Composite torsional loading test device

Abstract

The invention relates to the technical field of stress loading tests of engineering structural members, in particular to a composite torsional loading test device. In order to solve the problem that a connecting line of rotation centers of a servo actuator and a two-force rod relative to a loading beam in a traditional composite torsional loading test device is not parallel to the length arrangement direction of the loading beam, a novel composite torsional loading test device is provided. Comprising 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, the axis connecting line of the front vertical rotating shaft and the rear vertical rotating shaft is parallel to the length arrangement direction of the loading beam, and the front vertical rotating shaft and the rear vertical rotating shaft are rotationally sleeved with a front sleeve and a rear sleeve respectively. The right end of the servo actuator and the right end of the two-force rod are fixed to the rear sleeve and the front sleeve respectively. According to the device, the data processing difficulty is simplified, and the test accuracy is improved.

Description

Technical Field

[0001] The invention relates to the technical field of force loading test of 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 more and more complex, and the demand for large span, heavy load and light weight is increasing. Under the action of earthquake, wind, car and ship impact load, engineering structural components are often in a composite stress state of compression-bending-torsion, 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 and flexible wind turbine towers, the influence of torque on their mechanical properties is particularly significant. Therefore, conducting composite torsion loading test research on engineering structural components is of great significance to the structural optimization design and accurate evaluation of engineering structural components throughout their life cycle.

[0003] A traditional composite torsion 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 member 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, one of the right-angled surfaces of which is fixed to the reaction wall, and the other right-angled surface between the loading beam and the loading beam is used to install the axial jack. In this composite torsion loading test device, although the torque can be smoothly applied to the engineering structure member through the servo actuator, the connection line of the rotation center of the servo actuator and the two-force rod relative to the loading beam (in the traditional composite torsion 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 directly acts 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 is 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: A composite torsion loading test device includes a box-shaped loading beam, a servo actuator, a two-force bar, a reaction wall, an axial jack, a reaction component, and a base. The length direction of the loading beam is arranged in the front-rear direction. Two vertical rotating shafts distributed front and rear are fixed inside the loading beam, namely the front vertical rotating shaft and the rear vertical rotating shaft. 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 sleeved outside the front vertical rotating shaft and the rear vertical rotating shaft. The front sleeve has a clearance fit with the front vertical rotating shaft, and the rear sleeve has a clearance fit with the rear vertical rotating shaft. The two-force bar and the servo actuator are arranged side by side in the front-rear direction and their axes are both arranged in the left-right direction. The left ends of the servo actuator and the two-force bar are both fixed to the reaction wall, and the right ends of the servo actuator and the two-force bar are respectively fixed to the rear sleeve and the front sleeve. The axial jack is installed between the reaction component and the top surface of the loading beam, and the base is used to install engineering structure components between the bottom surface of the loading beam.

[0006] Principle description: During the test, the engineering structure component is a component with connection end plates at both ends. The two connection end plates are respectively fixed to the bottom surface of the loading beam and the base through bolts. Through the structural design of the front vertical rotating shaft, rear vertical rotating shaft, front sleeve, and rear sleeve inside the loading beam, the rotation center positions of the two-force bar and the servo actuator relative to the loading beam become the center positions of the front vertical rotating shaft and the rear vertical rotating shaft respectively. Furthermore, the rotation center connection line of the two-force bar and the servo actuator relative to the loading beam is parallel to the length arrangement direction of the loading beam, which is convenient for accurately obtaining the angular displacement data during subsequent torque calculation, simplifies the data processing process, and improves the test accuracy.

[0007] Furthermore, the front vertical rotating shaft is a concrete-filled steel tube structure, which can withstand large axial pressure loads and is convenient for adapting to the test conditions of large axial compression ratios.

[0008] 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, which is convenient for the axial pressure applied by the axial jack to be directly transmitted to the engineering structure specimen through the front vertical rotating shaft, effectively reducing the requirement for the stiffness of the loading beam and further meeting the test conditions of large axial compression ratios.

