CN111257221A - Device and method for testing bonding performance of fiber reinforced composite material reinforced concrete - Google Patents
Device and method for testing bonding performance of fiber reinforced composite material reinforced concrete Download PDFInfo
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- CN111257221A CN111257221A CN202010160460.6A CN202010160460A CN111257221A CN 111257221 A CN111257221 A CN 111257221A CN 202010160460 A CN202010160460 A CN 202010160460A CN 111257221 A CN111257221 A CN 111257221A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/303—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated only by free-falling weight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0033—Weight
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Abstract
The invention relates to the technical field of mechanical property test devices, in particular to a device and a method for testing the bonding property of fiber reinforced composite reinforced concrete. A fiber reinforced composite reinforced concrete bonding performance testing device comprises a mounting bracket, wherein a movable platform and a fixed platform are sequentially mounted on the mounting bracket from bottom to top, the movable platform extends outwards to form an impact part, and a first object placing space for placing a first test block and a second object placing space for placing a second test block are respectively formed on the movable platform and the fixed platform; the balance box is connected with the movable platform through the connecting piece, and the balance weight is configured in the balance box, and the connecting piece bypasses the top of the mounting bracket, so that the balance box and the movable platform are positioned on two sides of the mounting bracket. The accurate energy consumed by the fragment cracking of the fiber reinforced composite material can be obtained by measuring the energy of the impact piece impacting the movable platform and the energy difference of the movable platform, the first test block and the impact piece after the connection interface is fractured.
Description
Technical Field
The invention relates to the technical field of mechanical property test devices, in particular to a device and a method for testing the bonding property of fiber reinforced composite reinforced concrete.
Background
Nowadays, Fiber Reinforced Polymer (FRP) has been widely used in the field of seismic reinforcement of concrete structures due to its advantages of light weight, high strength and convenience in construction. When the FRP reinforced concrete structure is stressed together, the fracture surface of the structure is usually the contact interface of the FRP and the concrete, so that the research on the FRP-concrete interface strength is very important. In practical application, the FRP reinforced concrete often bears dynamic load effects such as earthquake, explosion, impact and the like, and the FRP reinforced concrete can be damaged to different degrees under the dynamic impact effect, wherein debonding is one of the main damage modes of the FRP reinforced concrete structure.
Chinese patent document CN107036915A discloses a test device for measuring bonding performance between FRP sheets and concrete under impact load, which makes the lower FRP sheet under tension by three-point bending loading, and measures strain and stress generated at each position of FRP by two concrete test blocks connected by FRP sheets in the process of being hit by heavy hammers with different loads.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the impact load performance testing device in the prior art cannot test the actual stress between the FRP and the concrete interface, thereby providing the FRP reinforced concrete bonding performance testing device and the method.
In order to solve the above technical problems, the present invention provides a device for testing the bonding property of fiber reinforced composite reinforced concrete, comprising:
the test device comprises a mounting bracket, a movable platform and a fixed platform are sequentially mounted on the mounting bracket from bottom to top, the movable platform extends outwards to form an impact part, a first object placing space for placing a first test block and a second object placing space for placing a second test block are respectively formed on the movable platform and the fixed platform, and the first test block and the second test block are connected through a fiber reinforced composite material sheet during testing;
the balance box is connected with the movable platform through the connecting piece, and the balance weight is configured in the balance box, and the connecting piece bypasses the top of the mounting bracket, so that the balance box and the movable platform are located on two sides of the mounting bracket, and before external impact force is applied in a test, the balance box and the balance weight are kept in a balanced state with the movable platform and the first test block.
Preferably, the movable platform is provided with a limiting frame, and the limiting frame and the movable platform enclose a first object placing space; the mounting bracket is further provided with a baffle which is positioned above the fixed platform, and a second object placing space is formed between the baffle and the fixed platform.
Preferably, the limiting frame is provided with a first jacking screw in a penetrating mode, and the baffle plate is provided with a second jacking screw in a penetrating mode.
Preferably, a plurality of rollers are sequentially arranged on the mounting bracket along the vertical direction, and one end of the movable platform is abutted against the rollers.
Preferably, the mounting bracket is provided with an auxiliary plate, the auxiliary plate is provided with a force application rail, and the outlet end of the force application rail extends to the impact part.
Preferably, the outlet end of the force application rail is arranged perpendicular to the impact portion.
Preferably, the top of the mounting bracket is provided with a fixed pulley, and the connecting piece is connected with the movable platform through the fixed pulley.
The invention also provides a method for testing the bonding performance of the fiber reinforced composite material reinforced concrete, which comprises the following steps:
connecting the first test block and the second test block through a fiber reinforced composite material sheet, loading the first test block in the first object placing space, loading the second test block in the second object placing space, and loading balance weights into the balance box so as to keep the movable platform, the first test block, the balance box and the balance weights in a balanced state;
the impact part of the impact piece impacts the impact part of the movable platform to enable the movable platform to fall, and a first speed before the impact part impacts the impact part and a second speed when the impact part and the movable platform start falling together are tested and recorded, so that energy consumption of the composite material sheet increased by the fibers is obtained.
