CN111707611B - FRP (fiber reinforced plastic) bar and concrete bonding performance load holding and testing device and using method thereof - Google Patents
FRP (fiber reinforced plastic) bar and concrete bonding performance load holding and testing device and using method thereof Download PDFInfo
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- CN111707611B CN111707611B CN202010588025.3A CN202010588025A CN111707611B CN 111707611 B CN111707611 B CN 111707611B CN 202010588025 A CN202010588025 A CN 202010588025A CN 111707611 B CN111707611 B CN 111707611B
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- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
Abstract
An FRP rib and concrete bonding performance load holding and testing device and a using method thereof. The invention adopts a method of adding a spherical hinge at one end, so that the steel plates at the end parts are pushed in parallel to ensure that the axis of the bar material is pulled. The device does not need to adopt an independent load sensor, adopts a method that a connecting sleeve with an internal thread and an external light circle is pasted with a resistance strain gauge, so that the device can be used as the load sensor, simplifies a test device, and reduces the cost problem that a large number of load sensors are occupied for long-term load holding. The sleeve load holding device is simple to operate and can effectively keep the drawing force. The invention combines the load holding test and the bonding performance test into a whole, does not need to use two devices to carry out the load holding test and the test on the bonding performance of the FRP rib and the concrete interface under the long-term action of load, and forms a test device on the basis of the load holding device.
Description
Technical Field
The invention belongs to the field of civil engineering, and particularly relates to a load holding and testing device for the bonding performance of FRP (fiber reinforced plastic) bars and concrete and a using method thereof.
Background
The steel bar is widely applied to modern engineering structures as a building material with excellent performance. However, in recent years, the problems of corrosion and deterioration of reinforced concrete structures and steel structures are becoming more serious, and the corrosion of the steel bars is the most common. The corrosion of the steel bars has a serious impact on the bearing capacity and the applicability of the structure, which not only affects the normal use and the service life of the structure, but also causes a great deal of potential safety and accident hazards, and the maintenance and reinforcement costs caused by the corrosion are quite expensive. Aiming at the problem of concrete structure corrosion, the anticorrosion measures adopted at home and abroad at present mainly comprise the adoption of high-performance concrete, the prevention of reinforcement corrosion, the coating of a concrete surface and the like. Although the measures can improve the durability of the reinforced concrete structure, the core problem affecting the durability of the concrete structure, namely the reduction and even loss of the bearing capacity of the structure caused by the corrosion of the steel bars, is not completely solved.
In order to fundamentally solve the problem of corrosion resistance of a reinforced concrete structure, a novel structural material is adopted. Fiber Reinforced composite (FRP) is a composite material made of high-strength continuous fibers bonded by a bonding resin colloid. The FRP rib has high tensile strength, good corrosion resistance and durability, light weight, electromagnetic resistance, easy processing and close thermal expansion coefficient to concrete. The steel bar rust-proof steel bar is used for replacing common steel bars in a concrete structure, and the problem of engineering failure caused by steel bar corrosion can be fundamentally solved. Therefore, in recent years, the FRP bars have wide application prospects in buildings, bridges, underground engineering, ocean engineering, tunnels and civil engineering with special requirements.
The good bonding performance between the FRP bars and the concrete is a foundation for ensuring the FRP bars and the concrete to work cooperatively under the action of external load, and is also a key for replacing reinforcing steel bars with the FRP bars to be applied to a concrete structure. The quality of the bonding performance determines the cooperative working capability of the FRP rib and the concrete. The good and bad of the bonding performance between the concrete and the FRP bars is the basis for researching the mechanical property of the FRP bar concrete, and directly determines whether the material can be used in a large scale. Meanwhile, the cohesiveness of the reinforced concrete and the reinforced concrete is also an important influence factor related to stress, damage form, load, crack, deformation, analysis and design in the FRP reinforced concrete structure. In the using stage, whether the excellent performance of the FRP rib can be fully exerted is directly related to the bonding degree between the FRP rib and the concrete. The FRP bars are very different from reinforcing bars in terms of the properties of the material itself and the surface form of the FRP bars. Therefore, the bonding properties between the FRP bars and the concrete and between the bars and the concrete are very different in terms of mechanics, and it is necessary to study the bonding properties between the FRP bars and the concrete.
