CN111307623B - Impact tension-torsion loading experimental device - Google Patents

Abstract

The invention relates to the field of impact dynamics experiments, in particular to an impact tension-torsion loading experiment device which comprises a test bed, wherein a first fixing frame and a second fixing frame are respectively arranged on the test bed, a tension force testing assembly and a torsion force testing assembly are respectively arranged on the first fixing frame and the second fixing frame, a reinforced concrete test piece is further arranged on the test bed through a fixing assembly, rotary rods are rotatably arranged at the lower parts of the first fixing frame and the second fixing frame, a rope wheel is fixedly arranged at the end part of each rotary rod, a second steel wire rope is wound on the rope wheel, and the other end of the second steel wire rope is connected with a drop hammer. The invention can simultaneously complete the test of the drawing force and the torsion force of the concrete reinforcement, ensure the synchronism of loading and improve the test accuracy.

Description

An experimental device for impact tension and torsion loading

technical field

The invention relates to the field of impact dynamics experiment, in particular to an experiment device for impact tension and torsion loading.

Background technique

The bond between the steel bar and the concrete is a complex interaction between the steel bar and the surrounding concrete, and it is the premise for the composite component composed of the two materials to work. Shear stress is defined as bond stress.

The current experimental research on reinforced concrete anchorage bond stress analysis is roughly divided into simple pull-out experiments, dynamic pull-out experiments and impact pull-out experiments, as well as the above-mentioned experiments with confining pressure applied. Pulling force and torsion force testing cannot guarantee the simultaneous synchronization of loading, which affects the accuracy of the test. Therefore, in view of the above status quo, it is urgent to develop an experimental device for impact tension-torsional loading to overcome the deficiencies in current practical applications.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide an experimental device for impact tension and torsion loading, so as to solve the problems raised in the above background art.

To achieve the above purpose, the embodiments of the present invention provide the following technical solutions:

An experimental device for impact pulling and torsion loading, comprising a test bench, on which a first fixing frame and a second fixing frame are respectively installed and fixed, and a pulling-out frame is respectively installed on the first fixing frame and the second fixing frame A force test component and a torsional force test component, the test stand is also installed and fixed with a reinforced concrete test piece through the fixing component, and the reinforced concrete test piece is provided with steel bars, and the lower parts of the first fixing frame and the second fixing frame are rotatably installed There is a rotating rod, the end of the rotating rod is fixed with a rope pulley, the rope pulley is wound with a second wire rope, the other end of the second wire rope is connected with a drop weight, the drop weight is placed on a support plate, and the support plate is installed and fixed On the support legs arranged on the lower side of the test bench, a push-out assembly for pushing the drop weight off the support plate is also installed on the support plate, and after the drop weight drives the rope pulley to rotate, the rotating rod At the same time, the pull-out force test assembly and the torsion force test assembly are respectively driven by the first gear transmission assembly and the second gear transmission assembly to perform pull-out force and torsion-force tests on the steel bars.

Compared with the prior art, the beneficial effects of the embodiments of the present invention are:

The experimental device for impact tensile and torsional loading is used to fix the reinforced concrete specimen on the test bench, and then connect it with the steel bars of the reinforced concrete specimen through the pulling force test component and the torsion force test component, and push the drop weight from the support through the push component. After the plate is pushed off, the drop weight can pull the sheave through the second wire rope under the action of gravity, thereby driving the rotating rod to rotate, and the rotating rod can simultaneously drive the pulling force test through the first gear transmission assembly and the second gear transmission assembly respectively Component and torsional force test component is used to test the pulling force and torsion force of the steel bar, which is easy to use and operate, and ensures the simultaneous synchronization of loading, which is closer to the actual stress state of reinforced concrete, and improves the accuracy of the test.

Description of drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a drum portion in an embodiment of the present invention.

FIG. 3 is a schematic cross-sectional structural diagram of an internally threaded barrel part in an embodiment of the present invention.

