CN108801906B - Loading device and method for bonding slip performance test - Google Patents
Loading device and method for bonding slip performance test Download PDFInfo
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- CN108801906B CN108801906B CN201810574150.1A CN201810574150A CN108801906B CN 108801906 B CN108801906 B CN 108801906B CN 201810574150 A CN201810574150 A CN 201810574150A CN 108801906 B CN108801906 B CN 108801906B
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- supporting plate
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- spherical hinge
- steel bar
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- 238000011068 loading method Methods 0.000 title claims abstract description 63
- 238000011056 performance test Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 8
- 238000012360 testing method Methods 0.000 claims abstract description 111
- 238000009434 installation Methods 0.000 claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims description 30
- 239000010959 steel Substances 0.000 claims description 30
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 21
- 238000006073 displacement reaction Methods 0.000 claims description 20
- 230000003014 reinforcing effect Effects 0.000 claims description 13
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005452 bending Methods 0.000 abstract description 10
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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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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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a loading device and a loading method for a bonding slip performance test, wherein the loading device comprises the following steps: loading a frame; the loading frame comprises a supporting leg, a first supporting plate, a second supporting plate and a third supporting plate; the first supporting plate, the second supporting plate and the third supporting plate are sequentially and fixedly arranged on the supporting leg; coaxial mounting through holes are formed in the first support plate, the second support plate and the third support plate; a center-penetrating spherical hinge is fixedly arranged on the first supporting plate, and a center hole of the center-penetrating spherical hinge is coaxial with the mounting through hole on the first supporting plate; the installation through hole of the third supporting plate is internally provided with a spherical hinge connecting rod with a spherical hinge, and the spherical hinge connecting rod can be connected with the clamping head of the testing machine. The loading device for the bonding slip performance test can release bending moment through self-centering, and can improve the accuracy of the bonding slip performance test.
Description
Technical Field
The invention belongs to the technical field of civil engineering or the technical field of test research on binding slip performance of reinforced steel bars and concrete, and particularly relates to a loading device and method for the test of binding slip performance.
Background
The reinforced bar and the concrete structure can work together and can play the advantages of the respective materials, and the key is that the method for measuring the binding force between the reinforced bar and the concrete in practice generally adopts a cube center pull test piece recommended in the concrete structure test method standard.
For the existing tester clamp, the requirement of clamping a test piece of the tester is often required to be met through a test loading device, a reinforcing steel bar is generally embedded in the center of concrete, and a load is applied to one end of the reinforcing steel bar to measure the bonding stress and relative slippage in the bonding performance of the reinforcing steel bar and the concrete. The existing test loading device generally has the problem that bending moment generated during loading connection cannot be released, so that the accuracy of the bonding slip performance test is reduced; in addition, most of the existing loading devices indirectly load through the frame of the loading device, and the intermediate loss of the indirect loading can reduce the loading precision.
Disclosure of Invention
The invention aims to provide a loading device and a loading method for a bonding slip performance test, so as to solve the technical problems. The loading device for the bonding slip performance test can release bending moment through self-centering, and can improve the accuracy of the bonding slip performance test.
In order to achieve the above purpose, the invention adopts the following technical scheme:
A loading device for a bond slip performance test, comprising: loading a frame; the loading frame comprises a supporting leg, a first supporting plate, a second supporting plate and a third supporting plate; the first supporting plate, the second supporting plate and the third supporting plate are sequentially and fixedly arranged on the supporting leg; coaxial mounting through holes are formed in the first support plate, the second support plate and the third support plate; the first supporting plate is fixedly provided with a center-penetrating spherical hinge, a center hole of the center-penetrating spherical hinge is coaxial with an installation through hole in the first supporting plate, the center-penetrating spherical hinge is positioned between the first supporting plate and the second supporting plate, a reinforcing steel bar at the upper end of the test piece can penetrate through the center hole of the center-penetrating spherical hinge to enter the installation through hole in the first supporting plate, and a reinforcing steel bar at the lower end of the test piece can enter the installation through hole of the second supporting plate; the installation through hole of the third supporting plate is internally provided with a spherical hinge connecting rod with a spherical hinge, and the spherical hinge connecting rod can be connected with the clamping head of the testing machine.
