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The paper analyzes the fatigue strength of steel sampled from a railway bridge with a service life of over hundred years. The fatigue strength of the material was used to analyze the structural capacity of this railway bridge with such life expectancy operating under variable cyclic loading. The assessment was made using the requirements of the current design codes. It was found that the load-bearing capacity of structures made of materials similar to the analyzed steel may decrease significantly. In case of railway bridges and viaducts made of puddled steel with a service life exceeding 100 years, a significant reduction in the fatigue strength under normal stress is expected. Under shear stress, however, a significant excess of fatigue strength is predicted.
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P. Kossakowski (2013) studied this question.
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