A composite torsion loading test device

Abstract

The present invention relates to the technical field of force loading test of engineering structural components, specifically a composite torsion loading test device. In order to solve the problem that the rotation center connection line of the servo actuator and the two-force rod relative to the loading beam in the traditional composite torsion loading test device is not parallel to the length arrangement direction of the loading beam, a new composite torsion loading test device is provided, including a loading beam, a servo actuator, a two-force rod, a reaction wall, an axial jack, a reaction assembly, and a base. A front vertical rotating shaft and a rear vertical rotating shaft are fixed in the loading beam, and the axis connection line of the front vertical rotating shaft and the rear vertical rotating shaft is parallel to the length arrangement direction of the loading beam. A front sleeve and a rear sleeve are respectively rotated outside the front vertical rotating shaft and the rear vertical rotating shaft, and the right ends of the servo actuator and the two-force rod are fixed to the rear sleeve and the front sleeve respectively. The device simplifies the difficulty of data processing and improves the accuracy of the test.

Description

Technical Field

[0001] The invention relates to the technical field of stress loading tests for engineering structural components, in particular to a composite torsion loading test device. Background Art

[0002] With the continuous development of society, the service environment of engineering structural components is becoming increasingly complex, and the demand for them to have large spans, heavy loads, and light weight is increasing. Under the influence of earthquakes, wind, and vehicle and ship impact loads, engineering structural components are often subjected to a combined compression-bending-torsion stress state, and their failure mode and stress performance are different from those under a single stress state. For special-shaped structural systems with misaligned centroids and shear centers, as well as flexible wind turbine towers, the influence of torque on their mechanical properties is particularly significant. Therefore, conducting experimental research on engineering structural components subjected to combined torsion loading is of great significance for the structural optimization design and accurate evaluation of engineering structural components throughout their life cycle.

[0003] A traditional composite torsional loading test device includes a servo actuator, a two-force rod, an axial jack, a triangular reaction frame, a reaction wall, a loading beam, and a base. The workpiece structural component is arranged between the loading beam and the base. The length direction of the loading beam is arranged along the front-to-back direction. The axial directions of the servo actuator and the two-force rod are arranged along the left-to-right direction. One end of the servo actuator and the two-force rod are fixed to the reaction wall. The other end of the servo actuator is directly anchored to the rear end of the loading beam by bolts. The other end of the two-force rod is directly hinged to the front end of the loading beam. The triangular reaction frame is located above the loading beam, and one of its right-angled surfaces is fixed to the reaction wall. The other right-angled surface is between the loading beam and the axial jack. In this composite torsional loading test device, although torque can be smoothly applied to the engineering structural components through the servo actuator, the line connecting the rotation centers of the servo actuator and the two-force rod relative to the loading beam (in the traditional composite torsional loading test device, the rotation center of the servo actuator relative to the loading beam refers to the hinged part of the other end of the servo actuator itself, and the rotation center of the two-force rod refers to the hinged part of the other end of the two-force rod and the loading beam) is not parallel to the length arrangement direction of the loading beam, which increases the difficulty of subsequent data processing; at the same time, the axial force generated by the axial jack acts directly on the loading beam, and the axial force is transmitted to the engineering structure specimen only by the bending stiffness of the loading beam, which makes it difficult to meet the experimental requirements of large axial compression ratio conditions; in addition, the triangular reaction frame is large in size, complicated to install, and inconvenient to adjust. Summary of the Invention

[0004] In order to solve the problem that the rotation center connection line of the servo actuator and the two force rods relative to the loading beam in the traditional composite torsion loading test device is not parallel to the length arrangement direction of the loading beam, the present invention provides a new composite torsion loading test device.

[0005] The present invention is achieved by adopting the following technical solutions:

[0006] A composite torsion loading test device comprises a box-shaped loading beam, a servo actuator, a two-force rod, a reaction wall, an axial jack, a reaction assembly, and a base. The length direction of the loading beam is arranged along the front-to-back direction. Two vertical rotating shafts distributed front and back are fixed in the loading beam and are respectively a front vertical rotating shaft and a rear vertical rotating shaft. The axis connecting the front vertical rotating shaft and the rear vertical rotating shaft is parallel to the length arrangement direction of the loading beam. The front vertical rotating shaft and the rear vertical rotating shaft are respectively covered with a front sleeve and a rear sleeve. The front sleeve and the front vertical rotating shaft are clearance-matched, and the rear sleeve and the rear vertical rotating shaft are clearance-matched. The two-force rod and the servo actuator are arranged side by side front and back and their axial directions are arranged along the left-right direction. The left ends of the servo actuator and the two-force rod are fixed to the reaction wall, and the right ends of the servo actuator and the two-force rod are respectively fixed to the rear sleeve and the front sleeve. The axial jack is installed between the reaction assembly and the top surface of the loading beam. The base and the bottom surface of the loading beam are used to install engineering structural components.