Further, the lower extreme of the through ball hinge is provided with a limit bolt, and the limit bolt is used for circumferentially limiting the concrete of the test piece.
Further, a local reinforcing plate is arranged at the mounting through hole of the third supporting plate.
Further, the same side of first backup pad and second backup pad is provided with the opening respectively, and the opening is through the installation through-hole in first backup pad and the second backup pad respectively.
Further, the support leg comprises 4 screws; the 4 screws are respectively connected with the first support plate, the second support plate and the third support plate through nuts and gaskets.
Further, a first bracket is arranged at the lower end of the center hole of the through ball hinge, and a first displacement meter is arranged on the first bracket.
Further, a second bracket is arranged at the installation through hole of the second supporting plate, and a second displacement meter is arranged on the second bracket.
Further, the device also comprises a test piece and a testing machine; the test piece comprises a steel bar and concrete, wherein the steel bar is embedded into the concrete, both ends of the steel bar extend out of the concrete, the upper end of the steel bar penetrates out of a center hole of the through spherical hinge and an installation through hole of the first support plate to be fixedly connected with an upper chuck of the testing machine, and the lower end of the steel bar extends into an installation through hole of the second support plate to be fixedly connected with a spherical hinge connecting rod of the third support plate.
The loading method for the binding slip performance test is based on any one of the loading devices, the test piece comprises a steel bar and concrete, the steel bar is embedded into the concrete, and both ends of the steel bar extend out of the concrete, and the loading method comprises the following specific steps:
Step 1, placing a test piece to be loaded between a first support plate and a second support plate, wherein a reinforcing steel bar at the upper end of the test piece stretches into a central hole penetrating through a spherical hinge and penetrates out of an installation through hole of the first support plate to be connected with an upper chuck of a testing machine, and a reinforcing steel bar at the lower end of the test piece stretches into an installation hole of the second support plate;
step 2, connecting a spherical hinge connecting rod arranged on a third supporting plate with a lower chuck of the testing machine;
Step 3, adjusting the center-penetrating spherical hinge and the spherical hinge connecting rod to enable the steel bars of the test piece to be centered with the upper clamping head and the lower clamping head of the testing machine;
Step 4, installing a first displacement meter between the center-penetrating spherical hinge and the concrete of the test piece, and installing a second displacement meter between the second supporting plate and the concrete of the test piece;
and 5, starting the testing machine and loading.
Compared with the prior art, the invention has the following advantages:
According to the loading device for the bonding sliding performance test, the test piece to be loaded is placed between the first support plate and the second support plate, the reinforcing steel bars at the upper end of the test piece extend into the central hole of the through ball hinge and penetrate out of the mounting through hole of the first support plate, the reinforcing steel bars at the lower end of the test piece extend into the mounting through hole of the second support plate, the ball hinge connecting rod is arranged in the mounting through hole of the third support plate, the mounting through holes of the first support plate, the second support plate and the third support plate are coaxially aligned, the reinforcing steel bars of the test piece to be loaded can be aligned with the clamping heads of the testing machine by adjusting the through ball hinge and the ball hinge connecting rod, bending moment generated by eccentricity can be released, loading accuracy can be improved, and test accuracy and reliability can be improved. Compared with the traditional loading device, the test loading device is more direct in the stress of the test piece, so that the loss of the load applied to the test piece by the test machine through the loading device is reduced, and the stress of the test piece is more direct.
Furthermore, the centering can be effectively adjusted through the limit bolt, and the generation of additional bending moment during loading due to the eccentric test piece is prevented.
Further, the strength of the mounting through hole can be enhanced by arranging the local reinforcing plate at the mounting through hole of the third supporting plate, the phenomenon that the third supporting plate deforms in loading to influence the centering of the reinforcing steel bars of the test piece and the clamping head of the testing machine is avoided, and the loading accuracy is further guaranteed.
