A beam-type steel-concrete beam bond-slip performance test device

Abstract

The present invention relates to the technical field of bond-slip performance test of reinforced concrete beams, and in particular to a bond-slip performance test device for beam-type reinforced concrete beams, comprising a transversely arranged concrete beam, a steel beam and a distribution beam, wherein the top surfaces of the concrete beam and the steel beam are located in the same plane, and the tops of the two are hinged by steel hinges, the bottoms of the concrete beam and the steel beam are both provided with supports, and the two loading beams provided at the bottom of the distribution beam are symmetrically arranged on both sides of the steel hinge axis. The present invention provides a rolling ball that can be universally adjusted inside a spherical chamber, and as long as the offset of the test steel bar is within the adjustable range of the rolling ball, the axial force on the connecting bar can be evenly and accurately measured by an annular pressure sensor, thereby minimizing the measurement error; improving the accuracy of the axial force measurement, facilitating calibration with the sensor on the distribution beam, and facilitating verification and improving the accuracy of the test data.

Description

Technical Field

[0001] The invention relates to the technical field of bonding-slip performance testing of a steel bar-concrete beam, in particular to a bonding-slip performance testing device of a beam-type steel bar-concrete beam. Background Art

[0002] The bonding performance between steel bars and concrete is the premise for the joint work of the two, which is particularly important for the safety and reliability of concrete structures. The structure maintains sufficient bond strength and transfers the load to the steel bars, which can improve the ability of steel bars and concrete to work together. The test methods for the bond performance between steel bars and concrete mainly include center pullout test and beam test. Compared with the center pullout test, the beam test is subjected to bending moment and shear force at the same time during the stress process, which conforms to the actual working conditions. The calculation of the steel bar bond strength is more complicated, and the traditional beam component cannot measure the axial force of the steel bar during the test. The bond stress needs to be indirectly calculated through the strain gauge embedded in the steel bar.

[0003] At present, in the research test of beam bond slip, the invention patent (201310162566X) designs FRP bars to replace steel bars as the tensile bars at the bottom of the beam, and uses steel plates to completely fix the FRP bars, which is consistent with the actual stress state of the structure and effectively eliminates the initial test geometric eccentricity, ensuring that the applied tension is an axial tensile load. However, this technical solution cannot directly and accurately measure the axial force of the test steel bar (i.e. the above-mentioned FRP bar) in actual use, which makes it impossible to calibrate with the sensor on the distribution beam, and it is impossible to verify and improve the accuracy of the test data. Summary of the invention

[0004] The purpose of the present invention is to provide a bonding and slip performance testing device for a beam-type steel bar-concrete beam to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A beam-type steel bar-concrete beam bonding slip performance test device comprises a transversely arranged concrete beam, a steel beam and a distribution beam, wherein the top surfaces of the concrete beam and the steel beam are located in the same plane, and the tops of the two are hinged by a steel hinge, the bottoms of the concrete beam and the steel beam are both provided with supports, two loading beams arranged at the bottom of the distribution beam are symmetrically arranged on both sides of the steel hinge axis, and the two loading beams are respectively arranged at the tops of the concrete beam and the steel beam, the distribution beam is used to cooperate with a pressure device to apply downward pressure to the concrete beam and the steel beam, a transverse test steel bar is arranged inside the concrete beam, a transverse connecting bar is arranged on the steel beam, and one end of the connecting bar is fixedly connected to the loading end of the test steel bar;

[0007] The free end and the loading end of the test steel bar are respectively provided with a first displacement meter and a second displacement meter;

[0008] An outer shell is provided at one end of the steel beam close to the concrete beam, a spherical chamber with openings at both ends is formed inside the outer shell, and a rolling ball is universally connected inside the spherical chamber;

[0009] A through hole is formed on the rolling ball, and the center of the rolling ball is located on the axis of the through hole;

[0010] The connecting rib coaxially passes through the through hole, and an annular pressure sensor is fixedly arranged on the other end of the connecting rib, and the annular pressure sensor is pressed against the rolling ball.

[0011] Preferably, a gap is left between the inner surface of the spherical chamber and the outer surface of the rolling ball, a plurality of first universal balls are arranged in the gap, and the first universal balls are threadedly fixed on the inner surface of the spherical chamber.

[0012] Preferably, the housing comprises an upper and lower half shell, each half shell is fixed with a connecting block, and the connecting block on the upper half shell is fixedly connected to the corresponding connecting block on the lower half shell by means of a hexagon socket bolt.

