RELIABILITY OF DETERIORATING STEEL BOX-GIRDER BRIDGES UNDER PITTING CORROSION

Deteriorated bridges are subjected to time-variant changes of resistance. Corrosion is one of the most important types of deterioration in steel bridges. The consequence is a reduction in safety of a bridge. Therefore, it is needed to evaluate procedures for an accurate prediction of the load-carrying capacity and reliability of corroded bridges, in order to make rational decisions about repair, renewal or rehabilitation. This paper presents a highway bridge reliability-based design formulation which accounts for pitting corrosion effects on steel box girder bridges. The study involves the idealization of pitting corrosion, development of resistance models for corroded steel box girders, development of load models, formulation of limit state function, development of reliability analysis method, and development of the time-dependent reliability for corroded steel girders. Numerical example illustrates the application of the proposed approach. The results of this study can be used for the better prediction of the service life of deteriorating steel box girder bridges and the development of optimal reliability-based maintenance strategies.

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