Further, the same side of first backup pad, wear center spherical hinge and second backup pad all opens there is the opening, can put into loading device with the test piece more conveniently through the opening, and the installation of being convenient for can improve loading efficiency.
Further, the landing leg adopts the screw rod, all begins to have threaded connection hole in every backup pad, and the screw rod is connected with threaded connection hole through nut and gasket, and the installation of being convenient for also is convenient for adjust the distance between each backup pad according to actual need, can improve loading device's application scope.
Further, the first displacement meter is used for measuring the relative displacement between the reinforcing steel bar at the loading end and the concrete.
Further, the second displacement meter is used for measuring the relative displacement between the free end reinforcing steel bars and the concrete.
The loading method can be used for loading the adhesive slip performance test, is convenient to operate and high in loading efficiency, and can ensure that the test piece steel bars and the clamping head of the testing machine have higher centering property, can release bending moment generated by eccentricity and has higher loading accuracy.
Drawings
FIG. 1 is a schematic view of the overall structure of a loading device for adhesive slip performance test according to the present invention;
FIG. 2 is a schematic top view of the structure of FIG. 1;
Fig. 3 is a schematic top view of the first support plate of fig. 1;
FIG. 4 is a schematic elevational view of the center-through ball joint of FIG. 1;
FIG. 5 is a schematic top view of the structure of FIG. 4;
fig. 6 is a schematic top view of the second support plate of fig. 1;
FIG. 7 is a schematic elevational view of the partial reinforcement panel of FIG. 1;
FIG. 8 is a schematic top view of the structure of FIG. 7;
fig. 9 is a schematic top view of the third support plate of fig. 1;
FIG. 10 is a schematic elevational view of the ball and socket joint of FIG. 1;
FIG. 11 is a schematic top view of the structure of FIG. 10;
FIG. 12 is a schematic view of an exploded construction of the connection of the ball and socket tie rod, the partial reinforcing plate and the third support plate;
In fig. 1 to 12, 1-reinforcing steel bar, 2-screw, 3-nut, 4-first support plate, 5-connecting bolt, 6-through spherical hinge, 7-limit bolt, 8-first displacement meter, 9-concrete test block, 10-second support plate, 11-second displacement meter, 12-local reinforcing plate, 13-third support plate and 14-spherical hinge connecting rod.
Detailed Description
The invention will be described in further detail with reference to the drawings and the specific examples.
Referring to fig. 1 to 12, a loading device for adhesive slip performance test of the present invention includes: loading frame, test piece and testing machine.
The loading frame comprises a supporting leg, a first supporting plate 4, a second supporting plate 10 and a third supporting plate 13, wherein the first supporting plate 4, the second supporting plate 10 and the third supporting plate 13 are sequentially and fixedly arranged on the supporting leg; the landing leg is 4 screw rods 2, and three backup pad is the rectangle steel sheet, has offered coaxial screw thread mounting hole near the four corners of three backup pad respectively, and screw rod 2 installs respectively in the screw thread mounting hole and carries out fixed connection through nut 3 and gasket, adopts screw rod 2 as the landing leg be convenient for according to the interval between the length adjustment first backup pad 4 of test piece and the second backup pad 10, the operation of being convenient for helps improving loading device's application scope. The first support plate 4, the second support plate 10 and the third support plate 13 are provided with coaxial mounting through holes; a center-penetrating spherical hinge 6 is fixedly arranged at the mounting through hole of the first supporting plate 4, the center hole of the center-penetrating spherical hinge 6 is coaxial with the mounting through hole on the first supporting plate 4, the center-penetrating spherical hinge 6 is positioned between the first supporting plate 4 and the second supporting plate 10, and bending moment generated due to eccentricity is released through the