Wide-range FRP (fiber reinforced plastic) embedded steel wire composite optical fiber smart rebar and preparation method thereof

Abstract

The invention discloses a wide-range FRP (fiber reinforced plastic) embedded steel wire composite optical fiber smart rebar and a preparation method thereof. The wide-range FRP embedded steel wire composite optical fiber smart rebar comprises a steel strand, optical fibers or fiber bragg gratings as well as a wrapping layer made of FRP, wherein the steel strand is arranged in the center of the wide-range FRP embedded steel wire composite optical fiber smart rebar, the optical fibers or the fiber bragg gratings spirally wind around the steel strand in the length direction of the steel strand, and the outer side of the optical fibers or the fiber bragg gratings is coated with the wrapping layer. The wide-range FRP embedded steel wire composite optical fiber smart rebar and the preparation method thereof have the advantages of engineering, high modulus and shear resistance, can meet a wide-range monitoring requirement and are suitable for large-scale popularization.

Description

technical field [0001] The invention belongs to the technical field of structural health monitoring and structural materials, and in particular relates to a large-scale FRP embedded steel wire composite optical fiber smart tendon and a preparation method thereof. Background technique [0002] Corrosion resistance of structural materials and structural health monitoring have always been important research and development directions in the field of civil engineering. Fiber Reinforced Polymer / Plastic (FRP) is more and more widely used in the field of civil engineering due to its excellent corrosion resistance, light weight, high strength, non-magnetism, and small thermal expansion coefficient. However, FRP materials have the disadvantages of low modulus, low shear strength, and brittle failure, which severely limit their further promotion. In the patent document whose patent number is CN200610009936.6, and the patent name is: fiber-reinforced plastic-steel strand composite bar...

AI Technical Summary

Problems solved by technology

In the patent document with the patent number CN201010623698.4 and the patent title of FRP fiber optic intelligent composite bar embedded with steel strand, it announced the embedded steel strand obtained by compounding the fiber optic sensor with the fiber-reinforced plastic steel strand composite bar FRP fiber optic smart composite tendons, but the optical fiber sensors in the smart ribs are arranged in parallel with the fibers in the FRP material, the strain of the smart ribs is equal to the strain of the optical fiber sensors, and the ultimate strain of the optical fiber sensors is smaller than the ultimate strain of the FRP material, that is, in Under stress, the fiber optic sensor fails before the FRP ribs are damaged, which will directly cause the overall ultimate strain of the smart ribs to be limited by the ultimate strain of the fiber optic sensor

The ultimate strain of the fiber optic sensor is only 1×10 4 με, which cannot meet the needs of large-scale monitoring, this shortcoming directly limits the application of smart tendons in civil engineering

Images