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Coupled fatigue-corrosion is more detrimental for reinforced concrete bridge deck slabs than either of fatigue or corrosion occurs separately.The main objectives of this study is to obtain a further under-standing of the deterioration mechanism and failure modes of reinforced concrete bridge deck slabs subjected to coupled fatigue-corrosion.The joint inter-action between chloride-induced steel corrosion and fatigue cracking of concrete were analyzed.The effects of fatigue cracking on chloride diffusion pro-cess,and the influences of internal forces redistribution due to steel corrosion on reinforcement fatigue stress range were studied.Based on the coupled fatigue-corrosion damage mechanism,two fracture failure modes of concrete bridge decks were pro-posed and the corresponding limit state functions were deduced.Finally,the performance assessment of an illustrative example showed that coupled fatigue-corrosion effects obviously reduced the fatigue life of reinforced concrete bridge deck slabs.It is concluded that the effects of coupled fatigue-corrosion should not be neglected in the fatigue safe-ty design of reinforced concrete bridge decks.