Single-bar early warning device and ductility control method for prestressed FRP reinforcement structure

Abstract

The invention discloses a single-bar early warning device and ductility control method for a prestressed FRP reinforcement structure. The device comprises a fixing plate, an FRP strip, a self-lockingplate, an anchoring plate, a tensioning screw with an early warning function, multiple nuts and expansion bolts. The fixing plate and the anchoring plate are located on both sides of the self-lockingplate, the two ends of the FRP strip are fixedly connected with the fixing plate and the self-locking plate respectively, the tensioning screw penetrates through the self-locking plate and the anchoring plate, and large plastic deformation of the tensioning screw occurs when the structure is overloaded to achieve a safety early warning function of the structure; the nuts are in threaded connectionwith the tensioning screw and are used for locking both sides of the self-locking plate and locking both sides of the anchoring plate, the expansion bolts are used for fixing the fixing plate, the self-locking plate and the anchoring plate to concrete, and long circular through holes in the self-locking plate are used for mounting the expansion bolts and formed in parallel with the tensioning screw. Compared with the prior art, the device and the method have the advantages that not only are the ductility and rigidity of the components improved, but also the early warning function is achievedwhen the structure is overload, and the safety of the components is improved.

Description

technical field [0001] The invention relates to the technical field of FRP reinforced concrete structures, in particular to a single-rod early warning device and a ductility control method of a prestressed FRP reinforced structure. Background technique [0002] With the development of concrete structure reinforcement technology, the excellent performance of FRP (Fiber Reinforced Polymer / Plastic) is well known by more and more people, and FRP reinforced concrete structures are also favored by more and more people. [0003] However, there are significant shortcomings in the current FRP prestressed reinforced concrete structure: (1) poor ductility, although the bearing capacity is improved compared with ordinary concrete members, but the ductility is reduced to a certain extent, and there is no early warning of damage; (2) FRP When the prestressed fiber cloth is prestressed, the carbon fiber plate and the anchorage tend to slip relative to each other. As the stress continues to...

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Problems solved by technology

[0003] However, there are significant shortcomings in the current FRP prestressed reinforced concrete structure: (1) poor ductility, although the bearing capacity is improved compared with ordinary concrete members, but the ductility is reduced to a certain extent, and there is no early warning of damage; (2) FRP When the prestressed fiber cloth is prestressed, the carbon fiber plate and the anchorage tend to slip relative to each other. As the stress continues to increase, the carbon fiber is separated from the anchorage, and the prestressing force fails, which cannot be achieved. Due reinforcement effect; (3) Tension anchoring device has heavy structure, complex process, high technical requirements, high cost, and cannot be reused

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