CN203908928U - Reinforced concrete bond stress and slippage measuring device - Google Patents
Reinforced concrete bond stress and slippage measuring device Download PDFInfo
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- CN203908928U CN203908928U CN201420359318.4U CN201420359318U CN203908928U CN 203908928 U CN203908928 U CN 203908928U CN 201420359318 U CN201420359318 U CN 201420359318U CN 203908928 U CN203908928 U CN 203908928U
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- reinforced concrete
- reinforcing bar
- bond stress
- measurement mechanism
- positioning screw
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Abstract
The utility model discloses a reinforced concrete bond stress and slippage measuring device. The device comprises a drawing bracket, wherein a reinforced concrete drawing sample is arranged in the drawing bracket, a plurality of strain gauges are adhered to a steel bar internal groove in the reinforced concrete drawing sample, a second fixing device is arranged on a loading end of a steel bar, the second fixing device is fixedly connected with a second screw, the second screw is fixedly connected with a second right-angle joint, a second positioning screw is arranged on the surface of the concrete test block, the second positioning screw is connected with a second displacement sensor, a measuring rod of the second displacement sensor is in contact with a second right-angle joint; the free end of the steel bar is correspondingly provided with a first displacement sensor. Since screws arranged on the concrete outer wall and the steel bar end are matched with the displacement sensors, the slippage and the bond stress of the free end and the loading end of the steel bar can be accurately measured, the operation is convenient, the labor is saved, the test accuracy and the working efficiency are improved, and the defects in the prior art are overcome.
Description
Technical field
The utility model relates to the test field of civil engineering work, particularly a kind of test unit of measuring bond stress and slippage between concrete and rebar.
Background technology
Bond-slip properties is one of most important basic problem in reinforced concrete structure theory.At present, the adhesion test method of employing has pull-out test, beam test and axis pulling experiment.Test specimen making and the test unit of pull-out test are fairly simple, and test findings is convenient to analyze.Therefore for a long time with it as adhesive property between reinforced concrete is carried out to benchmark relatively.For realizing, bond-slip τ-s constitutive relation is described more accurately, reinforcing bar fluting, paster and the methods by slippage distribution in loading end, free end reckoning of adopting more, explore bond-anchorage τ-s relation along the long Changing Pattern of anchor, thereby shown that a function of position ψ (x) reflects this variation.But also there is in test the problems such as measurement result precision is inadequate, and discreteness is larger.Main manifestations is that the measurement of free end, loading end slippage is more difficult; The problems such as reinforcing bar fluting, mount technology more complicated and foil gauge are too sparse.So study and a kind ofly can accurately measure the device of bond stress and slippage between reinforcing bar and concrete and there is very much realistic meaning.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of reinforced concrete bond stress and slippage measurement mechanism, can Measurement accuracy free end, loading end slippage and bond stress, and this device is easy to operate, measure and save manpower, improve test accuracy and work efficiency.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of reinforced concrete bond stress and slippage measurement mechanism, comprise drawing frame, reinforced concrete drawing test specimen is placed in drawing frame, in the adhesive section inside groove of the reinforcing bar of reinforced concrete drawing test specimen, be pasted with multi-disc foil gauge along axis direction, be provided with the second stationary installation at the loading end of reinforcing bar, the second stationary installation is fixedly connected with the second screw rod, the second screw rod is fixedly connected with the second right angle code, be provided with the second positioning screw on concrete test block surface, the second positioning screw is connected with second displacement sensor, the sounding rod of second displacement sensor contacts with the second right angle code,
Be provided with the first stationary installation at the free end of reinforcing bar, the first stationary installation is fixedly connected with the first screw rod, the first screw rod is fixedly connected with the first displacement transducer, be provided with the first positioning screw on concrete test block surface, the first positioning screw is fixedly connected with the first right angle code, and the sounding rod of the first displacement transducer contacts with the first right angle code.
The first positioning screw and the second positioning screw are positioned at the position near adhesive section termination.
The connected mode of the first stationary installation and the second stationary installation and reinforcing bar is detachable adjustable connected mode.
On reinforcing bar outside adhesive section two ends, be also provided with sleeve pipe, sleeve pipe is coated in concrete.
Foil gauge, the first displacement transducer and second displacement sensor are connected with strain acquirement instrument by circuit, and strain acquirement instrument is connected with computer.
The upper end of drawing frame is connected with the holder of universal testing machine, and the loading end of reinforced concrete drawing test specimen is connected with the draw-off gear of universal testing machine through drawing frame lower shoe.
