CN107421882A - The steel fastener position friction testing arrangement and method of steel fastener FRP reinforcement techniques - Google Patents
The steel fastener position friction testing arrangement and method of steel fastener FRP reinforcement techniques Download PDFInfo
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- CN107421882A CN107421882A CN201710750193.6A CN201710750193A CN107421882A CN 107421882 A CN107421882 A CN 107421882A CN 201710750193 A CN201710750193 A CN 201710750193A CN 107421882 A CN107421882 A CN 107421882A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a kind of steel fastener position friction testing arrangement of steel fastener FRP reinforcement techniques and method, test device includes steel fastener position friction testing arrangement and stretching end tensioning force test device.First to steel fastener FRP combined reinforcement system tensioning, make FRP plate and concrete interface peeling-off, it is further continued for tensioning, steel fastener actuating pressure value is tested by micro pressure sensor, pass through stretching force sensor test stretching end stretching force, the principle and test curve finally balanced according to horizontal direction force is fitted, and draws the frictional force and failure mechanics coefficient of friction of steel fastener position FRP plate and concrete.Test device and method draw direct elaboration to the steel fastener position rubbing action mechanism in steel fastener FRP combined reinforcement systems, the steel fastener FRP joint reinforcement mechanisms of action are disclosed, to propose to steel fastener FRP joint reinforcements Practical Method of Designing and promoting the large-scale engineering applications of the joint reinforcement technology to establish solid theoretical foundation.
Description
Technical field
The present invention relates to fibrous composite reinforced steel concrete structure field, more particularly to a kind of steel fastener FRP to add
Gu the steel fastener position friction testing arrangement and method of technology.
Background technology
FRP (carbon fibre composite) reinforced concrete structure is a kind of direct reinforcing of effectively enhancing structure bearing capacity
Method, it in existing structure surface mount FRP cloth or sheet material by reaching the purpose that two kinds of materials cooperate with load, because of FRP
Material have specific strength and specific stiffness it is high, from heavy and light, anticorrosive good, heat-resisting and good endurance the characteristics of, such a reinforcement means by
Step is approved and is widely used in entity project by industry specialists technical staff.But find in the application, FRP material is with mixing
It is very low to coagulate the adhesion strength of soil, the problem of FRP peels off and existed strenthening member ductility difference too early easily occurs.For a kind of this steel
Fastener FRP joint reinforcement technologies are arisen at the historic moment, and the technology combines FRP outer patch method and mechanical anchor method.Steel fastener is effectively increased
FRP and concrete peeling resistance.The research of the mechanism of action is the premise of joint reinforcement method application, and research finds interface
Cementation, dowel action, to together constitute joint reinforcement combination stressed for the friction of steel fastener position.Interfacial adhesion acts on and pin
Effect can be obtained by the corresponding experiment of design respectively, but the friction of steel fastener position never has directly effective test side
Method.
The content of the invention
The purpose of the present invention is exactly to solve the above problems, it is proposed that a kind of steel fastener of steel fastener FRP reinforcement techniques
Position friction testing arrangement and method.The apparatus and method can directly measure the big of combined reinforcement system steel fastener position friction
It is small, so by acting on interfacial adhesion, comprehensive analysis of dowel action and steel fastener position friction, disclose steel fastener FRP connection
Reinforcement mechanism is closed, proposes Practical Method of Designing, is the large-scale engineering applications based theoretical of joint reinforcement technology.
To achieve these goals, the present invention uses following technological means：
A kind of steel fastener position friction testing arrangement of steel fastener FRP reinforcement techniques, including steel fastener position friction testing
Device and stretching end tensioning force test device；
Steel fastener position friction testing arrangement includes FRP plate, steel fastener, micro pressure sensor, counter-force steel plate；Institute
State FRP plate to be pasted on matrix, top effect steel fastener, counter-force steel plate is set on described steel fastener, and pass through between the two
Connector connects；And adhesive glue is also smeared between steel fastener and FRP plate, the micro pressure sensor is placed in steel fastener and anti-
Between power steel plate；
The stretching end tensioning force test device includes baffle plate, jack, tensioning force snesor, screw rod, counter-force seat, anchoring
Bolt and stretching end anchorage；Described baffle plate, counter-force seat, stretching end anchorage pass sequentially through screw rod and are connected, the clamping of stretching end anchorage
One end of FRP plate；The jack and tensioning force snesor are placed between counter-force seat and baffle plate, and the anchor bolt anchoring is anti-
Power seat is on matrix；Moved after promoting baffle plate when jack extends, baffle plate moves after driving stretching end anchorage by screw rod, and stretching force passes
The active force that puts on counter-force seat of sensor test jack, the also as stretching force of stretching end.