The study of the adhesion between FRP bars and concrete began in Malvar 1995, after which there were many more systematic studies by researchers. In the existing research, the bonding stress of an FRP bar and a concrete interface is mainly measured by adopting a drawing test, and the bonding performance of the steel bar and the concrete is evaluated by mainly measuring the average bonding stress by using the drawing test in specifications of various countries. Although many domestic and foreign scholars research on the performance, most research works focus on the short-term bonding performance of the FRP bar and concrete interface, and few researches are made on the long-term performance of the FRP bar and concrete interface bonded under continuous load, especially under the corrosion service environment (coupling effect of load and corrosion environment). The test methods and test equipment selected by different researchers are different, and transverse comparison is difficult. Although the existing load holding device can realize load holding and loading, a plurality of defects still exist and need to be researched and solved. If a lever loading mode is used for loading, the occupied space of the device is large, and a heavy object for loading is easy to change under the influence of the environment and is not safe enough. In the past research, two sets of test devices are often needed for a load holding device and a test device for researching the bonding property of the FRP rib and the concrete interface under the long-term action of load, and the test devices are not convenient and fast. Therefore, a set of device capable of simultaneously realizing load holding and testing of the FRP bar and the concrete bonding performance needs to be established as early as possible.
Disclosure of Invention
The invention provides a FRP bar and concrete bonding performance load holding and testing device and a using method thereof, aiming at the problem that the FRP bar and concrete bonding performance load holding test device is difficult to ensure that the axis of a bar material is pulled due to the load applied by manually rotating a nut.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the device for holding load and testing the bonding performance of the FRP (fiber reinforced plastic) bar and the concrete is characterized by comprising a bonding test piece consisting of a concrete cubic test block, a PVC (polyvinyl chloride) pipe and the FRP bar, a prestressed finish rolling threaded steel bar, a spherical hinge, a steel plate, a connecting rod and a connecting sleeve; the number of the prestressed finish rolling twisted steel bars is four, the bottoms of the prestressed finish rolling twisted steel bars jointly penetrate through two bottom steel plates, and the tops of the prestressed finish rolling twisted steel bars jointly penetrate through one top steel plate; the two bottom steel plates are respectively arranged at the top and the bottom of the concrete cubic test block to limit the concrete cubic test block;
the steel plate at the top is provided with a groove which is in rotary contact with the end part of the spherical hinge, one end of the reinforced circular steel tube is fixedly connected with the steel plate at the top, the other end of the reinforced circular steel tube is sleeved at one end of a connecting rod, and one end of the connecting rod is fixedly connected with the spherical hinge into a whole; the FRP ribs penetrate through the steel plate at the bottom, the top end of the FRP ribs is fixedly connected with a bonding sleeve, and the FRP ribs and the bonding sleeve are connected through internally poured structural adhesive; the top of the bonding sleeve and the other end of the connecting rod are connected into the connecting sleeve through threads; and the FRP ribs are driven upwards to bear force, and corresponding data are collected, so that a load holding test and a performance test are completed.
Further, the steel plate at the top is a variable cross-section steel plate.
Furthermore, four rectangular stiffening rib steel plates are uniformly arranged along the circumferential direction of the reinforced circular steel tube and are fixedly connected with the variable cross-section steel plate, and the reinforced circular steel tube and the variable cross-section steel plate are supported from four directions so as to ensure that the groove parts formed by the spherical hinges are not locally damaged.
Furthermore, the outer ends of the two bottom steel plates are respectively provided with a finish rolling nut to be screwed with the corresponding prestress finish rolling twisted steel, and a steel washer is arranged between the finish rolling nut and the corresponding bottom steel plate.
