Concrete　structures　such　as　bridge　decks　and　road　pavements　are　subjected　to　repetitive　loading　and　are　susceptible　to　fatigue　failure.　A　simplified　stress-strain　analysis　method　that　can　simulate　concrete　behavior　with　a　sound　physical　basis,　acceptable　prediction　precision,　and　reasonable　computation　cost　is　urgently　needed　to　address　the　critical　issue　of　high-cycle　fatigue　in　structural　engineering.　An　equivalent　fatigue　constitutive　model　at　discrete　loading　cycles　incorporated　into　the　concrete　damaged　plasticity　model　(CDPM)　in　Abaqus　is　proposed　based　on　fatigue　damage　evolution.　A　damage　variable　is　constructed　from　maximum　fatigue　strains,　and　fatigue　damage　evolution　is　described　by　a　general　equation　whose　parameters＇　physical　meaning　and　value　range　are　identified.　With　the　descending　branch　of　the　monotonic　stress-strain　curve　as　the　envelope　of　fatigue　residual　strength　and　fatigue　damage　evolution　equation　as　shape　function,　fatigue　residual　strength,　residual　stiffness,　and　residual　strain　are　calculated.　The　equivalent　fatigue　constitutive　model　is　validated　through　comparison　with　experimental　data,　where　satisfactory　simulation　results　were　obtained　for　axial　compression　and　flexural　tension　fatigue.　The　model＇s　novelty　lies　in　integrating　the　fatigue　damage　evolution　equation　with　CDPM,　explicitly　explaining　performance　degradation　caused　by　fatigue　damage.　The　proposed　model　could　accommodate　various　forms　of　concrete　constitution　and　fatigue　stress　states　and　has　a　broad　application　prospect　for　fatigue　analysis　of　concrete　structures.