[0009] Furthermore, the reaction component includes four long threaded steels and a box-shaped beam located above the loading beam. The length direction of the box-shaped beam is arranged in the left-right direction. The top ends of the four long threaded steels are respectively fixed to the four corners of the box-shaped beam, and the bottom ends of the four long threaded steels are threadedly connected to the corresponding positions on the base. The axial jack is located between the bottom surface of the box-shaped beam and the loading beam. The structure of the reaction component is specific and standardized, and the reaction component can adjust its height within the height range of the long threaded steels to meet the test requirements under different working conditions.

[0010] Further, rigid clamping plates are sleeved on the box girder in a left-right sliding manner. The rigid clamping plates include a strip-shaped upper clamping plate whose length direction is arranged in the front-back direction and a strip-shaped lower clamping plate whose length direction is arranged in the front-back direction. The upper clamping plate and the lower clamping plate are respectively located above and below the box girder. The upper clamping plate and the lower clamping plate are connected to the box girder through connecting screws and connecting nuts. A dovetail-shaped rib is provided on the bottom surface of the lower clamping plate, and the length arrangement direction of the rib is consistent with the length arrangement direction of the lower clamping plate. A horizontal sliding plate is fixed on the top surface of the axial jack, and a dovetail-shaped groove adapted to the rib is provided on the top surface of the horizontal sliding plate. The axial jack slides in the front-back direction through the lower clamping plate and the horizontal sliding plate, and the axial jack moves in the left-right direction through the left-right position of the rigid clamping plate relative to the box girder, facilitating the adjustment of the front-back and left-right positions of the axial jack to meet the test requirements under different working conditions.

[0011] Further, the loading beam includes a square loading cylinder. The two ends of the loading cylinder are open and arranged towards the left and right respectively. Two vertical partitions are provided inside the loading cylinder. The space inside the loading cylinder is divided into three chambers from front to back, namely the front chamber, the middle chamber and the back chamber. The front vertical rotating shaft and the rear vertical rotating shaft are respectively located in the front chamber and the back chamber. A vertical reinforcing plate is also fixed in the middle of the middle chamber in the left-right direction. The structure of the loading beam is specified and standardized.

[0012] Further, both the front sleeve and the rear sleeve are semi-circular hoop clamps. The front sleeve and the rear sleeve are respectively connected to the two-force rod and the servo actuator through connectors. Both connectors include a left side plate. The front end plate and the rear end plate are respectively and perpendicularly fixed to the front and rear ends of the right side surface of the left side plate. The left side surface of the left side plate is fixed to the right end of the two-force rod or the servo actuator. The right end surfaces of the front end plate and the rear end plate are fixedly connected to the corresponding front sleeve or rear sleeve. The structure is specified and standardized, further improving the test accuracy.

[0013] Further, 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, increasing the overall stiffness of the loading beam and ensuring the reliable transmission of torque.

[0014] Furthermore, the outer circumferential surface of the front vertical rotating shaft is coated with polytetrafluoroethylene to ensure the relative rotation between the front vertical rotating shaft and the front sleeve, and the outer circumferential surface of the rear vertical rotating shaft is coated with polytetrafluoroethylene to ensure the relative rotation between the rear vertical rotating shaft and the rear sleeve. In this specific implementation, the normal relative rotation between the front vertical rotating shaft and the front sleeve and the normal relative rotation between the rear vertical rotating shaft and the rear sleeve can also be achieved through the following structure: copper films are attached to the outer circumferential surface of the front vertical rotating shaft, the inner circumferential surface of the front sleeve, the outer circumferential surface of the rear vertical rotating shaft, and the inner circumferential surface of the rear sleeve, and lubricant is applied between the front vertical rotating shaft and the front sleeve and between the rear vertical rotating shaft and the rear sleeve to ensure the normal relative rotation between the front vertical rotating shaft and the front sleeve and between the rear vertical rotating shaft and the rear sleeve.