Further, described connector is peg.
Further, the micro pressure sensor two sides smear lubricant with reduce respectively with steel fastener and counter-force steel
The friction of plate contact surface.
Further, described tensioning force snesor, micro pressure sensor are connected with data processing equipment.
Further, described matrix is a hierarchic structure, and the FRP plate is pasted on higher level's step of matrix, and
Wherein one end is hanging, end connection stretching end anchorage.
Further, described stretching end anchorage and counter-force seat are fixed on subordinate's step of matrix.
Further, longitudinal direction of the described steel fastener along FRP plate is local pastes, and has preformed hole on steel fastener, supplies
Connector passes through.
The corresponding operating method in detail below of said apparatus：
Step (1)：Steel fastener position friction testing arrangement is installed
It is treated that matrix surface locally pastes steel button using glue FRP plate, the surface longitudinal of FRP plate is bonded in dabbing
Part, peg are passed by steel fastener preformed hole, and the upper surface processing of steel fastener is smooth and smears Huang in center placement top and bottom
The micro pressure sensor of oil, the upper surface of sensor add button counter-force steel plate, and counter-force steel plate is anchored on matrix using peg, most
Pretightning force is applied to peg afterwards, for actuating pressure on steel fastener, micro pressure sensor measures the pressure；
Step (2)：Stretching end tensioning force test device is installed
Counter-force seat is anchored on matrix by anchor bolt, loading end anchorage anchoring FRP plate one end, screw rod connection loading end
Anchorage and baffle plate, tensioning force snesor and jack subsequent application are between counter-force seat and baffle plate.Sensor and jack need to enter
The centering of row center；
Step (3)：
Start jack, by screw rod power transmission to steel fastener FRP combined reinforcement system tensioning, until FRP plate and matrix mix
Solidifying Soil Interface is peeling-off.The now combination stressed composition median surface cementation of joint reinforcement, dowel action are because of interface
Peel off and micro pressure sensor both sides smooth treatment is not transmitted frictional force and eliminated, only surplus steel fastener position friction.
Step (4)：
Continue stepless action jack, gather the micro pressure sensor test pressure in the friction testing arrangement of steel fastener position
Force value, gather the pressure value of the tensioning force snesor in stretching end tensioning force test device.Balanced according to horizontal direction force
Principle, the pressure value of tensioning force snesor is steel fastener position frictional force, and the fitting of steel fastener position frictional force and pressure is bent
Line slope is failure mechanics coefficient of friction.
Further, interfacial adhesion glue needs to conserve.
The beneficial effects of the invention are as follows：
The present invention proposes a kind of the steel fastener position friction testing arrangement and method of steel fastener FRP reinforcement techniques, uses this
Device and the method for testing of proposition can directly measure steel fastener position FRP and concrete in steel fastener FRP combined reinforcement systems
Frictional force and failure mechanics coefficient of friction, the rubbing action mechanism in steel fastener FRP combined reinforcement systems is drawn and directly explained
State, disclose the steel fastener FRP joint reinforcement mechanisms of action, to propose to steel fastener FRP joint reinforcements Practical Method of Designing and pushing away
The large-scale engineering applications for moving the joint reinforcement technology establish solid theoretical foundation.
Brief description of the drawings
The Figure of description for forming the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not form the improper restriction to the application.
Fig. 1 is test device schematic diagram of the present invention.
