CN102879282B - The test specimen of steel-concrete interface shear stress web member shear-carrying capacity test and method - Google Patents
The test specimen of steel-concrete interface shear stress web member shear-carrying capacity test and method Download PDFInfo
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- CN102879282B CN102879282B CN201210416210.XA CN201210416210A CN102879282B CN 102879282 B CN102879282 B CN 102879282B CN 201210416210 A CN201210416210 A CN 201210416210A CN 102879282 B CN102879282 B CN 102879282B
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- 238000012360 testing method Methods 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 41
- 239000010959 steel Substances 0.000 claims abstract description 41
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims description 40
- 238000010008 shearing Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 7
- 238000003466 welding Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000003351 stiffener Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention discloses test specimen and the method for the test of a kind of steel-concrete interface shear stress web member shear-carrying capacity.It comprises steel plate, concrete block, stirrup and shear connector, it is characterized in that: described shear connector is one, and concrete block is rectangular-shaped and its xsect is square, and stirrup is the xsect surrounded by reinforcing bar is foursquare rectangular parallelepiped; Stirrup is cast in concrete block, and the geometric center of stirrup overlaps with the geometric center of concrete block, and wherein two opposite side of the xsect of stirrup are parallel with wherein two opposite side of the xsect of concrete block; Concrete block is cast on steel plate, and the rod end of described shear connector is welded on steel plate, and described shear connector is perpendicular to steel plate and be positioned at the center at the interface of steel plate and concrete block.The present invention can correct and load eccentric impact, obtains accurate unitized construction shear connector shear-carrying capacity; And the cohesive force at steel-concrete interface can be measured.
Description
Technical field
The present invention relates to a kind of test test specimen for measuring shear connector shear-carrying capacity between steel and concrete interface and method thereof.
Background technology
General employing push out test at present carrys out the Shear transfer between tested steel and concrete, when adopting the shearing strength of push out test research shear connector, if ensure to release the stressed equal of all shear connectors in test specimen and synchronously load, test findings can reflect the stress performance of each shear connector accurately.But to load due to test and test specimen is originally experienced the impact of multiple enchancement factor, as the manufacturing deviation of test specimen, the compaction rate of shear connector surrounding concrete, the deviation of shear connector welding position, the difference of welding quality and loading are eccentric, make to be difficult to ensure that the load that each shear connector bears is completely equal.The simultaneously requirement of pressure testing machine and the size of huge release test specimen make push out test often be subject to the restriction of testing equipment, test site and funds, and adopt common release test specimen to be also difficult to measure the cohesive force between steel plate and concrete.
When releasing test specimen for testing shear connector corrosion to the affecting of shearing bearing capacity, due to concrete wood property, the situations such as current density, be difficult to ensure that the corrosion degree of each shear connector is identical, different corrosion degree causes discontinuity, the shear connector making corrosion degree large bears larger load and very fast destruction, have impact on ultimate bearing capacity, is difficult to the true bearing capacity judging corrosion shear connector accurately like this.And the total quality releasing test specimen is too large, makes its precision of weighing instruments meeting range more coarse, be difficult to adopt weight method to carry out corrosion mass loss mensuration.Therefore be difficult to accurately measure the impact of corrosion for the Shear transfer between steel and concrete.Still there is no special steel-concrete interface shear stress transmission testing device and method at present.
Summary of the invention
The object of this invention is to provide a kind of test test specimen for measuring shear connector shear-carrying capacity between steel and concrete interface and method thereof.
For achieving the above object, the present invention comprises steel plate, concrete block, stirrup and shear connector for the test specimen carrying out the test of steel-concrete interface shear stress web member shear-carrying capacity, wherein, described concrete block, steel plate and shear connector are respectively one, concrete block is rectangular-shaped and its xsect is square, and stirrup is the xsect surrounded by reinforcing bar is foursquare rectangular parallelepiped; Stirrup is cast in concrete block, and the geometric center of stirrup overlaps with the geometric center of concrete block, and wherein two opposite side of the xsect of stirrup are parallel with wherein two opposite side of the xsect of concrete block; Concrete block is cast on steel plate, and the rod end of described shear connector is welded on steel plate, and described shear connector is perpendicular to steel plate and be positioned at the center at the interface of steel plate and concrete block.