[0015] Furthermore, the base is of box structure and is fixed to the ground by ground anchors, with stable structure.

[0016] The beneficial effects produced by the present invention are as follows: 1) Through the structural design of the front vertical rotating shaft, the rear vertical rotating shaft, the front sleeve and the rear sleeve, the rotation center positions of the two-force bar 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, and further, the connecting line of the rotation centers of the two-force bar and the servo actuator relative to the loading beam is parallel to the length arrangement direction of the loading beam, thus simplifying the data processing difficulty and improving the test accuracy; 2) The front vertical rotating shaft and the rear vertical rotating shaft adopt the concrete-filled steel tube structure, and the axial jack is arranged directly above the front vertical rotating shaft, so that when the axial pressure load is applied, the axial force can be better transmitted to the engineering structure specimen through the front vertical rotating shaft, reducing the requirement for the stiffness of the loading beam and facilitating the application of a larger axial compression ratio; 3) The volume of the reaction force component is small, and the installation is simple and the adjustment is convenient. Description of the Drawings

[0017] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments in line with the present invention and used together with the specification to explain the principles of the present invention.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic diagram of the overall structure of the device according to the present invention; Figure 2 It is a schematic diagram of the loading beam structure; Figure 3Schematic diagram of the assembly structure of a loading beam, a servo actuator, and a two-force rod Figure 4 Schematic diagram of the assembly structure of a box girder, a rigid splint, a horizontal sliding plate, and an axial jack

[0020] In the figure: 1 - loading beam, 101 - loading cylinder, 102 - vertical partition board, 103 - vertical stiffening plate, 2 - servo actuator, 3 - two-force rod, 4 - reaction wall, 5 - axial jack, 6 - reaction assembly, 601 - box girder, 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 rod, 14 - horizontal sliding plate, 15 - left side plate, 16 - front end plate, 17 - rear end plate, 18 - first front transverse stiffening rib, 19 - second front transverse stiffening rib, 20 - first rear transverse stiffening rib, 21 - second rear transverse stiffening rib. Specific embodiments

[0021] In order to more clearly understand the above objects, features, and advantages of the present invention, the following will further describe the solution of the present invention. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0022] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. It should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

[0023] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present invention, rather than all the embodiments.

[0024] The following will specifically describe the embodiments of the present invention with reference to the accompanying drawings.

[0025] As Figure 1 、 2As shown in the figure, a composite torsion loading test device includes a box-shaped loading beam 1, a servo actuator 2, a two-force bar 3, a reaction wall 4, an axial jack 5, a reaction component 6, and a base 7. The length direction of the loading beam 1 is arranged in the front-rear direction. Two vertical rotating shafts distributed front and rear are fixed inside the loading beam 1, namely the front vertical rotating shaft 8 and the rear vertical rotating shaft 9. The axis connection line of 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. A front sleeve 10 and a rear sleeve 11 are respectively sleeved outside the front vertical rotating shaft 8 and the rear vertical rotating shaft 9. There is a clearance fit between the front sleeve 10 and the front vertical rotating shaft 8, and a clearance fit between the rear sleeve 11 and the rear vertical rotating shaft 9. The two-force bar 3 and the servo actuator 2 are arranged side by side front and rear, and their axes are both arranged in the left-right direction. The left ends of the servo actuator 2 and the two-force bar 3 are both fixed to the reaction wall 4. The right ends of the servo actuator 2 and the two-force bar 3 are respectively fixed to the rear sleeve 11 and the front sleeve 10. 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 member 12.

[0026] Principle description: During the test, the engineering structure member 12 is a member with connecting end plates at both ends. 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, the rear vertical rotating shaft 9, the front sleeve 10 and the rear sleeve 11 inside the loading beam 1, the rotation center positions of the two-force bar 3 and the servo actuator 2 relative to the loading beam 1 become the center positions of the front vertical rotating shaft 8 and the rear vertical rotating shaft 9 respectively. Furthermore, the rotation center connection line of the two-force bar 3 and the servo actuator 2 relative to the loading beam 1 is parallel to the length arrangement direction of the loading beam 1, which is convenient for accurately obtaining the angular displacement data during subsequent torque calculation, simplifies the data processing process, and improves the test accuracy.