[0013] Preferably, the rolling ball includes two left and right hemispheres, one of which is fixed with an external threaded barrel coaxially arranged with the through hole, and the other hemisphere is provided with an annular threaded groove coaxially arranged with the through hole, and the external threaded barrel is threadedly connected to the inside of the annular threaded groove.

[0014] Preferably, an annular groove is formed on the inner circumference of the through hole on the hemisphere, a liner is inserted into the annular groove, a plurality of second universal balls are fixed to the inner circumference of the liner, and the ball heads of the second universal balls are in rolling contact with the outer circumference of the connecting rib; the liner includes two upper and lower half tubes.

[0015] Preferably, the outer surface of the liner is provided with an axially extending positioning key, and the inner surface of the annular groove is provided with a keyway matching the positioning key.

[0016] Preferably, the connecting rib comprises an optical axis and a first screw rod and a second screw rod coaxially fixed at two ends of the optical axis respectively;

[0017] The loading end of the test steel bar is sleeved and fixed with a sleeve;

[0018] The first screw is threadedly connected to the interior of the sleeve;

[0019] A nut is threadedly connected to the second screw rod, and the nut presses the annular pressure sensor against the rolling ball.

[0020] Preferably, gaskets fixed to the rolling ball are provided at both ends of the through hole, and the gaskets are coaxially arranged with the through hole.

[0021] Preferably, a fixing plate is fixed to one end of the steel beam close to the concrete beam, and the fixing plate includes a lower plate and an upper plate and a receiving space formed therebetween;

[0022] The upper and lower ends of the housing are rotatably connected with pins through bearing seats, and the two pins are fixedly connected to the lower plate and the upper plate respectively;

[0023] There are six connection blocks on each half shell, which are symmetrically arranged on both sides of the half shell, and a plug-in channel is formed between two adjacent connection blocks on the same side;

[0024] The positioning card plate is inserted into the interior of the insertion channel, and the upper and lower ends of the positioning card plate are in contact with the lower plate and the upper plate respectively;

[0025] Limit blocks are fixed on both the left and right sides of the positioning clamping plate, and the limit blocks are clamped between the bolt head of the hexagon socket bolt and the outer surface of the housing;

[0026] Two positioning clamps are provided and are symmetrically arranged on the front and rear sides of the shell, and the two positioning clamps are symmetrically distributed on the left and right sides of the fixing plate.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention provides a rolling ball that can be universally adjusted inside the spherical chamber. As long as the offset of the test steel bar is within the adjustable range of the rolling ball, the axial force on the connecting bar can be evenly and accurately measured by the annular pressure sensor, thereby reducing the measurement error to the greatest extent; the accuracy of the axial force measurement is improved, which is convenient for calibration with the sensor on the distribution beam, and is beneficial to verifying and improving the accuracy of the test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall front view structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0031] Figure 3 It is a schematic diagram of a partial three-dimensional structure of the present invention;

[0032] Figure 4 For the present invention Figure 3 A schematic diagram of a top view structure;

[0033] Figure 5 For the present invention Figure 3 Schematic diagram of the local structure;

[0034] Figure 6 It is a schematic diagram of the top view of the half shell and the rolling ball of the present invention;

[0035] Figure 7 It is a schematic diagram of a top view of the cross-sectional structure of the half shell and the ball of the present invention;

[0036] Figure 8It is a right side structural schematic diagram of the hemispherical body and the liner of the present invention;

[0037] Fig. 9 It is a right side structural schematic diagram of the liner pipe of the present invention;

[0038] Fig.10 It is a schematic diagram of the three-dimensional structure of the housing and the rolling ball of the present invention;

[0039] Fig.11 For the present invention Fig.10 The enlarged structural diagram at A in the middle;

[0040] Fig.12 It is a schematic diagram of the side structure of the fixing plate of the present invention.

