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In this study, a damage model‐based fatigue behavior is proposed. To consider the fatigue behavior of steel in the damage model, the experimental research on reinforcing steel bar grades HRB400 was presented. The monotonic tension test and low‐cycle fatigue test were carried out. The plastic strain amplitude–fatigue cycle (εp–2Nf) curve and plastic strain amplitude–strength loss factor (εp–ϕSR) curve...