[0027] During specific implementation, the front vertical rotating shaft 8 is a concrete-filled steel tube structure, which can withstand large axial pressure loads and is convenient for adapting to test conditions with a large axial compression ratio.

[0028] During specific implementation, the axial jack 5 is arranged directly above the front vertical rotating shaft 8, and the engineering structure member 12 is arranged directly below the front vertical rotating shaft 8, which is convenient for the axial pressure applied by the axial jack 5 to be directly transmitted to the engineering structure specimen through the front vertical rotating shaft 8, effectively reducing the requirement for the stiffness of the loading beam 1 and further meeting the test conditions with a large axial compression ratio.

[0029] In specific implementation, the reaction force assembly 6 includes four long threaded steel bars 602 and a box girder 601 located above the loading beam 1. The length direction of the box girder 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 girder 601, and the bottom ends of the four long threaded steel bars 602 are threadedly connected to corresponding positions on the base 7. The axial jack 5 is located between the bottom surface of the box girder 601 and the loading beam 1. The structure of the reaction force assembly 6 is specific 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.

[0030] In specific implementation, a rigid clamping plate 13 is sleeved on the box girder 601 for left-right sliding. As Figure 4 shown, the rigid clamping plate 13 includes a strip-shaped upper clamping plate 131 whose length direction is arranged along the front-back direction and a strip-shaped lower clamping plate 132 whose length direction is arranged along the front-back direction. The upper clamping plate 131 and the lower clamping plate 132 are respectively located above and below the box girder 601. The upper clamping plate 131 and the lower clamping plate 132 are connected to the box girder 601 through connecting screws 133 and connecting nuts. The bottom surface of the lower clamping plate 132 is provided with a dovetail-shaped rib, and the length arrangement direction of the rib is consistent with the length arrangement direction of the lower clamping plate 132. The top surface of the axial jack 5 is fixed with a horizontal sliding plate 14, and the top surface of the horizontal sliding plate 14 is provided with a dovetail-shaped groove adapted to the rib. The axial jack 5 is slid in the front-back direction through the lower clamping plate 132 and the horizontal sliding plate 14, and the axial jack 5 is moved in the left-right direction through the left-right position of the rigid clamping plate 13 relative to the box girder 601, which is convenient for adjusting the front-back and left-right positions of the axial jack 5 to adapt to the test requirements under different working conditions.

[0031] In specific implementation, the loading beam 1 includes a square loading cylinder 101. The two ends of the loading cylinder 101 are open and arranged towards the left and right respectively. Two vertical partitions 102 are arranged in the loading cylinder 101. The space in the loading cylinder 101 is divided into three chambers from front to back, namely the front chamber, the middle chamber and the rear chamber. The front vertical rotating shaft 8 and the 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 middle chamber in the left-right direction. The structure of the loading beam 1 is specific and standardized.

[0032] In specific implementation, both the front sleeve 10 and the rear sleeve 11 are semi-circular hoop. The front sleeve 10 and the rear sleeve 11 are respectively connected to the two-force rod 3 and the servo actuator 2 through connectors. Both connectors include a left side plate 15. The front and rear ends of the right side surface 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 surface 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. As Figure 3As shown, the structure is specified and standardized to further improve the test accuracy.

[0033] During 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, and 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 the reliable transmission of torque.

[0034] 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. 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. During specific implementation, 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 through the following structure: copper films are attached to 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. 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.

[0035] In this specific embodiment, the base 7 is of a box structure and is fixed to the ground by ground anchors, with a stable structure.

