United States Department of Transportation
i
Effects of Corrosion and Fatigue on the Load-Carrying Capacity of Structural and Reinforcing Steel
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1994-03-01
[PDF-3.76 MB]
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TRIS Online Accession Number:00675195
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Edition:Final Report July 1991 - February 1994
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Abstract:Pitting and crevice corrosion have profound effects on the fatigue life of structural and reinforcing steels used in bridge construction. Stress concentration factors were measured on actual corroded plates with strain gage instrumentation. Using corrosion rates and pitting ratios for immersion, intermittent immersion and various atmospheric environments from the corrosion literature, a unified equation for corrosion fatigue of structural steels, N = C/kf[Scorr]m is proposed to determine the number of stress cycles to significant crack formation. The coefficients C, kf and m were determined in this investigation. Collected strain data is used to construct a stress-frequency histogram for a bridge, which establishes an accurate and rapid assessment of traffic damage. The linear damage rule is then used to integrate the simultaneous action of both mechanical fatigue and gradual surface degradation, and is combined with sectional loss from corrosion. The predictive equations developed in this report are very useful in the determination of load-carrying capacity and fatigue damage of bridges. These factors are integral to the planning of improvements and maintenance, the granting of overload permits, and for maximum load rating of bridges.
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