center-penetrating spherical hinge 6; the upper part of the through spherical hinge 6 is connected with the first supporting plate 4 through a connecting bolt 5, the lower part of the through spherical hinge passes through the steel bar 1, the steel bar 1 directly passes through the upper part of the through spherical hinge 6, and the steel bar 1 passes through the center of the convex and concave surfaces; when the steel bar 1 is connected with the upper clamping head of the testing machine, and the connecting line is not parallel to the axis of the steel bar 1, the steel bar 1 of the test piece can be adjusted to slightly rotate through the through ball hinge 6, the through ball hinge 6 can play a role in adjusting and centering the test piece, bending moment generated by eccentricity can be released, and loading precision is improved. The steel bar 1 at the upper end of the test piece can pass through the center hole of the through ball hinge 6 to enter the mounting through hole on the first support plate 4, the steel bar 1 at the lower end of the test piece can enter the mounting through hole of the second support plate 10, the bottom of the concrete test block 9 of the test piece is placed on the second support plate 10, and the second support plate 10 is placed on the concrete bonding test piece of the steel bar 1; the lower extreme of punching ball pivot 6 is provided with stop bolt 7, and stop bolt 7 is used for carrying out circumference spacing to concrete test block 9, prevents that concrete test block 9 from taking place circumference in the loading process from moving. The homonymy of first backup pad 4 and second backup pad 10 is provided with the opening respectively, and the opening is respectively through the installation through-hole on first backup pad 4 and the second backup pad 10, and the reinforcing bar 1 of test piece can be followed the opening and directly put into, the placing of the test piece of being convenient for. A first bracket is arranged at the contact position of the lower end of the center hole of the center-penetrating spherical hinge 6 and the test piece, and a first displacement meter 8 is arranged on the first bracket. A second bracket is installed at the installation through hole of the second support plate 10, and a second displacement meter 11 is installed on the second bracket. And a displacement meter is arranged at the mounting through holes of the center-penetrating spherical hinge 6 and the second supporting plate 10, so that the relative sliding of the free end and the loading end can be measured, the mounting is convenient, and the test piece is convenient to operate.
The ball pivot connecting rod 14 with the ball pivot is arranged in the installation through hole of the third supporting plate 13, the ball pivot connecting rod 14 can be connected with the chuck of the testing machine, micro rotation can be generated between the ball pivot connecting rod 14 and the installation through hole of the third supporting plate 13, if the ball pivot connecting rod 14 is not parallel to the chuck of the testing machine, the bending moment generated on the loading machine due to non-centering can be released by micro rotation between the ball pivot and the installation through hole of the ball pivot connecting rod 14 and the installation through hole of the third supporting plate 13, and the ball pivot connecting rod 14 can play a role in adjusting the centering releasing bending moment. The installation through hole department of third backup pad 13 is provided with local reinforcing plate 12, and local reinforcing plate 12 can strengthen the intensity of the installation through hole department of third backup pad 13, avoids third backup pad 13 to take place to warp in the loading process.
The test piece includes reinforcing bar 1 and concrete test block 9, and reinforcing bar 1 buries in concrete test block 9, and concrete test block 9 is all stretched out at reinforcing bar 1's both ends, and the centre bore of penetrating spherical hinge 6 and the installation through-hole of first backup pad 4 are worn out to reinforcing bar 1's upper portion chuck fixed connection with the test machine, and reinforcing bar 1's lower extreme stretches into in the installation through-hole of second backup pad 10, the lower part chuck of test machine and the spherical hinge connecting rod 14 fixed connection of third backup pad 13.