[0041] In the figure: 1, concrete beam; 2, steel beam; 201, rib plate; 3, distribution beam; 4, steel hinge; 5, test steel bar; 6, connecting bar; 601, optical axis; 602, first screw; 603, second screw; 7, support; 8, first displacement meter; 9, second displacement meter; 10, vertical rod; 11, loading beam; 12, sleeve; 13, shell; 1301, half shell; 1302, connecting block; 1303, hexagon socket bolt; 14, rolling ball; 1401, hemisphere; 1402, through hole; 1403, external threaded barrel; 1404, annular thread groove; 1405, annular groove; 1406, keyway; 15, fixing plate; 1501, lower plate; 1502, upper plate; 16, annular pressure sensor; 17, nut; 18, first universal ball; 19, gasket; 20, liner; 2001, half pipe; 2002, positioning key; 21, second universal ball; 22, pin shaft; 23, bearing seat; 24, positioning clamp; 2401, limit block. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] See also Figure 1-Figure 12 , the present invention provides a technical solution:

[0044] A beam-type steel-concrete beam bond-slip performance test device comprises a transversely arranged concrete beam 1, a steel beam 2 and a distribution beam 3, wherein the concrete beam 1 is composed of concrete and a steel cage; the steel beam 2 comprises a U-shaped steel plate with openings at the left and right ends and the top end and a plurality of rib plates 201 welded and fixed inside the U-shaped steel plate; the distribution beam 3 is used to distribute the downward pressure acting on the concrete beam 1 and the steel beam 2. The specific arrangement of the concrete beam 1, the steel beam 2 and the distribution beam 3 and their relative positions are as follows Figure 1 and Figure 2 As shown, specifically, the top surfaces of the concrete beam 1 and the steel beam 2 are located in the same plane, and the tops of the two are hinged by a steel hinge 4, and the bottoms of the concrete beam 1 and the steel beam 2 are both provided with a support 7 (such as Figure 1 As shown in the figure, the two loading beams 11 arranged at the bottom of the distribution beam 3 are symmetrically arranged on both sides of the axis of the steel hinge 4 (the axis of the steel hinge 4 refers to the axis of the hinge shaft of the steel hinge 4), and the two loading beams 11 are respectively arranged on the top of the concrete beam 1 and the steel beam 2. The distribution beam 3 is used to cooperate with the pressure equipment (the pressure equipment here can be a hydraulic cylinder, etc., the pressure equipment pushes the distribution beam 3 to generate a downward force, and then distributes it to the concrete beam 1 and the steel beam 2 through the two loading beams 11) to apply downward pressure to the concrete beam 1 and the steel beam 2. A transverse test steel bar 5 is arranged inside the concrete beam 1, and a strain gauge is attached to the slot of the test steel bar 5 to measure the strain value of the test steel bar 5 by using the strain gauge, so as to obtain the local bonding stress; a transverse connecting bar 6 is arranged on the steel beam 2, and one end of the connecting bar 6 is fixedly connected to the loading end of the test steel bar 5.

[0045] The free end and the loading end of the test steel bar 5 are respectively provided with a first displacement meter 8 and a second displacement meter 9. Specifically, the first displacement meter 8 is used to measure the displacement of the free end of the test steel bar 5 during the test, and the second displacement meter 9 is used to measure the displacement of the loading end of the test steel bar 5 during the test, so as to avoid reducing the accuracy of the test result due to the elongation of the test steel bar 5 itself. Furthermore, a vertical rod 10 is welded to the loading end of the test steel bar 5, and the axis of the vertical rod 10 is perpendicular to the axis of the test steel bar 5. The second displacement meter 9 obtains the displacement of the loading end of the test steel bar 5 during the test by measuring the displacement of the vertical rod 10.

[0046] An outer shell 13 is provided at one end of the steel beam 2 close to the concrete beam 1. The outer shell 13 is cylindrical as a whole. A spherical chamber with openings at both ends is formed inside the outer shell 13. A ball 14 is universally connected inside the spherical chamber. The universally connected ball 14 here means that the position of the ball 14 can be adjusted in various directions inside the spherical chamber, which will be described in detail below.

[0047] The rolling ball 14 is provided with a through hole 1402, and the center of the rolling ball 14 is located on the axis of the through hole 1402; the connecting rib 6 coaxially passes through the through hole 1402, and the other end of the connecting rib 6 is fixedly provided with an annular pressure sensor 16, which is pressed against the rolling ball 14. The two ends of the through hole 1402 are both provided with gaskets 19 fixed to the rolling ball 14, and the gaskets 19 are coaxially arranged with the through hole 1402. The gaskets 19 allow the rolling ball 14 to further make uniform and comprehensive contact with the annular pressure sensor 16, while reducing the pressure between the rolling ball 14 and the annular pressure sensor 16, thereby extending the service life of the annular pressure sensor 16.

