CN203849157U - Connecting structure for bond-slip test of FRP (fiber reinforced plastic) bar concrete - Google Patents
Connecting structure for bond-slip test of FRP (fiber reinforced plastic) bar concrete Download PDFInfo
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- CN203849157U CN203849157U CN201420246559.8U CN201420246559U CN203849157U CN 203849157 U CN203849157 U CN 203849157U CN 201420246559 U CN201420246559 U CN 201420246559U CN 203849157 U CN203849157 U CN 203849157U
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Abstract
The utility model discloses a connecting structure for a bond-slip test of FRP (fiber reinforced plastic) bar concrete. The connecting structure comprises concrete and two FRP bars, wherein a test piece assembly is arranged in the middle of the poured concrete and is formed by respectively inserting the two FRP bars into two ends of a casing; the other end of each FRP bar extends out of the casing; a bonding layer is arranged in the middle of the casing; at least two wedge-shaped bond blocks are arranged at the two ends of the casing in the casing along the direction of the FRP bars; the two FRP bars extend out of two ends of the concrete respectively; a sleeve is arranged at the matching position of the extending-out end of each FRP bar. According to the connecting structure, in the bond-slip test process of the FRP bar concrete, the stressed state of the concrete test piece is substantially consistent with the actual state, and data collected in the test confirms to the bonding performance of the FRP bar and the concrete test piece. The problem of unreliability of the test data caused by the concrete test piece under the action of external factors in a conventional one-way drawing test is solved.
Description
Technical field
The utility model relates to a kind of syndeton for concrete binding sliding test, especially relates to a kind of syndeton for the test of FRP reinforced concrete bond-slip.
Background technology
At present, along with the continuous application of compound substance in building structure, also more and more deep to the research of fibre-forming polymer muscle (FRP muscle).In the research of FRP muscle, the research of the bond-slip properties to FRP reinforced concrete is comparatively general.Conventionally the method for the bond-slip properties experimental study of FRP reinforced concrete is single reinforcement pull-out test and beam test.
For FRP tendon concrete structure, adhesion problem is most important.The compound substance forming as pultrusion, the influence factor that the adhesive property of FRP muscle in concrete is subject to is a lot, many researchists have launched a large amount of experimental studies to this, most tests are all the relation curves between research cohesive strength or loading end slippage and withdrawal force.
In the bond-slip test method of FRP reinforced concrete, desirable failure mode is to make FRP muscle extract destruction, but existing test method and structure actual loading situation are not inconsistent.
The general pull-out test that adopts in the time that FRP reinforced concrete is tested.Compared with beam test, test specimen making and the test unit of pull-out test are fairly simple, test findings is convenient to analyze, and also more responsive to the variation of FRP muscle resemblance, and therefore pull-out test is for a long time by the fundamental test method of doing FRP muscle adhesive property to study.It is name that single reinforcement pull-out test has two kinds of sample type: Losberg(Losberg, and it proposes this test method in 1963, and name according to this) test specimen and standard specimen.Compared with standard specimen, the advantage of Losberg drawing test specimen is, it distributes similarly to beam type test specimen adhesive section, is having adhesive section two ends without adhesive section, can avoid like this concrete deformation that pulling capacity is caused to count the slippage of muscle.Pull-out test method is the displacement that employing reaction frame 8 limits concrete 3 and FRP muscle 2 as shown in Figure 2, the unidirectional drawing FRP of loading end muscle 2.This test method causes the loading end concrete of concrete sample to bear the pressure onesize with FRP pulling force, does not conform to general member stress in practice.In addition because concrete Compressive Performance is good, concrete is done the used time and is not substantially produced crack being under pressure.And in Practical Project, the slippage meeting of muscle causes concrete bearing tension, corresponding meeting produces crack, so the data that above-mentioned test method obtains unreliable.
So in pull-out test, FRP muscle is placed on the central axis of test specimen, external part at muscle applies pulling force, by reaction frame 8, power is reached to concrete, FRP muscle concrete is around in pressured state, reduced the possibility that crack occurs, therefore improved cohesive strength, this does not conform to FRP tendon concrete structure actual forced status; And in beam test, fibre-forming polymer muscle concrete around, in tension state, makes just to have occurred crack under less stress, reduce cohesive strength, also do not conform to virtual condition.
Summary of the invention
The problem that the utility model exists for prior art provides a kind of syndeton of new research FRP reinforced concrete bond-slip properties.Adopt the utility model syndeton to prevent that preferably concrete in test is subject to the impact of extraneous factor, ensure that FRP muscle bond-slip properties is tested the data that obtain more approaching actual simultaneously, and test operation is simple, it is cheap a kind of syndeton for the test of FRP reinforced concrete bond-slip.
The purpose of this utility model is achieved through the following technical solutions:
For the syndeton of FRP reinforced concrete bond-slip test, comprising: concrete and two FRP muscle, test specimen assembly is located to the concrete middle part of building, the two ends that described test specimen assembly inserts respectively sleeve pipe by two FRP muscle; And the other end of two FRP muscle all leans out sleeve pipe, described sleeve pipe middle part is provided with tack coat; Sleeve pipe two ends are at least respectively equipped with two wedge key pieces along FRP muscle direction and form in sleeve pipe, and two described FRP muscle lean out from concrete two ends respectively; And the adapting position that two FRP muscle lean out end is respectively equipped with sleeve.
Described sleeve and FRP muscle bond by adhesive, in sleeve, pour into high strength structure glue.
