CN209802952U - Reinforcing bar-concrete bonding property testing arrangement - Google Patents
Reinforcing bar-concrete bonding property testing arrangement Download PDFInfo
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- CN209802952U CN209802952U CN201920429796.0U CN201920429796U CN209802952U CN 209802952 U CN209802952 U CN 209802952U CN 201920429796 U CN201920429796 U CN 201920429796U CN 209802952 U CN209802952 U CN 209802952U
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- 238000012360 testing method Methods 0.000 title claims abstract description 69
- 239000004567 concrete Substances 0.000 title claims abstract description 66
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 85
- 239000010959 steel Substances 0.000 claims abstract description 85
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 3
- 238000004873 anchoring Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model provides a reinforcing steel bar-concrete bonding performance testing device, which comprises a beam test piece, a distribution beam and an upper connecting piece, wherein the beam test piece comprises a left half beam concrete and a right half beam concrete which are connected by a through long reinforcing steel bar, and two opposite sides of the left half beam concrete and the right half beam concrete are respectively provided with an L-shaped groove; steel hinges are clamped and placed in grooves formed by the two L-shaped grooves, steel hinge rotating shafts are arranged in the middle of the steel hinges, and the distances from the steel hinge rotating shafts to the left half beam concrete edge and the right half beam concrete edge are equal; a distribution beam is arranged above the beam test piece; and spherical hinge supports are respectively arranged below the left half beam concrete and the right half beam concrete. The utility model provides a draw the inconsistent problem of reinforcing bar, concrete stress state and true condition among the adhesion test, the utility model discloses the arm of force is clear and definite among the loading process, can test the bonding property based on roof beam's component test reinforcing bar-concrete.
Description
Technical Field
the utility model belongs to the technical field of the material performance test, concretely relates to reinforcing bar-concrete bonding property testing arrangement is applicable to reinforcing bar-concrete beam's test, and bonding strength between reinforcing bar and concrete is surveyed.
background
the bond slip property of the steel bar-concrete is the basic mechanical property of the concrete. The research on the bonding slippage problem of the steel bar-concrete not only has great significance in theory, but also has great significance in engineering practice, such as the anchoring length, the lap joint length and the like of the steel bar in the concrete.
At present, the bond property test of the steel bar and the concrete is mainly carried out by a drawing test mode. The test method and the test piece are simpler in form, but by adopting the method, the stress states of the concrete and the reinforcing steel bar in the test are different. The beam-type test completely simulates the anchoring state of the reinforcing steel bar in the curved shear area of the beam, conforms to the actual stress state, and can better reflect the bonding and sliding performance of the reinforcing steel bar in the actual concrete structure. Therefore, a testing device for testing the bonding performance of the steel bars and the concrete in the beam member is needed.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a simple structure, equipment convenience, do benefit to experimental test device who surveys for realize the bonding slippage performance between test reinforcing bar-concrete.
The technical scheme of the utility model as follows:
A reinforcing steel bar-concrete bonding performance testing device comprises a beam test piece, a distribution beam, a spherical hinge support and an upper connecting piece; the beam test piece comprises a left half beam concrete and a right half beam concrete which are connected by a through long steel bar, and two opposite sides of the left half beam concrete and the right half beam concrete are respectively provided with an L-shaped groove; steel hinges (the steel hinges are matched with the grooves, and the sizes of the steel hinges and the grooves are matched) are clamped in the grooves formed by the two L-shaped grooves, steel hinge rotating shafts are arranged in the middle of the steel hinges, the distances from the steel hinge rotating shafts to the concrete edges of the left half beam and the right half beam are equal, the force arm is clear, and therefore the steel bar tension can be accurately calculated according to the moment balance; a distribution beam is arranged above the beam test piece; and spherical hinge supports are respectively arranged below the left half beam concrete and the right half beam concrete.
The top structure of the spherical hinge support is a spherical hinge.
The distribution beam comprises a steel plate and a fixed hinged support, the upper end of the fixed hinged support is fixedly connected with the steel plate, and the lower end of the fixed hinged support is fixedly connected with the beam test piece and used for transmitting load and controlling a loading position; furthermore, the upper end of the fixed hinge support is connected with the steel plate through a bolt, and the lower end of the fixed hinge support is connected with the beam test piece through a screw; and a fixed hinge support rotating shaft is arranged in the middle of the fixed hinge support.
The steel hinge rotating shaft and the fixed hinge support rotating shaft are steel columns.