Described drawing frame lower shoe is provided with for the hole that in reinforced concrete drawing test specimen, reinforcing bar passes, and between reinforced concrete drawing test specimen and drawing frame lower shoe, is provided with billet, and billet is provided with the hole of passing for loading end.
Described multi-disc foil gauge head and the tail order is arranged.
A kind of reinforced concrete bond stress and slippage measurement mechanism that the utility model provides, by the screw rod in outer walls of concrete and steel bar end setting, coordinate displacement transducer, thereby can accurately measure slippage and the bond stress of reinforcing bar free end and loading end, and easy to operate, save manpower, improved test accuracy and work efficiency, overcome defect of the prior art.
Brief description of the drawings
Below in conjunction with accompanying drawing and example, the utility model is described in further detail:
Fig. 1 is main TV structure schematic diagram of the present utility model.
Fig. 2 is right TV structure schematic diagram of the present utility model.
Fig. 3 is the local enlarged diagram of reinforced concrete drawing test specimen coupling part in Fig. 1.
Fig. 4 is the local enlarged diagram of reinforced concrete drawing test specimen coupling part in Fig. 2.
In figure: drawing frame lower shoe 1, billet 2, the first stationary installation 3, the second stationary installation 3', the first positioning screw 4, the second positioning screw 4', the first right angle code 5, the second right angle code 5', the first screw rod 6, the second screw rod 6', the first displacement transducer 7, second displacement sensor 7', foil gauge 8, strain acquirement instrument 9, computer 10, sleeve pipe 11, adhesive section 12, loading end 13, free end 14, reinforced concrete drawing test specimen 15, drawing frame 16, holder 17, draw-off gear 18, circuit 19.
Embodiment
In Fig. 1～4, a kind of reinforced concrete bond stress and slippage measurement mechanism, comprise drawing frame 16, the upper end of drawing frame 16 is connected with the holder of universal testing machine, and the loading end 13 of reinforced concrete drawing test specimen 15 is connected with the draw-off gear 18 of universal testing machine through drawing frame lower shoe 1.
Reinforced concrete drawing test specimen 15 is placed in drawing frame 16, the drawing frame lower shoe 1 of preferred drawing frame 16 is provided with the hole of passing for the reinforcing bar in reinforced concrete drawing test specimen 15, between reinforced concrete drawing test specimen 15 and drawing frame lower shoe 1, be provided with billet 2, billet 2 is provided with the hole of passing for loading end 13.The center drilling of billet 2 avoids the hole of drawing frame lower shoe 1 to exert an influence to the destruction form of reinforced concrete drawing test specimen 15.
Along the cutting of axis direction warp, groove milling processing, in the adhesive section inside groove of reinforced concrete drawing test specimen reinforcing bar, post multi-disc foil gauge 8 at the reinforcing bar of reinforced concrete drawing test specimen 15, preferred, described multi-disc foil gauge 8 head and the tail orders are arranged.Preferably, the cutting of reinforcing bar warp is cut to two halves along axis, and mills out along axis the groove that xsect is rectangle on the two halves reinforcing bar cutting.Foil gauge 8 is placed in the groove of reinforcing bar adhesive section institute milling, and after foil gauge posts, by the two halves reinforcing bar epoxy resin closure of line cutting, structure thus, obtains the corresponding reinforcing bar strain parameter of more accurate bond stress.
Be provided with the second stationary installation 3' at the loading end 13 of reinforcing bar, the second stationary installation 3' is fixedly connected with the second screw rod 6', the second screw rod 6' is fixedly connected with the second right angle code 5', be provided with the second positioning screw 4' on concrete test block surface, the second positioning screw 4' is connected with second displacement sensor 7', and the sounding rod of second displacement sensor 7' contacts with the second right angle code 5';
Be provided with the first stationary installation 3 at the free end 14 of reinforcing bar, the first stationary installation 3 is fixedly connected with the first screw rod 6, the first screw rod 6 is fixedly connected with the first displacement transducer 7, be provided with the first positioning screw 4 on concrete test block surface, the first positioning screw 4 is fixedly connected with the first right angle code 5, and the sounding rod of the first displacement transducer 7 contacts with the first right angle code 5.Taking loading end 13 as example, when loading end 13 produces displacement, the second screw rod 6' and have between the second positioning screw 4' and produce relative displacement, the sounding rod of second displacement sensor 7' produces telescopic displacement, and second displacement sensor 7' is sent to strain acquirement instrument 9 by displacement data.
By above-mentioned structure, accurately measure the relative shuffle data store of loading end 13 with the free end 14 at adhesive section 12 two ends.
