CN102879282A - Test piece and method for shear capacity testing of steel-concrete interface shear connecting piece - Google Patents
Test piece and method for shear capacity testing of steel-concrete interface shear connecting piece Download PDFInfo
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- CN102879282A CN102879282A CN201210416210XA CN201210416210A CN102879282A CN 102879282 A CN102879282 A CN 102879282A CN 201210416210X A CN201210416210X A CN 201210416210XA CN 201210416210 A CN201210416210 A CN 201210416210A CN 102879282 A CN102879282 A CN 102879282A
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Abstract
The invention discloses a test piece and a method for shear capacity testing of a steel-concrete interface shear connecting piece. The test piece comprises a steel plate, a concrete block, a stirrup and a shear connecting piece, and is characterized in that the number of the shear connecting piece is one, wherein the concrete block is cuboid and the cross section of the concrete block is square; the stirrup is a cuboid stirrup with a square cross section enclosed by a reinforcing steel bar; the stirrup is cast in the concrete block; the geometric center of the stirrup is overlapped with the geometric center of the concrete block; two opposite sides of the cross section of the stirrup are parallel with two opposite sides of the cross section of the concrete block; the concrete block is cast on the steel plate; the rod end of the shear connecting piece is welded to the steel plate; and the shear connecting piece is perpendicular to the steel plate and is positioned in the center of an interface of the steel plate and the concrete block. According to the test piece and the method, the influence of loading eccentricity can be corrected to achieve accurate shear capacity of a combined structure shear connecting piece; and the cohesion of the steel-concrete interface can be measured.
Description
Technical field
The present invention relates to a kind of for measuring test test specimen and the method thereof of shear connector shear-carrying capacity between steel and concrete interface.
Background technology
General employing push out test at present carrys out the Shear transfer between tested steel and concrete, while adopting the shearing strength of push out test research shear connector, if guarantee to release the stressed of all shear connectors in test specimen, equate and synchronous the loading, test findings can reflect the stress performance of each shear connector accurately.But due to the impact that test loads and test specimen is originally experienced 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 etc., and the load that makes very difficult each shear connector of assurance bear is fully equal.The size of the requirement of while pressure testing machine and huge release test specimen makes push out test often be subject to the restriction of testing equipment, test site and funds, and adopts common release test specimen also to be difficult to measure the cohesive force between steel plate and concrete.
Release test specimen when testing the shear connector corrosion on the affecting of shearing bearing capacity, due to the concrete wood property, the situations such as current density, be difficult to guarantee that the corrosion degree of each shear connector is identical, different corrosion degrees cause discontinuity, make the shear connector that corrosion degree is large bear larger load and very fast destruction, affected ultimate bearing capacity, be difficult to judge accurately so the true bearing capacity of corrosion shear connector.And the total quality of releasing test specimen is too large, makes its precision of instrument of weighing that meets range more coarse, is 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 at present special steel-concrete interface shear stress transmission testing device and method
.
Summary of the invention
The purpose of this invention is to provide a kind of for measuring test test specimen and the method thereof of shear connector shear-carrying capacity between steel and concrete interface.
For achieving the above object, the present invention comprises steel plate, mixed earth piece, stirrup and shear connector for the test specimen that carries out the test of steel-concrete interface shear stress web member shear-carrying capacity, wherein, described shear connector is one, it is square that mixed earth piece is rectangular-shaped and its xsect, and stirrup is that 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 mixed earth piece; Mixed earth piece 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 steel plate and the center at the interface of concrete block.
Use test specimen of the present invention to carry out the method for steel-concrete interface shear stress web member shear-carrying capacity test as follows:
Wherein, comprise base for the test unit that carries out the test of steel-concrete interface shear stress web member shear-carrying capacity, upper reaction plate, the first pressure transducer, friction pair, lifting jack, the second pressure transducer and lateral reaction plate, the workplace of described base is provided with for fixing by the groove of test object, 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 the first pressure transducer and friction pair are placed between the workplace of described upper reaction plate and base, described the first pressure transducer between upper reaction plate and friction pair and described the first pressure transducer respectively with upper reaction plate and friction pair close contact, described lateral reaction plate and base are fixedly connected, and the workplace of the base of the second pressure transducer and described lateral reaction plate is 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 the 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:
Step a. is fixed in described test specimen in the groove of described test unit, 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 is regulated height adjustment bolt, makes the first pressure transducer and height adjustment bolt close contact and produces prefabricating load, records described prefabricating load;
Steps d. lifting jack increases progressively step by step and applies lateral load to concrete block, until by the test specimen failure, in this process, the shown lateral loads at different levels of record the second pressure transducer record the corresponding pressure between the first pressure transducer shown test specimen 12 and friction pair 7 simultaneously.
