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FRP (fiber reinforced polymer) rebar anchoring clamp piece, manufacturing method thereof and anchoring method thereof

An anchoring method and clip technology, applied in the direction of building reinforcements, structural elements, building components, etc., can solve the problems of lateral shear damage and stress concentration of FRP bars, avoid lateral shear damage and reduce the size of anchors , the effect of convenient construction

Active Publication Date: 2019-05-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When clip-type anchors are used to anchor FRP tendons, the clips in the anchorage area will produce transverse extrusion deformation on the FRP tendons, and stress concentration will occur at the loading end of the clip-type anchors, which will easily cause the transverse shear failure of FRP tendons first. in tensile failure

Method used

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  • FRP (fiber reinforced polymer) rebar anchoring clamp piece, manufacturing method thereof and anchoring method thereof
  • FRP (fiber reinforced polymer) rebar anchoring clamp piece, manufacturing method thereof and anchoring method thereof
  • FRP (fiber reinforced polymer) rebar anchoring clamp piece, manufacturing method thereof and anchoring method thereof

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Experimental program
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Embodiment 1

[0041] see figure 1 with figure 2 As shown, the anchorage structure for prestressed FRP tendons of the present invention includes variable stiffness clips and anchor cups 4, wherein the clips are integrally formed, and the stiffness distribution increases sequentially from the loading end to the free end, including variable stiffness loads Transmission of the second medium segment 2 and variable stiffness load transfer of the second medium segment to the first medium segment 3 . The variable stiffness load transfer first medium section 3 is made of resin-impregnated chopped fiber cured; the variable stiffness load transfer second medium section 2 is made of resin-impregnated quartz sand. The stiffness of the first medium section 3 for variable stiffness load transmission is 15GPa to 25GPa; the stiffness of the second medium section for variable stiffness load transmission is 3GPa to 12GPa; the length of the first medium section for variable stiffness load transmission and th...

Embodiment 2

[0044] Such as Figure 3-Figure 5 shown. The variable stiffness load transfer second medium segment 2 is divided into two segments, namely: the first segment 21 of the variable stiffness load transfer second medium segment and the second segment 22 of the variable stiffness load transfer second medium segment. In this embodiment, when the stiffness distribution along the loading end to the free end is 4GPa-10GPa-20GPa, the length ratio of the stiffness distribution is 2:3:5. The resin containing quartz sand is model WSR618 (E-51) Phoenix brand epoxy resin, the size of quartz sand is 100 mesh to 300 mesh, the length of basalt fiber chopped yarn is 6mm to 10mm; the mass ratio of 4GPa is quartz sand / Phoenix brand epoxy Resin=30%, the mass ratio of 10GPa is quartz sand / Phoenix brand epoxy resin=100%, the mass ratio of 20GPa is basalt fiber chopped yarn / vinyl resin=100%. Refer to the figure for the number of segments of the variable stiffness load transfer medium clip Figure 5 ...

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Abstract

The invention discloses an FRP (fiber reinforced polymer) rebar anchoring clamp piece, a manufacturing method thereof and an anchoring method thereof. A circular arc groove for holding FRP rebars is formed in the sector-shaped FRP rebar anchoring clamp piece, the outer surface of the FRP rebar anchoring clamp piece is a circular conical surface, the FRP rebar anchoring clamp piece comprises a first medium segment for variable-stiffness load transfer and a second medium segment for variable-stiffness load transfer along the length direction, the stiffness of the FRP rebar anchoring clamp piecegradually increases from the loading end to the free end, and the first medium segment for variable-stiffness load transfer is formed by curing of resin-infiltrated fiber chopped yarn while the secondmedium segment for variable-stiffness load transfer is formed by curing of resin-infiltrated quartz sand. The FRP rebar anchoring clamp piece has the advantages that the content of fibers and the content of the quartz sand in the variable-stiffness load transfer media as well as lateral stiffness gradually increase from the loading end to the free end, so that the 'notch effect' at the loading ends of the FRP rebars can be relieved or eliminated, and the problem that lateral shear failure of the FRP rebars due to stress concentration is prior to tensile fracture is avoided.

Description

technical field [0001] The invention relates to an anchoring technology of an FRP tendon clip type anchorage using a variable stiffness load transmission medium, and belongs to the technical field of FRP single tendon anchoring. Background technique [0002] Fiber Reinforced Polymer (FRP) is a new type of composite material formed by pultrusion process with fiber as reinforcing material, resin as matrix material, and auxiliary materials such as sizing agent added. FRP has many excellent properties such as light weight, high strength, corrosion resistance, fatigue resistance and good shock absorption performance. It is an ideal material for replacing steel bars in civil engineering structures. have been applied in other structures. [0003] With the development of human beings, the environment in which today's building structures are located is becoming increasingly severe, and the shortcomings of reinforced concrete and prestressed reinforced concrete are gradually revealed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04C5/12
Inventor 汪昕吴智深张磊史健喆朱中国
Owner SOUTHEAST UNIV
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