Preferred as in Fig. 3, the first positioning screw 4 and the second positioning screw 4' are positioned at the position near adhesive section 12 terminations.Structure thus, further improves the measuring accuracy of loading end 13 and free end 14.
Further preferred, on the reinforcing bar outside two ends, be also provided with sleeve pipe 11, sleeve pipe 11 is coated in concrete.Structure thus, makes concrete have enough width for the first positioning screw 4 and the second positioning screw 4' are installed, thereby makes the axis of the first positioning screw 4 and the second positioning screw 4' just in time be positioned at the end face of adhesive section 12.
The connected mode of the first stationary installation 3 and the second stationary installation 3' and reinforcing bar is detachable adjustable connected mode.Structure thus, is convenient to the elasticity that mounting or dismounting are connected with reinforcing bar with adjusting.
Foil gauge 8, the first displacement transducer 7 and second displacement sensor 7' are connected with strain acquirement instrument 9 by circuit 19, and strain acquirement instrument 9 is connected with computer 10.By strain acquirement instrument 9, the data that collect are sent in computer 10 and analyzed.
Test procedure:
Step 1: deformed bar is cut into two halves by the method for line cutting along vertical rib, on lathe, two halves reinforcing bar is carried out to groove milling;
Step 2: by multi-disc foil gauge 8, stick on successively in the groove of reinforcing bar adhesive section institute milling, and after lead line 19, two halves reinforcing bar is sticked together to ensure the integrality of reinforcing bar with epoxy resin, put sleeve pipe 11 in non-adhesive section;
Step 3: the reinforcing bar that step 2 is completed is put into mould is fixed the first positioning screw 4 and the second positioning screw 4 ＇ in mould, within 28 days, forms reinforced concrete drawing test specimen 15 to removing mould standard maintenance after casting concrete moulding in mould;
Step 4: reinforced concrete drawing test specimen 15 is placed in drawing frame 16, at loading end 13
The second stationary installation 3' is installed at place, after connecting the second stationary installation 3' and the second screw rod 6', the second right angle code 5' is fixedly connected on the second screw rod 6 ', second displacement sensor 7' is connected with second positioning screw 4 ' on concrete test block surface, ensures that the sounding rod of second displacement sensor 7' contacts with the second right angle code 5'.Same method is installed the first stationary installation 3 at free end 14 places, after connecting the first stationary installation 3 and the first screw rod 6, the first straight displacement transducer 7 is fixedly connected on the first screw rod 6, the second right angle code 5 is connected with first positioning screw 4 on concrete test block surface, ensures that the sounding rod of the first displacement transducer 7 contacts with the second right angle code 5;
Step 5: the circuit 19 of drawing with second displacement sensor 7 ' from foil gauge 8, the first displacement transducer 7 is connected with strain acquirement instrument 9, strain acquirement instrument 9 is connected on computer 10;
Step 6: open universal testing machine, draw-off gear 18 is firmly clipped in to reinforced concrete drawing test specimen loading end 13 places, prepare to start test;
Step 7: control universal testing machine draw-off gear 18 and load, under every grade of load, control the strain and displacement data that computer 10 gathers foil gauge 8, the first displacement transducer and second displacement sensor and be transferred to by circuit 19 strain acquirement instrument 9, until the solidifying native drawing test specimen of reinforcing bar destroys.
Claims (9)
1. a reinforced concrete bond stress and slippage measurement mechanism, comprise drawing frame (16), reinforced concrete drawing test specimen (15) is placed in drawing frame (16), in adhesive section (12) inside groove of the reinforcing bar of reinforced concrete drawing test specimen (15), be pasted with multi-disc foil gauge (8) along axis direction, it is characterized in that: (3') the loading end (13) at reinforcing bar is provided with the second stationary installation, (6') (3') the second stationary installation be fixedly connected with the second screw rod, (5') (6') the second screw rod be fixedly connected with the second right angle code, be provided with the second positioning screw (4') on concrete test block surface, (7') (4') the second positioning screw be connected with second displacement sensor, (5') second displacement sensor sounding rod (7') contacts with the second right angle code,
Free end (14) at reinforcing bar is provided with the first stationary installation (3), the first stationary installation (3) is fixedly connected with the first screw rod (6), the first screw rod (6) is fixedly connected with the first displacement transducer (7), be provided with the first positioning screw (4) on concrete test block surface, the first positioning screw (4) is fixedly connected with the first right angle code (5), and the sounding rod of the first displacement transducer (7) contacts with the first right angle code (5).