[0048] The working principle of the above technical solution is: since the connecting rib 6 can always remain coaxial with the through hole 1402, no matter whether the connecting rib 6 is offset or bent, after the adaptive adjustment of the rolling ball 14, the rolling ball 14 can make uniform contact with the annular pressure sensor 16; when the downward pressure on the distribution beam 3 acts on the concrete beam 1 and the steel beam 2, the connecting rib 6 may bend. At this time, the annular pressure sensor 16 can be used to detect the force exerted by the rolling ball 14 on it, which is the axial force of the connecting rib 6.

[0049] Therefore, the above-mentioned internal universal connection with the ball 14 in the spherical chamber means that the connecting rib 6 can be adjusted in various directions under the action of the ball 14, and its adjustment range is: the range of rotating along the annular edge of the opening at both ends of the spherical chamber after the connecting rib 6 is attached to the annular edge position of the spherical chamber; the advantage of such a setting is that: since the connecting rib 6 and the test steel bar 5 need to remain coaxial, once the position of the test steel bar 5 is offset during the production process of the concrete beam 1, the connecting rib 6 and the test steel bar 5 will also be offset after being fixedly connected. At this time, when the axial force of the connecting rib 6 and the test steel bar 5 is directly measured by the annular pressure sensor 16, a deviation will occur, resulting in inaccurate axial force measurement results. However, by setting the ball 14 that can be universally adjusted inside the spherical chamber, only To test the offset of the steel bar 5 within the adjustable range of the rolling ball 14, the axial force on the connecting bar 6 can be evenly and accurately measured by the annular pressure sensor 16, thereby minimizing the measurement error; further, even if the test steel bar 5 does not deviate during the production process of the concrete beam 1, during the actual test, the downward pressure exerted by the distribution beam 3 will cause the test steel bar 5 and the connecting bar 6 to bend and deform. At this time, due to the setting of the outer shell 13 and the rolling ball 14, the connecting bar 6 can always remain coaxial with the through hole 1402, and the axial force on the connecting bar 6 can be evenly and accurately measured by the annular pressure sensor 16, thereby improving the accuracy of the axial force measurement, facilitating calibration with the sensor on the distribution beam, and facilitating verification and improving the accuracy of the test data.

[0050] like Figure 6 and Figure 7 As shown, a gap is left between the inner surface of the spherical chamber and the outer surface of the rolling ball 14, and a plurality of first universal balls 18 are arranged in the gap. The first universal balls 18 are threadedly fixed to the inner surface of the spherical chamber. Since the first universal balls 18 are fixedly connected to the inner surface of the spherical chamber, it is convenient to replace the first universal balls 18 when they fail, and the ball heads of the plurality of first universal balls 18 are in rolling contact with the spherical surface of the rolling ball 14, so the friction between the rolling ball 14 and the inner surface of the spherical chamber can be reduced, thereby reducing wear.

[0051] The outer shell 13 includes two upper and lower half shells 1301, and a connecting block 1302 is fixed on each half shell 1301. The connecting block 1302 on the upper half shell 1301 is fixedly connected to the corresponding connecting block 1302 on the lower half shell 1301 by means of hexagon socket bolts 1303. By dividing the outer shell 13 into two upper and lower half shells 1301, and then assembling and fixing the two half shells 1301 by means of hexagon socket bolts 1303, the rolling ball 14 can be quickly installed and disassembled, and it is also convenient to replace the damaged first universal ball 18.

[0052] The rolling ball 14 includes two left and right hemispheres 1401, one of which is fixed with an external threaded barrel 1403 coaxially arranged with the through hole 1402, and the other hemisphere 1401 is provided with an annular threaded groove 1404 coaxially arranged with the through hole 1402, and the external threaded barrel 1403 is threadedly connected inside the annular threaded groove 1404. By arranging the rolling ball 14 as two left and right hemispheres 1401, it is convenient for the installation and removal of the liner 20 and other structures below. The outer surface of the liner 20 is provided with an axially extending positioning key 2002, and the inner surface of the annular groove 1405 is provided with a keyway 1406 matching the positioning key 2002. The positioning key 2002 cooperates with the keyway 1406 to prevent the liner 20 from rotating around its own axis, thereby improving the stability of the liner 20.

