Research on mechanical property and hybrid effect of CGFRP bar

When one fiber such as CFRP bar, GFRP bar is stretched, stress-strain curve is always presenting linear change without obvious yielded stage, therefore, FRP bar concrete structure is not as good ductility as reinforcing concrete structure. Mixing more than two fibers comes into being high performance reunited bar, which gets to good performance through controlling the comparison of every fiber bar. It can guarantee tensile strength, and its stress-strain curve can come yielding stage similar to the reinforcing bar. It can effective improve the tenacity of FRP bar. According to hybrid effect theory of composite material, this treatise conducts analytical research to hybrid mode and hybrid effect of FRP bar, putting forward computational methods for fiber critical volume, stress-strain curve, tensile strength and elastic modulus for positive hybrid effect of CGFRP bar. In the promise of guaranteeing performance in service, putting forward train of thoughts of design for CGFRP bar, it has supplied an efficient path to conduct ductility design for FRP bar concrete structure and heightening safety of structure.