A steel-fiber-reinforced polymer (FRP) composite bar (SFCB) is a kind of rebar with inner steel bar wrapped by FRP, which can\nachieve a better anticorrosion performance than that of ordinary steel bar. The high ultimate strength of FRP can also provide\na significant increase in load bearing capacity. Based on the adequate simulation of the load-displacement behaviors of concrete\nbeams reinforced by SFCBs, a parametric analysis of the moment-curvature behaviors of concrete beams that are singly reinforced\nby SFCB was conducted. The critical reinforcement ratio for differentiating the beam�s failuremode was presented, and the concept\nof the maximum possible peak curvature (MPPC) was proposed. After the ultimate curvature reached MPPC, it decreased with an\nincrease in the postyield stiffness ratio (
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