[0007] Principle: During the test, the engineering structural member is a component with connecting end plates at both ends. The two connecting end plates are bolted to the bottom surface and base of the loading beam respectively. Through the structural design of the front vertical shaft, rear vertical shaft, front sleeve and rear sleeve within the loading beam, the rotation center position of the two-force rod and servo actuator relative to the loading beam is respectively changed to the center position of the front vertical shaft and rear vertical shaft. In turn, the line connecting the rotation center of the two-force rod and servo actuator relative to the loading beam is parallel to the length layout direction of the loading beam. This facilitates the accurate determination of angular displacement data during subsequent torque calculations, simplifies the data processing process, and improves test accuracy.

[0008] Furthermore, the front vertical rotating shaft is a steel tube concrete structure, which can withstand a large axial pressure load and is easy to adapt to the test conditions of a large axial pressure ratio.

[0009] Furthermore, the axial jack is arranged directly above the front vertical rotating shaft, and the engineering structure component is arranged directly below the front vertical rotating shaft, so that the axial pressure applied by the axial jack can be directly transmitted to the engineering structure specimen through the front vertical rotating shaft, effectively reducing the requirements for the stiffness of the loading beam and further meeting the test conditions of a large axial compression ratio.

[0010] Furthermore, the reaction force assembly includes four long threaded steel bars and a box beam located above the loading beam. The length direction of the box beam is arranged in the left-right direction. The top ends of the four long threaded steel bars are respectively fixed to the four corners of the box beam, and the bottom ends of the four long threaded steel bars are threadedly connected to the corresponding positions of the base. The axial jack is located between the bottom surface of the box beam and the loading beam. The structure of the reaction force assembly is concretized and standardized, and the height of the reaction force assembly can be adjusted within the height range of the long threaded steel bars to meet the test requirements under different working conditions.

[0011] Furthermore, the box beam is provided with a left and right sliding sleeve with a rigid splint, which includes an upper splint with a strip-shaped length arranged in the front-to-back direction and a lower splint with a strip-shaped length arranged in the front-to-back direction. The upper splint and the lower splint are respectively located above and below the box beam. The upper splint and the lower splint are connected to the box beam via connecting screws and connecting nuts. The bottom surface of the lower splint is provided with a dovetail-shaped protrusion, and the length arrangement direction of the protrusion is consistent with the length arrangement direction of the lower splint. The top surface of the axial jack is fixed with a horizontal sliding plate, and the top surface of the horizontal sliding plate is provided with a dovetail-shaped groove that matches the protrusion. The axial jack is slidable in the front-to-back direction by the lower splint and the horizontal sliding plate, and the axial jack is moved in the left-to-right direction by the left-right position of the rigid splint relative to the box beam, making it easy to adjust the front-to-back and left-to-right positions of the axial jack to meet the test requirements under different working conditions.

[0012] Furthermore, the loading beam includes a square loading tube with openings at both ends facing left and right, respectively. Two vertical partitions are installed within the loading tube, dividing the space inside the tube from front to back into three chambers: a front chamber, a middle chamber, and a rear chamber. The front and rear vertical rotating shafts are located in the front and rear chambers, respectively. A vertical reinforcement plate is also fixed to the middle of the middle chamber in the left-right direction. This further specifies and standardizes the structure of the loading beam.

[0013] Furthermore, both the front and rear sleeves are semicircular clamps, connected to the two-force rod and servo actuator, respectively, via connectors. Both connectors include a left side plate, with the front and rear plates vertically fixed to the front and rear ends of the right side of the left side plate. The left side of the left side plate is fixed to the right end of the two-force rod or servo actuator, and the right end faces of the front and rear plates are fixedly connected to the corresponding front or rear sleeves. This specific and standardized structure further improves test accuracy.

