Local anti-shearing test device for steel inner core-UHPC combined bridge and use method of local anti-shearing test device

Abstract

The invention discloses a steel inner core-UHPC combined bridge local anti-shear test device and a use method, and relates to the technical field of combined bridge anti-shear tests.The steel inner core-UHPC combined bridge local anti-shear test device comprises a base, supporting assemblies are symmetrically arranged above the base in a sliding mode, and the supporting assemblies are driven by a first driving motor; the side loading components are symmetrically arranged on the base in a sliding manner and are driven by a driving motor II; the lower loading assembly is arranged on the base in a sliding manner and is driven by a driving motor III; the first driving motors, the second driving motors and the third driving motors are all fixed in the base, and the two first driving motors and the two second driving motors control the two supporting assemblies and the side loading assembly respectively. According to the interface shear performance testing device, loading force can be accurately focused on a joint area, the weakest interface shear performance can be directly tested, and the testing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of shear resistance tests for composite bridges, and specifically to a local shear resistance test device and method for a steel core-UHPC composite bridge. Background Art

[0002] Shear strength, also known as shear resistance, is the ultimate strength generated when a material is sheared, reflecting the material's ability to resist shear sliding. Numerically, it is equal to the tangential stress value on the shear plane, that is, the ratio of the shear force formed on the shear plane to the failure area.

[0003] Existing shear resistance test devices use universal shear testing machines. When working, they detect by applying a downward pressure to the test position of the composite bridge. The detection mode is single, and when pressing down, the composite bridge will tend to bend at the pressing position. At this time, the test position of the composite bridge will be subjected to forces in multiple directions, thus affecting the shear force test and resulting in inaccurate results. Moreover, when testing the joint of the composite bridge, the overall length of the composite bridge causes the shear force to be not concentrated, resulting in inaccurate test results for the joint.

[0004] In view of the above problems, the present invention provides a local shear resistance test device and method for a steel core-UHPC composite bridge to solve the above problems. Summary of the Invention

[0005] To achieve the above object, the present invention provides the following technical solution: A local shear resistance test device for a steel core-UHPC composite bridge, comprising:

[0006] A base, on which a support assembly is symmetrically and slidably arranged, and the support assembly is driven by a first driving motor;

[0007] A side loading assembly, symmetrically and slidably arranged on the base, and driven by a second driving motor;

[0008] A lower loading assembly, slidably arranged on the base, and driven by a third driving motor;

[0009] The first driving motor, the second driving motor, and the third driving motor are all fixed inside the base, and there are two first driving motors and two second driving motors, respectively controlling the two support assemblies and the side loading assembly;

[0010] An upper loading assembly, erected on the upper end surface of the base.

[0011] Preferably, the support assembly includes:

[0012] A sliding plate, slidably arranged on the base;

[0013] Support plates, configured to be two, symmetrically fixed on the sliding plate;

[0014] A lifting cylinder block, fixed between the two support plates;

[0015] A support member, slidably arranged between the two support plates and driven by the lifting cylinder block;

[0016] A clamping member, fixed on the support member and having a 90° angle with the support member for placing a combined bridge.

[0017] Preferably, the side loading assembly includes:

[0018] A sliding seat, slidably arranged on the base;

[0019] A connecting plate, fixed on the sliding seat;

[0020] A side cylinder block, fixed on the connecting plate;

[0021] A loading plate 1, fixed at the output end of the side cylinder block.

[0022] Preferably, a plurality of sliding columns are symmetrically and slidably arranged on the upper and lower end faces of the loading plate 1. An auxiliary plate is fixed on the sliding columns, and a pressing spring is arranged between the plurality of sliding columns and the loading plate 1.

[0023] Preferably, both the lower loading assembly and the upper loading assembly include a pressing assembly. The pressing assembly includes a plurality of loading cylinder blocks and an adjusting assembly. Among them, the adjusting assembly is fixed at the output ends of the plurality of loading cylinder blocks.

