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A kind of concrete and frp bonding interface shear strength and stiffness testing device and method

A technology of shear strength and testing device, which is applied in the direction of measuring device, using a stable shear force to test the strength and strength characteristics of materials, etc. The shear stiffness cannot be accurately obtained, and there is no test of the shear performance of the concrete and FRP interface, so as to avoid damage.

Active Publication Date: 2021-12-31
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of concrete and frp bonding interface shear strength and stiffness testing device and method
  • A kind of concrete and frp bonding interface shear strength and stiffness testing device and method
  • A kind of concrete and frp bonding interface shear strength and stiffness testing device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0050] This embodiment provides a device for testing the shear strength and stiffness of the concrete and FRP bonding interface, including an outer sleeve 1, a connecting rod 4 and a tightening sealing ring 2; The outer diameter of the barrel 5 is the same; the connecting rod 4 includes a round rod part 4-1 for tightly socketing with the FRP sleeve 5 and a threaded part 4-3 for connecting with the threaded hole of the torsion joint 6; the round rod part 4 The end of the -1 is located outside the FRP sleeve 5; the tightening seal ring 2 includes two half tightening rings 2-1 and bolts 2-3 connecting the two half tightening rings 2-1; the half tightening ring 2 -1 includes a first half-ring body, a second half-ring body, and bolt connection ears arranged on the first half-ring body and the second half-ring body; the inner diameter of the first half-ring body is consistent with the outer diameter of the outer sleeve 1 , is provided with a binder injection hole 2-2; the inner diam...

Embodiment 2

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

[0060] S1, pour concrete 3 into the outer sleeve 1, vibrate and compact, maintain, remove the laitance after completion, and put it into an incubator for heat preservation after curing and molding;

[0061] S2, quickly wrap the heated FRP sleeve 5 on the round rod portion 4-1 of the cooled connecting rod 4, using 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 sets tightly on the round rod part 4-1;

[0062] S3, apply lubricant (such as Vaseline) to the bottom surface of the overhanging part of the round rod part 4-1, and the end of the round rod part 4-1...

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; after the concrete 3 is cured and formed, it is placed in a temperature of 20°C±2°C and a relative humidity of 65±5%. Cured in the environment for 28 days to form concrete-filled steel tubular columns;

[0079] In the step S2, the round rod portion 4-1 is 1-3 mm longer than the FRP sleeve 5, and the diameter is slightly larger than the inner diameter of the FRP sleeve 5, so as to realize an interference fit; the diameter of the adhesive injection hole 2-2 is about 2mm; the connecting rod 4 is put into the freeze-thaw test box to cool down by 50°C, and the FRP sleeve 5 is put into the temperature test box to heat up by 30°C. After 8 hours, take it out, and use the principle of thermal expansion and cold contraction to set the FRP sleeve 5 into the round rod part 4-1 to achie...

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Abstract

The invention provides a concrete and FRP bonded interface shear strength and stiffness testing device and method, which belong to the technical field of bonded shear strength test, including an outer sleeve, a connecting rod and a fastening seal ring; the inner diameter of the outer sleeve It is consistent with the outer diameter of the FRP sleeve; the connecting rod includes a round rod part and a threaded part; the end of the round rod part is located outside the FRP sleeve; the fastening seal ring includes two half fastening rings and the connection between the two half fastening rings The bolts of the ring; the semi-fastening ring includes the first semi-annular body, the second semi-annular body and the bolt connection ears arranged on the first semi-annular body and the second semi-annular body; the inner diameter of the first semi-annular body and the jacket The outer diameter of the barrel is consistent, and an adhesive injection hole is provided; the inner diameter of the second half ring body is consistent with the outer diameter of the FRP sleeve. The invention measures the shear strength of the bonded interface between concrete and FRP in a state of pure shear stress, which overcomes the defect that the tensile stress of conventional shear test results affects the shear strength of the interface.

Description

technical field [0001] The invention belongs to the technical field of bonding shear strength test, and specifically discloses a concrete and FRP bonding interface shear strength and stiffness testing device and method. 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 the matrix material through winding, molding or pultrusion and other molding processes. It has the characteristics of corrosion resistance, fatigue resistance and convenient construction, and is widely used in the field of civil engineering. In order to give full play to the advantages of FRP tensile mechanics, the FRP fiber cloth or board is pasted on the surface of the reinforced concrete structure through the matching adhesive. The redistribution of the stress and strain of the reinforced object is realized, and the flexural resistance, shear resistance an...

Claims

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Application Information

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