Preferably, the method further comprises the step of clamping the first test block on the fixed platform by adjusting the first clamping screw and clamping the second test block on the movable platform by adjusting the second clamping screw.
Preferably, the method further comprises repeating the step of striking the movable platform with the shock member by varying the mass or drop height of the shock member.
The technical scheme of the invention has the following advantages:
1. the invention provides a fiber reinforced composite material reinforced concrete bonding performance testing device, which comprises a mounting bracket, wherein a movable platform and a fixed platform are sequentially mounted on the mounting bracket from bottom to top, an impact part extends outwards from the movable platform, a first object placing space for placing a first test block and a second object placing space for placing a second test block are respectively formed on the movable platform and the fixed platform, and the first test block and the second test block are connected through a fiber reinforced composite material sheet during testing; the balance box is connected with the movable platform through the connecting piece, and the balance weight is configured in the balance box, and the connecting piece bypasses the top of the mounting bracket, so that the balance box and the movable platform are located on two sides of the mounting bracket, and before external impact force is applied in a test, the balance box and the balance weight are kept in a balanced state with the movable platform and the first test block. Before the test, the balance weight is arranged in the balance box, so that the fiber reinforced composite material sheet is not stressed before the movable platform is subjected to impact force; when the fiber reinforced composite material fragment cracking test method is used for testing, the impact piece is utilized to impact the movable platform, the movable platform drives the first test block to move downwards, so that the interface between the fiber reinforced composite material sheet and the first test block or the second test block is cracked, and the energy consumed by fragment cracking of the fiber reinforced composite material can be obtained by measuring the energy of the impact piece impacting the movable platform and the energy difference of the movable platform, the first test block and the impact piece after the connecting interface is cracked so as to represent the bonding property of the fiber reinforced composite material.
2. According to the device for testing the bonding property of the fiber reinforced composite material reinforced concrete, the movable platform is provided with the limiting frame, and the limiting frame and the movable platform enclose a first object placing space; the mounting bracket is further provided with a baffle which is positioned above the fixed platform, and a second object placing space is formed between the baffle and the fixed platform. Utilize movable platform and spacing frame to carry on spacingly to first test block, utilize fixed platform and baffle to carry on spacingly to the second test block, when preventing that fibre reinforced composite from breaking, displacement takes place for first test block or second test block, guarantees the accuracy of experimental data.
3. According to the device for testing the bonding performance of the fiber reinforced composite material reinforced concrete, provided by the invention, the auxiliary plate is arranged on the mounting bracket, the force application rail is arranged on the auxiliary plate, the outlet end of the force application rail extends to the impact part, the impact piece slides down from the force application rail to provide impact force, the impact force of the impact piece on the movable platform can be quantitatively controlled by controlling the mass of the impact piece and the initial position of the impact piece on the force application rail, the impact position of the impact piece on the movable platform can be controlled by controlling the position of the outlet of the force application rail, and the impact positions of the impact piece on the movable platform in multiple tests are completely the same.
4. According to the device for testing the bonding performance of the fiber reinforced composite material reinforced concrete, the installation support is provided with the plurality of rollers along the vertical direction, so that sliding friction between the movable platform and the installation support is converted into rolling friction when the movable platform falls down, and the influence on the test is reduced to the greatest extent.
5. According to the device for testing the bonding performance of the fiber reinforced composite material reinforced concrete, the fixed pulley is arranged at the top of the mounting support, the connecting piece is connected with the movable platform through the fixed pulley, so that the resistance between the connecting piece and the mounting support is reduced, the movable platform is ensured to fall smoothly after the fiber reinforced composite material sheet is broken by impact, and the influence of the resistance between the connecting piece and the mounting support on test data is reduced.
6. According to the method for testing the bonding performance of the fiber reinforced composite material reinforced concrete, the impact piece impacts the movable plate, so that the interface between the fiber reinforced composite material sheet and the first test block or the interface between the fiber reinforced composite material sheet and the second test block is broken, a first speed before the impact piece impacts the impact part and a second speed when the impact piece and the movable platform fall together are tested and recorded, and therefore the energy consumption of the fiber reinforced composite material sheet is obtained. Not only furthest has avoided the influence of other factors to the test result, and whole device's stability is higher moreover, simple structure, and the cost is lower.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a device for testing the bonding performance of a fiber reinforced composite material reinforced concrete provided in an embodiment of the present invention
Fig. 2 is a schematic view of fig. 1 from another perspective.