Furthermore, a strain gauge is attached to the surface of the connecting sleeve and also serves as a load sensor, and the strain gauge is connected with the resistance strain gauge through a connecting wire.
Furthermore, a finish rolling nut is arranged at the bottom of the variable cross-section steel plate and is screwed with the corresponding pre-stressed finish rolling twisted steel, and a steel washer is arranged between the finish rolling nut and the variable cross-section steel plate; continuous load is realized by rotating the four finish rolling nuts at the position of the variable cross-section steel plate. Specifically, load holding test:
the method comprises the following steps that four finish rolling nuts at the position of a variable cross-section steel plate are rotated to apply outward force to the variable cross-section steel plate, FRP (fiber reinforced plastic) ribs in a bonding test piece are driven to bear force, meanwhile, the steel plate at the bottom limits the movement of a concrete cube test block, and therefore load holding of the bonding test piece is achieved; the magnitude of the continuous load is obtained by using the connecting sleeve pasted with the strain gauge as a load sensor, and fine adjustment of the load is realized by slightly rotating the finish rolling nut; during the test, parallelism between the steel plates must be ensured.
Furthermore, two intermediate steel plates are arranged between the variable cross-section steel plate and the connecting sleeve, and the two intermediate steel plates jointly penetrate through the four pre-stressed finish-rolled twisted steel bars; the top of the middle steel plate is provided with a feed-through drawing instrument which is sleeved outside the connecting rod, the bottom of the middle steel plate is provided with four finish rolling nuts to be screwed with corresponding pre-stressed finish rolling threaded steel bars, and a steel washer is arranged between each finish rolling nut and the middle steel plate; the other middle steel plate is positioned at the top of the straight-through drawing instrument and at the bottom of the four rectangular stiffening rib steel plates; and displacement meters are arranged on the middle steel plate at the bottom of the rectangular stiffening rib steel plate and the bottom of the FRP rib to finish the bonding performance test. Specifically, the bond strength test:
the straight-through drawing instrument pushes against the middle steel plate above the straight-through drawing instrument to apply upward force, the pulling force is transmitted to the FRP ribs in the bonding test piece through the spherical hinge, the connecting rod, the connecting sleeve and the bonding sleeve respectively, and meanwhile, the bottom steel plate above the concrete cube test piece limits the movement of the FRP ribs, so that the drawing force is applied to the bonding test piece; the slippage of the free end and the loading end of the FRP tendon is measured by a displacement meter, the drawing force is measured by a connecting sleeve which is also used as a load sensor, and finally, the bonding strength between the FRP tendon and the concrete is calculated by applying a formula.
The invention combines the load holding test and the bonding performance test into a whole, does not need to use two devices to carry out the load holding test and the test on the bonding performance of the FRP rib and the concrete interface under the long-term action of load, and forms a test device on the basis of the load holding device.
The invention has the beneficial effects that:
1. the invention provides a device for testing and testing the bonding property of FRP (fiber reinforced plastic) bars and concrete, which has a simple structure and is easy to operate;
2. the load holding device can provide reliable and stable load for the bonding test piece by screwing the finish rolling nut, can meet the requirement of long-term loading, and the spherical hinge at the end part can rotate when encountering eccentric force, so that the steel plate can be stably pushed, and axial tension can be applied to the bonding test piece, so that adverse effect on the test caused by eccentric tension is avoided;
3. the load holding device can apply continuous load to the test piece without using a reaction frame, and the connecting sleeve adhered with the strain gauge is also used as a load sensor, so that the space occupied by the loading device is greatly reduced;
4. the invention can be used as a load holding device for the bonding property of the FRP rib and the concrete, and can form a device for testing the bonding property of the FRP rib and the concrete through local modification;
5. the invention is made of corrosion-resistant stainless steel materials, and is not easy to rust.