[0014] Furthermore, a first front transverse stiffening rib is provided between the top end of the front vertical rotating shaft and the inner side surface of the top plate of the loading cylinder, a second front transverse stiffening rib is provided between the bottom end of the front vertical rotating shaft and the inner side surface of the bottom plate of the loading cylinder, a first rear transverse stiffening rib is provided between the top end of the rear vertical rotating shaft and the inner side surface of the top plate of the loading cylinder, and a second rear transverse stiffening rib is provided between the bottom end of the rear vertical rotating shaft and the inner side surface of the bottom plate of the loading cylinder, which increases the overall stiffness of the loading beam and ensures reliable transmission of torque.

[0015] Furthermore, the outer circumferential surface of the front vertical shaft is coated with polytetrafluoroethylene to ensure relative rotation between the front vertical shaft and the front sleeve, and the outer circumferential surface of the rear vertical shaft is coated with polytetrafluoroethylene to ensure relative rotation between the rear vertical shaft and the rear sleeve. In this specific embodiment, normal relative rotation between the front vertical shaft and the front sleeve, and normal relative rotation between the rear vertical shaft and the rear sleeve can also be achieved by the following structure: the outer circumferential surface of the front vertical shaft, the inner circumferential surface of the front sleeve, the outer circumferential surface of the rear vertical shaft, and the inner circumferential surface of the rear sleeve are all coated with copper film, and lubricant is applied between the front vertical shaft and the front sleeve, and lubricant is applied between the rear vertical shaft and the rear sleeve, to ensure normal relative rotation between the front vertical shaft and the front sleeve, and normal relative rotation between the rear vertical shaft and the rear sleeve.

[0016] Furthermore, the base is a box-shaped structure and is fixed to the ground by ground anchors, so the structure is stable.

[0017] The beneficial effects of the present invention are as follows: 1) Through the structural design of the front vertical rotating shaft, the rear vertical rotating shaft, and the front sleeve and the rear sleeve, the rotation center positions of the two-force rod and the servo actuator relative to the loading beam are respectively changed to the center positions of the front vertical rotating shaft and the rear vertical rotating shaft. In addition, the rotation center line connecting the two-force rod and the servo actuator relative to the loading beam is parallel to the length arrangement direction of the loading beam, thereby simplifying the difficulty of data processing and improving the test accuracy;

[0018] 2) The front and rear vertical shafts are constructed of steel tube concrete, and the axial jack is located directly above the front vertical shaft. This allows the axial jack to better transmit the axial force to the engineering structure specimen through the front vertical shaft when applying the axial pressure load, reducing the requirements for the loading beam stiffness and facilitating the application of a larger axial pressure ratio.

[0019] 3) The reaction force component is small in size and easy to install and adjust. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 Schematic diagram of the overall structure of the device of the present invention;

[0023] Figure 2is a schematic diagram of the loading beam structure;

[0024] Figure 3 Schematic diagram of the assembly structure of the loading beam, servo actuator, and two-force rod;

[0025] Figure 4 This is a schematic diagram of the assembly structure of the box beam, rigid splint, horizontal sliding plate, and axial jack.

[0026] In the figure: 1-loading beam, 101-loading cylinder, 102-vertical partition, 103-vertical reinforcement plate, 2-servo actuator, 3-two-force rod, 4-reaction wall, 5-axial jack, 6-reaction assembly, 601-box beam, 602-long threaded steel, 7-base, 8-front vertical rotating shaft, 9-rear vertical rotating shaft, 10-front sleeve, 11-rear sleeve, 12-engineering structure member, 13-rigid splint, 131-upper splint, 132-lower splint, 133-connecting screw, 14-horizontal sliding plate, 15-left side plate, 16-front end plate, 17-rear end plate, 18-first front transverse stiffener, 19-second front transverse stiffener, 20-first rear transverse stiffener, 21-second rear transverse stiffener. DETAILED DESCRIPTION