Two described FRP muscle are provided with respectively isolation pipe collar near concrete edge place.
The two ends, inside of described sleeve pipe be provided with keyway and described wedge key piece suitable.
Described sleeve pipe is sleeve pipe made of iron.
The utility model compared with prior art has following advantages effect: the utility model can be guaranteed in the process of FRP reinforced concrete bond-slip test, the stress of concrete sample is with actual more consistent, and the data that gather in test also more meet the adhesive property between FRP muscle and concrete.Solve the effect that concrete sample in traditional unidirectional pull-out test is subject to extraneous factor and caused the unreliable of test figure.In addition, can also be applied to the pull-out test of different materials muscle.
Brief description of the drawings
Fig. 1 is sectional structure schematic diagram of the present utility model;
Fig. 2 is traditional unidirectional drawing sectional structure schematic diagram.
In figure: sleeve 1, FRP muscle 2, concrete 3, wedge key piece 4, tack coat 5, sleeve pipe 6, isolation pipe collar 7, reaction frame 8.
Embodiment
Below in conjunction with specific embodiment, the utility model is further elaborated, but protection domain of the present utility model is not limited by specific embodiment, is as the criterion with claims.In addition, under the prerequisite without prejudice to technical solutions of the utility model, within any change that those of ordinary skill in the art that the utility model is done easily realize or change all will fall into claim scope of the present utility model.
As shown in Figure 1, the utility model is for the syndeton of FRP reinforced concrete bond-slip test, comprise: sleeve 1, FRP muscle 2, concrete sample 3, wedge key piece 4, tack coat 5, sleeve pipe 6 made of iron, isolation pipe collar 7, test specimen assembly is located to concrete 3 middle parts of building, described test specimen assembly is inserted respectively the two ends of sleeve pipe (6) by two FRP muscle (2); And the other end of two FRP muscle (2) all leans out sleeve pipe (6), described sleeve pipe (6) middle part is provided with tack coat (5); Sleeve pipe (6) two ends are at least respectively equipped with two wedge key pieces (4) along FRP muscle direction and form in sleeve pipe (6), and two described FRP muscle 2 lean out from concrete 3 two ends respectively; And the adapting position that two FRP muscle 2 lean out end is respectively equipped with sleeve 1, this sleeve 1 bonds by adhesive with FRP muscle 2, in sleeve, pours into high strength structure glue.Two described FRP muscle 2 are also respectively equipped with isolation pipe collar 7 near concrete 3 edges.
When concrete test: choose universal testing machine, the sleeve 1 at the upper and lower two ends of syndeton of the present utility model is fixed on the ground tackle up and down of universal testing machine; Gathered the total displacement amount of whole syndeton by the data acquisition system (DAS) of universal testing machine, gathered respectively the relative shift of two FRP muscle 2 and concrete 3 by dial gauge, i.e. the slippage of FRP muscle 2 in concrete 3 test specimens.
Claims (5)
1. the syndeton of testing for FRP reinforced concrete bond-slip, comprise: concrete and two FRP muscle, it is characterized in that: test specimen assembly is located to concrete (3) middle part of building, described test specimen assembly is inserted respectively the two ends of sleeve pipe (6) by two FRP muscle (2); And the other end of two FRP muscle (2) all leans out sleeve pipe (6), described sleeve pipe (6) middle part is provided with tack coat (5); Sleeve pipe (6) two ends are at least respectively equipped with two wedge key pieces (4) along FRP muscle direction and form in sleeve pipe (6), and described two FRP muscle (2) lean out from concrete (3) two ends respectively; And the adapting position that two FRP muscle (2) lean out end is respectively equipped with sleeve (1).
2. the syndeton for the test of FRP reinforced concrete bond-slip according to claim 1, is characterized in that: described sleeve (1) bonds by adhesive with FRP muscle (2), in sleeve, pours into high strength structure glue.
3. the syndeton for the test of FRP reinforced concrete bond-slip according to claim 1, is characterized in that: described two FRP muscle (2) are also respectively equipped with isolation pipe collar (7) near concrete (3) edge.
4. the syndeton for FRP reinforced concrete bond-slip test according to claim 1, is characterized in that: the two ends, inside of described sleeve pipe (6) be provided with keyway and described wedge key piece (4) suitable.
5. the syndeton for the test of FRP reinforced concrete bond-slip according to claim 1, is characterized in that: described sleeve pipe (6) is sleeve pipe made of iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420246559.8U CN203849157U (en) | 2014-05-15 | 2014-05-15 | Connecting structure for bond-slip test of FRP (fiber reinforced plastic) bar concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420246559.8U CN203849157U (en) | 2014-05-15 | 2014-05-15 | Connecting structure for bond-slip test of FRP (fiber reinforced plastic) bar concrete |
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| CN203849157U true CN203849157U (en) | 2014-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420246559.8U Expired - Fee Related CN203849157U (en) | 2014-05-15 | 2014-05-15 | Connecting structure for bond-slip test of FRP (fiber reinforced plastic) bar concrete |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112161924A (en) * | 2020-09-30 | 2021-01-01 | 福建工程学院 | Testing device and method for tensile-shear bonding performance of basalt fiber board and concrete interface |
-
2014
- 2014-05-15 CN CN201420246559.8U patent/CN203849157U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112161924A (en) * | 2020-09-30 | 2021-01-01 | 福建工程学院 | Testing device and method for tensile-shear bonding performance of basalt fiber board and concrete interface |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20150515 |
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| EXPY | Termination of patent right or utility model |