Compared with prior art, the invention has the beneficial effects as follows:
(1) due to a shear connector only being set in test specimen of the present invention, and, shear connector is perpendicular to steel plate and be positioned at steel plate and the center at the interface of concrete block, make the path of Shear transfer between the steel-concrete interface single, be not subject to the impact of the factors such as the deviation of shear connector welding position, a plurality of shear connector welding quality difference, a plurality of shear connector surrounding concrete mass discrepancies, avoid the situation of load maldistribution in each shear connector in traditional push out test, therefore can measure exactly the bearing capacity of single shear connector.Therefore in addition, because test specimen is placed between upper reaction plate and base, can only be displaced sideways, compared with the prior art, concrete can not occur and upwarp the phenomenon of holding from steel plate, can be used for measuring steel plate while there is no shear connector and the cohesive force between 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 is by the first and second pressure transducers, can measure simultaneously act on test specimen side loaded to the pressure with the end face direction, thereby can proofread and correct the eccentric impact of loading, 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, makes simple and quality and is easy to control, and test specimen inside only is provided with zero or a shear connector.
The 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, mixed earth piece 17, stirrup 18 and shear connector 16 for the test specimen that carries out the test of steel-concrete interface shear stress web member shear-carrying capacity.Wherein, shear connector 16 is one.It is square that mixed earth piece 17 is rectangular-shaped and its xsect.Stirrup 18 is that an xsect that is formed and surrounded by reinforcing bar 19 by reinforcing bar 19 colligations is foursquare rectangular parallelepiped framework.Stirrup 18 is cast in concrete block 17, and the geometric center of stirrup 18 overlaps with the geometric center of concrete block 17, and wherein two opposite side of the xsect of stirrup 18 are parallel with wherein two opposite side of the xsect of mixed earth piece 17.Mixed earth piece 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 steel plate 15 and the center at the interface of concrete block 17.
As shown in Figure 2, the test unit that utilizes 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, the first pressure transducer 5, friction pair 7, lifting jack 3, the 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 test object; Groove 10 is relative with friction pair 7 so that test specimen 12 is when being placed in groove 10 and being applied in downward acting force, this test specimen 12 top of concrete can with friction pair 7 close contacts.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, the 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 contacts.Lateral reaction plate 6 is fixedly connected with base 1, and the workplace of the base of the second pressure transducer 4 and lateral reaction plate 6 is fixedly connected, the other end of the second pressure transducer 4 and lifting jack 3 close contacts.Lifting jack 3 is for realizing the horizontal loading to test specimen 12, and the charger that lifting jack 3 can have identical or similar functions by other substitutes.The main body of base 1 can be selected H section steel beam, I section steel beam, weldability girder steel etc., reaches in the middle head ribbed stiffener is set, and at afterbody, ribbed stiffener and reaction plate is set.Upper reaction plate can be a 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 of steel deck-plate is adjustable.
As the preferred embodiment of the present invention, also can be provided with height adjustment bolt 10 on upper reaction plate 2, 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 contacts, 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, should make reaction plate 2 directly and the first pressure transducer 5 close contacts, so that the displacement of short transverse does not occur test specimen 12 under lateral load.