Use test specimen of the present invention carry out steel-concrete interface shear stress web member shear-carrying capacity test method as follows:
Wherein, test unit for carrying out the test of steel-concrete interface shear stress web member shear-carrying capacity comprises base, upper reaction plate, first pressure transducer, friction pair, lifting jack, second pressure transducer and lateral reaction plate, the workplace of described base is provided with for fixing by the groove of subjects, described groove is relative with friction pair, described upper reaction plate and base are fixedly connected and upper reaction plate is positioned at the top of the workplace of base, described first pressure transducer and friction pair are placed between described upper reaction plate and the workplace of base, described first pressure transducer between upper reaction plate and friction pair and described first pressure transducer respectively with upper reaction plate and friction pair close contact, described lateral reaction plate and base are fixedly connected, and the base of the second pressure transducer and the workplace of described lateral reaction plate are fixedly connected, the other end of the second pressure transducer and lifting jack close contact, described upper reaction plate also includes height adjustment bolt, and described height adjustment bolt runs through reaction plate and height adjustment bolt and upper reaction plate threaded engagement, described height adjustment bolt and described first pressure transducer close contact,
Described method of carrying out the test of steel-concrete interface shear stress web member shear-carrying capacity comprises the steps:
Described test specimen is fixed in the groove of described test unit by step a., and makes bottom surface and the groove close contact of the steel plate of test specimen, the end face of the concrete block of test specimen and friction pair close contact;
Step b. fixes a backing plate on the side of the concrete block of test specimen, and makes the acting surface of backing plate and the side close contact of concrete block;
Step c regulates height adjustment bolt, makes the first pressure transducer and height adjustment bolt close contact and produces prefabricating load, recording described prefabricating load;
Steps d. lifting jack increases progressively applying lateral load step by step to concrete block, until destroyed by test specimen, record the lateral loads at different levels shown by the second pressure transducer in this process, record the corresponding pressure between test specimen 12 shown by the first pressure transducer and friction pair 7 simultaneously.
Compared with prior art, the invention has the beneficial effects as follows:
(1) owing to only arranging a shear connector in test specimen of the present invention, and, shear connector is perpendicular to steel plate and be positioned at the center at the interface of steel plate and concrete block, make the path of Shear transfer between steel-concrete interface single, not by the impact of the factor such as deviation, multiple shear connector welding quality difference, multiple shear connector surrounding concrete mass discrepancies of shear connector welding position, avoid the situation of load maldistribution in each shear connector in traditional push out test, therefore, it is possible to measure the bearing capacity of single shear connector exactly.In addition, because test specimen is placed between upper reaction plate and base, can only be displaced sideways, compared with the prior art, the phenomenon that concrete upwarps out from steel plate can not occur, therefore can be used for measuring the cohesive force between steel plate when not having shear connector and concrete.Test specimen of the present invention is applicable to measure shear connector bearing capacity, steel-concrete interfacial adhesion, has good economy and applicability.
(2) further, the present invention by the first and second pressure transducers, can measure simultaneously act on test specimen side loaded to the pressure with end face direction, thus can correct the impact of loading bias, obtain accurate steel-concrete interface side to shear value; In addition, test unit volume of the present invention is little, easily makes, the restriction of the place equipment that is not put to the test; The sample dimensions adopted is little, and making is simple and quality is easy to control, and test specimen inside is only provided with zero or a shear connector.
Accompanying drawing explanation
Fig. 1 is the structural representation of test specimen of the present invention.
Fig. 2 is the structural representation of the inventive method test unit used.
Fig. 3 is working state schematic representation of the present invention.
Embodiment
As shown in Figure 1, the present invention comprises steel plate 15, concrete block 17, stirrup and shear connector 16 for the test specimen carrying out the test of steel-concrete interface shear stress web member shear-carrying capacity.Wherein, shear connector 16 is one.Concrete block 17 is rectangular-shaped and its xsect is square.Stirrup to be formed by reinforcing bar 19 colligation and the xsect surrounded by reinforcing bar 19 is foursquare rectangular parallelepiped framework.Stirrup is cast in concrete block 17, and the geometric center of stirrup overlaps with the geometric center of concrete block 17, and wherein two opposite side of the xsect of stirrup are parallel with wherein two opposite side of the xsect of concrete block 17.Concrete block 17 is cast on steel plate 15, and the rod end of shear connector 16 is welded on steel plate 15, and shear connector 16 is perpendicular to steel plate 15 and be positioned at the center at the interface of steel plate 15 and concrete block 17.