Drawings
FIG. 1 is a schematic view of a FRP rib and concrete adhesion performance load holding test device according to the present invention;
FIG. 2 is a schematic view of a steel plate (square);
FIG. 3 is a schematic view of a steel washer;
FIG. 4 is a schematic view of a finish rolling nut;
FIG. 5 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 6 is a schematic view of the FRP rib and concrete bond property testing apparatus of the present invention;
FIG. 7 is a sectional view taken along line B-B in FIG. 6;
in the figure, 1 is a steel plate (square), 2 is a concrete cube test block, 3 is a PVC pipe, 4 is an FRP rib, 5 is a steel washer, 6 is a finish rolling nut, 7 is a prestressed finish rolling twisted steel, 8 is a bonding sleeve, 9 is a connecting sleeve, 10 is a connecting rod, 11 is a reinforced round steel pipe, 12 is a rectangular stiffening rib steel plate, 13 is a spherical hinge, 14 is a strain gauge, 15 is a resistance strain gauge, 16 is a connecting wire, 17 is a feed-through type drawing gauge, and 18 is a displacement gauge.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Example 1
The device is used as a load-holding test device for the bonding property of FRP (fiber reinforced Plastic) bars and concrete, and comprises a square steel plate 1, a concrete cube test block 2, a PVC (polyvinyl chloride) pipe 3, FRP bars 4, a steel washer 5, a finish rolling nut 6, a prestressed finish rolling threaded steel bar 7, a bonding sleeve 8, a connecting sleeve 9, a connecting rod 10, a reinforced circular steel pipe 11, a rectangular stiffening rib steel plate 12, a spherical hinge 13, a strain gauge 14, a resistance strain gauge 15 and a connecting wire 16, as shown in figure 1. The end part of the spherical hinge is a variable cross-section steel plate with four corners provided with round reserved holes, and a groove is reserved in the middle of the variable cross-section steel plate to be in rotary contact with the spherical hinge. In order to avoid the steel plate from becoming heavy due to the larger thickness of the steel plate, the steel plate at the top is designed into a variable cross-section steel plate.
As shown in fig. 2, the square steel plate 1 has five prepared holes respectively arranged at four corners and the center, the prepared holes are all circular through holes, the diameter of the prepared holes at the four corners is larger than that of the prestressed finish-rolled twisted steel 7, and the diameter of the prepared hole at the center is larger than the outer diameter of the PVC pipe 3. The concrete cube test block 2, the PVC pipe 3 and the FRP rib 4 form a standard bonding test piece, the bonding test piece is demolded after being poured for 48 hours, maintenance is carried out for 28 days under standard conditions after the demolded test piece is demolded, and one end of the FRP rib 4 is fixed with the bonding sleeve 8 through glue pouring.
As shown in fig. 3, the steel washer 5 is circular and is disposed between the square steel plate 1 or the variable cross-section steel plate and the finish rolling nut 6, and has an inner diameter slightly larger than the diameter of the prestressed finish rolling deformed bar 7 and an outer diameter larger than the diameter of the circumscribed circle of the finish rolling nut 6.
As shown in fig. 4, the finish rolling nut 6 is a hexagon nut, and the pre-stressed finish rolling twisted steel 7 is connected with the square steel plate 1 and the spherical hinge 13 through the finish rolling nut 6 and the steel washer 5; the connecting sleeve 9 is provided with internal threads and has a smooth outer surface, and the bonding sleeve 8 and the connecting rod 10 are connected together through the connecting sleeve 9; the reinforced circular steel tube 11 is fixed with the variable cross-section steel plate at the end part of the spherical hinge 13, and is sleeved on the connecting rod 10, and a certain distance is reserved between the reinforced circular steel tube and the connecting rod 10. A certain distance is left between the reinforced circular steel tube 11 and the connecting sleeve 9. The connecting rod 10 is made of steel and is integral with the ball joint 13.
As shown in fig. 5, the rectangular stiffening rib steel plate 12 is used for connecting the reinforced circular steel tube 11 and the spherical hinge 13 in four directions, so as to prevent the groove part formed by the spherical hinge from being locally damaged, and the spherical hinge 13 can rotate under the action of eccentric force.
