CN212059858U

CN212059858U - Simple device for measuring FRP (fiber reinforced plastic) bonding performance

Info

Publication number: CN212059858U
Application number: CN202020873394.2U
Authority: CN
Inventors: 许兰兰; 袁业清; 杨宇锋; 陈宣捷; 马晓彬; 马永骏
Original assignee: Jiangsu Open University of Jiangsu City Vocational College
Current assignee: Jiangsu Open University of Jiangsu City Vocational College
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2020-12-01
Anticipated expiration: 2030-05-22

Abstract

A simple device for measuring FRP bonding performance comprises: the concrete test block, the fiber cloth, the U-shaped top plate, the bottom plate, the bolt, the concrete base and the steel bar; the concrete test block is in a cuboid structure, is arranged on the bottom plate, is provided with a U-shaped top plate, and is fixedly connected with the bottom plate through four vertical bolts so as to clamp the concrete test block in the middle; the upper end of the fiber cloth is fixed on an upper clamp of the testing machine, the lower part of the fiber cloth is vertically stuck on the side surface of the concrete test block, and the U-shaped opening faces to the side surface; the bottom of the bottom plate is fixed with a steel bar, the steel bar vertically penetrates through the concrete base and is fixed in the concrete base, and the lower end of the steel bar penetrates out of the concrete base and is fixed in a lower clamp of the testing machine. The utility model discloses simple structure, easy installation combines the material testing machine to use, can the effective control loading rate, the destruction condition at interface under the different rates of research to stable in structure is difficult for rocking in the loading process. In addition, part of the structure can be repeatedly utilized, and the environment is saved.

Description

Simple device for measuring FRP (fiber reinforced plastic) bonding performance

Technical Field

The utility model belongs to concrete capability test field, concretely relates to simple and easy survey FRP bonding performance's device.

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 study the relationship between the force loading and the fiber cloth peeling. However, the existing measuring device has a complex and unstable structure, is easy to shake in the loading process, and some measuring devices can only simply measure the force, but cannot obtain the relationship between the loading rate and the interface damage degree, and have low measuring result accuracy and research.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to not enough among the prior art, provide a simple and easy survey FRP bonding property's device.

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

a simple device for measuring FRP bonding performance is characterized by comprising: the concrete test block, the fiber cloth, the U-shaped top plate, the bottom plate, the bolt, the concrete base and the steel bar; the concrete test block is of a cuboid structure, the concrete test block is installed on the bottom plate, the U-shaped top plate is installed on the concrete test block, the U-shaped top plate and the bottom plate are fixedly connected through four vertical bolts, and the concrete test block is clamped between the U-shaped top plate and the bottom plate; the upper end of the fiber cloth is fixed in an upper clamp of the testing machine, the lower part of the fiber cloth is vertically adhered to the side surface of the concrete test block, and the U-shaped opening of the U-shaped top plate faces to the side surface where the fiber cloth is located; the bottom plate bottom is fixed with the reinforcing bar, the reinforcing bar passes the concrete foundation perpendicularly and fixes in the concrete foundation, and the lower extreme of reinforcing bar is worn out the concrete foundation and is fixed in the lower anchor clamps of testing machine.

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

furthermore, the fiber cloth is made of carbon fiber reinforced composite materials and is adhered to the side face of the concrete test block through building glue.

Further, the bottom plate and the reinforcing steel bars are integrally formed.

Furthermore, U type roof and bottom plate are the steel construction, and the steel reinforcement welding is in the bottom plate bottom.

Furthermore, a vertical through hole matched with the steel bar is formed in the concrete base, threads are formed in the surface of the steel bar, and the steel bar vertically penetrates through the concrete base and is fixed at the lower end through a nut.

Furthermore, a steel plate is arranged between the concrete base and the nut, and the steel bar vertically penetrates through the concrete base and the steel plate and is fixed at the lower end part through the nut.

The utility model has the advantages that: the utility model discloses simple structure, easy installation combines the material testing machine to use, can the effective control loading rate, the destruction condition at interface under the different rates of research to stable in structure is difficult for rocking in the loading process. In addition, part of the structure can be repeatedly utilized, and the environment is saved.

Drawings

FIG. 1 is a front view of a simple apparatus for measuring FRP bonding performance.

FIG. 2 is a perspective view of a simple apparatus for measuring the bonding property of FRP.

FIG. 3 is a side view of a simple apparatus for measuring the bonding property of FRP.

FIG. 4 is a plan view of a simple apparatus for measuring the FRP bonding performance.

The reference numbers are as follows: 1. testing concrete blocks; 2. fiber cloth; 3. a U-shaped top plate; 4. a base plate; 5. a bolt; 6. a concrete base; 7. reinforcing steel bars; 8. an upper clamp; 9. a lower clamp; 10. a nut; 11. and (3) a steel plate.

Detailed Description

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

The simple apparatus for measuring the bonding property of FRP as shown in FIGS. 1 to 4 comprises: concrete test block 1, fibre cloth 2, U type roof 3, bottom plate 4, bolt 5, concrete foundation 6, reinforcing bar 7.

