Abstract: FRP bars can effectively solve the corrosion problem of steel reinforcement in ordinary concrete beams, but the shear failure of FRP-reinforced concrete beam is brittle failure and the shear ductility is small. In this paper, the regional restraint technology is applied to BFRP-reinforced concrete beams, and BFRP-reinforced stirrups are used to restrain the concrete in the shear compression zone. Through the shear comparative test of one blank beam and four restrained beams, the influence laws of spiral stirrup ratio and shear span ratio of restrained spiral stirrups on the ultimate load, failure mode and ductility of the beam are studied. The research shows that the shear ductility of the beam analyzed by equivalent energy method and displacement ductility coefficient method has been significantly improved, and the addition of regional confined stirrups changes the failure mode of the beam, and the shear bearing capacity decreases with the increase of shear span ratio.

Key words: concrete beams with regional constraints, BFRP bars, shear deformation, ductility