CN111965004A - Shearing experimental device under FRP (fiber reinforced Plastic) bar tension state - Google Patents
Shearing experimental device under FRP (fiber reinforced Plastic) bar tension state Download PDFInfo
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- CN111965004A CN111965004A CN202010570885.4A CN202010570885A CN111965004A CN 111965004 A CN111965004 A CN 111965004A CN 202010570885 A CN202010570885 A CN 202010570885A CN 111965004 A CN111965004 A CN 111965004A
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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
- G01N3/02—Details
- G01N3/04—Chucks
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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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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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
- G01N2203/0003—Steady
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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
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a shearing experimental device for FRP (fiber reinforced plastic) reinforcements in a tension state, which comprises a test piece, wherein two ends of the test piece are anchored in an anchorage device with threads at the end part through epoxy resin, the anchorage device is installed in the test device in a matching way, the test device comprises a fixed supporting part and a middle shearing part, the fixed supporting part comprises two symmetrically arranged steel plates and four supporting long screws between the two steel plates, a hole is formed in the center of each steel plate and penetrates through the short screw, and the short screws are connected with the test piece through sleeves with internal threads at two ends; the shearing part is arranged in the middle of the test piece and comprises two concave clamps and two convex clamping pieces, and the clamps and the clamping pieces are both provided with a hole passage for the test piece to pass through and are tightly attached to the test piece through bolts. The invention ensures that the shearing performance of the test piece under the prestress can be tested, the determined prestress can be applied through the rotary sleeve, and the accuracy and precision of the test are improved.
Description
Technical Field
The invention relates to a shearing experimental device for FRP (fiber reinforced plastic) reinforcements in a tension state, belonging to the field of civil engineering.
Background
FRP, fiber reinforced composite plastic, existing CFRP, GFRP, AFRP, BFRP and the like. The FRP composite material is a high-performance material formed by mixing a fiber material and a matrix material according to a certain proportion. Among them, GFRP is classified into polyester glass fiber reinforced plastics, epoxy glass fiber reinforced plastics, phenol glass fiber reinforced plastics, etc., depending on the kind of the resin used. Generally, FRP has the characteristics of light weight, hardness, non-conductivity, high mechanical strength, less recycling, corrosion resistance and the like. The research on FRP ribs in China starts late but develops rapidly, and the research and development on the application technology of FRP materials in civil engineering begin from the middle of the nineties of the twentieth century, carbon fiber sheet reinforced concrete structure technology begins to be introduced in 1997, and related research begins. The FRP tendon is subjected to different degrees of experimental study by colleges and scientific research institutions such as Qinghua university, Tongji university, Tianjin university, southeast university, national industrial building diagnosis and modification engineering center and the like, and certain achievements are obtained. The southeast university has also designed and built the first high-performance CFRP cable-stayed bridge in china. However, the shearing performance of the FRP rib material in a prestressed state is rarely studied, and in order to make up for the blank in the aspect, the experimental device is designed for experiments.
Disclosure of Invention
The invention provides a shearing experimental device for FRP (fiber reinforced plastic) reinforcements in a tension state, aiming at the defects in the prior art and solving the problems in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention relates to a shearing experimental device for FRP (fiber reinforced plastic) reinforcement materials in a tension state, which comprises a test piece, wherein two ends of the test piece are anchored in an anchorage device with threads at the end part through epoxy resin; the fixed support component comprises two symmetrically arranged steel plates and four support long screws between the two steel plates, a hole is formed in the center of each steel plate and penetrates through the short screw, and the short screw is connected with the test piece through a sleeve with internal threads turned at two ends; the shearing part is arranged in the middle of the test piece and comprises two concave clamps and two convex clamping pieces, and the concave clamps and the convex clamping pieces are all provided with a hole passage for the test piece to pass through and are tightly attached to the test piece through bolts.
As an improvement of the invention, the steel plate is respectively provided with a central hole and an offset hole at the center and four corners, the central hole at the center is matched with the short screw rod, and the offset holes at the four corners are matched with the long screw rod.
As an improvement of the invention, the shearing device comprises two concave clamps and two convex clamping pieces, wherein the concave clamping pieces and the convex clamps are respectively provided with a pore passage for a test piece to pass through, and are tightly attached by bolts to clamp the test piece.
