A theoretical fatigue life prediction method has been proposed for RC bridge slabs which fail in a punching shear mode undercyclic moving loads. The method was established focusing on the propagation of punching shear cracks in a critical RC beamsimplified from an RC slab. Concrete bridging degradation and bond slip degradation were considered as the source of crackpropagation. From this method, fatigue life of RC bridge slabs were predicted for several loading levels. Comparisons betweenmethod predictions to results from experiment and some existing empirical life prediction equations indicated a goodagreement which confirmed the applicability and reliability of the proposed method.
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