A local shear test device and method for a steel core-UHPC composite bridge

Abstract

The present invention discloses a local shear resistance test device for a steel core-UHPC composite bridge and a method for using the same, and relates to the technical field of shear resistance test for composite bridges. The present invention comprises a base, on which a support assembly is symmetrically and slidingly arranged, and the support assembly is driven by a first drive motor; a side loading assembly, symmetrically and slidingly arranged on the base, and driven by a second drive motor; a lower loading assembly, slidably arranged on the base, and driven by a third drive motor; the first drive motor, the second drive motor, and the third drive motor are all fixed in the base, and there are two of the first drive motor and the second drive motor, which respectively control the two support assemblies and the side loading assembly; an upper loading assembly, which is mounted on the upper end face of the base. The present invention can accurately focus the loading force on the joint area, directly test the weakest interface shear performance, and improve the test efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of shear resistance testing of composite bridges, and in particular to a local shear resistance testing device for a steel inner core-UHPC composite bridge and a use method thereof. Background Art

[0002] Shear strength, also known as shear strength, is the ultimate strength generated when the material is sheared. It reflects the material's ability to resist shear sliding. Its numerical value is equal to the tangential stress value on the shear surface, that is, the ratio of the shear force formed on the shear surface to the damage area.

[0003] The existing shear resistance test device uses a shear universal testing machine, which performs testing by applying downward pressure to the test position of the combined bridge. The detection mode is single, and when pressure is applied downward, the combined bridge will tend to bend at the pressure-applied position. At this time, the test position of the combined bridge will be subjected to forces in multiple directions, thereby affecting the shear force test and causing inaccurate results. In addition, when testing the joints of the combined bridge, the overall length of the combined bridge causes the shear force to be unconcentrated, resulting in inaccurate test results at the joints.

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

[0005] To achieve the above objectives, 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 slidably arranged, and the support assembly is driven by a drive motor;

[0007] A side loading assembly is symmetrically slidably disposed on the base and driven by a second drive motor;

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

[0009] The drive motor 1, the drive motor 2 and the drive motor 3 are all fixed in the base, and there are two drive motors 1 and 2, which respectively control the two support assemblies and the side loading assembly;

[0010] The upper loading assembly is mounted on the upper end surface of the base.

[0011] Preferably, the support assembly includes:

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

[0013] The supporting plates are configured as two and symmetrically fixed on the sliding plate;

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

[0015] A support member is slidably disposed between the two support plates and driven by the lifting cylinder;

[0016] The clamping member is fixed on the supporting member and has a 90° angle with the supporting member, and is used to place the combined bridge.

[0017] Preferably, the side loading assembly comprises:

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

[0019] a connecting plate fixed on the sliding seat;

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

[0021] The first loading plate is fixed on the output end of the side cylinder body.

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

[0023] Preferably, the lower loading assembly and the upper loading assembly both include a pressing assembly, and the pressing assembly includes a plurality of loading cylinders and an adjusting assembly, wherein the adjusting assembly is fixed to the output ends of the plurality of loading cylinders.

[0024] Preferably, the lower loading assembly further comprises a driving plate, the driving plate being slidably disposed on the base and driven by the driving motor 3, and an adjusting assembly being fixed on the driving plate;

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

[0026] Preferably, the adjustment component includes:

[0027] A second loading plate is fixed to the output end of the loading cylinder;

[0028] a concentrating plate, fixed at the middle position of the second loading plate;

[0029] The pressing plate is configured as two and is symmetrically slidably arranged on the second loading plate using a plurality of guide pillars;

[0030] The adjusting screws are configured as a plurality of screws, which are threadedly connected in the loading plate 2 and one end of which is rotatably connected to the pressing plate. The plurality of adjusting screws are arranged in an alternating manner with the plurality of guide posts.

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

[0032] S1. Fix the combined bridge: Use two support components to clamp and fix the combined bridge.

[0033] S2. Loading test: Synchronously move the two side loading assemblies to the test position and clamp the side walls of the composite bridge for support.

[0034] S3. Apply a loading force; move the lower loading assembly and the upper loading assembly to the test position respectively so that they form a staggered arrangement, and then simultaneously apply the loading force to the lower loading assembly and the upper loading assembly. At the same time, the support assembly located near the lower loading assembly rises synchronously, and the support assembly located near the upper loading assembly falls synchronously.

[0035] A method for using a local shear resistance test device for a steel core-UHPC composite bridge. In step S3, when testing the shear force at a joint of the composite bridge, multiple adjustment screws of an upper loading assembly are first adjusted to make a concentrating plate protrude, and then multiple adjustment screws of a lower loading assembly are adjusted to make the concentrating plate concave. Then, both the upper loading assembly and the lower loading assembly are moved to the joint so that the two concentrating plates correspond, and then a reverse force is synchronously applied by a loading cylinder to perform loading.

