SMA-GFRP (Styrene Maleic Anhydride-Glass Fiber Reinforced Plastics) hyperelastic composite bar and manufacturing method thereof

A composite reinforcement and superelasticity technology, applied in the direction of structural elements, building components, building reinforcements, etc., to reduce the accumulation of residual displacement, improve the seismic performance, and improve the overall performance.

Inactive Publication Date: 2017-03-08
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the SMA-GFRP superelasticity made by mixing Ni-Ti SMA filaments, GFRP tows and resin matrix (superelasticity: refers to the strain that is much greater than the elastic limit strain of the sample under the action of extern

Method used

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  • SMA-GFRP (Styrene Maleic Anhydride-Glass Fiber Reinforced Plastics) hyperelastic composite bar and manufacturing method thereof
  • SMA-GFRP (Styrene Maleic Anhydride-Glass Fiber Reinforced Plastics) hyperelastic composite bar and manufacturing method thereof
  • SMA-GFRP (Styrene Maleic Anhydride-Glass Fiber Reinforced Plastics) hyperelastic composite bar and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: as figure 1 As shown, the SMA-GFRP superelastic composite tendon includes SMA filament 1, GFRP filament bundle 2 and a flexible vinyl ester resin matrix 3 solidified between the SMA filament 1 and the GFRP filament bundle 2 through a pultrusion process; The SMA wire 1 and the GFRP wire bundle 2 are placed in parallel.

[0026] A kind of preparation method of SMA-GFRP superelastic composite bar, concrete steps are:

[0027] a. Place 24% by volume ultra-fine SMA wire 1 with a diameter of 0.5 mm and 44% GFRP tow 2 in parallel, and use a flexible vinyl ester resin matrix 3 to solidify between the two fibers through a pultrusion process, The volume percentage of the flexible vinyl ester resin matrix 3 is 32%, and it is formed by a pultrusion process, and the cross-section adopts the same circular shape as the steel bar;

[0028] b. In order to enhance the anchorage between the SMA-GFRP bar and the concrete, the surface of the SMA-GFRP bar is made of special s...

Embodiment 2

[0029] Embodiment 2: as figure 2 As shown, the SMA-GFRP superelastic composite tendon includes SMA filament 1, GFRP filament bundle 2 and a flexible vinyl ester resin matrix 3 solidified between the SMA filament 1 and the GFRP filament bundle 2 through a pultrusion process; The SMA wire 1 and the GFRP wire bundle 2 are placed in a ring.

[0030] A kind of preparation method of SMA-GFRP superelastic composite bar, concrete steps are:

[0031] a. Place 24% by volume ultra-fine SMA wire 1 with a diameter of 0.5 mm and 44% GFRP tow 2 in a ring, and use a flexible vinyl ester resin matrix 3 to solidify between the two fibers through a pultrusion process , the volume percentage of the flexible vinyl ester resin matrix 3 is 32%, formed by a pultrusion process, and the cross-sectional form adopts the same circular shape as the steel bar;

[0032] b. In order to enhance the anchorage between the SMA-GFRP bar and the concrete, the surface of the SMA-GFRP bar is made of special shape ...

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PUM

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Abstract

The invention relates to an SMA-GFRP (Styrene Maleic Anhydride-Glassfiber Reinforced Plastics) hyperelastic composite bar and a manufacturing method thereof. The manufacturing method of the SMA-GFRP hyperelastic composite bar comprises the following specific steps: a, placing extremely-fine SMA filaments which are 24 percent in volume percentage and are 0.5mm in diameters and 44 percent of GFRP tows in parallel or annularly, and curing a flexible vinyl ester resin matrix between two kinds of fibers through a pultrusion process, wherein the volume percentage of the flexible vinyl ester resin matrix is 32 percent, and a section is a circle being the same as a steel bar through molding of the pultrusion process; b, deforming the surface of the SMA-GFRP bar or performing sand burning treatment on the surface to enhance anchoring between the SMA-GFRP and concrete. The SMA-GFRP hyperelastic composite bar has high ductility and corrosion resistance, and the problem of limited use of the GFRP bar in an anti-earthquake structure is solved; when the SMA-GFRP composite bar is applied to a plastic hinging area, the anti-earthquake performance of a structure is enhanced, residual displacement accumulation after continuous earthquakes is reduced, and the integral performance of the structure after continuous earthquakes is improved.

Description

technical field [0001] The invention belongs to the field of building and civil engineering materials, and in particular relates to a SMA-GFRP superelastic composite bar and a preparation method thereof. Background technique [0002] Traditional reinforced concrete structures mainly use steel bars as reinforcing bars, but many years of practical experience have found that steel bars have the following disadvantages: First, the corrosion of steel bars is very serious, especially in structures in coastal areas such as oceans and ports. The bearing capacity of the structure is greatly reduced, and the expected service life cannot be achieved, and the huge maintenance and renovation costs cause a waste of resources; second, the excessive deformation of the steel bar after yielding will lead to permanent residual displacement of the structure, making the overall bearing capacity of the structure reduce. Especially when an earthquake occurs, the permanent plastic deformation of s...

Claims

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Application Information

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IPC IPC(8): E04C5/07
CPCE04C5/073
Inventor 徐新生潘美霞徐晓达闫玉本
Owner UNIV OF JINAN
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