And the upper parts of the left and right half beam concretes are respectively fixedly connected with the lower end of the fixed hinged support.
The upper connecting piece is a steel bar, the steel bar is connected with the steel plate (the loading device and the testing device are connected through the steel bar), the loading device of the testing machine is guaranteed to have a certain space from the roof beam test piece, the test piece is easy to place, and the observation test is easy.
the utility model has the advantages that: the problem that the stress states of the steel bars and the concrete in the drawing bonding test are inconsistent with the real conditions is solved. The utility model discloses the size of steel hinge and recess just coincide, and the steel hinge directly is put on the recess, can not rock, need not to fix with the test piece, can play the rotation effect, adopts the ball pivot support, guarantees that roof beam's test piece warp, and the ball pivot support is all the time with test piece surface vertical, nimble convenient. The device adopts the beam test piece, can better simulate the bonding anchoring condition of the reinforcing steel bar at the beam end, has definite force arm, can calculate the tensile force of the reinforcing steel bar and test the bonding property of the reinforcing steel bar and the concrete. Along with the gradual increase of the loading, the concrete gradually deforms downwards, the steel hinges also deform, the distance between the steel plates above the steel hinges becomes smaller, and the distance between the steel plates below the steel hinges becomes larger; the fixed hinged support also rotates along with the fixed hinged support, and the steel plate below the fixed hinged support is always fixed with the surface of the test piece. In the process of applying load, the loading device and the testing device can not be separated. In addition, the device is easy to observe the test phenomenon, and the occurrence of the test phenomenon should not be influenced. Can be repeatedly used.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a side view of the fixed hinge support of the present invention;
FIG. 3 is a side view of the steel hinge of the present invention;
FIG. 4 is a schematic view of a beam test piece of the present invention;
FIG. 5 is a simplified force analysis;
In the figure: 1 beam test piece; 2, a support; 3, fixing a hinged support; 4, steel hinge; 5, a screw rod; 6, a steel bar; 7 steel plates; 8, bolts; 9 steel columns; 10 reinforcing bars.
Detailed Description
Example 1
As shown in fig. 1-4, a reinforcing steel bar-concrete bond property testing device comprises a beam test piece 1, a distribution beam and a steel bar 6, wherein the beam test piece 1 comprises a left half beam concrete and a right half beam concrete which are connected by a through long reinforcing steel bar 10, and two opposite sides of the left half beam concrete and the right half beam concrete are respectively provided with an L-shaped groove; steel hinges 4 are clamped and placed in grooves formed by the two L-shaped grooves (the steel hinges are matched with the grooves, and the sizes of the steel hinges and the grooves are matched), steel hinge rotating shafts are arranged in the middle of the steel hinges 4, the distances from the steel hinge rotating shafts to the left half beam concrete edge and the right half beam concrete edge are equal, the force arm is clear, and therefore the steel bar tension can be accurately calculated according to the moment balance; a distribution beam is arranged above the beam test piece 1; and spherical hinge supports 2 are respectively arranged below the left half beam concrete and the right half beam concrete.
The distribution beam comprises a steel plate 7 and a fixed hinged support 3, the upper end of the fixed hinged support 3 is connected with the steel plate 7 through a bolt 8, and the upper parts of the left half beam concrete and the right half beam concrete are respectively connected with the lower end of the fixed hinged support 3 through a screw rod 5; and a fixed hinged support rotating shaft is arranged in the middle of the fixed hinged support 3.
The steel hinge rotating shaft and the fixed hinge support rotating shaft are steel columns.
The steel bar 6 is connected with the center of the steel plate 7 (the loading device and the testing device are connected through the steel bar), so that the loading device of the testing machine is ensured to have a certain space from the beam test piece, the test piece is easy to place, and the observation test is carried out.
the beam test piece 1 is concrete with the size of 100 × 400mm, the smaller distance between the left half beam concrete and the right half beam concrete is 30mm, the distance between the two L-shaped grooves is 50mm, steel hinges 4 are placed, the length of each L-shaped groove is 100mm, the width of each L-shaped groove is 50mm, the thickness of each L-shaped groove is 10mm, the length of each steel hinge 4 is 100mm, the width of each L-shaped groove is 50mm, the thickness of each L-shaped groove is 50mm, the diameter of each steel bar 10 is 12 mm or 16mm, and the distance between each steel bar; the distance between the two spherical hinges is 300 mm; the length of the steel plate 7 is 150mm, the width is 130mm, the thickness is 20mm, the diameter of the holes formed in the left end part and the right end part of the steel plate 7 is 10mm, and the diameter of the hole formed in the center is 10 mm; the length of each fixed hinge support 3 is 130mm, the width of each fixed hinge support is 50mm, the height of each fixed hinge support is 100mm, the distance between the two fixed hinge supports 3 is 100mm, and the diameter of one end of each steel bar 6 is 10 mm; the surface of the screw rod 5 is provided with threads with the diameter of 10 mm.