2. a kind of reinforced concrete bond stress according to claim 1 and slippage measurement mechanism, is characterized in that: (4') the first positioning screw (4) and the second positioning screw are positioned at the position near adhesive section (12) termination.
3. a kind of reinforced concrete bond stress according to claim 1 and slippage measurement mechanism, is characterized in that: (3') the first stationary installation (3) and the second stationary installation are detachable adjustable connected mode with the connected mode of reinforcing bar.
4. a kind of reinforced concrete bond stress according to claim 1 and slippage measurement mechanism, is characterized in that: on the reinforcing bar outside adhesive section (12) two ends, be also provided with sleeve pipe (11), sleeve pipe (11) is coated in concrete.
5. a kind of reinforced concrete bond stress according to claim 1 and slippage measurement mechanism, it is characterized in that: (7') foil gauge (8), the first displacement transducer (7) and second displacement sensor are connected with strain acquirement instrument (9) by circuit (19), strain acquirement instrument (9) is connected with computer (10).
6. a kind of reinforced concrete bond stress according to claim 1 and slippage measurement mechanism, it is characterized in that: the upper end of drawing frame (16) is connected with the holder of universal testing machine, the loading end (13) of reinforced concrete drawing test specimen (15) is connected with the draw-off gear (18) of universal testing machine through drawing frame lower shoe (1).
7. a kind of reinforced concrete bond stress according to claim 6 and slippage measurement mechanism, it is characterized in that: described drawing frame lower shoe (1) is provided with the hole of passing for the reinforcing bar in reinforced concrete drawing test specimen (15), between reinforced concrete drawing test specimen (15) and drawing frame lower shoe (1), be provided with billet (2), billet (2) is provided with the hole of passing for loading end (13).
8. a kind of reinforced concrete bond stress according to claim 1 and slippage measurement mechanism, is characterized in that: described multi-disc foil gauge (8) head and the tail order is arranged.
9. a kind of reinforced concrete bond stress according to claim 1 and slippage measurement mechanism, it is characterized in that: reinforcing bar is cut to two halves along axis, and milling out along axis the groove that xsect is rectangle on the two halves reinforcing bar cutting, foil gauge (8) is fixedly mounted in groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420359318.4U CN203908928U (en) | 2014-07-01 | 2014-07-01 | Reinforced concrete bond stress and slippage measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420359318.4U CN203908928U (en) | 2014-07-01 | 2014-07-01 | Reinforced concrete bond stress and slippage measuring device |
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| CN203908928U true CN203908928U (en) | 2014-10-29 |
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| CN201420359318.4U Expired - Fee Related CN203908928U (en) | 2014-07-01 | 2014-07-01 | Reinforced concrete bond stress and slippage measuring device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122201A (en) * | 2014-07-01 | 2014-10-29 | 三峡大学 | Device for measuring bond stress and slippage of reinforced concrete |
| CN105021522A (en) * | 2015-07-01 | 2015-11-04 | 三峡大学 | Bond-slip property detection device, reinforcing bar slotting and strain gauge protection method |
| CN106352808A (en) * | 2016-09-26 | 2017-01-25 | 长安大学 | Device for measuring deformation of cement-based composite material sample in laboratory |
| CN108801906A (en) * | 2018-06-05 | 2018-11-13 | 西安建筑科技大学 | A kind of loading device and method for bond-slip properties experiment |
-
2014
- 2014-07-01 CN CN201420359318.4U patent/CN203908928U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122201A (en) * | 2014-07-01 | 2014-10-29 | 三峡大学 | Device for measuring bond stress and slippage of reinforced concrete |
| CN105021522A (en) * | 2015-07-01 | 2015-11-04 | 三峡大学 | Bond-slip property detection device, reinforcing bar slotting and strain gauge protection method |
| CN106352808A (en) * | 2016-09-26 | 2017-01-25 | 长安大学 | Device for measuring deformation of cement-based composite material sample in laboratory |
| CN106352808B (en) * | 2016-09-26 | 2019-09-24 | 长安大学 | A kind of device that laboratory is deformed with measurement cement-base composite material test specimen |
| CN108801906A (en) * | 2018-06-05 | 2018-11-13 | 西安建筑科技大学 | A kind of loading device and method for bond-slip properties experiment |
| CN108801906B (en) * | 2018-06-05 | 2024-07-02 | 西安建筑科技大学 | Loading device and method for bonding slip performance test |
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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: 20141029 Termination date: 20170701 |
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| CF01 | Termination of patent right due to non-payment of annual fee |