As an improvement of the invention, both sides of the long screw rod penetrate through the steel plate through the eccentric holes, and each side is provided with two nuts for fixing the long screw rod and the steel plate.
As an improvement of the invention, the left half section and the right half section in the sleeve are respectively provided with positive and negative threads which are respectively matched with the test piece and the short screw rod.
As an improvement of the invention, the anchorage devices at the two ends of the test piece are both provided with internal threads and are connected with the sleeve through occlusion of the positive and negative threads.
As an improvement of the invention, the short screw rod passes through the steel plate through the central hole, and a nut is arranged near the outer side to fix the short screw rod and the steel plate; one side of the short screw is connected with the sleeve through occlusion of the positive and negative threads.
As an improvement of the invention, the concave clamp and the convex clamping piece are provided with semicircular pore channels on one side, the two concave clamps or the convex clamping pieces can be spliced by bolts to form a circular pore channel, and the circular pore channel is matched with the rib material.
As an improvement of the invention, the non-convex part of the convex clip is spliced with the concave part of the concave clamp.
As an improvement of the invention, a gap of 1mm is formed at the splicing position of the concave clamp and the left and right concave-convex parts of the convex clamping piece.
Compared with the prior art, the invention has the following beneficial effects because the technology is adopted:
the invention discloses a shearing experimental device for an FRP (fiber reinforced Plastic) rib in a tension state, which can solve the loading process of applying prestress to the FRP rib and carrying out a shearing performance test on the FRP rib in the prestress state, and simultaneously ensure that a test piece is sheared and damaged, and the magnitude of the applied prestress is easy to measure.
The invention adopts screw connection and sleeve connection, and can conveniently adjust the magnitude of applied prestress to adapt to different degrees of prestress. The small gap between the clamp and the clamping piece can ensure that the test piece is sheared and damaged in the loading process; the invention has simple structure and stable and reliable use, can successfully solve the problem of applying prestress to the FRP reinforcement when being applied to the shear performance test of the FRP reinforcement in a prestress state, effectively improves the accuracy of the test structure and greatly improves the success rate of the test. In addition, the invention can be disassembled, is extremely simple and convenient to transport and assemble, and can be repeatedly used for many times.
Drawings
FIG. 1 is a schematic structural diagram of a shearing experimental device under the condition of FRP tendon tension;
FIG. 2 is a schematic structural view of a stationary support member;
fig. 3 is a schematic view of the structure of the shearing module.
In the figure: 1. the device comprises a fixed steel plate, 1-1 parts of steel plate, 1-2 parts of inclined holes, 1-3 parts of central holes, 2 parts of sleeves, 3 parts of anchors, 4 parts of test pieces, 5 parts of long screws, 6 parts of concave clamps, 6-1 parts of clamp holes, 7 parts of convex clamping pieces, 7-1 parts of clamping piece holes and 8 parts of short screws.
Detailed Description
The technical solutions provided by the present invention will be described in detail below with reference to specific examples, and it should be understood that the following specific embodiments are only illustrative of the present invention and are not intended to limit the scope of the present invention.
Example 1:
the experimental device for shearing FRP reinforcement materials in a tension state comprises a test piece 4, wherein the test piece 4 is fixedly connected in the experimental device after being filled with glue by an anchorage device 3 and is matched with circular pore passages formed by connecting two concave clamps 6 and two convex clamping pieces 7 through bolts; the experimental device comprises two fixed steel plates 1 which are symmetrically arranged and fixed supporting parts which are formed by four parallel long screw rods 5 which are distributed at four corners, and also comprises a shearing part which is formed by connecting a concave clamp 6 and a convex clamping piece 7 through bolts in a clinging manner.
Example 2:
as an improvement of the invention, referring to FIG. 2, the fixing and supporting component comprises two steel plates 1-1, four corners of the steel plate 1-1 are provided with four eccentric holes 1-2, the center of the steel plate 1-1 is provided with a center hole 1-3, the long screw 5 is connected and fixed through the eccentric holes 1-2 by nuts, the short screw 8 is connected and fixed with the steel plate 1-1 through the center hole 1-3 by nuts, and is sequentially connected with an anchorage device 3 and a test piece 4 to form a stable fixing and supporting.
