Fatigue Reliability of Prestressed Concrete Bridgesby A. S. Nowak, Univ of Michigan, United States,
R. Al-Zaid, Univ of Michigan, United States,
Abstract: Experimental studies indicate that fatigue is a random phenomenon. Therefore, the approach is based on probabilistic methods. The fatigue life of the prestressed concrete girder is estimated from the fatigue properties of its components and corresponding load spectra. The model utilizes the available S-N curves for structural materials and Miner's rule to evaluate the fatigue life under variable amplitude loading. Fatigue load spectra and stress ranges are calculated for a typical indicate a large variation in load distribution to girders. Stress spectra for prestressing strands do not exceed 2 percent of the ultimate strength of steel.
Subject Headings: Concrete bridges | Load distribution | Load factors | Fatigue life | Prestressing | Girder bridges | Lifeline systems
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