[0036] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Although detailed descriptions have been made with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A composite torsion loading test device, characterized in that It includes a box-shaped loading beam (1), a servo actuator (2), a two-force bar (3), a reaction wall (4), an axial jack (5), a reaction component (6), and a base (7). The length direction of the loading beam (1) is arranged in the front-back direction. Two vertical rotating shafts distributed front and back are fixed in the loading beam (1), namely the front vertical rotating shaft (8) and the rear vertical rotating shaft (9). The axis connection line of 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). A front sleeve (10) and a rear sleeve (11) are respectively sleeved outside the front vertical rotating shaft (8) and the rear vertical rotating shaft (9). There is a clearance fit between the front sleeve (10) and the front vertical rotating shaft (8), and there is a clearance fit between the rear sleeve (11) and the rear vertical rotating shaft (9). The two-force bar (3) and the servo actuator (2) are arranged side by side front and back, and their axes are both arranged in the left-right direction. The left ends of the servo actuator (2) and the two-force bar (3) are both fixed to the reaction wall (4). The right ends of the servo actuator (2) and the two-force bar (3) are respectively fixed to the rear sleeve (11) and the front sleeve (10). The axial jack (5) is installed between the reaction component (6) and the top surface of the loading beam (1). Between the base (7) and the bottom surface of the loading beam (1) is used to install an engineering structure member (12).

2. The composite torsion loading test device according to claim 1, wherein, The front vertical rotating shaft (8) is a concrete-filled steel tube structure.

3. The composite torsion loading test device according to claim 2, wherein, The axial jack (5) is arranged directly above the front vertical rotating shaft (8), and the engineering structure member (12) is arranged directly below the front vertical rotating shaft (8).

4. A composite torsional loading test device according to claim 3, wherein The reaction component (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).

5. A composite torsional loading test device according to claim 4, wherein A rigid clamping plate (13) is slidably sleeved on the box beam (601) left and right. The rigid clamping plate (13) includes a strip-shaped upper clamping plate (131) whose length direction is arranged in the front-back direction and a strip-shaped lower clamping plate (132) whose length direction is arranged in the front-back direction. The upper clamping plate (131) and the lower clamping plate (132) are respectively located above and below the box beam (601). The upper clamping plate (131) and the lower clamping plate (132) are connected to the box beam (601) through connecting screws (133) and connecting nuts. The bottom surface of the lower clamping plate (132) is provided with a dovetail-shaped rib, and the length arrangement direction of the rib is consistent with the length arrangement direction of the lower clamping plate (132). The top surface of the axial jack (5) is fixed with a horizontal sliding plate (14), and the top surface of the horizontal sliding plate (14) is provided with a dovetail-shaped groove adapted to the rib.

6. The composite torsion loading test device according to claim 5, wherein The loading beam (1) includes a square loading cylinder (101). The two ends of the loading cylinder (101) are open and arranged towards the left and right respectively. There are two vertical partitions (102) inside the loading cylinder (101). The two vertical partitions (102) divide the space inside the loading cylinder (101) into three chambers from front to back, namely the front chamber, the middle chamber and the rear chamber. The front vertical rotating shaft (8) and the 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 middle chamber in the left-right direction.

7. A composite torsion loading test device according to claim 6, characterized in that, The front sleeve (10) and the rear sleeve (11) are both semi-circular hoop. The front sleeve (10) and the rear sleeve (11) are respectively connected to the two-force rod (3) and the servo actuator (2) through connectors. Both connectors include a left side plate (15). The front end plate (16) and the rear end plate (17) are respectively and vertically fixed at the front and rear ends of the right side surface of the left side plate (15). The left side surface of the left side plate (15) is fixed to the right end of the two-force rod (3) or the servo actuator (2). 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).

8. A composite torsion loading test device according to claim 7, characterized in that, There is a first front transverse stiffening rib (18) 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). There is a second front transverse stiffening rib (19) 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). There is a first rear transverse stiffening rib (20) 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). There is a second rear transverse stiffening rib (21) 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).

9. A composite torsional loading test device according to claim 8, 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.

10. A composite torsional loading test device according to claim 9, characterized in that, The base (7) is of box-type structure and is fixed to the ground by ground anchors.

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