CN218629449U - Measuring device for interface bonding strength of concrete filled steel tube member - Google Patents

Abstract

The utility model relates to a measurement of concrete filled steel tube component interfacial adhesion intensity specifically is a measuring device of concrete filled steel tube component interfacial adhesion intensity. In order to solve the problem how to measure the interfacial adhesion strength of the concrete filled steel tube member, the event provides a measuring device of the interfacial adhesion strength of the concrete filled steel tube member, including the press, the concrete filled steel tube member, the steel block, force sensor, go up displacement sensor, the bottom of concrete is higher than the bottom face of steel pipe, the concrete filled steel tube member, the steel block, the steel sheet, force sensor is pressed between the top and the bottom of press from supreme down in proper order, it is fixed in the press bottom through the magnetic base to go up displacement sensor, go up displacement sensor's axial and arrange and its measuring end butt in the part of the non-with steel block contact of steel sheet bottom surface along the direction of height. The utility model discloses can realize the bonding strength survey of reinforced concrete component under the loading effect, simple structure, convenient operation, the result is accurate.

Description

A Measuring Device for Interface Bonding Strength of Steel Tube Concrete Members

technical field

The utility model relates to the technical field of component interface bonding strength, in particular to the measurement of the interface bonding strength of steel tube concrete components, in particular to a measuring device for the interface bonding strength of steel tube concrete components.

Background technique

In actual working conditions, steel pipes and concrete in CFST members are often in different loading states, and there will be transmission between steel pipes and concrete interfaces, especially at structural discontinuities such as nodes and column ends. Therefore, CFST members The bonding performance of the interface is particularly important. How to measure the bonding strength of the component interface has become an important research topic in the industry, and has important guiding value for the design of CFST components.

Contents of the invention

In order to solve the problem of how to measure the interface bonding strength of steel tube concrete components, the utility model provides a measuring device for the interface bonding strength of steel tube concrete components.

The utility model is realized by adopting the following technical scheme: a measuring device for the interface bonding strength of a steel tube concrete member, including a press, a steel tube concrete member, a steel block, a force sensor, and at least one upper displacement sensor, and the steel tube concrete member includes a steel pipe and Concrete, the bottom of the concrete is higher than the bottom end of the steel pipe (to ensure that the concrete has a downward pressure). On the upper part of the concrete (it is well known to those skilled in the art that this kind of push-out test is to be done, the purpose is to make the concrete move relative to the steel pipe, so as to observe the displacement, so the steel block is only pressed on the upper part of the concrete, not the upper part of the steel pipe), the surface area of the steel plate Larger than the cross-sectional area of the steel pipe, the upper displacement sensor is fixed on the bottom of the press through a magnetic base, the axial direction of the upper displacement sensor is arranged along the height direction, and its measuring end abuts against the part of the bottom surface of the steel plate that is not in contact with the steel block.

When in use, push out the concrete through the device, measure the bonding strength-relative slip curve (the curve of stress and displacement) through the force sensor and the upper displacement sensor, and then analyze the bonding strength-relative slip curve , to obtain the bonding performance between the steel tube and concrete in the steel tube concrete member.

Further, the measuring device also includes two lower displacement sensors, a steel sheet, a steel bar, and two supporting platforms respectively located at the left and right ends of the bottom of the CFST member and used to support the CFST member, and the steel sheet is pasted on the bottom of the concrete The steel bar is located below the steel sheet and is vertically fixedly connected to the steel sheet through a vertical connector. The steel bar is arranged radially along the steel pipe and its two ends are exposed to the steel pipe to form the first exposed end and the second exposed end respectively. The measuring ends of the two lower displacement sensors abut against the first exposed end and the second exposed end respectively, and the two lower displacement sensors are fixedly connected to the supporting platform through the magnetic base. With the upper displacement sensor alone, the displacement data is relatively limited. In order to increase the measurement accuracy, the lower displacement sensor is added, and the average value of the upper displacement sensor and the lower displacement sensor is taken as the final displacement measurement data, and the steel bar and steel sheet structure The problem of installing the lower displacement sensor is also solved, and the structure is simple and the concept is ingenious.