As shown in Figure 2, the test unit utilizing test specimen of the present invention to carry out the test of steel-concrete interface shear stress web member shear-carrying capacity comprises: base 1, upper reaction plate 2, first pressure transducer 5, friction pair 7, lifting jack 3, second pressure transducer 4 and lateral reaction plate 6.Wherein, the workplace of base 1 is provided with for fixing by the groove 10 of subjects; Groove 10 is relative with friction pair 7 so that when test specimen 12 is placed in groove 10 and is applied in downward acting force, this test specimen 12 top of concrete can with friction pair 7 close contact.Upper reaction plate 2 is fixedly connected with base 1, and upper reaction plate 2 is positioned at the top of the workplace 8 of base 1, first pressure transducer 5 and friction pair 7 are placed between the workplace 8 of reaction plate 2 and base 1, the first pressure transducer 5 between upper reaction plate and friction pair 7 and the first pressure transducer 5 respectively with upper reaction plate and friction pair 7 close contact.Lateral reaction plate 6 and base 1 are fixedly connected, and the base of the second pressure transducer 4 and the workplace of lateral reaction plate 6 are fixedly connected, the other end of the second pressure transducer 4 and lifting jack 3 close contact.Lifting jack 3 loads the transverse direction of test specimen 12 for realizing, and lifting jack 3 can have charger that is identical or similar functions by other and substitute.The main body of base 1 can select H profile steel beam, I section steel beam, weldability girder steel etc., in the middle and head ribbed stiffener is set, at afterbody, ribbed stiffener and reaction plate are set.Upper reaction plate can be one piece of steel deck-plate, this steel deck-plate is fixedly mounted on base 1 by four screw rods, and the center section of four screw rods is slightly thicker than two ends, and two ends are with external thread, steel deck-plate is connected with base 1 by bolt with screw rod, and the height adjustable of steel deck-plate.
As the preferred embodiment of the present invention, upper reaction plate 2 also can be provided with height adjustment bolt 10, and height adjustment bolt 9 runs through reaction plate 2.Height adjustment bolt 9 and upper reaction plate 2 threaded engagement, and height adjustment bolt 9 and the first pressure transducer 5 close contact, make test specimen 12 that the displacement of short transverse not occur under lateral load.
If test unit used in the present invention does not use height adjustment bolt 9, then should make reaction plate 2 directly with the first pressure transducer 5 close contact, with the displacement making test specimen 12 that short transverse not occur under lateral load.
Describe in detail below in conjunction with Fig. 1, Fig. 2 and Fig. 3 and implement the concrete test method of one of the present invention:
Test specimen 12 is fixed in the groove 10 of test unit by step a., and makes bottom surface and groove 10 close contact of the steel plate of test specimen 12, end face 13 and friction pair 7 close contact of the concrete block of test specimen 12;
Step b. fixes a backing plate 11 in the side 14 of the concrete block of test specimen 12, and makes the acting surface of backing plate 11 and side 14 close contact of concrete block;
Step c regulates height adjustment bolt 9, makes the first pressure transducer 5 and height adjustment bolt 9 close contact and produces prefabricating load, recording described prefabricating load;
Steps d. lifting jack 3 increases progressively applying lateral load step by step to concrete block, until test specimen 12 destroys.Record the lateral loads at different levels shown by the second pressure transducer 4 in this process; Lateral load can produce pressure after applying between test specimen 12 and friction pair 7, records step by step under lateral loads, the test specimen 12 shown by the first pressure transducer 5 and the corresponding pressure between friction pair 7; Pressure makes to produce friction force in friction pair 7, and it is exactly act on the shearing on the shear connector 16 of test specimen 12 that the lateral loads at different levels that the second pressure transducer 4 records deduct friction force.
Claims (2)
1. one kind for carry out steel-concrete interface shear stress web member shear-carrying capacity test test specimen, comprise steel plate, concrete block, stirrup and shear connector, it is characterized in that: described concrete block, steel plate and shear connector are respectively one, concrete block is rectangular-shaped and its xsect is square, and stirrup is the xsect surrounded by reinforcing bar is foursquare rectangular parallelepiped; Stirrup is cast in concrete block, and the geometric center of stirrup overlaps with the geometric center of concrete block, and wherein two opposite side of the xsect of stirrup are parallel with wherein two opposite side of the xsect of concrete block; Concrete block is cast on steel plate, and the rod end of described shear connector is welded on steel plate, and described shear connector is perpendicular to steel plate and be positioned at the center at the interface of steel plate and concrete block.