[0027] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0028] In the description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance. It should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, removable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms based on specific circumstances.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] like Figure 1 、 2As shown, a composite torsion loading test device includes a box-shaped loading beam 1, a servo actuator 2, a two-force rod 3, a reaction wall 4, an axial jack 5, a reaction assembly 6, and a base 7. The length direction of the loading beam 1 is arranged along the front-to-back direction. Two vertical rotating shafts distributed front and back are fixed in the loading beam 1 and are respectively a front vertical rotating shaft 8 and a rear vertical rotating shaft 9. The axis connecting the front vertical rotating shaft 8 and the rear vertical rotating shaft 9 is parallel to the length direction of the loading beam 1. The front vertical rotating shaft 8 and the rear vertical rotating shaft 9 are respectively covered with a front sleeve 10 and a rear sleeve 10. 1, the front sleeve 10 and the front vertical rotating shaft 8 have a clearance fit, the rear sleeve 11 and the rear vertical rotating shaft 9 have a clearance fit, the two-force rod 3 and the servo actuator 2 are arranged side by side front and back and their axial directions are arranged along the left and right directions, the left ends of the servo actuator 2 and the two-force rod 3 are fixed to the reaction wall 4, and the right ends of the servo actuator 2 and the two-force rod 3 are fixed to the rear sleeve 11 and the front sleeve 10 respectively, the axial jack 5 is installed between the reaction assembly 6 and the top surface of the loading beam 1, and the base 7 and the bottom surface of the loading beam 1 are used to install the engineering structure component 12.

[0032] Principle: During the test, the engineering structural member 12 is a member with connecting end plates at both ends, and the two connecting end plates are fixed to the bottom surface of the loading beam 1 and the base 7 respectively by bolts. Through the structural design of the front vertical rotating shaft 8, rear vertical rotating shaft 9, front sleeve 10, and rear sleeve 11 in the loading beam 1, the rotation center position of the two-force rod 3 and servo actuator 2 relative to the loading beam 1 is respectively changed to the center position of the front vertical rotating shaft 8 and rear vertical rotating shaft 9. In addition, the line connecting the rotation center of the two-force rod 3 and servo actuator 2 relative to the loading beam 1 is parallel to the length layout direction of the loading beam 1. This facilitates the accurate determination of angular displacement data during the subsequent torque calculation, simplifies the data processing process, and improves the test accuracy.

[0033] In specific implementation, the front vertical rotating shaft 8 is a steel tube concrete structure, which can withstand a large axial pressure load and is convenient for adapting to the test conditions of a large axial pressure ratio.

[0034] During specific implementation, the axial jack 5 is arranged directly above the front vertical rotating shaft 8, and the engineering structure component 12 is arranged directly below the front vertical rotating shaft 8, so that the axial pressure applied by the axial jack 5 can be directly transmitted to the engineering structure specimen through the front vertical rotating shaft 8, effectively reducing the requirements for the stiffness of the loading beam 1 and further meeting the test conditions of a large axial compression ratio.

[0035] During specific implementation, the reaction force assembly 6 includes four long threaded steel bars 602 and a box beam 601 located above the loading beam 1. The length direction of the box beam 601 is arranged along the left-right direction. The top ends of the four long threaded steel bars 602 are respectively fixed to the four corners of the box beam 601, and the bottom ends of the four long threaded steel bars 602 are threadedly connected to the corresponding positions of the base 7. The axial jack 5 is located between the bottom surface of the box beam 601 and the loading beam 1. The structure of the reaction force assembly 6 is concretized and standardized, and the reaction force assembly 6 can adjust its height within the height range of the long threaded steel bars 602 to meet the test requirements under different working conditions.

[0036] In specific implementation, the box beam 601 is provided with a rigid clamping plate 13 for sliding around. Figure 4 As shown, the rigid splint 13 includes an upper splint 131 in the form of a strip, the length of which is arranged along the front-to-back direction, and a lower splint 132 in the form of a strip, the length of which is arranged along the front-to-back direction. The upper splint 131 and the lower splint 132 are respectively located above and below the box beam 601. The upper splint 131 and the lower splint 132 are connected to the box beam 601 through connecting screws 133 and connecting nuts. The bottom surface of the lower splint 132 is provided with a dovetail-shaped convex strip, and the length arrangement direction of the convex strip is consistent with the length arrangement direction of the lower splint 132. A horizontal sliding plate 14 is fixed to the top surface of the axial jack 5, and the top surface of the horizontal sliding plate 14 is provided with a dovetail-shaped groove that is compatible with the convex strip. The axial jack 5 can slide in the front-to-back direction through the lower clamping plate 132 and the horizontal sliding plate 14, and the axial jack 5 can move in the left-to-right direction through the left-right position of the rigid clamping plate 13 relative to the box beam 601, which makes it convenient to adjust the front-to-back and left-to-right positions of the axial jack 5 to meet the test requirements under different working conditions.