[0053] An annular groove 1405 is formed on the inner circumference of the through hole 1402 on the hemispherical body 1401, and a liner 20 is inserted into the annular groove 1405. A plurality of second universal balls 21 are fixed to the inner circumference of the liner 20. As shown in the figure, the plurality of second universal balls 21 can be evenly divided into three groups. Each group of second universal balls 21 is equidistantly arranged in a direction parallel to the axial direction of the liner 20. The ball head of the second universal ball 21 is in rolling contact with the outer circumference of the connecting rib 6. Through the arrangement of the second universal ball 21, the connecting rib 6 and the through hole 1402 can always be kept in a coaxial state, which is conducive to the accurate measurement of the axial force of the connecting rib 6. The liner 20 includes two upper and lower half tubes 2001, which facilitates the installation and disassembly of the second universal ball 21.

[0054] The connecting rib 6 includes an optical axis 601 and a first screw rod 602 and a second screw rod 603 coaxially fixed at both ends of the optical axis 601; the loading end of the test steel bar 5 is sleeved and fixed with a sleeve 12, and the top of the vertical rod 10 is spot welded to the sleeve 12; the first screw rod 602 is threadedly connected to the inside of the sleeve 12; the second screw rod 603 is threadedly connected with a nut 17, and the nut 17 presses the annular pressure sensor 16 against the ball 14, so that the nut 17 can be used to limit the position of the annular pressure sensor 16 to prevent the annular pressure sensor 16 from moving right, ensuring that all the forces acting on the annular pressure sensor 16 by the ball 14 can be measured by the annular pressure sensor 16, thereby improving the accuracy of the detection result.

[0055] In order to further extend the service life of the first universal ball 18, a fixing plate 15 is fixed to the end of the steel beam 2 close to the concrete beam 1, and the fixing plate 15 includes a lower plate 1501 and an upper plate 1502 and a receiving space formed therebetween; the upper and lower ends of the shell 13 are rotatably connected with pins 22 through a bearing seat 23, and the two pins 22 are fixedly connected to the lower plate 1501 and the upper plate 1502 respectively, so that the shell 13 and the ball 14 can rotate around the axis of the pin 22, thereby changing the left and right positions of the shell 13 and the ball 14. For example, the shell 13 can be rotated to transform the end of the shell 13 originally close to the concrete beam 1 to the end away from the concrete beam 1, so that the first universal balls 18 originally located on the left and right sides of the spherical chamber (the first universal balls 18 on the left and right sides refer to: Figure 6 and Figure 7 As shown, the joint of the two hemispheres 1401 is the first universal balls 18 on the left and right sides divided by the center dividing line. This prevents the first universal ball 18 on the right side from being damaged by long-term stress, thereby extending the service life of the first universal ball 18, reducing the probability of replacing the first universal ball 18, and saving costs.

[0056] Six connecting blocks 1302 are provided on each half shell 1301, and are symmetrically arranged on both sides of the half shell 1301, and a plug-in channel is formed between two adjacent connecting blocks 1302 on the same side; the positioning card plate 24 is plugged into the inside of the plug-in channel, and the upper and lower ends of the positioning card plate 24 are respectively in contact with the lower plate 1501 and the upper plate 1502; the left and right sides of the positioning card plate 24 are fixed with limit blocks 2401, and the limit blocks 2401 are clamped between the bolt head of the hexagon socket bolt 1303 and the outer surface of the shell 13; there are two positioning card plates 24, and It is symmetrically arranged on the front and rear sides of the shell 13, and the two positioning clamps 24 are symmetrically distributed on the left and right sides of the fixing plate 15; the positioning clamps 24 use the two connecting blocks 1302 on the left and right sides of the plug-in channel to limit the left and right directions, and then use the bolt head of the hexagon socket bolt 1303 and the outer surface of the shell 13 to limit the front and rear directions, and finally use its own gravity and the steel beam 2 to achieve the limit in the up and down directions, ensuring that the two positioning clamps 24 can fix the position of the shell 13. The overall structure is simple, no special fixing structure is required, and the manufacturing cost is low.