[0036] Compared with the existing technology, the present invention provides a local shear resistance test device and method for a steel core-UHPC composite bridge, which has the following beneficial effects:

[0037] The present invention can support the side walls of the combination bridge through the side loading assembly, thereby avoiding additional force on the side walls of the combination bridge during the loading test. Through the rise of the lower loading assembly, the fall of the upper loading assembly + the lifting and lowering coordination of the support assembly, a dynamic shear force field is formed, and local force is applied, so that the tested section of the combination bridge is not affected by the force generated by the deformation of the combination bridge itself during the test, thereby improving the accuracy of the shear force test. In addition, the concentrating plates of the upper and lower loading assemblies can be engaged with each other in a corresponding manner, and the loading force is accurately focused on the joint area, directly testing the weakest interface shear performance, thereby improving the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0039] Figure 2 Schematic diagram of the support assembly structure of a local shear test device for a steel core-UHPC composite bridge;

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

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

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

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

[0044] Figure 7 It is a force diagram of an existing shear test device;

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

[0046] Reference Figure 1-Figure 7 The present invention provides a technical solution: a local shear resistance test device for a steel core-UHPC composite bridge, comprising:

[0047] The base 1 has a support assembly 2 symmetrically slidably arranged on the upper portion thereof, and the support assembly 2 is driven by a drive motor 1;

[0048] A side loading assembly 3 is symmetrically slidably disposed on the base 1 and driven by a second drive motor;

[0049] The lower loading assembly 4 is slidably disposed on the base 1 and driven by a driving motor 3;

[0050] The driving motor 1, the driving motor 2 and the driving motor 3 are all fixed in the base 1, and there are two driving motors 1 and 2, which respectively control the two supporting components 2 and the side loading component 3;

[0051] The upper loading assembly 5 is mounted on the upper end surface of the base 1 .

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

[0053] A sliding plate 21 is slidably disposed on the base 1;

[0054] The supporting plates 22 are configured as two and symmetrically fixed on the sliding plate 21;

[0055] The lifting cylinder 23 is fixed between the two support plates 22;

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

[0057] The clamping member 25 is fixed on the support member 24 and has a 90° angle with the support member 24 , and is used to place the combined bridge 6 .

[0058] It should be noted that when testing a local position of the combined bridge 6, the two support assemblies 2, the lower loading assembly 4, and the upper loading assembly 5 are lifted and lowered in coordination to form a dynamic shear force field, which facilitates the application of local force. This ensures that the tested 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, thereby improving the accuracy of the shear force test.

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

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

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

[0062] The side cylinder 33 is fixed on the connecting plate 32;

[0063] The loading plate 1 34 is fixed to the output end of the side cylinder 33 .

[0064] As a preferred embodiment, a plurality of sliding columns 35 are symmetrically slidably provided on the upper and lower ends of the loading plate 1 34 , an auxiliary plate 36 is fixed on the sliding columns 35 , and a pressing spring is provided between the plurality of sliding columns 35 and the loading plate 1 34 .

[0065] It should be noted that the lateral support force applied by the side loading assembly 3 does not add additional force to the combination bridge 6. That is, when supporting, the loading plate 1 34 is only in contact with the side wall of the combination bridge, which can prevent the side wall of the combination bridge 6 from being deformed, and can support combination bridges 6 of different thicknesses through the auxiliary plate 36.

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

[0067] As a preferred embodiment, the lower loading assembly 4 further includes a driving plate, which is slidably disposed on the base 1 and driven by the driving motor 3, and an adjusting assembly 55 is fixed on the driving plate;

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

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

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

[0071] The centralizing plate 552 is fixed in the middle of the second loading plate 551;

[0072] The pressing plates 553 are configured as two and are symmetrically slidably arranged on the second loading plate 551 using a plurality of guide posts 554;

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

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

[0075] A method for using a local shear resistance test device for a steel core-UHPC composite bridge comprises the following steps:

[0076] S1. The combined bridge 6 is fixed; the combined bridge 6 is clamped and fixed using two support components 2;

[0077] S2 loading test; the two side loading components 3 are moved synchronously to the test position, and the side walls of the combined bridge 6 are clamped and supported;

[0078] S3. Apply loading force; move the lower loading assembly 4 and the upper loading assembly 5 to the positions to be tested respectively, so that they form a staggered arrangement, and then the lower loading assembly 4 and the upper loading assembly 5 apply loading force synchronously, and at the same time, the support assembly 2 located near the lower loading assembly 4 rises synchronously, and the support assembly 2 located near the upper loading assembly 5 falls synchronously.

[0079] Among them, when the two side loading components 3 move to the test position, 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, thereby adapting to the thickness of the combined bridge 6.

[0080] like Figure 7 This is a force diagram of the prior art, in which the support assembly 2 is in a fixed state. When the loading device applies force F, the support assembly 2 provides an upward support force F'. When the applied force F increases, the combined bridge 6 itself tends to bend downward, thereby generating a force f, which affects the shear force test of the section to be tested 61.

