In order to reasonably determine the remain fatigue life of existing corroded RC bridges,high-cycle fatigue tests were performed on eight corroded reinforced concrete(RC) beams,and the fatigue behavior of RC beams with corroded main reinforcing steel bars were investigated.The test results indicated that the diagonal cracks of specimens emerged and developed quickly under the alternate loads, finally became the main cracks.Most simulate corrosion RC beams appeared shear fatigue failure near the end. The deflection development and crack distribution of specimens were closely related with failure models. With the increase of cycle numbers,the maximum and minimal stresses of corrosion main reinforcement increased gradually, and the stress amplitudes changed little. The maximum and minimal compressing strain of concrete developed quickly, and the strain amplitudes increased stably. The fatigue life of specimens had more discreteness, and the fatigue life of the corroded RC beams was longer than that of natural corrosion reinforcing steel bars subjected to axial tensile fatigue loads under the similar corrosion and stress conditions.