Description of reference numerals: 1. mounting a bracket; 2. a movable platform; 3. a fixed platform; 4. a limiting frame; 5. a balancing box; 6. a connecting member; 7. a baffle plate; 8. a drum; 9. an auxiliary plate; 10. a force application track; 11. a fixed pulley; 12. a first test block; 13. a second test block; 14. a fiber reinforced composite sheet; 15. an impact member.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
Fig. 1 and 2 show a concrete bonding performance testing device of a fiber reinforced composite reinforced concrete provided by the invention, which comprises a mounting bracket 1 and two auxiliary plates 9 which are sequentially and parallelly mounted on a connecting plate, wherein the top ends of the two auxiliary plates 9 are provided with a force application rail 10 for limiting the movement path of an impact piece 15.
Installing movable platform 2, fixed platform 3 and baffle 7 from bottom to top in proper order on installing support 1, movable platform 2, fixed platform 3 and the setting of baffle 7 level are just parallel to each other, and movable platform 2 outwards extends has impact portion, and force application track 10 is one and has the track of buckling of difference in height in vertical direction, and the lateral wall of entrance point is equipped with the opening, and the opening part is equipped with the scale, and the exit end extends to impact portion and sets up perpendicularly with impact portion. The movable platform 2 is provided with a limiting frame 4, the limiting frame 4 is formed by welding three iron bars, the height of the limiting frame 4 is 300mm, the width of the limiting frame 4 is 150mm, and a first object placing space for placing a first test block 12 is defined by the limiting frame 4 and the movable platform 2; a second placing space for placing the second test block 13 is formed between the baffle 7 and the fixed platform 3. Run through on the spacing frame 4 and install first tight screw in top, make it move towards first test block 12 through clockwise or anticlockwise rotation first tight screw in top to fix first test block 12 top tightly in first putting the object space, run through on the baffle 7 and install the tight screw in second top, make it rotate towards second test block 13 through clockwise or anticlockwise rotation second tight screw in top, thereby fix second test block 13 top tightly in the second puts the object space. Install a plurality of cylinders 8 along vertical direction in proper order on the installing support 1, the one end and the cylinder 8 butt of activity platform 2 to reduce when activity platform 2 receives to strike back along installing support 1 lapse, the frictional resistance between activity platform 2 and the installing support 1. To further reduce the friction between the movable platform 2 and the mounting bracket 1 when it falls, a layer of lubricating oil may be applied to the surface of the roller 8. The first block 12 and the second block 13 are connected by a sheet 14 of fibre-reinforced composite material during testing.
When the device for testing the bonding property of the fiber reinforced composite material reinforced concrete provided by this embodiment is used for testing, firstly, a test piece of the fiber reinforced composite material reinforced concrete is prepared, two ends of a sheet 14 of the fiber reinforced composite material are respectively adhered to the surfaces of a first test block 12 and a second test block 13, the first test block 12 is loaded into a first storage space, the second test block 13 is loaded into a second storage space, a balance weight is loaded in a balance box 5, so that the balance box 5 and the balance weight keep a balanced state with a movable platform 2 and the first test block 12, that is, the sheet 14 of the fiber reinforced composite material between the first test block 12 and the second test block 13 is not stressed, a small ball serving as an impact piece 15 is placed at an inlet of a force application rail 10, the impact piece 15 moves along the force application rail 10 and impacts an impact part of the movable platform 2, so that the interface between the sheet 14 of the fiber reinforced composite material and the first test block 12 or the second test block 13 is broken, the speed of the impact member 15 at the moment the impact member 15 hits the movable platform 2 and the speed of the movable platform 2 and the impact member 15 at the moment the movable platform 2 starts to fall after the fiber reinforced composite material sheet 14 is broken are measured by a high-speed camera. The energy actually consumed by the fiber reinforced composite material sheet 14 to break can be calculated by utilizing the energy conservation, and the bonding performance of the fiber reinforced composite material and the concrete connection is further represented.
Example 2
A method for testing the bonding performance of fiber reinforced composite reinforced concrete comprises the following steps:
the first test block 12 and the second test block 13 are connected by the fiber reinforced composite material sheet 14, the first test block 12 is loaded in the first storage space, the second test block 13 is loaded in the second storage space, and the balance weight is loaded in the balance box 5, so that the movable platform 2, the first test block 12, the balance box 5 and the balance weight are kept in a balanced state. The first test block 12 is clamped on the fixed platform 3 by adjusting the first clamping screw and the second test block 13 is clamped on the movable platform 2 by adjusting the second clamping screw.