The rest of the structural features and advantages are exactly the same as those of embodiment 1
Example 3:
as an improvement of the invention, the test piece 4 is fixedly connected by the anchorage device 3 after glue pouring and is matched with the circular pore passages of the two concave clamps 6 and the two convex clamping pieces 7 after bolt connection. The sleeve pipes 2 on the two sides of the short screw 8 can apply prestress with different sizes to the FRP rib materials through different rotation numbers. The two sides of the short screw 8 are connected with the parallel symmetrical steel plates 1-1 through nuts to achieve the purpose of fixing the reinforcing bars. The anchorage devices 3 at the two ends of the test piece 4 are turned with thread sections and are connected with the sleeve 2 through occlusion of positive and negative threads, so that the purpose of fixation is realized.
The remaining structural features and advantages are exactly the same as those of embodiment 1.
Example 4:
as an improvement of the invention, referring to FIG. 3, a gap of 1mm is formed at the splicing position of the concave clamp 6 and the left and right sides of the convex clamping piece 7, so that the pure shearing purpose is realized. The two concave clamps 6 penetrate through the clamp holes 6-1 through bolts to be tightly connected; the two convex clamps 7 are tightly connected through the clamp holes 7-1 by bolts. The concave clamp 6 and the convex clamping piece 7 are provided with semicircular channels on one side, the two concave clamps 6 or the convex clamping pieces 7 can be spliced into a circular channel through bolts, and the circular channel is matched with the rib material. The purpose of testing FRP rib materials with different diameters can be achieved by designing various semicircular pore canals with different diameters.
The rest of the structure and advantages are exactly the same as those of embodiment 1.
The invention can also combine at least one of the technical characteristics described in the embodiments 2, 3 and 4 with the embodiment 1 into a new embodiment.
The invention has the following specific using process:
taking the actual shear test of the FRP reinforcement in the prestressed state as an example, the shear member at the test piece 4 needs to be installed before the shear test in the prestressed state. Should carry out fixed connection with test piece 4 and ground tackle 3 through the encapsulating earlier before the experiment, short screw rod 8 passes through sleeve 2 and links to each other with ground tackle 3, will arrange earlier and accomplish concave type anchor clamps 6 and the protruding type clamping piece 7 of test piece one side, puts into corresponding semi-circular pore with test piece 4 afterwards, passes through bolted connection with protruding type clamping piece 7 and the concave type anchor clamps 6 of remaining one side, puts into pulling force experiment fixed part. And then, arranging to finish fixed support, firstly taking the fixed steel plate 1 on one side, rotating the first nut on each side on four long screws 5 according to the required length, and then penetrating the long screws 5 through the eccentric holes 1-2 on the fixed steel plate 1. The second nut on each side is then rotated to complete the fixed support arrangement. And then, connecting and fixing the shearing part through the central hole 1-3 by using a nut, and finally completing the installation of the steel plate 1 on the other side. The purpose of controlling the size of the prestress through the number of turns can be achieved by rotating the sleeve 3.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention should be defined by the claims, and equivalents including technical features of the claims, i.e., equivalent modifications within the scope of the present invention.
Claims (10)
1. The utility model provides a shearing experimental apparatus under FRP muscle material tension state, includes the test piece, and the epoxy anchor is passed through at the test piece both ends in the screwed ground tackle of tip, and the ground tackle cooperation is installed in test device, its characterized in that: the test device comprises a fixed support part and a middle shearing part; the fixed supporting component comprises two symmetrically arranged steel plates and four supporting long screw rods between the two steel plates, and the center of each steel plate is penetrated with a short screw rod; the short screw is connected with the test piece through a sleeve with internal threads turned at two ends; the middle part of the test piece penetrates through the shearing part; the shearing part comprises two concave clamps and two convex clamping pieces; the concave clamp and the convex clamping piece are completely spliced through the bolt.
2. The FRP rib material shearing experimental device in the tension state as claimed in claim 1, which is characterized in that: the steel plate is provided with a central hole and offset holes at the center and four corners respectively, the central hole at the center is matched with the short screw, and the offset holes at the four corners are matched with the long screw.