The loading method for the adhesive slip performance test is based on the loading device and comprises the following specific steps of:
Step 1, effectively connecting three support plates with a screw rod 2 through a nut 3 and a gasket to form a loading frame, and connecting the upper part of a through spherical hinge 6 with a first support plate 4 through a connecting bolt 5;
Step 2, placing a test piece to be loaded between the first support plate 4 and the second support plate 10, wherein the steel bar 1 at the upper end of the test piece stretches into the central hole of the through ball hinge 6 and penetrates out of the mounting through hole of the first support plate 4 to be connected with the upper chuck of the testing machine, and the steel bar 1 at the lower end of the test piece stretches into the mounting hole of the second support plate 10;
step 3, connecting a spherical hinge connecting rod 14 arranged on a third supporting plate 13 with a lower chuck of the testing machine;
Step 4, adjusting the center-penetrating spherical hinge 6 and the spherical hinge connecting rod 14 to enable the steel bar 1 of the test piece to be centered with the upper clamping head and the lower clamping head of the testing machine, so that eccentricity is avoided;
Step 5, a first displacement meter 8 is arranged between the center-through spherical hinge 6 and the concrete test block 9 of the test piece, a second displacement meter 11 is arranged between the second support plate 10 and the concrete test block 9 of the test piece, and the corresponding positions are adjusted until the requirements of test measurement are met;
and 6, starting the testing machine to load, namely zeroing the load of the testing machine and eliminating the weight influence of the loading device, the test piece, the displacement meter and other devices.
And 7, carrying out a bonding slip test according to the standard requirement in the loading process.
Claims (2)
1. A loading device for a bond slip performance test, comprising: loading a frame;
The loading frame comprises a supporting leg, a first supporting plate (4), a second supporting plate (10) and a third supporting plate (13); the first supporting plate (4), the second supporting plate (10) and the third supporting plate (13) are sequentially and fixedly arranged on the supporting leg; coaxial mounting through holes are formed in the first support plate (4), the second support plate (10) and the third support plate (13); a center hole of the center-penetrating spherical hinge (6) is coaxial with an installation through hole on the first supporting plate (4), the center-penetrating spherical hinge (6) is positioned between the first supporting plate (4) and the second supporting plate (10), a reinforcing steel bar (1) at the upper end of a test piece can penetrate through the center hole of the center-penetrating spherical hinge (6) to enter the installation through hole on the first supporting plate (4), and the reinforcing steel bar (1) at the lower end of the test piece can enter the installation through hole of the second supporting plate (10); a spherical hinge connecting rod (14) with a spherical hinge is arranged in the installation through hole of the third supporting plate (13), and the spherical hinge connecting rod (14) can be connected with a chuck of the testing machine;
The lower end of the center-penetrating spherical hinge (6) is provided with a limit bolt (7), and the limit bolt (7) is used for circumferentially limiting the concrete test block (9); a local reinforcing plate (12) is arranged at the mounting through hole of the third supporting plate (13); the same sides of the first support plate (4) and the second support plate (10) are respectively provided with a notch, and the notches pass through mounting through holes on the first support plate (4) and the second support plate (10) respectively;
The support leg comprises 4 screws (2); the 4 screws (2) are fixedly connected with the first supporting plate (4), the second supporting plate (10) and the third supporting plate (13) through nuts (3) and gaskets respectively; the lower end of the center hole of the center-penetrating spherical hinge (6) is provided with a first bracket, and the first bracket is provided with a first displacement meter (8);
a second bracket is arranged at the mounting through hole of the second supporting plate (10), and a second displacement meter (11) is arranged on the second bracket;
The device also comprises a test piece and a testing machine; the test piece comprises a reinforcing steel bar (1) and a concrete test block (9), wherein the reinforcing steel bar (1) is buried in the concrete test block (9), the two ends of the reinforcing steel bar (1) are respectively extended out of the concrete test block (9), the upper end of the reinforcing steel bar (1) is penetrated out of a central hole of a penetrating spherical hinge (6) and an installation through hole of a first supporting plate (4) to be fixedly connected with an upper clamping head of a testing machine, the lower end of the reinforcing steel bar (1) is extended into an installation through hole of a second supporting plate (10), and the lower clamping head of the testing machine is fixedly connected with a spherical hinge connecting rod (14) of a third supporting plate (13).