The impact part of the impact piece 15 falling from the force application track 10 and impacting the movable platform 2 enables the interface of the fiber reinforced composite material sheet 14 and the first test block 12 or the second test block 13 to be broken and drives the movable platform 2 to fall, a first speed before the impact piece 15 impacts the impact part and a second speed when the impact piece 15 and the movable platform 2 begin to fall together are tested and recorded, and therefore the actual energy consumption of the interface breakage of the fiber reinforced composite material sheet and the first test block 12 or the second test block 13 can be obtained through calculation by utilizing an energy conservation formula. The steps of changing the mass of the impact member 15 or the initial position of the impact member 15 falling from the force application rail 10 and repeating the impact of the impact member 15 against the movable platform 2, a plurality of sets of data are recorded by a plurality of measurements.
As an alternative embodiment, the impact piece 15 directly falls from a specific height above the impact portion to impact the impact portion of the movable platform 2, so that the interface between the fiber reinforced composite material sheet 14 and the first test block 12 or the second test block 13 is broken and the movable platform 2 is driven to fall.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The utility model provides a fiber reinforced composite material reinforced concrete bonding performance testing arrangement which characterized in that includes:
the test device comprises a mounting bracket (1), wherein a movable platform (2) and a fixed platform (3) are sequentially mounted on the mounting bracket (1) from bottom to top, an impact part extends outwards from the movable platform (2), a first object placing space for placing a first test block (12) and a second object placing space for placing a second test block (13) are respectively formed on the movable platform (2) and the fixed platform (3), and the first test block (12) and the second test block (13) are connected through a fiber reinforced composite material sheet (14) during testing;
balance box (5), through connecting piece (6) with movable platform (2) are connected, dispose the balance weight in balance box (5), connecting piece (6) are walked around installing support (1) top makes balance box (5) with movable platform (2) are located the both sides of installing support (1), before external impact force is applyed in the test, balance box (5) with balance weight with movable platform (2) with first test block (12) keep balanced state.
2. The device for testing the bonding performance of the fiber reinforced composite material reinforced concrete according to claim 1, wherein a limiting frame (4) is arranged on the movable platform (2), and the limiting frame (4) and the movable platform (2) enclose the first storage space; still install baffle (7) on installing support (1), baffle (7) are located fixed platform (3) top, baffle (7) with form between fixed platform (3) the second puts the object space.
3. The device for testing the bonding performance of the fiber reinforced composite material reinforced concrete according to claim 2, wherein a first tightening screw penetrates through the limiting frame (4), and a second tightening screw penetrates through the baffle plate (7).
4. The device for testing the bonding performance of the fiber reinforced composite material reinforced concrete according to any one of claims 1 to 3, wherein a plurality of rollers (8) are sequentially arranged on the mounting bracket (1) along the vertical direction, and one end of the movable platform (2) is abutted to the rollers (8).
5. The apparatus for testing the bonding performance of fiber reinforced composite reinforced concrete according to any one of claims 1-3, wherein an auxiliary plate (9) is mounted on the mounting bracket (1), a force application rail (10) is mounted on the auxiliary plate (9), and an outlet end of the force application rail (10) extends to the impact portion.
6. The apparatus for testing the bonding property of fiber reinforced composite reinforced concrete according to claim 5, wherein the outlet end of the force application rail (10) is disposed perpendicular to the impact portion.
7. The device for testing the bonding performance of the fiber reinforced composite material reinforced concrete according to any one of claims 1 to 3, wherein a fixed pulley (11) is installed on the top of the installation support, and the connecting piece (6) is connected with the movable platform (2) through the fixed pulley (11).
8. The method for testing the bonding performance of the fiber reinforced composite material reinforced concrete is characterized by comprising the following steps of:
connecting a first test block (12) and a second test block (13) through a fiber reinforced composite material sheet (14), loading the first test block (12) in a first storage space, loading the second test block (13) in a second storage space, and loading a balance weight into a balance box (5) so as to keep the movable platform (2) and the first test block (12) in a balanced state with the balance box (5) and the balance weight;
and the impact part of the movable platform (2) is impacted by the impact piece (15) to enable the movable platform (2) to fall, and a first speed before the impact piece (15) impacts the impact part and a second speed when the impact piece (15) and the movable platform (2) start to fall together are tested and recorded, so that the energy consumption of the composite material sheet increased by the fibers is obtained.
9. The method for testing the bonding performance of the fiber reinforced composite material reinforced concrete according to claim 8, further comprising the step of clamping the first test block (12) on the fixed platform (3) by adjusting a first clamping screw and clamping the second test block (13) on the movable platform (2) by adjusting a second clamping screw.
10. The method for testing the bonding performance of the fiber reinforced composite material reinforced concrete according to claim 8, further comprising repeating the step of striking the movable platform (2) with the impact member (15) by changing the mass or the drop height of the impact member (15).
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| CN113959942B (en) * | 2021-10-28 | 2023-08-15 | 中铁建工集团有限公司 | Device and method for testing bending bonding strength between reinforcing material and concrete on site |
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| CN111257221B (en) | 2022-11-11 |
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