Wherein, 1 is baffle plate, and 2 be screw rod, and 3 be jack, and 4 be tensioning force snesor, and 5 be counter-force seat, and 6 be anchor bolt,
7 be stretching end anchorage, and 8 be FRP plate, and 9 be matrix, and 10 be peg, and 11 be micro pressure sensor, and 12 be steel fastener, and 13 be anti-
Power steel plate.
Fig. 2 is that steel fastener position of the present invention frictional force and pressure curve fitting are destroyed face coefficient of friction.
Embodiment
It is noted that described further below is all exemplary, it is intended to provides further instruction to the application.It is unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
The steel fastener position friction testing arrangement and method of a kind of steel fastener FRP reinforcement techniques disclosed by the invention；Test
Device includes steel fastener position friction testing arrangement and stretching end tensioning force test device.The operating method is first to steel fastener
FRP combined reinforcement system tensioning, make FRP plate and concrete interface peeling-off, be further continued for uniform tensioning, pass through steel fastener position
Micro pressure sensor test steel fastener actuating pressure value, pass through stretching force sensor test stretching end stretching force, last root
Principle and test curve fitting according to horizontal direction force balance, draw steel fastener position FRP plate and the frictional force of concrete
With failure mechanics coefficient of friction.The test device and method rub to the steel fastener position in steel fastener FRP combined reinforcement systems
The mechanism of action draws direct elaboration, discloses the steel fastener FRP joint reinforcement mechanisms of action, to propose to combine steel fastener FRP
Reinforce Practical Method of Designing and promote the large-scale engineering applications of the joint reinforcement technology to establish solid theoretical foundation.
The test device specifically used is as shown in figure 1, specific as follows：
Test device includes steel fastener position friction testing arrangement and stretching end tensioning force test device.
Steel fastener position friction testing arrangement includes FRP plate 3, steel fastener 12, micro pressure sensor 11, counter-force steel
Plate 13, peg 10.The FRP plate 8 is pasted on matrix 9, top effect steel fastener 12, is also applied between steel fastener 12 and FRP plate 8
Adhesive glue is smeared, the micro pressure sensor 11 is placed between steel fastener 12 and counter-force steel plate 13, micro pressure sensor 11
For the equal coating butter in two sides to reduce the friction with steel fastener 12 and the contact surface of counter-force steel plate 13 respectively, the peg 10 anchors counter-force
Steel plate 13 is on matrix 9.
The stretching end tensioning force test device includes baffle plate 1, jack 3, tensioning force snesor 4, screw rod 2, counter-force seat
5th, anchor bolt 6, stretching end anchorage 7.The jack 3 and tensioning force snesor 11 are placed between counter-force seat 5 and baffle plate 1,
The screw rod 2 acts on baffle plate 1 and stretching end anchorage 7 respectively, and the anchor bolt 6 anchors counter-force seat 5 in matrix 9.Jack 3 is stretched
Moved after promoting baffle plate 1 when long, baffle plate 1 moves after driving stretching end anchorage 7 by screw rod 2, and tensioning force snesor 4 tests jack 3
The active force put on counter-force seat 5, the also as stretching force of stretching end.
Further, described tensioning force snesor, micro pressure sensor are connected with data processing equipment；At the data
Reason device is handled the data of tensioning force snesor, micro pressure sensor collection.
Further, described matrix is a hierarchic structure, and the FRP plate is pasted on higher level's step of matrix, and
Wherein one end is hanging, end connection stretching end anchorage；Stretching end anchorage and counter-force seat are fixed on subordinate's step of matrix；It is very heavy
Top 3 and baffle plate 1 are arranged on the side of matrix.
Further, longitudinal direction of the described steel fastener along FRP plate is local pastes, and has preformed hole on steel fastener, supplies
Connector passes through.
The method of test device specific implementation, comprises the following steps.
Step (1)：
Effect friction testing arrangement in steel fastener position is installed.It is treated that the surface of matrix 9 uses bonding glue in dabbing
FRP plate 8, the surface longitudinal of FRP plate 8 locally paste steel fastener 12, and peg 10 is passed by the preformed hole of steel fastener 12, steel fastener 12
Upper surface processing it is smooth and center place the equal coating butter in top and bottom micro pressure sensor 11, the upper table of sensor 11
Face adds button counter-force steel plate 13, and counter-force steel plate 13 is anchored on matrix 9 using peg 10, finally applies pretightning force to peg 10, makees
With pressure on steel fastener 12, micro pressure sensor 11 measures the pressure.Interfacial adhesion glue needs to conserve.
