CN212340872U

CN212340872U - Device for measuring FRP-concrete interface performance by double-sided shearing

Info

Publication number: CN212340872U
Application number: CN202020873404.2U
Authority: CN
Inventors: 朱丽; 郭玉刚; 徐丽红; 丁虹悦; 刘飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2021-01-12
Anticipated expiration: 2030-05-22

Abstract

A device for double-sided shear measurement of FRP-concrete interface performance comprises: the device comprises a test bed, a first concrete block, a second concrete block, fiber cloth, a jack, a steel plate and a force sensor; the two concrete blocks are oppositely arranged on a horizontal test bed from left to right, the first concrete block is of a cuboid structure fixed on the test bed, the left part of the second concrete block close to the first concrete block is of a cuboid structure with the same front and back longitudinal sections, and the right part of the second concrete block is provided with an arc-shaped outer surface; the fiber cloth is pasted around the first concrete block and the second concrete block through building glue; the jack is horizontally arranged between the first concrete block and the second concrete block, and the force sensor is arranged at the force application end. The utility model has simple structure and easy installation; the horizontal loading force mode enables the stress to be more stable; the fiber cloth is symmetrically stuck on two sides, the stress of the fiber cloth is on a straight line, the stress is uniform, and the accuracy of the measurement result is higher.

Description

Device for measuring FRP-concrete interface performance by double-sided shearing

Technical Field

The utility model belongs to concrete capability test field, concretely relates to two-sided device of surveying FRP-concrete interface performance of cuting.

Background

Concrete, concrete for short, is a generic term for engineering composite materials in which aggregates are cemented into a whole by cementitious materials. The concrete is cement concrete prepared with cement as cementing material, sand and stone as aggregate and water (including additive and admixture) in certain proportion and through mixing and stirring. At present, the concrete is a structural form which is most applied at home, and accounts for the vast majority of the total number, and meanwhile, China is also the region which is most applied with the concrete structure in the world. With the increase of the service time, the concrete is inevitably aged and damaged, thereby affecting the mechanical property of the concrete and reducing the safety of the building structure formed by the concrete.

Fiber Reinforced Polymer (FRP) is a composite material formed by winding, molding or pultrusion a reinforcing Fiber material and a matrix material. Because FRP has the characteristics of high specific strength, large specific modulus, strong designability, good corrosion resistance and durability and thermal expansion coefficient similar to that of concrete, the FRP material is widely applied to the reinforcement of concrete structures and can effectively slow down the aging and damage of concrete materials.

In concrete structures reinforced by fiber cloth, the concrete structures are generally not damaged due to the breakage of concrete or the fracture of the fiber cloth, but the interface between the concrete and the fiber cloth is usually stripped, and the stripping is caused because the fiber cloth is adhered to the concrete through building glue, so that the position of a glue layer is easy to damage in the actual use process. Therefore, it is necessary to design a specific test device to measure how much the peeling force of the fiber cloth is. However, the existing measuring device has a complex structure, an unstable center and uneven stress on the fiber cloth, which often results in lower accuracy of the measuring result.

SUMMERY OF THE UTILITY MODEL

The utility model provides a device for double-sided shearing survey FRP-concrete interface performance, which aims at the defects in the prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a device for measuring the performance of an FRP-concrete interface by double-sided shearing is characterized by comprising: the device comprises a test bed, a first concrete block, a second concrete block, fiber cloth, a jack, a steel plate and a force sensor; the first concrete block and the second concrete block are oppositely arranged on a horizontal test bed from left to right, the first concrete block is of a cuboid structure fixed on the test bed, the left part of the second concrete block close to the first concrete block is of a cuboid structure with the same front and back longitudinal sections, and the right part of the second concrete block is provided with an arc-shaped outer surface; the fiber cloth is pasted around the first concrete block and the second concrete block through building glue, the middle section of the fiber cloth is tightly attached to the front side face, the right side face and the rear side face of the second concrete block, and the front section and the rear section of the fiber cloth are tightly attached to the front side face and the rear side face of the first concrete block respectively; the jack is horizontally arranged between the first concrete block and the second concrete block, a base of the jack is fixed on the right side surface of the first concrete block through a steel plate, a force application end of the jack is fixed on the left side surface of the second concrete block through a steel plate, the jack applies force to the second concrete block, and the force application end is provided with a force sensor; the centers of the first concrete block, the second concrete block and the jack are positioned on the same horizontal line, and the fiber cloth is symmetrically arranged in front and back directions by the central connecting line.

