Distributed self-monitoring pre-stressed composite rib based on long-scale-distance fiber grating

Abstract

The invention discloses a distributed self-monitoring pre-stressed composite rib based on a long-scale-distance fiber grating, comprising a core composite rib body, a plurality of sections of fiber protection tubes are arranged outside the core composite rib body in a sleeving mode, and anchoring area resin coatings are arranged between the fiber protection tubes; the long-scale-distance fiber grating is wound on the core composite rib body and is positioned between the core composite rib body and the fiber protection tubes; and a composite rib shell is arranged outside the fiber protection tube. The self-monitoring composite rib can be applied to a common concrete structure and a pre-stressed concrete structure, high-precision monitoring of the rib material and the structure is achieved,the long-term durability and safety of the structure are enhanced, the reliability of the structure in a normal use state is improved, and the maintenance cost of the whole service life of the structure is reduced.

Description

technical field [0001] The invention relates to the technical field of intelligent structural materials and sensor monitoring, in particular to a distributed self-monitoring prestressed composite tendon based on long-gauge fiber gratings. Background technique [0002] Continuous fiber reinforced polymer composites (Fiber Reinforced Plastic, FRP) have the advantages of high strength, low weight, and corrosion resistance. At present, they are gradually used in reinforced concrete structures to replace traditional steel bars, and are used in harsh and complex environments such as marine environments. . Current research mainly focuses on carbon fiber, glass fiber, aramid fiber and basalt fiber, but except for carbon fiber, the elastic modulus of other fiber materials is too low to directly replace steel, and it is difficult to use the characteristics of the material in the structure. Therefore, in order to overcome this shortcoming, composite materials usually appear in the for...

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Problems solved by technology

[0004] However, the ultimate strain of the general distributed long-gauge fiber grating sensor is only 8000με, and the pre-tensioning strain of the composite rib generally reaches about 8000με after prestressing, so that only the composite rib cannot be used in the structure with prestressing, otherwise the sensor will be damaged. Destruction ahead of time, which limits the use scenarios and cannot take advantage of the performance advantages of composite materials

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