[0024] Preferably, the lower loading assembly further includes a driving plate. The driving plate is slidably arranged on the base and driven by a driving motor 3. The adjusting assembly is fixed on the driving plate;

[0025] The upper loading assembly further includes two support frames. An adjusting motor is fixed on the two support frames. The output end of the adjusting motor is fixed with a fixing plate, and the adjusting assembly is fixed on the fixing plate.

[0026] Preferably, the adjusting assembly includes:

[0027] A loading plate 2, fixed at the output end of the loading cylinder block;

[0028] A centralized plate, fixed at the middle position of the loading plate 2;

[0029] Pressing plates, configured to be two, symmetrically slidably arranged on the loading plate 2 by a plurality of guide columns;

[0030] Adjusting screws, configured to be a plurality of, threadedly connected in the loading plate 2, and one end is rotatably connected to the pressing plate, and the plurality of adjusting screws and the plurality of guide columns are arranged in a staggered manner.

[0031] A method for using a local shear resistance test device for a steel core-UHPC composite bridge includes the following steps:

[0032] S1. Fixing the composite bridge; clamping and fixing the composite bridge with two support components;

[0033] S2. Loading test; synchronously moving two side loading components to the position to be tested, and clamping and supporting the side wall of the composite bridge;

[0034] S3. Applying a loading force; respectively moving the lower loading component and the upper loading component to the position to be tested to form a staggered arrangement, and then the lower loading component and the upper loading component synchronously apply a loading force, while the support component near the lower loading component synchronously rises, and the support component near the upper loading component synchronously descends.

[0035] In a method for using a local shear resistance test device for a steel core-UHPC composite bridge, when testing the shear force at the joint of the composite bridge in step S3, first adjust the plurality of adjusting screws of the upper loading component to make the centralized plate protrude, then adjust the plurality of adjusting screws of the lower loading component to make the centralized plate concave, then move both the upper loading component and the lower loading component to the joint so that the two centralized plates correspond, and then synchronously apply a reverse force through the loading cylinder for loading.

[0036] Compared with the prior art, the present invention provides a local shear resistance test device and a using method for a steel core-UHPC composite bridge, having the following beneficial effects:

[0037] The present invention can support the side wall of the composite bridge through the side loading component, thereby avoiding the generation of additional force on the side wall of the composite bridge during the loading test. Through the coordinated lifting of the lower loading component, the descending of the upper loading component and the lifting of the support component, a dynamic shear force field is formed to apply a local force, so that the section to be tested of the composite bridge is not affected by the force generated by the deformation of the composite bridge itself during the test, improving the accuracy of the shear force test. Moreover, the centralized plates of the upper and lower loading components can be concavely and convexly corresponded and engaged, accurately focusing the loading force on the joint area, directly testing the shear performance of the weakest interface, and improving the test efficiency. Description of the Drawings

[0038] Figure 1 It is a schematic structural diagram of the overall local shear resistance test device for a steel core-UHPC composite bridge;

[0039] Figure 2 It is a schematic structural diagram of the support component of the local shear resistance test device for a steel core-UHPC composite bridge;

[0040] Figure 3Schematic diagram of the side loading component structure of a local shear resistance test device for a steel core-UHPC composite bridge;

[0041] Figure 4 Schematic diagram of the upper loading component structure of a local shear resistance test device for a steel core-UHPC composite bridge;

[0042] Figure 5 Schematic diagram of the adjustment component structure of a local shear resistance test device for a steel core-UHPC composite bridge;

[0043] Figure 6 Schematic diagram of the force on a local shear resistance test device for a steel core-UHPC composite bridge;

[0044] Figure 7 Schematic diagram of the force on an existing shear resistance test device;

[0045] In the figure: 1. Base; 2. Support component; 3. Side loading component; 4. Lower loading component; 5. Upper loading component; 6. Composite bridge; 21. Sliding plate; 22. Support plate; 23. Lifting cylinder body; 24. Support member; 25. Clamping member; 31. Sliding seat; 32. Connecting plate; 33. Side cylinder body; 34. Loading plate 1; 35. Sliding column; 36. Auxiliary plate; 51. Support frame; 52. Adjusting motor; 53. Fixed plate; 54. Loading cylinder body; 55. Adjusting component; 551. Loading plate 2; 552. Concentrating plate; 553. Pressing plate; 554. Guide post; 555. Adjusting screw; 61. Section to be measured. Detailed implementation