3. The FRP rib material shearing experimental device in the tension state as claimed in claim 1, which is characterized in that: the concave clamping piece and the convex clamp are respectively provided with four holes, bolts penetrate through the holes, and the concave clamping piece and the convex clamp are spliced into a complete concave clamping piece and a complete convex clamp.
4. The FRP rib material shearing experimental device in the tension state as claimed in claim 2, wherein: the long screw rod both sides all pass the steel sheet through the inclined to one side hole, and there are two nuts in every side, fixed long screw rod and steel sheet.
5. The FRP rib material shearing experimental device in the tension state as claimed in claim 1, which is characterized in that: the left half section and the right half section in the sleeve are respectively provided with positive and negative internal threads which are respectively matched with the test piece and the short screw rod.
6. The FRP rib material shearing experimental device in the tension state as claimed in claim 1, which is characterized in that: and the anchors at the two ends of the test piece are provided with thread sections and are connected with the sleeve through occlusion of the positive and negative threads.
7. The FRP rib material shearing experimental device in the tension state as claimed in claim 2, wherein: the short screw rod penetrates through the center of the steel plate through the central hole, a nut is arranged close to the outer side of the short screw rod and fixes the short screw rod and the steel plate, and one side of the short screw rod is connected with the sleeve through occlusion of the positive and negative threads.
8. The FRP rib material shearing experimental device in the tension state as claimed in claim 3, wherein: the concave clamp and the convex clamping piece are respectively provided with a semicircular pore channel, the two concave clamps or the convex clamping pieces can be spliced by bolts to form a circular pore channel, and the circular pore channel is matched with the rib material.
9. The FRP rib material shearing experimental device in the tension state as claimed in claim 3, wherein: the non-convex part of the convex clamping piece is spliced with the concave part of the concave clamp.
10. The FRP rib material shearing experimental device in the tension state as claimed in claim 3, wherein: the concave clamp and the left and right concave-convex splicing positions of the convex clamping pieces are provided with gaps of 1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010570885.4A CN111965004A (en) | 2020-06-19 | 2020-06-19 | Shearing experimental device under FRP (fiber reinforced Plastic) bar tension state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010570885.4A CN111965004A (en) | 2020-06-19 | 2020-06-19 | Shearing experimental device under FRP (fiber reinforced Plastic) bar tension state |
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| Publication Number | Publication Date |
|---|---|
| CN111965004A true CN111965004A (en) | 2020-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010570885.4A Pending CN111965004A (en) | 2020-06-19 | 2020-06-19 | Shearing experimental device under FRP (fiber reinforced Plastic) bar tension state |
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| CN (1) | CN111965004A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105716949A (en) * | 2016-04-13 | 2016-06-29 | 桂林理工大学 | Method for testing stress relaxation of FRP (fiber reinforced plastic) fabric |
| CN106840917A (en) * | 2016-12-27 | 2017-06-13 | 广东工业大学 | It is a kind of to consider the simple shear test device that tension reinforcement cleaves power |
| CN110763563A (en) * | 2019-11-06 | 2020-02-07 | 东莞理工学院 | Research method of FRP rib bonding slippage relation based on Poisson effect |
| CN112834329A (en) * | 2021-03-18 | 2021-05-25 | 吉林建筑大学 | Steel plate clamp and method for FRP plate reinforcement test |
-
2020
- 2020-06-19 CN CN202010570885.4A patent/CN111965004A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105716949A (en) * | 2016-04-13 | 2016-06-29 | 桂林理工大学 | Method for testing stress relaxation of FRP (fiber reinforced plastic) fabric |
| CN106840917A (en) * | 2016-12-27 | 2017-06-13 | 广东工业大学 | It is a kind of to consider the simple shear test device that tension reinforcement cleaves power |
| CN110763563A (en) * | 2019-11-06 | 2020-02-07 | 东莞理工学院 | Research method of FRP rib bonding slippage relation based on Poisson effect |
| CN112834329A (en) * | 2021-03-18 | 2021-05-25 | 吉林建筑大学 | Steel plate clamp and method for FRP plate reinforcement test |
Non-Patent Citations (1)
| Title |
|---|
| 姬瑞璞, 张宁远: "预应力状态下FRP 筋材剪切性能的试验研究", 《中国市政工程》 * |
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Application publication date: 20201120 |
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