In order to optimize the technical scheme, the specific measures adopted further comprise:

further, the test bed is made of a steel plate and is fixed on the ground through foundation bolts.

Furthermore, the surface of the test bed is provided with a bulge, and the center of the bottom of the first concrete block is provided with a fixing hole matched with the bulge and used for fixing the first concrete block on the test bed.

Further, the fiber cloth is made of a carbon fiber reinforced composite material.

Furthermore, two ends of the fiber cloth are respectively positioned in the middle of the front side surface and the rear side surface of the first concrete block.

Further, the jack is welded with the steel plate.

The utility model has the advantages that: the device has simple structure and is easy to install; the horizontal loading force mode enables the stress to be more stable; the fiber cloth is symmetrically stuck on two sides, the stress of the fiber cloth is on a straight line, the stress is uniform, and the accuracy of the measurement result is higher.

Drawings

FIG. 1 is a perspective view of a device for double-sided shear measurement of performance of an FRP-concrete interface.

FIG. 2 is a top view of the apparatus for double-sided shear measurement of performance of FRP-concrete interface.

Fig. 3 is a schematic view of the connection of the first concrete block and the test stand.

The reference numbers are as follows: 1. a test bed; 2. a first concrete block; 3. a second concrete block; 4. fiber cloth; 5. a jack; 6. a steel plate; 7. a force sensor; 8. a protrusion; 9. anchor bolts; 10. and (7) fixing holes.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

The device for measuring the performance of the FRP-concrete interface by double-sided shearing as shown in figures 1 and 2 comprises: the test bed comprises a test bed 1, a first concrete block 2, a second concrete block 3, fiber cloth 4, a jack 5, a steel plate 6 and a force sensor 7. First concrete block 2 and second concrete block 3 are arranged relatively on horizontally test bench 1 about, and first concrete block 2 is the cuboid structure of fixing on test bench 1, and the left side part that second concrete block 3 is close to first concrete block 2 is the cuboid structure that longitudinal section is the same around, and the right side part of second concrete block 3 has circular-arc surface, and the circular arc is tangent with the side around to stress can not produce the sudden change when making fibre cloth 4 paste around two concretes.

As shown in fig. 3, the test stand 1 is made of a steel plate and is fixed to the ground by anchor bolts 9. The surface of the test bed 1 is provided with a bulge 8, and the center of the bottom of the first concrete block 2 is provided with a fixing hole 10 matched with the bulge 8 and used for fixing the first concrete block 2 on the test bed 1.

The fiber cloth 4 can be made of carbon fiber reinforced composite materials, the fiber cloth is pasted around the side faces of the first concrete block 2 and the second concrete block 3 through building glue, the middle section of the fiber cloth 4 is closely attached to the front side, the right side and the rear side of the second concrete block 3, the front section and the rear section of the fiber cloth 4 are closely attached to the front side and the rear side of the first concrete block 2 respectively, and the two end portions are located in the middle positions of the front side and the rear side of the first concrete block 2 respectively. As can be seen from the top view of fig. 2, the fiber cloth 4 is symmetrically and closely attached to the side surfaces of the two pieces of concrete in the front-back direction, and the fiber cloth 4 is stressed on one line in a symmetrical manner at two sides, so that the pure shearing force can be measured.