[0046] Refer to Figures 1-7 , the present invention provides a technical solution: a local shear resistance test device for a steel core-UHPC composite bridge, including:

[0047] A base 1, on which a support component 2 is symmetrically and slidably arranged above, and the support component 2 is driven by a driving motor 1;

[0048] A side loading component 3, symmetrically and slidably arranged on the base 1, and driven by a driving motor 2;

[0049] A lower loading component 4, slidably arranged on the base 1, and driven by a driving motor 3;

[0050] The driving motor 1, driving motor 2 and driving motor 3 are all fixed in the base 1, and both the driving motor 1 and the driving motor 2 are two, respectively controlling the two support components 2 and the side loading component 3;

[0051] An upper loading component 5, erected on the upper end surface of the base 1.

[0052] In this embodiment, the support assembly 2 includes:

[0053] A sliding plate 21, which is slidably arranged on the base 1;

[0054] Two support plates 22, which are symmetrically fixed on the sliding plate 21;

[0055] A lifting cylinder body 23, which is fixed between the two support plates 22;

[0056] A support member 24, which is slidably arranged between the two support plates 22 and is driven by the lifting cylinder body 23;

[0057] A clamping member 25, which is fixed on the support member 24 and has a 90° angle with the support member 24 for placing the combined bridge 6.

[0058] It should be noted that when testing a local position of the combined bridge 6, at this time, the two support assemblies 2 cooperate with the lower loading assembly 4 and the upper loading assembly 5 to lift and form a dynamic shear force field, which is convenient for applying local force, so that the test section 61 of the combined bridge 6 is not affected by the force generated by the deformation of the combined bridge 6 itself during the test, and the accuracy of the shear force test is improved;

[0059] In this embodiment, the side loading assembly 3 includes:

[0060] A sliding seat 31, which is slidably arranged on the base 1;

[0061] A connecting plate 32, which is fixed on the sliding seat 31;

[0062] A side cylinder body 33, which is fixed on the connecting plate 32;

[0063] A first loading plate 34, which is fixed at the output end of the side cylinder body 33.

[0064] As a preferred embodiment, a plurality of sliding columns 35 are symmetrically slidably arranged on the upper and lower end faces of the first loading plate 34. An auxiliary plate 36 is fixed on the sliding columns 35, and a pressing spring is arranged between the plurality of sliding columns 35 and the first loading plate 34.

[0065] It should be noted that the lateral support force applied by the side loading assembly 3 does not increase additional force to the combined bridge 6. That is to say, during support, the first loading plate 34 is only in contact with the side wall of the combined bridge 6, which can prevent the side wall of the combined bridge 6 from deforming, and the auxiliary plate 36 can support the combined bridge 6 with different thicknesses.

[0066] As a preferred embodiment, both the lower loading component 4 and the upper loading component 5 include a pressing component. The pressing component includes a plurality of loading cylinders 54 and an adjusting component 55. Among them, the adjusting component 55 is fixed to the output ends of the plurality of loading cylinders 54.

[0067] As a preferred embodiment, the lower loading component 4 further includes a driving plate. The driving plate is slidably arranged on the base 1 and is driven by the third driving motor. The adjusting component 55 is fixed on the driving plate;

[0068] The upper loading component 5 further includes two support frames 51. An adjusting motor 52 is fixed on the two support frames 51. The output end of the adjusting motor 52 is fixed with a fixing plate 53, and the adjusting component 55 is fixed on the fixing plate 53.

[0069] As a preferred embodiment, the adjusting component 55 includes:

[0070] The second loading plate 551 is fixed to the output end of the loading cylinder 54;

[0071] The centralized plate 552 is fixed at the middle position of the second loading plate 551;

[0072] Two pressing plates 553 are configured, and are symmetrically slidably arranged on the second loading plate 551 by a plurality of guide posts 554;

[0073] A plurality of adjusting screws 555 are configured, are threadedly connected in the second loading plate 551, and one end thereof is rotatably connected to the pressing plate 553, and the plurality of adjusting screws 555 and the plurality of guide posts 554 are arranged in a staggered manner.