The two square steel plates 1 at the bottom are respectively arranged at two sides of the concrete cubic test block 2, and the distance between the two steel plates is slightly larger than the side length of the concrete cubic test block 2.
The PVC pipe 3 is directly sleeved on the FRP rib 4 and used for separating the concrete cubic test block 2 from the FRP rib 4 at the free section, so that the anchoring length of the FRP rib 4 in the concrete cubic test block 2 is 5d (5 times of the diameter of the FRP rib), and the inner diameter of the PVC pipe 3 is slightly larger than the diameter of the FRP rib 4.
And a strain gauge 14 is pasted on the surface of the connecting sleeve 9 and also serves as a load sensor. The strain gauge 14 is connected with a resistance strain gauge 15 through a connecting lead 16, the connecting sleeve 9 is pulled when the load is held, the tensile strain can be displayed by the resistance strain gauge 15, the tensile strain can be converted into the tensile force applied to the connecting sleeve 9 through calculation, and the tensile force applied to the connecting sleeve 9 is the continuous load applied to the bonded test piece.
Load test device is held with concrete adhesion property to FRP muscle, at the continuous load of normal use state, realizes through four finish rolling nuts 6 of rotatory variable cross section steel sheet inboard simultaneously, applys outside power to the variable cross section steel sheet through rotatory finish rolling nut 6, drives FRP muscle 4 atress in the bonding test piece, and the square steel sheet 1 of bottom has restricted the removal of concrete cube test block 2 in the bonding test piece simultaneously, and then the realization is to holding of bonding test piece lotus. The magnitude of the continuous load is obtained by using the connecting sleeve 9 adhered with the strain gauge as a load sensor, and the fine adjustment of the load is realized by slightly rotating the finish rolling nut 6. During the test process, the parallelism of the square steel plate surface and the variable cross-section steel plate surface must be ensured.
Example 2
The invention is used as a FRP bar and concrete bonding performance testing device, as shown in figure 6, a newly-added feed-through drawing instrument 17, a displacement meter 18 and two middle square steel plates are arranged on the basis of a load holding device, wherein one steel plate is arranged between a connecting sleeve 9 and a rectangular stiffening rib steel plate 12 and is used for supporting the upper feed-through drawing instrument 17, the lower part of the steel plate is fixed by a steel washer 5 and a finish rolling nut 6, and the other steel plate is arranged above the feed-through drawing instrument 17 and is used for propping against the rectangular stiffening rib steel plate 12; the rectangular stiffening rib steel plates 12 are arranged to be rectangular and are convenient for the square steel plates 1 below to support; the straight-through drawing instrument 17 is used for applying drawing force; the displacement meter 18 is respectively arranged on the square steel plate 1 above the straight-through drawing instrument 17 and the lowest end of the FRP rib 4; as shown in fig. 7, the steel washer 5 and the finish rolling nut 6 inside the variable cross-section steel plate are removed.
Further, the diameter of the central prepared hole of the square steel plate 1 in the middle is larger than that of the connecting rod 10.
The displacement meters 18 are used for measuring the displacement of the loading end and the free end, one displacement meter is respectively arranged at the left end and the right end of the square steel plate 1, and the average value of the two displacement meters is taken during calculation and used for eliminating the inclination deviation in the loading process.
FRP muscle and concrete bonding property testing arrangement, during the test, the instrument 17 is drawn to the punching to the centre steel sheet of its top and is applyed ascending power, and the pulling force passes through ball pivot 13, connecting rod 10, connecting sleeve 9, the FRP muscle 4 in the bonding test piece that bonds respectively, and the square steel sheet 1 of 2 tops of concrete cube test blocks has restricted the removal of concrete cube test block 2 in the bonding test piece simultaneously, and then the realization is exerted the pulling force to the bonding test block. The contents to be measured are: free, loaded end slip and pull force. The slippage of the free end and the loading end is measured by a displacement meter 18, the drawing force is measured by a connecting sleeve 9 which is also used as a load sensor, and finally the bonding strength between the FRP rib and the concrete can be calculated by applying a formula.