In the picture: 1-threaded rod, 2-internal thread cylinder, 3-first fixing frame, 4-first transmission gear, 5-first steel wire rope, 6-first pressure sensor, 7-rotating drum, 8-second Transmission gear, 9-Second fixing frame, 10-Second pressure sensor, 11-Connecting rod, 12-Metal strain gauge sensor, 13-Reinforced concrete specimen, 14-Binding strap, 15-Tube bolt, 16-Rebar, 17-L-shaped fixing plate, 18-fixing bolt, 19-fixing seat, 20-test bench, 21-supporting leg, 22-second driving gear, 23-rotating rod, 24-telescopic cylinder, 25-push plate, 26 -Support plate, 27-Drop weight, 28-First driving gear, 29-Second wire rope, 30-Sheave.

Detailed ways

The technical solution of the present patent will be described in further detail below in conjunction with specific embodiments.

Embodiments of the present patent are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present patent, but should not be construed as a limitation on the present patent.

Example 1

Referring to FIG. 1 , in an embodiment of the present invention, an experimental device for impact tension and torsion loading includes a test bench 20 , on which a first fixing frame 3 and a second fixing frame 9 are respectively installed and fixed. The first fixing frame 3 and the second fixing frame 9 are respectively installed with a pulling force test component and a torsion force test component, and the test stand 20 is also installed and fixed with a reinforced concrete test piece 13 through the fixing component, and the reinforced concrete test piece 13 Reinforcing bars 16 are arranged inside, and a rotating rod 23 is rotatably installed on the lower part of the first fixing frame 3 and the second fixing frame 9, and a rope wheel 30 is installed and fixed on the end of the rotating rod 23, and a second rope wheel 30 is wound around the rope wheel 30. The wire rope 29, the other end of the second wire rope 29 is connected with a drop weight 27, the drop weight 27 is placed on the support plate 26, the support plate 26 is installed and fixed on the support leg 21 provided on the lower side of the test bench 20, the support plate A push-out assembly for pushing the drop weight 27 off the support plate 26 is also installed on the 26, and after the drop weight 27 drives the sheave 30 to rotate, the rotating rod 23 simultaneously passes through the first gear transmission assembly and the first gear transmission assembly. The second gear transmission assembly drives the pull-out force test assembly and the torsion force test assembly respectively to test the pull-out force and torsion force of the steel bar 16 .

In the embodiment of the present invention, the reinforced concrete specimen 13 is fixed on the test bench 20, and then connected to the steel bar 16 of the reinforced concrete specimen 13 through the pull-out force test assembly and the torsion force test assembly, and the falling out of the assembly is pushed out. After the hammer 27 is pushed off from the support plate 26, the falling hammer 27 can pull the sheave 30 through the second wire rope 29 under the action of gravity, thereby driving the rotating rod 23 to rotate, and the rotating rod 23 can simultaneously pass through the first gear transmission assembly and the second wire rope. The two-gear transmission assembly drives the pull-out force test assembly and the torsion force test assembly to test the pull-out force and torsion force of the steel bar 16 respectively. close to improve the accuracy of the test.

Example 2

Please refer to Figures 1-3. The difference between this embodiment and Embodiment 1 is:

In this embodiment, as shown in FIGS. 1 and 3 , the pull-out force testing assembly includes a threaded rod 1 , an internally threaded barrel 2 , a first wire rope 5 and a first pressure sensor 6 , and the internally threaded barrel 2 is rotatably installed On the first fixing frame 3, the inner threaded barrel 2 and the steel bar 16 are coaxially arranged, and the inner thread of the inner threaded barrel 2 is connected with a threaded rod 1. In order to prevent the threaded rod 1 from twisting, the test bench 20 is also installed There is an anti-twist component, that is, to prevent the threaded rod 1 from rotating with the inner threaded barrel 2, and the specific structure can adopt the existing technology. There is a first pressure sensor 6 on the 5, and the first pressure sensor 6 is used to test the pulling force.