Describe enforcement a kind of concrete test method of the present invention in detail below in conjunction with Fig. 1, Fig. 2 and Fig. 3:
Step a. is fixed in test specimen 12 in the groove 10 of test unit, and makes bottom surface and groove 10 close contacts of the steel plate of test specimen 12, end face 13 and friction pair 7 close contacts 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 contacts of concrete block;
Step c is regulated height adjustment bolt 9, makes the first pressure transducer 5 produce prefabricating load with height adjustment bolt 9 close contacts, records described prefabricating load;
Steps d. lifting jack 3 increases progressively step by step and applies lateral load to concrete block, until test specimen 12 failures.The shown lateral loads at different levels of record the second pressure transducer 4 in this process; Pressure be can produce after lateral load applies between test specimen 12 and friction pair 7, the test specimen 12 that the first pressure transducer 5 is shown and the corresponding pressure between friction pair 7 recorded step by step under lateral loads; Pressure makes in friction pair 7 and produces friction force, and it is exactly the shearing acted 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 carrying out the test specimen of steel-concrete interface shear stress web member shear-carrying capacity test, comprise steel plate, mixed earth piece, stirrup and shear connector, it is characterized in that: described shear connector is one, it is square that mixed earth piece is rectangular-shaped and its xsect, and stirrup is that 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 mixed earth piece; Mixed earth piece 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 steel plate and the center at the interface of concrete block.
2. the method that the test specimen of a right to use requirement carries out the test of steel-concrete interface shear stress web member shear-carrying capacity is characterized in that:
Comprise base 1 for the test unit that carries out the test of steel-concrete interface shear stress web member shear-carrying capacity, upper reaction plate 2, the first pressure transducer 5, friction pair 7, lifting jack 3, the second pressure transducer (4) and lateral reaction plate (6), the workplace of described base (1) is provided with for fixing by the groove (10) of test object, 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 the first pressure transducer (5) and friction pair (7) are placed between the workplace (8) of described upper reaction plate (2) and base (1), described the first pressure transducer (5) be positioned between reaction plate and friction pair (7) and described the first pressure transducer (5) respectively with upper reaction plate (2) and friction pair (7) close contact, described lateral reaction plate (6) is fixedly connected with base (1), and the workplace of the base of the second pressure transducer (4) and described lateral reaction plate (6) is 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 the 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:
Step a. is fixed in described test specimen (12) in the groove (10) of described test unit, and makes bottom surface and groove (10) close contact of the steel plate of test specimen (12), the end face (13) of the concrete block of test specimen (12) and friction pair (7) close contact;
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 is regulated height adjustment bolt (9), makes the first pressure transducer (5) produce prefabricating load with height adjustment bolt (9) close contact, records described prefabricating load;
Steps d. lifting jack (3) increases progressively step by step and applies lateral load to concrete block, until by test specimen (12) failure, in this process, the shown lateral loads at different levels of record the second pressure transducer (4) record the shown test specimen 12 of the first pressure transducer (5) and the corresponding pressure between friction pair 7 simultaneously.
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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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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323340A (en) * | 2013-06-24 | 2013-09-25 | 重庆交通大学 | Mechanical property test device and method of steel-concrete contact interface |
| CN103575644A (en) * | 2013-11-06 | 2014-02-12 | 中交第二航务工程局有限公司 | Test method for matching friction coefficient of contact surface of poured concrete |
| CN103645043A (en) * | 2013-12-18 | 2014-03-19 | 中交第二航务工程局有限公司 | Combined type shear key stress test method |
| CN103645133A (en) * | 2013-11-19 | 2014-03-19 | 河海大学 | Hydraulic fixing device used for measuring bond properties of steel bar with concrete |
| CN103674833A (en) * | 2013-11-29 | 2014-03-26 | 西南交通大学 | Simple shearing test method and device for rock-concrete cement face |