[0074] It should be noted that the length of the second loading plate 551 is greater than the width of the composite bridge 6, so as to be able to apply a uniform loading force to the upper and lower surfaces of the composite bridge 6.

[0075] A use method of a local shear resistance test device for a steel inner core-UHPC composite bridge includes the following steps:

[0076] S1. Fix the composite bridge 6; clamp and fix the composite bridge 6 with two support components 2;

[0077] S2. Loading test; synchronously move the two side loading components 3 to the position to be tested, and clamp and support the side wall of the composite bridge 6;

[0078] S3. Apply the loading force; move the lower loading component 4 and the upper loading component 5 to the position to be tested respectively, so that they are arranged in a staggered manner. Then, the lower loading component 4 and the upper loading component 5 synchronously apply the loading force, and at the same time, the support component 2 close to the lower loading component 4 synchronously rises, and the support component 2 close to the upper loading component 5 synchronously descends.

[0079] Among them, when the two side loading components 3 move to the position to be tested, when the lower loading component 4 and the upper loading component 5 apply the loading force, they first contact the auxiliary plate 36, causing the auxiliary plate 36 to be compressed, so as to adapt to the thickness of the combined bridge 6.

[0080] Such as Figure 7 , this is a schematic diagram of the force of the prior art. The support component 2 is in a fixed state. When the loading device applies the force F, the support component 2 provides an upward support force F'. When the applied force F increases, the combined bridge 6 itself will have a tendency to bend downward, thereby generating a force f, which affects the test of the shear force of the section to be measured 61.

[0081] Such as Figure 6 , this is a schematic diagram of the force of this device. The two support components 2 cooperate with the lower loading component 4 and the upper loading component 5 to lift and lower to form a dynamic shear force field, which is convenient for applying local force, so that the section 61 to be measured of the combined bridge 6 is not affected by the force generated by the deformation of the combined bridge 6 itself during the test, improving the accuracy of the shear force test. That is to say, the upper loading component 5 and the lower loading component 4 synchronously apply forces F in opposite directions. At this time, the two support components 2 respectively perform opposite lifting and lowering, applying force N, so that the two sides of the combined bridge 6 move synchronously and dynamically, and only the section 61 to be measured is stressed, improving the accuracy of the shear force test.

[0082] As a preferred embodiment, when testing the shear force at the joint of the combined bridge 6 in step S3, first adjust the multiple adjusting screws 555 of the upper loading component 5 to make the centralized plate 552 protrude, then adjust the multiple adjusting screws 555 of the lower loading component 4 to make the centralized plate 552 concave, then move the upper loading component 5 and the lower loading component 4 to the joint so that the two centralized plates 552 correspond, and then apply a reverse force through the loading cylinder 54 for loading.

[0083] That is to say, the centralized plates 552 of the upper loading component 5 and the lower loading component 4 can be concavely and convexly corresponding and engaged, focusing the loading force precisely on the joint area, directly testing the shear performance of the weakest interface, and improving the test efficiency.

[0084] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A local shear resistance test device for a steel inner core-UHPC composite bridge, characterized in that, Including: A base (1), on which a support assembly (2) is symmetrically and slidably arranged, and the support assembly (2) is driven by a first driving motor; A side loading assembly (3), symmetrically and slidably arranged on the base (1), and driven by a second driving motor; A lower loading assembly (4), slidably arranged on the base (1), and driven by a third driving motor; The first driving motor, the second driving motor and the third driving motor are all fixed inside the base (1), and both the first driving motor and the second driving motor are two, respectively controlling the two support assemblies (2) and the side loading assembly (3); An upper loading assembly (5), erected on the upper end surface of the base (1).

