Pressure-torsion test device and use method thereof

Abstract

The invention provides a pressure-torsion test device and a use method thereof, and belongs to the technical field of building structure tests. In the pressure-torsion test device, a foundation ground beam, a middle main beam and a side main beam are detachably connected with three-in-one stand columns on the two sides respectively; the fixed end of the vertical electro-hydraulic servo loading device is installed on the lower flange of the middle main beam, and the movable end of the vertical electro-hydraulic servo loading device is connected with a pressure loading area on the top of the pressure-torsion loading force arm. The horizontal electro-hydraulic servo loading device is connected with the side main beam through a suspension connecting assembly, the fixed end of the horizontal electro-hydraulic servo loading device is installed on a side stand column of the three-in-one stand column in a central symmetry mode, and the movable end of the horizontal electro-hydraulic servo loading device is connected with the two ends of a pressing-twisting loading force arm. The lower flange of the compression-torsion loading force arm and the upper flange of the foundation ground beam are respectively provided with a test piece installation area. The compression-torsion test device provided by the invention is simple and convenient to mount and operate, the load position can be freely configured according to the size of a test piece, the load provided by the device can be self-balanced, and the defects of the existing compression-torsion test device in data accuracy and operation simplicity and convenience are overcome.

Description

Technical Field

[0001] The present invention belongs to the technical field of building structure testing, and specifically relates to a compression-torsion testing device which is easy to assemble and operate, has free load position configuration, and provides a self-balancing load, and a method for using the device. Background Art

[0002] With the rapid development of the economy and society, the demand for the use of buildings is constantly increasing. Buildings are gradually developing in the direction of large spans and super heights, and performance standards in all aspects are also constantly improving. Natural disasters such as earthquakes and strong winds, as well as explosions and impacts are all actions and load conditions that buildings may encounter. When such situations occur, the stress state of building structures and components is often not a single condition such as axial compression, eccentric compression, compression, and shear, but a complex stress state such as compression and torsion. It can be seen that the complex stress is to enhance the bearing capacity and disaster prevention capabilities of the building structure. Therefore, it is of great significance to conduct compression and torsion stress tests on structural components.

[0003] In actual engineering, structures and components are prone to compression-torsion damage due to external forces such as earthquakes and strong winds, lateral displacement differences caused by irregular building plane shapes, the distance between the center of the building plane stiffness and the center of mass, uneven distribution of building mass or concentration on the periphery, and weak torsional stiffness of the building structure itself. Therefore, experimental research on the compression-torsion performance of structural components plays an important guiding role in the application of related structures and components in actual engineering.

[0004] As the demand for the use of buildings in today's society continues to increase, general reinforced concrete components and single-material steel structure components can no longer fully meet the needs of the project, and new load-bearing components with stronger bearing capacity and more reasonable form and material configuration are needed. At present, the latest new components developed include multi-layer steel tube sandwich concrete components, hollow steel tube sandwich concrete components, steel tube concrete components with internal steel sections, etc., which have the advantages of high bearing capacity, good deformation capacity, convenient construction, and high cost performance. Various tests are urgently needed before practical application to promote their large-scale use in engineering. Considering the complexity of the load state of such heavy-duty components, there are few studies on the compression and torsion performance of such components. It is necessary to conduct corresponding experimental research and analysis and provide data support for theoretical analysis and design standard research. Therefore, it is necessary to carry out innovative research and development of devices and test methods around the experimental research on the compression and torsion performance of building structural components.

[0005] The existing compression-torsion test equipment does not have a relatively standard unified form as a reference for configuration and application. Most of them are devices that combine existing equipment to provide compression-torsion loads. Since each equipment unit is not designed and produced for compression-torsion tests, it is necessary to additionally design and process related connectors and other device units, which increases the test cost; at the same time, due to the temporary nature of the equipment installation, there are certain errors in the realization of compression-torsion loads, the accuracy of test data is difficult to guarantee, and test analysis is more difficult and complicated. Faced with the size requirements of different components, existing devices are generally unable to meet them. There are problems such as the height of the test space cannot be adjusted, the position of the axial compression load and torque is fixed and cannot be freely set, and the device itself cannot balance the applied load, so there is a greater demand for the strength and stiffness of the test environment.

[0006] The patent document with publication number CN111579357A discloses a self-balancing compression-torsion testing device with adjustable height, including a portal steel frame steel column, an adjustable height main beam of the portal steel frame, a bolt group for fastening the portal steel frame, a combined steel frame, an adjustable height torque loading beam, a bolt group for fastening the combined steel frame, a bottom beam fixing device, a test piece with an end plate, a bolt group for fastening the lower end of the test piece, a compression-torsion multi-axis loading arm device, a bolt group for fastening the upper end of the test piece, a vertical electro-hydraulic servo loading device, a horizontal electro-hydraulic servo loading device, and a knife reamer.