[0081] like Figure 6 , is a force diagram of the device. The two support components 2 cooperate with the lower loading component 4 and the upper loading component 5 to rise and fall, forming a dynamic shear force field, which is convenient for applying local force, so that the section 61 to be tested of the combination bridge 6 is not affected by the force generated by the deformation of the combination bridge 6 itself during the test, thereby 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 are lifted and lowered in opposite directions respectively, and a force N is applied, so that the two sides of the combination bridge 6 are synchronously moved dynamically, so that only the section 61 to be tested is subjected to force, thereby 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 adjustment screws 555 of the upper loading component 5 to make the concentrating plate 552 protrude, and then adjust the multiple adjustment screws 555 of the lower loading component 4 to make the concentrating plate 552 concave, and then move both the upper loading component 5 and the lower loading component 4 to the joint so that the two concentrating plates 552 correspond, and then apply reverse force synchronously through the loading cylinder 54 for loading.

[0083] In other words, the concentrating plates 552 of the upper loading assembly 5 and the lower loading assembly 4 can be engaged with each other in a concave and convex manner, so as to accurately focus the loading force on the joint area, directly test the weakest interface shear performance, and improve test efficiency.

[0084] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A local shear test device for a steel core-UHPC composite bridge, characterized in that: include: A base (1) has a support assembly (2) symmetrically slidably arranged on top thereof, and the support assembly (2) is driven by a drive motor 1; A side loading component (3) is symmetrically slidably arranged on the base (1) and driven by a second drive motor. The lateral support force applied by the side loading component (3) does not add additional force to the combined bridge. When supporting, the side loading component (3) is only in contact with the side wall of the combined bridge, which can prevent the side wall of the combined bridge from being deformed and support combined bridges of different thicknesses. A lower loading assembly (4) is slidably disposed on the base (1) and driven by a third drive motor; The first drive motor, the second drive motor and the third drive motor are all fixed in the base (1), and there are two of each of the first drive motor and the second drive motor, which respectively control the two support assemblies (2) and the side loading assembly (3); An upper loading assembly (5) is mounted on the upper end surface of the base (1); When testing a local position of the composite bridge, the lower loading assembly (4) and the upper loading assembly (5) are respectively moved to the positions to be tested so as to form a staggered arrangement. Thereafter, the lower loading assembly (4) and the upper loading assembly (5) apply loading forces synchronously, and the two supporting assemblies (2) are lifted and lowered in coordination with the lower loading assembly (4) and the upper loading assembly (5) to form a dynamic shear force field.

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

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

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

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

6. The local shear resistance test device for a steel core-UHPC composite bridge according to claim 5, characterized in that: The lower loading assembly (4) further comprises a driving plate, the driving plate being slidably disposed on the base (1) and driven by the driving motor 3, and an adjusting assembly (55) being fixed on the driving plate; The upper loading assembly (5) further comprises two support frames (51), an adjusting motor (52) being fixed on the two support frames (51), a fixing plate (53) being fixed to the output end of the adjusting motor (52), and an adjusting assembly (55) being fixed on the fixing plate (53).

7. The local shear resistance test device for a steel core-UHPC composite bridge according to claim 6, characterized in that: The regulating assembly (55) comprises: A second loading plate (551) is fixed to the output end of the loading cylinder (54); A centralizing plate (552) is fixed at the middle position of the second loading plate (551); The pressing plate (553) is configured as two and is symmetrically slidably arranged on the second loading plate (551) using a plurality of guide pillars (554); The adjusting screws (555) are configured as a plurality of screws, which are threadedly connected to the second loading plate (551) and one end of which is rotatably connected to the pressing plate (553). The plurality of adjusting screws (555) and the plurality of guide posts (554) are arranged in an alternating manner.

8. A method for using a local shear test device for a steel core-UHPC composite bridge, which uses the local shear test device for a steel core-UHPC composite bridge according to claim 7, characterized in that: The steps include: S1. The combined bridge (6) is fixed; the combined bridge (6) is clamped and fixed by two support assemblies (2); S2. Loading test; the two side loading components (3) are synchronously moved to the test position, and the side walls of the combined bridge (6) are clamped and supported; S3. Applying a loading force; moving the lower loading assembly (4) and the upper loading assembly (5) to the positions to be tested respectively so as to form a staggered arrangement, and then the lower loading assembly (4) and the upper loading assembly (5) apply a loading force synchronously, and at the same time, the support assembly (2) located near the lower loading assembly (4) rises synchronously, and the support assembly (2) located near the upper loading assembly (5) falls synchronously.

9. The method for using the local shear resistance test device for a steel core-UHPC composite bridge according to claim 8, characterized in that: When the shear force at the joint of the combined bridge (6) is tested in step S3, the plurality of adjusting screws (555) of the upper loading assembly (5) are first adjusted to make the centralizing plate (552) protrude, and then the plurality of adjusting screws (555) of the lower loading assembly (4) are adjusted to make the centralizing plate (552) concave, and then both the upper loading assembly (5) and the lower loading assembly (4) are moved to the joint so that the two centralizing plates (552) correspond, and then the reverse force is applied synchronously by the loading cylinder (54) to perform loading.

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