In this embodiment, as shown in FIGS. 1 and 2 , the torsion test assembly includes a rotating drum 7 , a second pressure sensor 10 and a connecting rod 11 , and the rotating drum 7 is rotatably mounted on the second fixing frame 9 , The rotating drum 7 and the steel bar 16 are coaxially arranged, and a second pressure sensor 10 is also installed at the connection between the rotating drum 7 and the second fixing frame 9, and the second pressure sensor 10 is used to measure the torsional force. A plurality of connecting rods 11 are installed circumferentially at one end of the rotating drum 7 close to the steel bar 16, and the other ends of the plurality of connecting rods 11 are connected to the end of the steel bar 16 in a corresponding sliding manner, and the plurality of connecting rods 11 can drive the steel bar 16 to twist. In this way, the torsional force test and the pull-out force test can be independent of each other; further, the first wire rope 5 of the pull-out force test assembly passes through the drum 7 , and the first wire rope 5 is connected and fixed in the middle of the end of the steel bar 16 Location.

In this embodiment, the rotating rod 23 is arranged parallel to the inner thread cylinder 2 and the rotating cylinder 7, the first gear transmission assembly includes a first driving gear 28 and a first transmission gear 4, and the second gear transmission assembly includes a The second drive gear 22 and the second drive gear 8, the second drive gear 8 and the first drive gear 4 are of the same model, the second drive gear 22 and the first drive gear 28 are of the same model, and the first drive The gear 4 and the second transmission gear 8 are respectively installed and fixed on the inner thread cylinder 2 and the rotating cylinder 7, the first driving gear 28 and the second driving gear 22 are both installed and fixed on the rotating rod 23, the first transmission gear 4 is meshed with the first driving gear 28, and the second driving gear 22 is meshed with the second transmission gear 8.

In this embodiment, the push-out assembly includes a push plate 25 and a telescopic cylinder 24. The telescopic cylinder 24 is horizontally installed and fixed on the support plate 26, and the end of the piston rod of the telescopic cylinder 24 is installed and fixed with a push plate 25. The push plate 25 is arranged vertically, and the push plate 25 is in sliding connection with the support plate 26 , and the drop weight 27 can be pushed off from the support plate 26 by the operation of the telescopic cylinder 24 .

In this embodiment, the fixing assembly includes a strap 14, a turnbuckle bolt 15, an L-shaped fixing plate 17, a fixing bolt 18 and a fixing seat 19. The fixing seat 19 is installed and fixed on the test bench 20, and the reinforced concrete The test piece 13 is installed and fixed on the fixed seat 19, and the outer side of the reinforced concrete test piece 13 is also installed with a plurality of L-shaped fixing plates 17 distributed in the circumferential direction, and the L-shaped fixing plate 17 is connected to the fixing seat 19 through the fixing bolts 18. For connection and fixation, the vertical part of the L-shaped fixing plate 17 abuts against the reinforced concrete specimen 13, and the L-shaped fixing plate 17 is used to limit and fix the reinforced concrete specimen 13. A plurality of straps 14 are provided, the two ends of the straps 14 are connected and fixed with the fixing base 19, and the straps 14 are installed with flower basket bolts 15. Further bundled fixed effects.

In this embodiment, a metal strain gauge sensor 12 is attached inside the steel bar 16 , and the metal strain gauge sensor 12 is used to measure the stress distribution along the anchorage length of the steel bar 16 .

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, some modifications and improvements can be made without departing from the concept of the present invention, and these should also be regarded as the protection of the present invention. scope, these will not affect the effect of the implementation of the present invention and the practicability of the patent.

Claims (4)

1. The utility model provides an experimental apparatus of impact tension-torsion loading, includes test bench (20), its characterized in that:

a first fixing frame (3) and a second fixing frame (9) are respectively installed and fixed on the test bed (20), and a drawing force testing assembly and a torsion force testing assembly are respectively installed on the first fixing frame (3) and the second fixing frame (9);

a reinforced concrete test piece (13) is also fixedly arranged on the test bed (20) through a fixing component, and a steel bar (16) is arranged in the reinforced concrete test piece (13);

the lower parts of the first fixing frame (3) and the second fixing frame (9) are rotatably provided with a rotating rod (23), the end part of the rotating rod (23) is fixedly provided with a rope wheel (30), a second steel wire rope (29) is wound on the rope wheel (30), the other end of the second steel wire rope (29) is connected with a drop hammer (27), the drop hammer (27) is arranged on a supporting plate (26), the supporting plate (26) is fixedly arranged on a supporting leg (21) arranged at the lower side of the test bed (20), and the supporting plate (26) is further provided with a pushing assembly used for pushing the drop hammer (27) off from the supporting plate (26);