The beneficial effects produced by the utility model are as follows: the utility model can realize the measurement of the bonding strength of reinforced concrete components under load, and has a simple structure, convenient operation and accurate results.

Description of drawings

Fig. 1 is the overall structural representation of the utility model;

Fig. 2 is a schematic diagram of the structure at A in Fig. 1;

Fig. 3 is a bottom view of Fig. 2 after being assembled with the steel tube concrete member.

In the figure: 1—steel pipe, 2—concrete, 3—steel block, 4—steel plate, 5—force sensor, 6—upper displacement sensor, 7—lower displacement sensor, 8—steel bar, 9—steel sheet, 10—support Platform, 11—bolt, 12—strain gauge.

Detailed ways

As shown in Figure 1, a measuring device for the interface bonding strength of steel pipe concrete members, including a press, steel pipe concrete members, a steel block 3, a force sensor 5, and two upper displacement sensors 6, the steel pipe concrete members include steel pipe 1 and concrete 2. The bottom of the concrete 2 is higher than the bottom end of the steel pipe 1. The steel pipe concrete member, steel block 3, steel plate 4, and force sensor 5 are pressed between the top and bottom of the press in sequence from bottom to top, and the steel block 3 is pressed on the concrete. 2 The upper part is to ensure the effective loading of the push-out load. The surface area of the steel plate 4 is larger than the cross-sectional area of the steel pipe 1. The two upper displacement sensors 6 are fixed on the bottom of the press through a magnetic base. The axial direction of the two upper displacement sensors 6 is along the height direction It is arranged and its measuring end abuts against the part of the bottom surface of the steel plate 4 that is not in contact with the steel block 3 .

When in use, the device is used to push out the concrete 2, and the bonding strength-relative slip curve (curve of stress and displacement) is measured by the force sensor 5 and the upper displacement sensor 6, and then the bond strength-relative slip curve The curve is analyzed to obtain the bonding performance between the steel pipe 1 and the concrete 2 in the CFST member.

During specific implementation, as shown in Figures 1 to 3, the measuring device also includes two lower displacement sensors 7, a steel sheet 9 and a steel bar 8, which are respectively located at the left and right ends of the bottom of the steel tube concrete member and are used for supporting (holding up) ) The two support platforms 10 of the steel tube concrete member, the steel sheet 9 is pasted on the center of the bottom of the concrete 2, the steel bar 8 is located below the steel sheet 9 and is vertically fixedly connected with the steel sheet 9 through a vertical connector, the steel bar 8 is arranged along the radial direction of the steel pipe 1 and its two ends are exposed to the steel pipe 1 to form a first exposed end and a second exposed end respectively, and the measurement ends of the two lower displacement sensors 7 are respectively abutted against the first exposed end and the second exposed end And the two lower displacement sensors 7 are fixedly connected with the support platform 10 through the magnetic base. Only by the upper displacement sensor 6, the displacement data is relatively limited. In order to increase the measurement accuracy, the lower displacement sensor 7 is added, and the average value of the upper displacement sensor 6 and the lower displacement sensor 7 is taken as the final displacement measurement data. 8 and the steel sheet 9 structure have solved the problem of installing the lower displacement sensor 7 again, and the structure is simple and ingenious.

During concrete implementation, vertical connector is bolt 11, and steel bar 8 is provided with bolt 11 holes, and steel sheet 9 is provided with threaded hole, and bolt 11 passes bolt 11 holes and is screwed in nut and then screwed in threaded hole again. This structure is convenient for installation and disassembly.

During specific implementation, the radial distance between the circumferential edge of the steel block 3 and the inner surface of the steel pipe 1 is 10 mm, which further improves the accuracy of the measurement results. The support platform 10 is a channel steel opening downwards, and the structure is common and the cost is low. The steel block 3 is provided with scales arranged along the height direction, so that the push-out test process can be observed in real time. The outer wall of the steel pipe 1 is provided with a plurality of strain gauges 12 equidistantly arranged along the length direction of the steel pipe 1, so that the data of the strain gauges 12 can be obtained conveniently, so as to accurately study the strain of the steel pipe 1.