Step (2)：
Stretching end tensioning force test device is installed.Counter-force seat 5 is anchored on matrix 9 by anchor bolt 6, loading end anchorage
7 anchoring FRP plate 8 one end, screw rod 2 connect loading end anchorage 7 and baffle plate 1, tensioning force snesor 4 and the subsequent application of jack 3 in
Between counter-force seat 5 and baffle plate 1.Sensor 4 and jack 3 need to carry out center centering.
Step (3)：
Start jack 3, by the power transmission of screw rod 3 to steel fastener FRP combined reinforcement system tensioning, until FRP plate 8 and matrix
9 concrete interfaces are peeling-off.The now combination stressed composition median surface cementation of joint reinforcement, dowel action are because interface
Stripping and the both sides smooth treatment of micro pressure sensor 11 do not transmit frictional force and eliminate, only surplus steel fastener position friction.
Step (4)：
Continue stepless action jack 3, gather the micro pressure sensor 11 in the position friction testing arrangement of steel fastener 12
Test pressure value, gather the pressure value of the tensioning force snesor 4 in stretching end tensioning force test device.According to horizontal direction force
The principle of balance, the pressure value of tensioning force snesor 4 are steel fastener position frictional force, steel fastener position frictional force and pressure
Matched curve slope is failure mechanics coefficient of friction.
As can be seen from the above description, the application the above embodiments realize following technique effect：
The present invention proposes a kind of the steel fastener position friction testing arrangement and method of steel fastener FRP reinforcement techniques, uses this
Device and the method for testing of proposition can directly measure steel fastener position FRP and concrete in steel fastener FRP combined reinforcement systems
Frictional force and failure mechanics coefficient of friction, the rubbing action mechanism in steel fastener FRP combined reinforcement systems is drawn and directly explained
State, disclose the steel fastener FRP joint reinforcement mechanisms of action, to propose to steel fastener FRP joint reinforcements Practical Method of Designing and pushing away
The large-scale engineering applications for moving the joint reinforcement technology establish solid theoretical foundation.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (8)
1. the steel fastener position friction testing arrangement of a kind of steel fastener FRP reinforcement techniques, it is characterised in that including steel fastener position
Friction testing arrangement and stretching end tensioning force test device；
Steel fastener position friction testing arrangement includes FRP plate, steel fastener, micro pressure sensor and counter-force steel plate；It is described
FRP plate is pasted on matrix, top effect steel fastener, sets counter-force steel plate on described steel fastener, and pass through company between the two
Fitting connects；And adhesive glue is also smeared between steel fastener and FRP plate, the micro pressure sensor is placed in steel fastener and counter-force
Between steel plate；
The stretching end tensioning force test device includes baffle plate, jack, tensioning force snesor, screw rod, counter-force seat, anchor bolt
With stretching end anchorage；Described baffle plate, counter-force seat, stretching end anchorage pass sequentially through screw rod and are connected, stretching end anchorage clamping FRP plate
One end；The jack and tensioning force snesor are placed between counter-force seat and baffle plate, and the anchor bolt anchors counter-force seat
In on matrix；Moved after promoting baffle plate when jack extends, baffle plate moves after driving stretching end anchorage by screw rod, tensioning force snesor
The active force that puts on counter-force seat of test jack, the also as stretching force of stretching end.
2. a kind of steel fastener position friction testing arrangement of steel fastener FRP reinforcement techniques as claimed in claim 1, its feature exist
In described connector is peg.
3. a kind of steel fastener position friction testing arrangement of steel fastener FRP reinforcement techniques as claimed in claim 1, its feature exist
Lubricant, which is smeared, in, the micro pressure sensor two sides is rubbed respectively with steel fastener and counter-force steel plate contact surface with reducing
Wipe.
