Device and method for testing shear strength and rigidity of concrete and FRP bonding interface

A technology of shear strength and testing device, which is applied in the direction of measuring device, using stable shear force to test material strength, strength characteristics, etc., can solve the problem of difficult measurement of slippage of FRP-concrete bond interface, no concrete and FRP The test of the interface shear performance and the inability to accurately obtain the shear stiffness of the bonded interface have achieved the effect of avoiding damage

Active Publication Date: 2020-05-08
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, what the above experiments obtained is naturally not the shear strength of the FRP-concrete bond interface, and there is no real test of the shear performance of the interface between concrete and FRP.
In addition, during the stiffness test, since the slippage of the FRP-concrete bond interface is difficult to measure during the experiment, the shear stiffness of the bond interface cannot be accurately obtained.

Method used

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  • Device and method for testing shear strength and rigidity of concrete and FRP bonding interface
  • Device and method for testing shear strength and rigidity of concrete and FRP bonding interface
  • Device and method for testing shear strength and rigidity of concrete and FRP bonding interface

Examples

Experimental program
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Effect test

Embodiment 1

[0050] This embodiment provides a concrete and FRP bonding interface shear strength and stiffness testing device, including an outer sleeve 1, a connecting rod 4 and a fastening seal ring 2; The outer diameter of the cylinder 5 is consistent; the connecting rod 4 includes a round rod part 4-1 for tightly fitting with the FRP sleeve 5 and a threaded part 4-3 for connecting with the threaded hole of the twist joint 6; the round rod part 4 The end of -1 is located outside the FRP sleeve 5; the fastening seal ring 2 includes two half fastening rings 2-1 and bolts 2-3 connecting the two half fastening rings 2-1; the half fastening ring 2 -1 includes the first semi-annular body, the second semi-annular body and the bolt connection ears provided on the first semi-annular body and the second semi-annular body; the inner diameter of the first semi-annular body is consistent with the outer diameter of the outer sleeve 1 , is provided with the adhesive injection hole 2-2; the inner diame...

Embodiment 2

[0059] The present embodiment provides a method for testing the shear strength and stiffness of the concrete and FRP bonding interface, which is carried out by using the concrete and FRP bonding interface shear strength and stiffness testing device described in Example 1, comprising the following steps:

[0060] S1, pouring concrete 3 into the outer sleeve 1, vibrating and compacting, curing, removing the laitance after completion, and putting it into a constant temperature box for heat preservation after curing;

[0061] S2, quickly set the heated FRP sleeve 5 on the round rod portion 4-1 of the cooled connecting rod 4, and use the principle of thermal expansion and contraction, when the connecting rod 4 and the FRP sleeve 5 return to normal temperature, the FRP sleeve 5 set tightly on the round rod part 4-1;

[0062] S3, apply a lubricant (such as Vaseline) on the bottom surface of the extended part of the round rod part 4-1, and the end of the round rod part 4-1 is docked w...

Embodiment 3

[0077] The difference between this embodiment and embodiment 2 is:

[0078] In the step S1, the inner diameter of the outer sleeve 1 is 100mm-200mm, the height is 100mm-200mm, and the thickness is 20-40mm; the concrete 3 is cured and placed in a room with a temperature of 20°C±2°C and a relative humidity of 65±5%. Cured in the environment for 28 days to form a steel tube concrete column;

[0079] In the step S2, the round rod part 4-1 is 1-3 mm longer than the FRP sleeve 5, and its diameter is slightly larger than the inner diameter of the FRP sleeve 5, so as to achieve interference fit; the diameter of the adhesive injection hole 2-2 is It is about 2mm; put the connecting rod 4 into the freeze-thaw test box to cool down by 50°C, and put the FRP sleeve 5 into the temperature test box to raise the temperature by 30°C. Take it out after standing for 8 hours, and use the principle of thermal expansion and contraction to insert the FRP sleeve 5 into the round rod part 4-1 to achi...

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Abstract

The invention provides a device and a method for testing shear strength and rigidity of a concrete and FRP bonding interface. The device and the method belong to the technical field of bonding shear strength tests. The device comprises an outer sleeve, a connecting rod and a fastening sealing ring, wherein the inner diameter of the outer sleeve is consistent with the outer diameter of the FRP sleeve; the connecting rod comprises a round rod part and a threaded part; the end part of the round rod part is positioned outside the FRP sleeve; the fastening sealing ring comprises two semi-fasteningrings and a bolt for connecting the two semi-fastening rings; each semi-fastening ring comprises a first semi-ring body, a second semi-ring body and bolt connecting lugs arranged on the first semi-ring body and the second semi-ring body; the inner diameter of the first semi-ring body is consistent with the outer diameter of the outer sleeve, and an adhesive injection hole is formed in the first semi-ring body; and the inner diameter of the second semi-ring body is consistent with the outer diameter of the FRP sleeve. According to the device and the method, the shear strength of the concrete and FRP bonding interface in a pure shear stress state is measured, and the defect that the shear strength of the interface is influenced by tensile stress of a conventional shear test result is overcome.

Description

technical field [0001] The invention belongs to the technical field of bonding shear strength test, and specifically discloses a device and method for testing the shear strength and stiffness of the bonding interface between concrete and FRP. Background technique [0002] Fiber-reinforced composite material (FRP for short) is a composite material formed by fiber-reinforced materials, such as glass fiber, carbon fiber, aramid fiber, etc., and matrix materials through winding, molding or pultrusion. Corrosion resistance, fatigue resistance and convenient construction are widely used in the field of civil engineering. In order to give full play to the advantages of FRP tensile strength, the FRP fiber cloth or plate is pasted on the surface of the reinforced concrete structure through a matching adhesive. After curing, it works together with the reinforced structure, and the deformation is coordinated, sharing the load borne by the concrete structure. Realize the stress and str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24G01N3/26G01N3/08
CPCG01N3/24G01N3/26G01N3/08
Inventor 张强
Owner SHANXI UNIV
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