2. A loading method for binding slip performance test, characterized in that based on the loading device of claim 1, the test piece to be loaded comprises a steel bar (1) and a concrete test block (9), the steel bar (1) is embedded in the concrete test block (9), both ends of the steel bar (1) extend out of the concrete test block (9), and the method specifically comprises the following steps:
Step 1, placing a test piece to be loaded between a first support plate (4) and a second support plate (10), wherein a steel bar (1) at the upper end of the test piece stretches into a central hole of a through ball hinge (6) and penetrates out of an installation through hole of the first support plate (4) to be connected with an upper chuck of a testing machine, and the steel bar (1) at the lower end of the test piece stretches into an installation hole of the second support plate (10);
Step 2, connecting a spherical hinge connecting rod (14) arranged on a third supporting plate (13) with a lower chuck of the testing machine;
step 3, adjusting the center-penetrating spherical hinge (6) and the spherical hinge connecting rod (14) to enable the steel bar (1) of the test piece to be centered with the upper clamping head and the lower clamping head of the testing machine;
Step 4, a first displacement meter (8) is arranged between the center-penetrating spherical hinge (6) and the concrete of the test piece, and a second displacement meter (11) is arranged between the second supporting plate (10) and the concrete of the test piece;
and 5, starting the testing machine and loading.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810574150.1A CN108801906B (en) | 2018-06-05 | 2018-06-05 | Loading device and method for bonding slip performance test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810574150.1A CN108801906B (en) | 2018-06-05 | 2018-06-05 | Loading device and method for bonding slip performance test |
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| CN108801906A CN108801906A (en) | 2018-11-13 |
| CN108801906B true CN108801906B (en) | 2024-07-02 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110132840B (en) * | 2019-05-08 | 2021-10-22 | 浙江数智交院科技股份有限公司 | Profiled steel sheet and concrete horizontal binding power measuring device based on self-balancing principle |
| CN111751275A (en) * | 2020-07-29 | 2020-10-09 | 宁波大学 | Sliding push-out test device and method for bonding performance of profile steel and confined concrete |
| CN111751276A (en) * | 2020-07-29 | 2020-10-09 | 宁波大学 | Loading device and method for bonding performance test of reinforcement and confined concrete |
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| CN203908928U (en) * | 2014-07-01 | 2014-10-29 | 三峡大学 | Reinforced concrete bond stress and slippage measuring device |
| CN105466779A (en) * | 2016-01-06 | 2016-04-06 | 上海理工大学 | Pull-out testing and measuring device suitable for universal machine |
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| CN2066136U (en) * | 1989-08-01 | 1990-11-21 | 大连理工大学 | Rigidity supplementary device for fragile material direct tensile test |
| RU2244789C1 (en) * | 2003-07-31 | 2005-01-20 | Научно-исследовательское и экспериментально-проектное республиканское унитарное предприятие "Институт БелНИИС" Министерства архитектуры и строительства Республики Беларусь | Composite reinforced concrete column, butt-joint for columns and method of butt-joint forming |
| JP4953126B2 (en) * | 2007-04-27 | 2012-06-13 | 国立大学法人金沢大学 | Torsion test equipment |
| CN101419143A (en) * | 2008-11-21 | 2009-04-29 | 同济大学 | Bidirectional composite force loading test device for masonry test piece |
| CN102213660B (en) * | 2010-04-12 | 2013-05-01 | 青岛理工大学 | Concrete constant-tension holding and composite corrosion test device |
| CN203786016U (en) * | 2014-03-11 | 2014-08-20 | 湖北工业大学 | Reinforcing steel bar and concrete bonding strength test auxiliary device |
| CN107238568A (en) * | 2017-03-31 | 2017-10-10 | 浙江大学 | Method of testing and loading device based on corrosion and the armored concrete bond-slip properties of fatigue load coupling influence |
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| CN203908928U (en) * | 2014-07-01 | 2014-10-29 | 三峡大学 | Reinforced concrete bond stress and slippage measuring device |
| CN105466779A (en) * | 2016-01-06 | 2016-04-06 | 上海理工大学 | Pull-out testing and measuring device suitable for universal machine |
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