2. use the test specimen of claim 1 to carry out a method for steel-concrete interface shear stress web member shear-carrying capacity test, it is characterized in that:
Test unit for carrying out the test of steel-concrete interface shear stress web member shear-carrying capacity comprises base (1), upper reaction plate (2), first pressure transducer (5), friction pair (7), lifting jack (3), second pressure transducer (4) and lateral reaction plate (6), the workplace of described base (1) is provided with for fixing by the groove of subjects (10), described groove (10) is relative with friction pair (7), described upper reaction plate (2) and base (1) are fixedly connected and upper reaction plate is positioned at the top of the workplace (8) of base (1), described first pressure transducer (5) and friction pair (7) are placed between described upper reaction plate (2) and the workplace (8) of base (1), described first pressure transducer (5) to be positioned between reaction plate and friction pair (7) and described first pressure transducer (5) respectively with upper reaction plate (2) and friction pair (7) close contact, described lateral reaction plate (6) and base (1) are fixedly connected, and the base of the second pressure transducer (4) and the workplace of described lateral reaction plate (6) are fixedly connected, the other end of the second pressure transducer (4) and lifting jack (3) close contact, described upper reaction plate also includes height adjustment bolt (9), described height adjustment bolt (9) runs through reaction plate (2) and height adjustment bolt (9) and upper reaction plate (2) threaded engagement, described height adjustment bolt (9) and described first pressure transducer (5) close contact,
Described method of carrying out the test of steel-concrete interface shear stress web member shear-carrying capacity comprises the steps:
Described test specimen (12) is fixed in the groove (10) of described test unit by step a., and makes bottom surface and groove (10) close contact of the steel plate of test specimen (12), end face (13) and friction pair (7) close contact of the concrete block of test specimen (12);
Step b. fixes a backing plate (11) on the side (14) of the concrete block of test specimen (12), and makes the acting surface of backing plate (11) and side (14) close contact of concrete block;
Step c regulates height adjustment bolt (9), makes the first pressure transducer (5) and height adjustment bolt (9) close contact and produces prefabricating load, recording described prefabricating load;
Steps d. lifting jack (3) increases progressively applying lateral load step by step to concrete block, until destroyed by test specimen (12), record the lateral loads at different levels shown by the second pressure transducer (4) in this process, record the corresponding pressure between test specimen (12) shown by the first pressure transducer (5) and friction pair (7) simultaneously, described pressure makes to produce corresponding friction force in friction pair (7), the lateral loads at different levels that second pressure transducer (4) records deduct corresponding friction force and act on shearing on the shear connector (16) of test specimen (12) exactly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210416210.XA CN102879282B (en) | 2012-10-26 | 2012-10-26 | The test specimen of steel-concrete interface shear stress web member shear-carrying capacity test and method |
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| CN201210416210.XA CN102879282B (en) | 2012-10-26 | 2012-10-26 | The test specimen of steel-concrete interface shear stress web member shear-carrying capacity test and method |
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| CN102879282B true CN102879282B (en) | 2015-08-12 |
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| CN108760520A (en) * | 2018-07-27 | 2018-11-06 | 山东大学 | A kind of steel applying pressure-concrete push out test loading device and method |
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| CN110702602B (en) * | 2019-10-29 | 2022-05-13 | 广西大学 | Device and method for testing cohesiveness of reinforced concrete under bending-shearing action |
| CN111398065B (en) * | 2020-04-24 | 2024-07-02 | 华侨大学 | Superimposed surface shearing resistance testing device under high temperature |
| CN112113860B (en) * | 2020-09-18 | 2023-12-08 | 山东和富工程检测有限公司 | Test device for testing bearing capacity of anchoring shear of groove type embedded assembly for building curtain wall |
| CN112326461B (en) * | 2020-09-22 | 2022-02-22 | 河南大学 | Shear resistance test device for assembly type connecting piece |
| CN113607640B (en) * | 2021-07-21 | 2022-06-21 | 清华大学 | Test analysis method and device for macroscopic occlusal force of steel pipe concrete interface |
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|---|---|---|---|---|
| US4748855A (en) * | 1987-06-11 | 1988-06-07 | Barnoff Robert M | Device for in situ testing of concrete |
| CN102156097A (en) * | 2010-12-10 | 2011-08-17 | 浙江大学 | Steel-concrete interface shear stress transmission testing device |
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2012
- 2012-10-26 CN CN201210416210.XA patent/CN102879282B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4748855A (en) * | 1987-06-11 | 1988-06-07 | Barnoff Robert M | Device for in situ testing of concrete |
| CN102156097A (en) * | 2010-12-10 | 2011-08-17 | 浙江大学 | Steel-concrete interface shear stress transmission testing device |
Non-Patent Citations (1)
| Title |
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| "钢混组合结构中剪力连接件试验研究";肖林;《中国优秀硕士学位论文数据库》;20081215(第12期);第12页 * |
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