| In this paper, a primary study on fatigue behaviors of strengthening corroded RC beams using non-prestressed aramid fiber reinforced polymer (AFRP) sheets and prestressed AFRP sheets with permanent anchor was carried out. Based on the fatigue experimental results, the effects of different pre-stress level of AFRP sheets under different ratio of corrosion (moderate corroded: reinforcement mass loss is 6.0%, severe corroded: reinforcement mass loss is 12%) on the properties of the fatigue failure, fatigue life and mid-span deflection were analyzed. The experimental results showed that, the fatigue failure mechanism of the corroded RC beams strengthened with AFRP sheets is the fatigue fracture of steel bar. Comparing between the beams strengthened with prestressed AFRP sheets and the beams with non-prestressed AFRP sheets, the fatigue life was increased. The fatigue life of the retrofit RC beams increased with the increase of the pre-stress level of AFRP sheets. Pitting resulted in a geometry that increased the stress concentration factor, this led to the significant reduction observed in the fatigue life. And the fatigue life of the corroded RC beams decrease with the increase of the ratio of corrosion. The fatigue results were compared to smooth specimen fatigue data to estimate an equivalent fatigue notch factor K f for the main reinforcing bars of the tested specimens. Pitting corrosion resulted in the increase in the fatigue notch factor, this increase resulted in a significant reduction in the fatigue life. Based on experimental study,this paper gives the"S-N"curve of the moderate corroded reinforcement, and it can be a reference for factual projects design.
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