Concrete test block 1 is the cuboid structure, concrete test block 1 is installed on bottom plate 4, install U type roof 3 on the concrete test block 1, U type roof 3 and bottom plate 4 are the steel construction, as shown in fig. 4, both connect fixedly through four perpendicular bolts 5 that distribute in the four corners, press from both sides concrete test block 1 between U type roof 3 and bottom plate 4, at the loaded in-process of testing machine like this, U type roof 3, the frame that bottom plate 4 and four bolts 5 constitute, can firmly fix concrete test block 1 in the centre.

The fiber cloth 2 is made of carbon fiber reinforced composite materials, the upper end of the fiber cloth is fixed in an upper clamp 8 of the testing machine, and the lower portion of the fiber cloth is vertically adhered to the side face of the concrete test block 1 through building glue. The U-shaped opening of the U-shaped top plate 3 faces the side face where the fiber cloth 2 is located, so that the U-shaped top plate 3 does not influence the stretching of the fiber cloth 2 while pressing the concrete test block 1.

As shown in fig. 2, the bottom of the bottom plate 4 is fixed with a steel bar 7, and the two can be integrally formed or connected by welding. In the loading process of the testing machine, the fiber cloth 2 is applied with force upwards, and simultaneously the reinforcing steel bars 7 are applied with force downwards, so that the fiber cloth 2 and the concrete test block 1 are peeled off. Because of the strength of the steel bar 7, it can be used to directly receive force, and in order to increase the connection firmness of the bottom plate 4 and the steel bar 7, the bottom plate 4 is also made of steel. However, in the process of force application, the steel structure is easy to deform, so that the structure is unstable, and the concrete test block 1 shakes, so that the concrete base 6 with a cuboid structure is arranged below the bottom plate 4. A vertical through hole matched with the steel bar 7 is formed in the concrete base 6, threads are arranged on the surface of the steel bar 7, the steel bar 7 vertically penetrates through the concrete base 6 and the steel plate 11 and is fixed to the lower end through a nut 10, and the lower end of the steel bar 7 penetrates out of the concrete base 6 and is fixed in a lower clamp 9 of the testing machine. Through the structure, the force can be uniformly dispersed, and the deformation of the bottom plate 4 is reduced. In addition, because the bottom plate 4 is not fixedly connected with the concrete test block 1, the structure formed by the bottom plate 4, the reinforcing steel bars 7, the concrete base 6, the steel plate 11 and the screw caps 10 can be recycled and is suitable for various interface performance measuring devices.

During the test, the device is assembled according to the figure, the U-shaped top plate 3, the bottom plate 4, the concrete test block 1 and the bolt 5 are assembled firstly, then the reinforcing steel bar 7 fixed at the bottom of the bottom plate 4 penetrates through the concrete base 6 and the steel plate 11, and is fixed through the nut 10 and then is fixed on the testing machine. The fiber cloth 2 is then stuck and fixed to the testing machine. And starting the material testing machine, vertically drawing the upper clamp 8 and the lower clamp 9 in opposite directions, controlling the loading rate, and researching the damage condition of the interface between the fiber cloth and the concrete at different rates.

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 simple device for measuring FRP bonding performance is characterized by comprising: the concrete test block comprises a concrete test block (1), fiber cloth (2), a U-shaped top plate (3), a bottom plate (4), bolts (5), a concrete base (6) and reinforcing steel bars (7); the concrete test block (1) is of a cuboid structure, the concrete test block (1) is installed on the bottom plate (4), the concrete test block (1) is provided with a U-shaped top plate (3), the U-shaped top plate (3) and the bottom plate (4) are fixedly connected through four vertical bolts (5), and the concrete test block (1) is clamped between the U-shaped top plate (3) and the bottom plate (4); the upper end of the fiber cloth (2) is fixed in an upper clamp (8) of the testing machine, the lower part of the fiber cloth (2) is vertically adhered to the side surface of the concrete test block (1), and the U-shaped opening of the U-shaped top plate (3) faces the side surface where the fiber cloth (2) is located; the bottom plate (4) bottom is fixed with reinforcing bar (7), reinforcing bar (7) pass concrete foundation (6) perpendicularly and fix in concrete foundation (6), and concrete foundation (6) are worn out and the lower extreme of reinforcing bar (7) is fixed in lower anchor clamps (9) of testing machine.

2. A simple apparatus for measuring the bonding property of FRP as claimed in claim 1, wherein: the fiber cloth (2) is made of carbon fiber reinforced composite materials and is adhered to the side face of the concrete test block (1) through building glue.

3. A simple apparatus for measuring the bonding property of FRP as claimed in claim 1, wherein: the bottom plate (4) and the steel bars (7) are integrally formed.

4. A simple apparatus for measuring the bonding property of FRP as claimed in claim 1, wherein: u type roof (3) and bottom plate (4) are the steel construction, and reinforcing bar (7) welding is in bottom plate (4) bottom.

5. A simple apparatus for measuring the bonding property of FRP as claimed in claim 1, wherein: the concrete base (6) is provided with a vertical through hole matched with the steel bar (7), the surface of the steel bar (7) is provided with threads, and the steel bar (7) vertically penetrates through the concrete base (6) and is fixed at the lower end part through a screw cap (10).

6. A simple apparatus for measuring the adhesion of FRP's as defined in claim 5 wherein: still be equipped with steel sheet (11) between concrete foundation (6) and nut (10), reinforcing bar (7) are passed concrete foundation (6) and steel sheet (11) perpendicularly and are fixed through nut (10) in lower extreme portion.