a test method of a reinforcing steel bar-concrete bonding performance test device comprises the following steps:
firstly, prefabricating a beam test piece 1, placing the beam test piece 1 on a spherical hinge support 2, and fine-tuning and centering;
Secondly, after the distribution beam is assembled, the distribution beam is connected with the beam test piece 1, the upper end of the fixed hinge support 3 is fixed with the steel plate 7 through a bolt 8, and the lower end of the fixed hinge support is fixed with the beam test piece 1 through a screw 5;
Thirdly, the steel hinge 4 is placed in a groove formed by two L-shaped grooves of the beam test specimen 1, so that the force arm is definite, the moment balance can be achieved, and the steel bar tension can be obtained, as shown in fig. 5, the steel bar tension F is P (a)1-a2) V (2 × la), where P denotes the loading force, a1the distance from the steel hinge to the spherical hinge support, a2The distance from the steel hinge to the fixed hinge support and the distance from the ball hinge to the steel bar la are respectively1＝160mm,a2＝50mm，la＝45mm；
fourthly, the upper end of the steel bar 6 is connected with a loading device through a load sensor, the height of the loading device is adjusted until the lower end of the steel bar 6 penetrates through a middle round hole of the steel plate 7, and the loading device and the testing device are connected into a whole;
And fifthly, loading a loading device, wherein before the test piece is damaged, the steel bar 10 slightly slides, when any half beam cracks, the sliding of the steel bar 10 is suddenly increased, but the steel bar does not break away from the concrete, and finally, two half beams are damaged one after another and have larger cracks.
The loading device is an electro-hydraulic servo 500-ton testing machine.
The above is only an example of the present invention, and does not limit the protection scope of the present invention. All the technical schemes which are replaced by equivalent transformation or equivalent transformation fall within the protection scope of the utility model.
Claims (4)
1. The utility model provides a reinforcing bar-concrete bonding property testing arrangement which characterized in that: the device comprises a beam test piece (1), a distribution beam, a spherical hinge support (2) and an upper connecting piece; the beam test piece (1) comprises a left half beam concrete and a right half beam concrete which are connected by a through long steel bar (10), and two opposite sides of the left half beam concrete and the right half beam concrete are respectively provided with an L-shaped groove; steel hinges (4) are clamped and placed in grooves formed by the two L-shaped grooves, steel hinge rotating shafts are arranged in the middle of the steel hinges (4), and the distances from the steel hinge rotating shafts to the left half beam concrete edge and the right half beam concrete edge are equal; a distribution beam is arranged above the beam test piece (1); and spherical hinge supports (2) are respectively arranged below the left half beam concrete and the right half beam concrete.
2. The reinforcing bar-concrete bonding performance testing device of claim 1, wherein: the distribution beam comprises a steel plate (7) and a fixed hinged support (3), the upper end of the fixed hinged support (3) is fixedly connected with the steel plate (7), and the lower end of the fixed hinged support (3) is fixedly connected with the beam test piece (1).
3. the reinforcing bar-concrete bonding performance testing device of claim 2, wherein: and the upper parts of the left and right half beam concretes are respectively fixedly connected with the lower end of the fixed hinged support (3).
4. The reinforcing bar-concrete bonding performance testing device of claim 2, wherein: the upper connecting piece is a steel bar (6), and the steel bar (6) is connected with a steel plate (7).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920429796.0U CN209802952U (en) | 2019-04-01 | 2019-04-01 | Reinforcing bar-concrete bonding property testing arrangement |
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| CN201920429796.0U CN209802952U (en) | 2019-04-01 | 2019-04-01 | Reinforcing bar-concrete bonding property testing arrangement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109856046A (en) * | 2019-04-01 | 2019-06-07 | 大连理工大学 | A kind of steel-concrete adhesive property test device and test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109856046A (en) * | 2019-04-01 | 2019-06-07 | 大连理工大学 | A kind of steel-concrete adhesive property test device and test method |
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