[0037] In practice, loading beam 1 comprises a square loading tube 101, with its two ends facing left and right, respectively. Two vertical partitions 102 are located within loading tube 101, dividing the interior of loading tube 101 into three chambers from front to back: a front chamber, a middle chamber, and a rear chamber. Front vertical rotating shaft 8 and rear vertical rotating shaft 9 are located within the front chamber and the rear chamber, respectively. A vertical reinforcement plate 103 is also secured to the center of the middle chamber in the left-right direction. This results in a more specific and standardized structure for loading beam 1.

[0038] In a specific implementation, the front sleeve 10 and the rear sleeve 11 are both semicircular clamps, and the front sleeve 10 and the rear sleeve 11 are respectively connected to the two-force rod 3 and the servo actuator 2 through connecting parts. The two connecting parts include a left side plate 15, and the front and rear ends of the right side of the left side plate 15 are respectively vertically fixed with a front end plate 16 and a rear end plate 17. The left side of the left side plate 15 is fixed to the right end of the two-force rod 3 or the servo actuator 2, and the right end surfaces of the front end plate 16 and the rear end plate 17 are fixedly connected to the corresponding front sleeve 10 or rear sleeve 11. Figure 3The structure is specified and standardized, which further improves the test accuracy.

[0039] In specific implementation, a first front transverse stiffening rib 18 is provided between the top end of the front vertical rotating shaft 8 and the inner side surface of the top plate of the loading cylinder 101, a second front transverse stiffening rib 19 is provided between the bottom end of the front vertical rotating shaft 8 and the inner side surface of the bottom plate of the loading cylinder 101, a first rear transverse stiffening rib 20 is provided between the top end of the rear vertical rotating shaft 9 and the inner side surface of the top plate of the loading cylinder 101, and a second rear transverse stiffening rib 21 is provided between the bottom end of the rear vertical rotating shaft 9 and the inner side surface of the bottom plate of the loading cylinder 101, which increases the overall stiffness of the loading beam 1 and ensures reliable transmission of torque.

[0040] In this specific embodiment, the outer circumferential surface of the front vertical rotating shaft 8 is coated with polytetrafluoroethylene to ensure the relative rotation between the front vertical rotating shaft 8 and the front sleeve 10, and the outer circumferential surface of the rear vertical rotating shaft 9 is coated with polytetrafluoroethylene to ensure the relative rotation between the rear vertical rotating shaft 9 and the rear sleeve 11. In this specific embodiment, the normal relative rotation between the front vertical rotating shaft 8 and the front sleeve 10, and the normal relative rotation between the rear vertical rotating shaft 9 and the rear sleeve 11 can also be achieved by the following structure: the outer circumferential surface of the front vertical rotating shaft 8, the inner circumferential surface of the front sleeve 10, the outer circumferential surface of the rear vertical rotating shaft 9, and the inner circumferential surface of the rear sleeve 11 are all coated with copper film, lubricant is applied between the front vertical rotating shaft 8 and the front sleeve 10, and lubricant is applied between the rear vertical rotating shaft 9 and the rear sleeve 11, to ensure the normal relative rotation between the front vertical rotating shaft 8 and the front sleeve 10, and the normal relative rotation between the rear vertical rotating shaft 9 and the rear sleeve 11.

[0041] In this specific embodiment, the base 7 is a box-shaped structure and is fixed to the ground by ground anchors, so the structure is stable.

[0042] The above description is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions have been made with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the technical solutions of the embodiments, and they should all be included in the scope of protection of the claims.

Claims

1. A composite torsion loading test device, characterized in that: The invention comprises a box-shaped loading beam (1), a servo actuator (2), a two-force rod (3), a reaction wall (4), an axial jack (5), a reaction assembly (6), and a base (7). The length direction of the loading beam (1) is arranged along the front-back direction. Two vertical rotating shafts distributed front and back are fixed in the loading beam (1), and are respectively a front vertical rotating shaft (8) and a rear vertical rotating shaft (9). The axis connecting the front vertical rotating shaft (8) and the rear vertical rotating shaft (9) is parallel to the length arrangement direction of the loading beam (1). The front vertical rotating shaft (8) and the rear vertical rotating shaft (9) are respectively covered with a front sleeve (10) and a rear sleeve (11). The front sleeve (10) and the front vertical rotating shaft (8) are clearance-matched, and the rear sleeve (11) and the rear vertical rotating shaft (9) are clearance-matched. The two-force rod (3) and the servo actuator are arranged in a longitudinal direction. (2) are arranged side by side in the front and back directions and their axial directions are arranged in the left and right directions. The left ends of the servo actuator (2) and the two-force rod (3) are fixed to the reaction wall (4). The right ends of the servo actuator (2) and the two-force rod (3) are fixed to the rear sleeve (11) and the front sleeve (10) respectively. The axial jack (5) is installed between the reaction component (6) and the top surface of the loading beam (1). The base (7) and the bottom surface of the loading beam (1) are used to install the engineering structure component (12). The front vertical shaft (8) is a steel tube concrete structure. The axial jack (5) is arranged directly above the front vertical shaft (8), and the engineering structure component (12) is arranged directly below the front vertical shaft (8), so that the axial pressure applied by the axial jack can be directly transmitted to the engineering structure specimen through the front vertical shaft.