Therefore, the invention adopts a method of adding a spherical hinge at one end to push the steel plates at the end part in parallel so as to ensure that the axle center of the bar material is pulled. The device does not need to adopt an independent load sensor, adopts a method that a connecting sleeve with an internal thread and an external light circle is pasted with a resistance strain gauge, so that the device can be used as the load sensor, simplifies a test device, and reduces the cost problem that a large number of load sensors are occupied for long-term load holding. The sleeve load holding device is simple to operate and can effectively keep the drawing force.
Finally, the present invention is not limited to the above-described embodiments, and many modifications may be made on the basis of the essence of the present invention, and all modifications that can be directly suggested to one skilled in the art on the basis of the present disclosure should be considered as the scope of the present invention.
Claims (9)
- The device for holding load and testing the bonding performance of the FRP ribs and the concrete is characterized by comprising a bonding test piece consisting of a concrete cubic test block, a PVC pipe and FRP ribs, a prestressed finish rolling threaded steel bar, a spherical hinge, a steel plate, a connecting rod, a connecting sleeve and a reinforced circular steel pipe; the prestressed finish rolling twisted steel is four, the bottoms of the prestressed finish rolling twisted steel penetrate through two bottom steel plates together, and the top of the prestressed finish rolling twisted steel penetrates through one top steel plate together; the two bottom steel plates are respectively arranged at the top and the bottom of the concrete cubic test block to limit the concrete cubic test block;the steel plate at the top is provided with a groove which is in rotary contact with the end part of the spherical hinge, one end of the reinforced circular steel tube is fixedly connected with the steel plate at the top, the other end of the reinforced circular steel tube is sleeved at one end of a connecting rod, and one end of the connecting rod is fixedly connected with the spherical hinge into a whole; the FRP ribs penetrate through the two steel plates at the bottom, the top ends of the FRP ribs are fixedly connected with bonding sleeves, and the FRP ribs and the bonding sleeves are connected through internally poured structural adhesive; the top of the bonding sleeve and the other end of the connecting rod are connected into the connecting sleeve through threads; and the FRP ribs are driven upwards to bear force, and corresponding data are collected, so that a load holding test and a performance test are completed.
- 2. The FRP rib and concrete bonding performance load-holding and testing device as claimed in claim 1, wherein the steel plate at the top is a variable cross-section steel plate.
- 3. The FRP rib and concrete bonding performance holding and testing device as claimed in claim 2, wherein four rectangular stiffening rib steel plates are uniformly arranged along the circumferential direction of the round reinforcing steel pipe, the four rectangular stiffening rib steel plates are fixedly connected with the variable cross-section steel plates, and the round reinforcing steel pipe and the variable cross-section steel plates are supported from four directions so as to ensure that the groove part formed by the spherical hinge is not locally damaged.
- 4. The FRP bar and concrete bonding performance holding and testing device according to claim 3, wherein the outer ends of the two bottom steel plates are respectively provided with a finish rolling nut to be screwed with the corresponding prestress finish rolling thread steel bar, and a steel washer is arranged between the finish rolling nut and the corresponding bottom steel plate.
- 5. The FRP rib and concrete bonding performance load-holding and testing device as claimed in claim 4, wherein a strain gauge is pasted on the surface of the connecting sleeve and also used as a load sensor, and the strain gauge is connected with a resistance strain gauge through a connecting wire.
- 6. The FRP bar and concrete bonding performance holding and testing device according to claim 5, wherein the bottom of the variable cross-section steel plate is provided with a finish rolling nut to be screwed with a corresponding prestress finish rolling threaded steel bar, and a steel washer is arranged between the finish rolling nut and the variable cross-section steel plate; continuous load is realized by rotating the four finish rolling nuts at the position of the variable cross-section steel plate.
