FRP bellow-reinforcing composite bar

Abstract

The invention discloses a FRP bellow-reinforcing composite bar. The FRP bellow-reinforcing composite bar includes a FRP bellow, a ribbed steel bar and a bonding material, wherein a gap between the FRPbellow and the reinforcing steel bar is filled with the binding material. According to the FRP bellow-reinforcing composite bar, the internal ribbed steel bar and the external FRP bellow are solidified through the binding material to form the composite bar, and the composite bar has good corrosion resistance; when the composite bar is tensed, the FRP bellow and the ribbed steel bar are subjectedto large tensile deformation in the axial direction together, and the defect that strain at break of FRP materials is small is overcome; the composite bar has good shear strength, the defect that theshear strength of a pure FRP bar is low is overcome; a corrugated structure of the FRP bellow helps to achieve good bonding performance between the internal steel bar and external concrete; the composite bar has good bending performance, and the corrugated structure of the FRP bellow avoids that outer side fibers are broken during bending of a steel bar; and the structure is simple, the performance is excellent, and the FRP bellow-reinforcing composite bar can be widely applied to a load-bearing steel bar in a civil engineering structure of a corrosive environment.

Description

technical field [0001] The invention belongs to the field of civil engineering structures, in particular to an FRP corrugated pipe-steel bar composite bar. Background technique [0002] my country is carrying out large-scale infrastructure construction, and the infrastructure construction in the central and eastern regions is relatively complete. The infrastructure construction center is gradually shifting to the west, south and offshore areas. In recent years, the East China Sea Bridge, the Hangzhou Bay Bridge and the Hong Kong Cross-sea projects such as the Zhuhai-Macao Bridge, offshore and even deep-sea projects are important construction tasks in the future. The biggest problem encountered in civil engineering construction in marine and other corrosive environments is corrosion. The corrosion of reinforced concrete components cannot be ignored, and it is also a key problem that is difficult to solve. How to ensure the anti-corrosion and durability of offshore or even dee...

AI Technical Summary

Problems solved by technology

According to the curves in the figure, OAFB is the F-l curve of ordinary ribbed steel bars, OC is the F-l curve of FRP bars, and ODECH is the F-l curve of FRP-wrapped ribbed steel bars proposed by the prior art. It can be seen from the figure that the prior art proposed FRP-wrapped ribbed steel bars form a composite bar that stretches and deforms together with the steel bar from the initial stage, but the FRP material breaks when the tensile strain is small, and the protective effect of the FRP on the steel bar disappears after the fracture, and the bearing capacity of the composite bar suddenly decreases. Unfavorable to the stress of the composite reinforcement structure

At the same time, due to the small breaking strain of FRP bars, when the composite bars proposed in the prior art are bent, the fibers on the tension side break early, and the protection of the steel bars at the bends becomes invalid.

Images