Vol. 7, No. 3, pp. 220-238 (2011)
RELIABILITY OF DETERIORATING STEEL BOX-GIRDER BRIDGES UNDER PITTING CORROSION
Yasser Sharifi
Department of Civil Engineering
Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. or This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 17 August 2010; Revised: 31 December 2010; Accepted: 5 January 2010
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ABSTRACT
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.
KEYWORDS
Bridges, Steel box girders, Pitting corrosion, Load-carrying capacity, Time-dependent reliability, Repair and rehabilitation
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