- 7. The FRP bar and concrete bonding performance load-holding and testing device according to claim 5, wherein two intermediate steel plates are further arranged between the variable cross-section steel plate and the connecting sleeve, and the two intermediate steel plates jointly penetrate through four prestressed finish-rolled threaded steel bars; the top of the middle steel plate is provided with a feed-through drawing instrument which is sleeved outside the connecting rod, the bottom of the middle steel plate is provided with four finish rolling nuts to be screwed with corresponding pre-stressed finish rolling threaded steel bars, and a steel washer is arranged between each finish rolling nut and the middle steel plate; the other middle steel plate is positioned at the top of the straight-through drawing instrument and at the bottom of the four rectangular stiffening rib steel plates; and displacement meters are arranged on the middle steel plate at the bottom of the rectangular stiffening rib steel plate and the bottom of the FRP rib to finish the bonding performance test.
- 8. The use method of the FRP rib and concrete bonding performance load holding and testing device according to claim 6 is characterized in that a load holding test comprises the following steps:the method comprises the following steps that four finish rolling nuts at the position of a variable cross-section steel plate are rotated to apply outward force to the variable cross-section steel plate, FRP (fiber reinforced plastic) ribs in a bonding test piece are driven to bear force, meanwhile, the steel plate at the bottom limits the movement of a concrete cube test block, and therefore load holding of the bonding test piece is achieved; the magnitude of the continuous load is obtained by using the connecting sleeve pasted with the strain gauge as a load sensor, and fine adjustment of the load is realized by slightly rotating the finish rolling nut; during the test, parallelism between the steel plates must be ensured.
- 9. The use method of the FRP rib and concrete bonding performance load-holding and testing device as claimed in claim 7, is characterized in that the bonding strength test:the straight-through drawing instrument pushes against the middle steel plate above the straight-through drawing instrument to apply upward force, the pulling force is transmitted to the FRP ribs in the bonding test piece through the spherical hinge, the connecting rod, the connecting sleeve and the bonding sleeve respectively, and meanwhile, the bottom steel plate above the concrete cube test piece limits the movement of the FRP ribs, so that the drawing force is applied to the bonding test piece; the slippage of the free end and the loading end of the FRP tendon is measured by a displacement meter, the drawing force is measured by a connecting sleeve which is also used as a load sensor, and finally, the bonding strength between the FRP tendon and the concrete is calculated by applying a formula.
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| CN113945452A (en) * | 2021-09-08 | 2022-01-18 | 广东工业大学 | Method for testing bonding performance and durability of FRP (fiber reinforced Plastic) bar and concrete under coupling action |
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| US5325722A (en) * | 1992-08-14 | 1994-07-05 | The United States Of America As Represented By The Secretary Of The Navy | Split pipe testing device for the measurement of bond of reinforcement under controlled confinement |
| CN103234902B (en) * | 2013-04-23 | 2014-11-19 | 金陵科技学院 | Device and method for testing adhesive property between fiber reinforce plastic (FRP) rib and concrete under complicated stress state |
| CN105259107A (en) * | 2015-10-21 | 2016-01-20 | 江苏城市职业学院 | Device for testing bond performance of reinforcing steel bar and concrete through drawing and testing method |
| CN106018270B (en) * | 2016-05-10 | 2018-07-13 | 大连理工大学 | A kind of pull-out test device being suitable for enhancing muscle material bonding-sliding Hysteresis Behavior test |
| CN106525717B (en) * | 2016-11-17 | 2019-01-29 | 东南大学 | Consider the FRP tendons bias pull-out test device and method of curved scissors stress influence |
| CN107607469A (en) * | 2017-08-14 | 2018-01-19 | 哈尔滨工业大学 | A kind of device for FRP enhancing basal body interface adhesive property tests |
| CN111307710A (en) * | 2020-04-10 | 2020-06-19 | 青岛理工大学 | Center drawing device and method for simultaneously measuring bonding strength and sliding distance |
| CN212514210U (en) * | 2020-06-24 | 2021-02-09 | 扬州大学 | FRP muscle and concrete bonding performance hold lotus test device |
| 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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