2. A composite torsion loading test device according to claim 1, characterized in that: The reaction force assembly (6) includes four long threaded steel bars (602) and a box beam (601) located above the loading beam (1). The length direction of the box beam (601) is arranged in the left-right direction. The top ends of the four long threaded steel bars (602) are respectively fixed to the four corners of the box beam (601). The bottom ends of the four long threaded steel bars (602) are threadedly connected to the corresponding positions of the base (7). The axial jack (5) is located between the bottom surface of the box beam (601) and the loading beam (1).

3. A composite torsion loading test device according to claim 2, characterized in that: The left and right sliding sleeves of the box beam (601) are provided with rigid splints (13), and the rigid splints (13) include an upper splint (131) whose length direction is arranged along the front-back direction, and a lower splint (132) whose length direction is arranged along the front-back direction. The upper splint (131) and the lower splint (132) are respectively located above and below the box beam (601). The upper splint (131) and the lower splint (132) are connected to the box beam (601) through connecting screws (133) and connecting nuts. The bottom surface of the lower splint (132) is provided with a dovetail-shaped convex strip, and the length arrangement direction of the convex strip is consistent with the length arrangement direction of the lower splint (132). A horizontal sliding plate (14) is fixed to the top surface of the axial jack (5), and the top surface of the horizontal sliding plate (14) is provided with a dovetail-shaped groove adapted to the convex strip.

4. A composite torsion loading test device according to claim 3, characterized in that: The loading beam (1) includes a square loading cylinder (101), with openings at both ends of the loading cylinder (101) facing left and right respectively. Two vertical partitions (102) are provided in the loading cylinder (101), and the two vertical partitions (102) divide the space in the loading cylinder (101) into three chambers from front to back, namely a front chamber, a middle chamber and a rear chamber. A front vertical rotating shaft (8) and a rear vertical rotating shaft (9) are respectively located in the front chamber and the rear chamber. A vertical reinforcing plate (103) is also fixed in the middle of the left and right directions in the middle chamber.

5. A composite torsion loading test device according to claim 4, characterized in that: The front sleeve (10) and the rear sleeve (11) are both semicircular clamps. The front sleeve (10) and the rear sleeve (11) are respectively connected to the two-force rod (3) and the servo actuator (2) through connecting parts. The two connecting parts each include a left side plate (15). The front and rear ends of the right side of the left side plate (15) are respectively vertically fixed with a front end plate (16) and a rear end plate (17). The left side of the left side plate (15) is fixed to the right end of the two-force rod (3) or the servo actuator (2), and the right end surfaces of the front end plate (16) and the rear end plate (17) are fixedly connected to the corresponding front sleeve (10) or rear sleeve (11).

6. A composite torsion loading test device according to claim 5, characterized in that: A first front transverse stiffening rib (18) is provided between the top end of the front vertical rotating shaft (8) and the inner side surface of the top plate of the loading cylinder (101), a second front transverse stiffening rib (19) is provided between the bottom end of the front vertical rotating shaft (8) and the inner side surface of the bottom plate of the loading cylinder (101), a first rear transverse stiffening rib (20) is provided between the top end of the rear vertical rotating shaft (9) and the inner side surface of the top plate of the loading cylinder (101), and a second rear transverse stiffening rib (21) is provided between the bottom end of the rear vertical rotating shaft (9) and the inner side surface of the bottom plate of the loading cylinder (101).

7. A composite torsion loading test device according to claim 6, characterized in that: The outer circumferential surface of the front vertical rotating shaft (8) is coated with polytetrafluoroethylene, and the outer circumferential surface of the rear vertical rotating shaft (9) is coated with polytetrafluoroethylene.

8. A composite torsion loading test device according to claim 7, characterized in that: The base (7) is a box-shaped structure and is fixed to the ground by ground anchors.

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