[0057] The present invention measures the axial force of the test steel bar 5 through the annular pressure sensor 16, and checks it with the load on the upper part of the distribution beam 3. At the same time, the relative displacement between the test steel bar 5 and the concrete beam 1 is obtained through the first displacement meter 8 and the second displacement meter 9, so as to obtain a more accurate steel bar-concrete bond slip relationship.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A beam-type steel-concrete beam bond-slip performance test device, comprising a transversely arranged concrete beam, a steel beam and a distribution beam, wherein: The top surfaces of the concrete beam and the steel beam are located in the same plane, and the tops of the two are hinged by steel hinges. The bottoms of the concrete beam and the steel beam are both provided with supports. The two loading beams provided at the bottom of the distribution beam are symmetrically arranged on both sides of the steel hinge axis, and the two loading beams are respectively arranged at the tops of the concrete beam and the steel beam. The distribution beam is used to cooperate with the pressure equipment to apply downward pressure to the concrete beam and the steel beam. The interior of the concrete beam is provided with transverse test steel bars, and the steel beam is provided with transverse connecting bars. One end of the connecting bar is fixedly connected to the loading end of the test steel bar. It is characterized in that: The free end and the loading end of the test steel bar are respectively provided with a first displacement meter and a second displacement meter; An outer shell is provided at one end of the steel beam close to the concrete beam, a spherical chamber with openings at both ends is formed inside the outer shell, and a rolling ball is universally connected inside the spherical chamber; A through hole is formed on the rolling ball, and the center of the rolling ball is located on the axis of the through hole; The connecting rib coaxially passes through the through hole, and an annular pressure sensor is fixedly arranged on the other end of the connecting rib, and the annular pressure sensor is pressed against the rolling ball.

2. The bonding and slip performance testing device for a beam-type steel bar-concrete beam according to claim 1 is characterized in that: A gap is left between the inner surface of the spherical chamber and the outer surface of the rolling ball, a plurality of first universal balls are arranged in the gap, and the first universal balls are threadedly fixed on the inner surface of the spherical chamber.

3. The bonding and slip performance testing device of a beam-type steel bar-concrete beam according to claim 1 is characterized in that: The shell comprises an upper and lower half shell, each half shell is fixed with a connecting block, and the connecting block on the upper half shell is fixedly connected with the corresponding connecting block on the lower half shell by means of hexagon socket bolts.

4. The bonding and slip performance testing device for a beam-type steel bar-concrete beam according to claim 1, characterized in that: The rolling ball comprises two left and right hemispheres, one of which is fixed with an external threaded barrel coaxially arranged with the through hole, and the other is provided with an annular threaded groove coaxially arranged with the through hole, and the external threaded barrel is threadedly connected inside the annular threaded groove.

5. The bonding and slip performance testing device of a beam-type steel bar-concrete beam according to claim 4 is characterized in that: An annular groove is formed on the inner circumference of the through hole on the hemisphere, a liner is inserted into the annular groove, a plurality of second universal balls are fixed on the inner circumference of the liner, and the ball heads of the second universal balls are in rolling contact with the outer circumference of the connecting rib; the liner includes two upper and lower half tubes.

6. The bonding and slip performance testing device for a beam-type steel bar-concrete beam according to claim 5, characterized in that: The outer surface of the liner is provided with an axially extending positioning key, and the inner surface of the annular groove is provided with a keyway matching the positioning key.

7. The bonding and slip performance testing device for a beam-type steel bar-concrete beam according to claim 1, characterized in that: The connecting rib includes an optical axis and a first screw rod and a second screw rod coaxially fixed at two ends of the optical axis respectively; The loading end of the test steel bar is sleeved and fixed with a sleeve; The first screw is threadedly connected to the interior of the sleeve; A nut is threadedly connected to the second screw rod, and the nut presses the annular pressure sensor against the rolling ball.

8. The bonding and slip performance testing device for a beam-type steel bar-concrete beam according to claim 1, characterized in that: Gaskets fixed to the rolling ball are arranged at the two end positions of the through hole, and the gaskets are arranged coaxially with the through hole.

9. The bonding and slip performance testing device for a beam-type steel bar-concrete beam according to claim 3, characterized in that: A fixing plate is fixed to one end of the steel beam close to the concrete beam, and the fixing plate includes a lower plate and an upper plate and a receiving space formed therebetween; The upper and lower ends of the housing are rotatably connected with pins through bearing seats, and the two pins are fixedly connected to the lower plate and the upper plate respectively; There are six connection blocks on each half shell, which are symmetrically arranged on both sides of the half shell, and a plug-in channel is formed between two adjacent connection blocks on the same side; The positioning card plate is inserted into the interior of the insertion channel, and the upper and lower ends of the positioning card plate are in contact with the lower plate and the upper plate respectively; Limit blocks are fixed on both the left and right sides of the positioning clamping plate, and the limit blocks are clamped between the bolt head of the hexagon socket bolt and the outer surface of the housing; Two positioning clamps are provided and are symmetrically arranged on the front and rear sides of the shell, and the two positioning clamps are symmetrically distributed on the left and right sides of the fixing plate.

Images