penetration to prevent reinforcement corrosion in concrete structures

초록

Reinforced concrete bridges in marine environment are becoming longer and bigger. The corrosion of reinforcement in the concrete members due to chloride ion generally plays an important role in a durability service life of the structure. Thus, reasonable durability design for the marine bridges against chloride penetration should be taken. The previous method of durability design against chloride penetration has performed in a deterministic way. Real physical properties for chloride penetration, however, have variability around their means. Therefore a probability-based approach of durability design is required. A reliability-based design specification for long-span marine bridges has recently been proposed. The specification includes a durability design of concrete members against chloride penetration to prevent reinforcement corrosion. This paper aims the introduction of the durability design specification. The specification is composed of presenting limit state equations, drawing the statistics for many probability variables, establishing durability design procedure, and describing a verification method. A durability design example according to the guideline for a prototype marine bridge is explained at the end of this paper. The specification can be expanded to the durability design for many other types of concrete structures under chloride penetration environment.