Jack 5 horizontal installation has steel sheet 6 in 5 both ends of jack all welded between first concrete piece 2 and second concrete piece 3, and the base passes through steel sheet 6 to be fixed on the right flank of first concrete piece 2, and the end of exerting force passes through steel sheet 6 to be fixed on the left surface of second concrete piece 3, and steel sheet 6 can adopt structures such as bolt to fix on the concrete piece. The jack 5 applies force to the second concrete block 3, and a force sensor 7 is arranged at the force application end and used for measuring the stripping force. As is apparent from fig. 2, the centers of the first concrete block 2, the second concrete block 3 and the jack 5 are located on the same horizontal line, and the fiber cloths 4 are symmetrically arranged in front and back directions with the central connecting line as a symmetry axis. In this device, directly through 6 fixed jacks 5 of steel sheet, do not adopt extra bearing structure to combine the symmetrical design of whole device, still improved stability when simplifying the device. Moreover, the jack 5 applies horizontal force, and is more stable compared with the vertical loading in the prior art.

During testing, the device is assembled according to the figure, the first concrete block 2 is a testing end, the second concrete block 2 is a loading end, and the bonding length of the fiber cloth 4 at the testing end is larger than 200 mm. And starting the jack 5, applying force to the loading end, and reading the measurement data of the force sensor 7 when the end part of the fiber cloth 4 is stripped. Due to the arrangement of the double-sided fibre cloth, the peel load capacity measured by the force sensor 7 is finally divided by 2.

It should be noted that, in the present invention, the terms "upper", "lower", "left", "right", "front", "back", etc. are used for the sake of clarity only, and are not used to limit the scope of the present invention, and the relative relationship changes or adjustments may be made without substantial technical changes.

Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, a plurality of modifications and decorations without departing from the principle of the present invention should be considered as the protection scope of the present invention.

Claims

1. A device for measuring the performance of an FRP-concrete interface by double-sided shearing is characterized by comprising: the device comprises a test bed (1), a first concrete block (2), a second concrete block (3), fiber cloth (4), a jack (5), a steel plate (6) and a force sensor (7); the first concrete block (2) and the second concrete block (3) are oppositely arranged on the horizontal test bed (1) from left to right, the first concrete block (2) is of a cuboid structure fixed on the test bed (1), the left part of the second concrete block (3) close to the first concrete block (2) is of a cuboid structure with the same front-back longitudinal section, and the right part of the second concrete block (3) is provided with an arc-shaped outer surface; the fiber cloth (4) is pasted around the first concrete block (2) and the second concrete block (3) through building glue, the middle section of the fiber cloth (4) is tightly attached to the front side, the right side and the rear side of the second concrete block (3), and the front section and the rear section of the fiber cloth (4) are tightly attached to the front side and the rear side of the first concrete block (2) respectively; the lifting jack (5) is horizontally arranged between the first concrete block (2) and the second concrete block (3), a base of the lifting jack (5) is fixed on the right side face of the first concrete block (2) through a steel plate (6), a force application end of the lifting jack (5) is fixed on the left side face of the second concrete block (3) through the steel plate (6), the lifting jack (5) applies force to the second concrete block (3), and the force application end is provided with a force sensor (7); the centers of the first concrete block (2), the second concrete block (3) and the jack (5) are positioned on the same horizontal line, and the fiber cloth (4) is symmetrically arranged front and back by the central connecting line.

2. The apparatus for double-sided shear measurement of FRP-concrete interface properties of claim 1 wherein: the test bed (1) is made of steel plates, and the test bed (1) is fixed on the ground through foundation bolts (9).

3. The apparatus for double-sided shear measurement of FRP-concrete interface properties of claim 2 wherein: the surface of the test bed (1) is provided with a protrusion (8), and the center of the bottom of the first concrete block (2) is provided with a fixing hole (10) matched with the protrusion (8) for fixing the first concrete block (2) on the test bed (1).

4. The apparatus for double-sided shear measurement of FRP-concrete interface properties of claim 1 wherein: the fiber cloth (4) is made of carbon fiber reinforced composite materials.

5. The apparatus for double-sided shear measurement of FRP-concrete interface properties of claim 1 wherein: and two ends of the fiber cloth (4) are respectively positioned in the middle of the front side surface and the rear side surface of the first concrete block (2).

6. The apparatus for double-sided shear measurement of FRP-concrete interface properties of claim 1 wherein: the jack (5) is welded with the steel plate (6).