4. a kind of steel fastener position friction testing arrangement of steel fastener FRP reinforcement techniques as claimed in claim 1, its feature exist
In described tensioning force snesor, micro pressure sensor are connected with data processing equipment.
5. a kind of steel fastener position friction testing arrangement of steel fastener FRP reinforcement techniques as claimed in claim 1, its feature exist
In described matrix is a hierarchic structure, and the FRP plate is pasted on higher level's step of matrix, and wherein one end is hanging, should
End connection stretching end anchorage.
6. a kind of steel fastener position friction testing arrangement of steel fastener FRP reinforcement techniques as claimed in claim 1, its feature exist
In described stretching end anchorage and counter-force seat are fixed on subordinate's step of matrix.
7. a kind of steel fastener position friction testing arrangement of steel fastener FRP reinforcement techniques as claimed in claim 1, its feature exist
In longitudinal direction of the described steel fastener along FRP plate is local to be pasted, and has preformed hole on steel fastener, is passed through for connector.
8. the operating method of the steel fastener position friction testing arrangement of the steel fastener FRP reinforcement techniques described in claim 1, it is special
Sign is, as follows：
Step (1)：Steel fastener position friction testing arrangement is installed
It is treated that matrix surface locally pastes steel fastener using glue FRP plate, the surface longitudinal of FRP plate is bonded in dabbing,
Steel fastener upper surface processing it is smooth and center place the equal coating butter in top and bottom micro pressure sensor, sensor it is upper
Surface adds button counter-force steel plate, and counter-force steel plate is anchored on matrix using peg, finally applies pretightning force to peg, and actuating pressure exists
On steel fastener, micro pressure sensor measures the pressure；
Step (2)：Stretching end tensioning force test device is installed
Counter-force seat is anchored on matrix by anchor bolt, loading end anchorage anchoring FRP plate one end, screw rod connection loading end anchorage
And baffle plate, tensioning force snesor and jack subsequent application are between counter-force seat and baffle plate；During sensor and jack need to be carried out
Heart centering；
Step (3)：
Start jack, by screw rod power transmission to steel fastener FRP combined reinforcement system tensioning, until FRP plate and original concrete
Interface is peeling-off；The now combination stressed composition median surface cementation of joint reinforcement, dowel action are because the stripping at interface
And micro pressure sensor both sides smooth treatment is not transmitted frictional force and eliminated, only surplus steel fastener position friction；
Step (4)：
Continue stepless action jack, gather the micro pressure sensor test pressure in the friction testing arrangement of steel fastener position
Value, gather the pressure value of the tensioning force snesor in stretching end tensioning force test device；The original balanced according to horizontal direction force
Then, the pressure value of tensioning force snesor is steel fastener position frictional force, the matched curve of steel fastener position frictional force and pressure
Slope is failure mechanics coefficient of friction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710750193.6A CN107421882B (en) | 2017-08-28 | 2017-08-28 | Steel fastener part friction testing device and method for steel fastener FRP reinforcement technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710750193.6A CN107421882B (en) | 2017-08-28 | 2017-08-28 | Steel fastener part friction testing device and method for steel fastener FRP reinforcement technology |
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| CN107421882A true CN107421882A (en) | 2017-12-01 |
| CN107421882B CN107421882B (en) | 2020-04-03 |
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| CN106153233A (en) * | 2016-06-24 | 2016-11-23 | 山东大学 | Stretch-draw force test device under a kind of prestressing force strand tapered anchorage anchor |
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|---|---|---|---|---|
| JPH06109621A (en) * | 1992-09-28 | 1994-04-22 | Kinugawa Rubber Ind Co Ltd | Rotational friction resistance test device |
| CN102141505A (en) * | 2011-01-05 | 2011-08-03 | 北京交通大学 | Device and method for measuring friction coefficient under high temperature environment |
| CN103048264A (en) * | 2013-01-22 | 2013-04-17 | 江苏华通工程检测有限公司 | Anchorage performance detection testing apparatus and method for carbon fiber adhesion reinforcement |
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| CN107421882B (en) | 2020-04-03 |
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