after the drop hammer (27) drives the rope pulley (30) to rotate, the rotating rod (23) simultaneously drives the drawing force testing assembly and the torsion force testing assembly to test the drawing force and the torsion force of the steel bar (16) through the first gear transmission assembly and the second gear transmission assembly respectively;

the drawing force testing assembly comprises a threaded rod (1), an internal thread cylinder (2), a first steel wire rope (5) and a first pressure sensor (6);

the internal thread cylinder (2) is rotatably arranged on the first fixing frame (3), and the internal thread of the internal thread cylinder (2) is connected with the threaded rod (1) in a matching way;

one end, close to the steel bar (16), of the threaded rod (1) is connected with a first steel wire rope (5), a first pressure sensor (6) is arranged on the first steel wire rope (5), and the other end of the first steel wire rope (5) is correspondingly connected and fixed with the end part of the steel bar (16);

the torsional force testing assembly comprises a rotary drum (7), a second pressure sensor (10) and a connecting rod (11);

the rotary drum (7) is rotatably arranged on a second fixed frame (9), and a second pressure sensor (10) is further arranged at the joint of the rotary drum (7) and the second fixed frame (9);

a plurality of connecting rods (11) are circumferentially distributed and mounted at one end of the rotary drum (7) close to the steel bars (16), and the other ends of the connecting rods (11) are correspondingly matched and slidably connected with the end parts of the steel bars (16);

the rotary drum (7) and the reinforcing steel bars (16) are coaxially arranged;

a first steel wire rope (5) of the drawing force testing assembly penetrates through the rotary drum (7), and the first steel wire rope (5) is fixedly connected to the middle position of the end part of the steel bar (16);

the rotating rod (23) is arranged in parallel to the internal thread cylinder (2) and the rotating cylinder (7);

the first gear transmission assembly comprises a first driving gear (28) and a first transmission gear (4), and the second gear transmission assembly comprises a second driving gear (22) and a second transmission gear (8);

the second transmission gear (8) and the first transmission gear (4) are the same in model, and the second driving gear (22) and the first driving gear (28) are the same in model;

the first transmission gear (4) and the second transmission gear (8) are respectively installed and fixed on the internal thread drum (2) and the rotary drum (7), and the first driving gear (28) and the second driving gear (22) are both installed and fixed on the rotary rod (23);

the first transmission gear (4) is meshed with the first driving gear (28), and the second driving gear (22) is meshed with the second transmission gear (8).

2. The experimental device for impact tension-torsion loading according to claim 1, wherein the internally threaded cylinder (2) is coaxially arranged with a steel bar (16);

and the test bed (20) is also provided with an anti-torsion assembly.

3. The experimental device for impact tension-torsion loading according to claim 1, wherein the push-out assembly comprises a push plate (25) and a telescopic cylinder (24);

the telescopic cylinder (24) is horizontally arranged and fixed on the supporting plate (26), and the end part of a piston rod of the telescopic cylinder (24) is fixedly provided with a push plate (25);

the push plate (25) is vertically arranged, and the push plate (25) is in sliding connection with the support plate (26) in a matched mode.

4. The impact tension-torsion loading experimental device as claimed in claim 1 or 3, wherein the fixing assembly comprises a binding band (14), a turn buckle (15), an L-shaped fixing plate (17), a fixing bolt (18) and a fixing seat (19);

the fixed seat (19) is fixedly arranged on the test bed (20), and the reinforced concrete test piece (13) is fixedly arranged on the fixed seat (19);

a plurality of L-shaped fixing plates (17) are further circumferentially distributed and mounted on the outer side of the reinforced concrete test piece (13), the L-shaped fixing plates (17) are fixedly connected with a fixing seat (19) through fixing bolts (18), and the vertical parts of the L-shaped fixing plates (17) are abutted against the reinforced concrete test piece (13);

the reinforced concrete test piece (13) is further provided with a plurality of binding bands (14), two ends of each binding band (14) are fixedly connected with the fixing seats (19), and the binding bands (14) are provided with turn-buckle bolts (15).

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