In this specific embodiment, the steel pipe 1 is cylindrical, the steel block 3 is cylindrical, and the steel sheet 9 is circular. The center of the bottom of the steel sheet 9 and the concrete 2 is bonded with AB glue.

Claims (10)

1. A measuring device for the interface bonding strength of steel-filled steel tube concrete, characterized in that it comprises a press, steel tube concrete components, steel block (3), force sensor (5), at least one upper displacement sensor (6), steel tube concrete The components include steel pipes (1) and concrete (2), the bottom of the concrete (2) is higher than the bottom end of the steel pipe (1), and the steel pipe concrete members, steel blocks (3), steel plates (4), and force sensors (5) The top is pressed between the top and bottom of the press in turn, the steel block (3) is pressed on the upper part of the concrete (2), the surface area of the steel plate (4) is larger than the cross-sectional area of the steel pipe (1), and the upper displacement sensor (6) passes through The magnetic base is fixed on the bottom of the press, the axial direction of the upper displacement sensor (6) is arranged along the height direction and its measuring end abuts against the part of the bottom surface of the steel plate (4) that is not in contact with the steel block (3). 2. The device for measuring the interface bonding strength of steel pipe concrete members according to claim 1, characterized in that there are two upper displacement sensors (6). 3. A measuring device for the interface bonding strength of a steel tube concrete member according to claim 1 or 2, characterized in that it also includes two lower displacement sensors (7), a steel sheet (9), and a steel bar (8) , the two support platforms (10) which are respectively located at the left and right ends of the bottom of the steel pipe concrete member and used to support the steel pipe concrete member, the steel sheet (9) is pasted on the center of the bottom of the concrete (2), and the steel bar (8) is located on the steel The lower part of the sheet (9) and the steel sheet (9) are vertically fixedly connected by vertical connectors, the steel strip (8) is arranged along the radial direction of the steel pipe (1) and its two ends are exposed to the steel pipe (1) respectively to form The first exposed end and the second exposed end, the measurement ends of the two lower displacement sensors (7) are respectively abutted against the first exposed end and the second exposed end, and the two lower displacement sensors (7) pass through the magnetic base and the supporting platform (10) Fixed connection. 4. A measuring device for the interface bonding strength of a steel tube concrete member according to claim 3, characterized in that the vertical connector is a bolt (11), and the steel bar (8) is provided with a bolt (11) hole, The steel sheet (9) is provided with a threaded hole, and the bolt (11) passes through the bolt (11) hole and is screwed on the nut and then screwed on the threaded hole. 5 . The device for measuring the interface bonding strength of steel pipe concrete members according to claim 4 , wherein the radial distance between the circumferential edge of the steel block ( 3 ) and the inner surface of the steel pipe ( 1 ) is 10 mm. 6 . The device for measuring the interface bonding strength of steel pipe concrete members according to claim 5 , characterized in that, the supporting platform ( 10 ) is a channel steel with an opening downward. 7 . 7. The device for measuring the interface bonding strength of steel pipe concrete members according to claim 6, characterized in that the steel block (3) is provided with scales arranged along the height direction. 8. A device for measuring the interface bonding strength of steel pipe concrete members according to claim 7, characterized in that the outer wall of the steel pipe (1) is provided with a plurality of strain gauges arranged equidistantly along the length direction of the steel pipe (1). slices (12). 9. A device for measuring the interface bonding strength of steel pipe concrete members according to claim 8, characterized in that the steel pipe (1) is cylindrical, the steel block (3) is cylindrical, and the steel sheet (9) The shape is round. 10. The device for measuring the interface bonding strength of concrete-filled steel tube members according to claim 9, characterized in that the center of the steel sheet (9) and the bottom of the concrete (2) is bonded with AB glue.

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