| CN103969181A (en) * | 2014-04-22 | 2014-08-06 | 河海大学 | Testing device for interface dynamic mechanical behavior as well as manufacturing and testing methods thereof |
| CN105842093A (en) * | 2016-04-02 | 2016-08-10 | 浙江大学 | Steel-concrete interface shear force connecting piece fatigue performance test apparatus and application method thereof |
| CN106768996A (en) * | 2017-04-01 | 2017-05-31 | 西南交通大学 | A kind of loading device for peg non-proportional loading model test |
| CN106802255A (en) * | 2016-12-09 | 2017-06-06 | 安徽省建筑工程质量监督检测站 | A kind of crab-bolt shearing resistance loading equipemtn |
| 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 |
| CN110274802A (en) * | 2019-05-29 | 2019-09-24 | 湖北工业大学 | A kind of steel-concrete combined structure, preparation method and shear behavior detection method |
| CN110702602A (en) * | 2019-10-29 | 2020-01-17 | 广西大学 | Device and method for testing cohesiveness of reinforced concrete under bending-shearing action |
| CN111398065A (en) * | 2020-04-24 | 2020-07-10 | 华侨大学 | Testing device for shearing resistance of superposed surface at high temperature |
| CN112113860A (en) * | 2020-09-18 | 2020-12-22 | 山东和富工程检测有限公司 | Test device for testing shear bearing capacity of anchoring of groove type embedded assembly for building curtain wall |
| CN112326461A (en) * | 2020-09-22 | 2021-02-05 | 河南大学 | Shear resistance test device for assembly type connecting piece |
| CN113607640A (en) * | 2021-07-21 | 2021-11-05 | 清华大学 | Test analysis method and device for macroscopic occlusal force of steel pipe concrete interface |
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Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323340A (en) * | 2013-06-24 | 2013-09-25 | 重庆交通大学 | Mechanical property test device and method of steel-concrete contact interface |
| CN103323340B (en) * | 2013-06-24 | 2015-03-04 | 重庆交通大学 | Mechanical property test device and method of steel-concrete contact interface |
| CN103575644A (en) * | 2013-11-06 | 2014-02-12 | 中交第二航务工程局有限公司 | Test method for matching friction coefficient of contact surface of poured concrete |
| CN103575644B (en) * | 2013-11-06 | 2016-04-27 | 中交第二航务工程局有限公司 | Coupling casting concrete surface of contact test method of friction coefficient |
| CN103645133A (en) * | 2013-11-19 | 2014-03-19 | 河海大学 | Hydraulic fixing device used for measuring bond properties of steel bar with concrete |
| CN103674833A (en) * | 2013-11-29 | 2014-03-26 | 西南交通大学 | Simple shearing test method and device for rock-concrete cement face |
| CN103645043A (en) * | 2013-12-18 | 2014-03-19 | 中交第二航务工程局有限公司 | Combined type shear key stress test method |
| CN103645043B (en) * | 2013-12-18 | 2016-05-04 | 中交第二航务工程局有限公司 | A kind of combined type shear connector stress test method of testing |
| CN103969181A (en) * | 2014-04-22 | 2014-08-06 | 河海大学 | Testing device for interface dynamic mechanical behavior as well as manufacturing and testing methods thereof |
| CN105842093B (en) * | 2016-04-02 | 2018-05-22 | 浙江大学 | Steel-concrete interface shear stress Fatigue Behavior of Riveted structure test device and application process |
| CN105842093A (en) * | 2016-04-02 | 2016-08-10 | 浙江大学 | Steel-concrete interface shear force connecting piece fatigue performance test apparatus and application method thereof |
| CN106802255A (en) * | 2016-12-09 | 2017-06-06 | 安徽省建筑工程质量监督检测站 | A kind of crab-bolt shearing resistance loading equipemtn |
| CN106768996A (en) * | 2017-04-01 | 2017-05-31 | 西南交通大学 | A kind of loading device for peg non-proportional loading model test |
| CN106768996B (en) * | 2017-04-01 | 2023-06-16 | 西南交通大学 | Loading device for stud multi-axis fatigue model test |
| 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 |
| CN110274802A (en) * | 2019-05-29 | 2019-09-24 | 湖北工业大学 | A kind of steel-concrete combined structure, preparation method and shear behavior detection method |
| 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 |
| CN110702602A (en) * | 2019-10-29 | 2020-01-17 | 广西大学 | Device and method for testing cohesiveness of reinforced concrete under bending-shearing action |
| CN111398065A (en) * | 2020-04-24 | 2020-07-10 | 华侨大学 | Testing device for shearing resistance of superposed surface at high temperature |
| CN112113860A (en) * | 2020-09-18 | 2020-12-22 | 山东和富工程检测有限公司 | Test device for testing shear bearing capacity of anchoring of groove type embedded assembly for building curtain wall |
| 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 |
| CN112326461A (en) * | 2020-09-22 | 2021-02-05 | 河南大学 | Shear resistance test device for assembly type connecting piece |
| CN113607640A (en) * | 2021-07-21 | 2021-11-05 | 清华大学 | Test analysis method and device for macroscopic occlusal force of steel pipe concrete interface |
| 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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