2. The partial shear resistance test device for a steel inner core - UHPC composite bridge according to claim 1, characterized in that, The support assembly (2) includes: A sliding plate (21), slidably arranged on the base (1); Two support plates (22), symmetrically fixed on the sliding plate (21); A lifting cylinder block (23), fixed between the two support plates (22); A support member (24), slidably arranged between the two support plates (22), and driven by the lifting cylinder block (23); A clamping member (25), fixed on the support member (24), and having a 90° angle with the support member (24), for placing a combined bridge (6).

3. The partial shear resistance test device for a steel inner core - UHPC composite bridge according to claim 1, characterized in that, The side loading assembly (3) includes: A sliding seat (31), slidably arranged on the base (1); A connecting plate (32), fixed on the sliding seat (31); A side cylinder block (33), fixed on the connecting plate (32); A first loading plate (34), fixed on the output end of the side cylinder block (33).

4. A local shear resistance test device for a steel inner core-UHPC composite bridge according to claim 3, characterized in that, A plurality of sliding columns (35) are symmetrically and slidably arranged on the upper and lower end faces of the first loading plate (34), an auxiliary plate (36) is fixed on the sliding columns (35), and a pressing spring is arranged between the plurality of sliding columns (35) and the first loading plate (34).

5. The partial shear resistance test device for a steel core-UHPC composite bridge according to claim 4, characterized in that, Both the lower loading assembly (4) and the upper loading assembly (5) include a pressing assembly, the pressing assembly includes a plurality of loading cylinder blocks (54) and an adjusting assembly (55), wherein the adjusting assembly (55) is fixed on the output ends of the plurality of loading cylinder blocks (54).

6. The partial shear resistance test device for a steel core-UHPC composite bridge according to claim 5, characterized in that, The lower loading assembly (4) further includes a driving plate, the driving plate is slidably arranged on the base (1), and is driven by the third driving motor, and the adjusting assembly (55) is fixed on the driving plate; The upper loading assembly (5) further includes two support frames (51), an adjusting motor (52) is fixed on the two support frames (51), a fixing plate (53) is fixed on the output end of the adjusting motor (52), and the adjusting assembly (55) is fixed on the fixing plate (53).

7. The partial shear resistance test device for a steel core-UHPC composite bridge according to claim 6, characterized in that, The adjusting assembly (55) includes: A second loading plate (551), fixed on the output end of the loading cylinder block (54); A centralized plate (552), fixed at the middle position of the second loading plate (551); Two pressing plates (553), symmetrically slidably arranged on the second loading plate (551) by a plurality of guiding columns (554); Adjusting screws (555), configured to be multiple, are threadedly connected inside the second loading plate (551), and one end thereof is rotatably connected to the pressing plate (553), and the multiple adjusting screws (555) and the multiple guide posts (554) are arranged alternately.

8. A method for using a local shear resistance test device for a steel core-UHPC composite bridge, which uses a local shear resistance test device for a steel core-UHPC composite bridge as described in claim 7, characterized in that, Including the following steps: S1. Fixing the composite bridge (6); clamping and fixing the composite bridge (6) with two support assemblies (2); S2. Loading test; synchronously moving the two side loading assemblies (3) to the position to be tested, and clamping and supporting the side wall of the composite bridge (6); S3. Applying a loading force; respectively moving the lower loading assembly (4) and the upper loading assembly (5) to the position to be tested to form an alternating arrangement, and then the lower loading assembly (4) and the upper loading assembly (5) synchronously apply a loading force, and at the same time, the support assemblies (2) close to the lower loading assembly (4) rise synchronously, and the support assemblies (2) close to the upper loading assembly (5) descend synchronously.

9. The method of using a local shear resistance test device for a steel core-UHPC composite bridge according to claim 8, characterized in that, In step S3, when testing the shear force at the joint of the composite bridge (6), first adjust the multiple adjusting screws (555) of the upper loading assembly (5) to make the concentrated plate (552) protrude, then adjust the multiple adjusting screws (555) of the lower loading assembly (4) to make the concentrated plate (552) concave, then move both the upper loading assembly (5) and the lower loading assembly (4) to the joint so that the two concentrated plates (552) correspond, and then synchronously apply a reverse force through the loading cylinder body (54) for loading.

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