Three corrosion degrees of reinforcement are chosen in this paper, which are considered
to simulate minor, medium and severe degrees of corrosion in this field. A reinforcement mass loss
about 5% is used to define a minor degree of corrosion, whereas mass losses about 10% and 20%
are used to define medium and severe degree of corrosion, respectively. Fifteen specimens of the
three corrosion degrees and seven uncorroded specimens are tested under fatigue. According to the
results of the fatigue tests, using stress range as fatigue parameter and 50% as guaranteed
probability, the fatigue S-N curves of the four different corrosion degrees of deformed
reinforcement adaptable for fatigue reliability evaluation are put forward. These curves provide
necessary principle for predicting the residual fatigue lives of aged existing reinforced concrete
bridges.