[0007] Although the patent document mentions that the compression-torsion test device has the advantage of self-balancing, the portal steel frame steel column, portal steel frame adjustable height main beam and bottom beam fixing device that provide pressure are not connected and fixed, but are connected to the ground or foundation separately. When the vertical hydraulic press is started, the steel column and main beam have a tensile support requirement for the ground or foundation, and the bottom beam has a pressure support requirement for the ground. The entire device does not constitute a self-balancing system in terms of pressure testing; similarly, the combined steel frame and torque loading beam of the torsion system are not connected and fixed to the bottom beam fixing device. When the horizontal hydraulic press is started, the combined steel frame, torque loading beam and bottom beam all have a reverse torque support requirement for the ground or foundation. The entire device does not constitute a self-balancing system in terms of torque testing. Under this structural condition, not only is there redundancy in the overall structural framework, but also the correction and alignment steps that have a significant impact on the test accuracy are added, which increases the complexity and difficulty of the entire installation step.

[0008] Therefore, it is necessary to design a compression-torsion test device and a method for using the device, which is easy to assemble and operate, has free load position configuration, and the load provided by the device can be self-balanced. Summary of the invention

[0009] One of the purposes of the present invention is to provide a compression-torsion test device which is easy to assemble and operate, has free load position configuration, and the load provided by the device can be self-balanced.

[0010] A second object of the present invention is to provide a method for using a compression-torsion testing device which is easy to assemble and operate, has free configuration of load positions, and provides a self-balancing load.

[0011] The technical solution adopted by the present invention to achieve one of the purposes is: to provide a compression-torsion test device, including: two sets of three-in-one columns, a foundation beam, an intermediate main beam, a side main beam, a vertical electro-hydraulic servo loading device, a pair of horizontal electro-hydraulic servo loading devices, and a compression-torsion loading force arm; The three-in-one column includes a column base, a central column installed above the column base, and two side columns; the foundation beam and the column base, the middle main beam and the central column, and the side main beam and the side columns are detachably connected. The fixed end of the vertical electro-hydraulic servo loading device is installed on the lower flange of the middle main beam, and the movable end is connected to the pressure loading area at the top of the compression-torsion loading arm; the fixed end of the horizontal electro-hydraulic servo loading device is installed on the side column of the corresponding three-in-one column in a centrally symmetrical manner, and the movable end is respectively connected to the torque loading areas at both ends of the compression-torsion loading arm. The horizontal electro-hydraulic servo loading device is also connected to the side main beam through a suspension connection assembly; the lower flange of the compression-torsion loading arm and the upper flange of the foundation beam are respectively provided with test piece installation areas.

[0012] In the present invention, the load provided by the compression-torsion test device has the advantage of self-balancing, which is specifically reflected in: On the one hand, the frame structure composed of the test piece to be tested, the compression-torsion loading arm and the vertical electro-hydraulic servo loading device, as well as the external foundation beam, the three-in-one column and the middle main beam forms a self-balancing system of the applied pressure and its reaction force. During the startup of the vertical electro-hydraulic servo loading device, the internal test piece, the compression-torsion loading arm and the vertical electro-hydraulic servo loading device are compressed. Since the external frame structure locks them, the middle column of the three-in-one column is pulled. The pressure on the internal test piece, the compression-torsion loading arm and the vertical electro-hydraulic servo loading device is balanced with the tension on the middle column. This balance is completely completed inside the device system, and no external environment is required to provide support other than the weight of the system.

[0013] On the other hand, the frame structure composed of the test piece to be tested, the compression-torsion loading arm and the horizontal electro-hydraulic servo loading device, as well as the external foundation beam, three-in-one column and side main beam forms a self-balancing system for the applied torque and its reaction force. In the process of starting the horizontal electro-hydraulic servo loading devices on both sides and providing equal forces, equal tension or pressure is generated through the compression-torsion loading arm, thereby generating a torque effect on the test piece. The frame composed of the foundation beam, three-in-one column and side main beam limits the rotation of the test piece in the installation area of ​​the foundation beam, and provides a reaction force at the fixed end of the horizontal electro-hydraulic servo loading device to form an opposite torque. The two parts of torque are in opposite directions and equal in size, achieving balance. This balance is achieved entirely by the system itself, without the need for external environment to provide support other than the weight of the supporting system.

[0014] Based on the above-mentioned structure and connection relationship, the compression and torsion test device provided by the present invention can offset the action force and reaction force in its own frame during the test process in addition to its own gravity. During the test process, there is no need to support the pressure or reverse torque of the ground or foundation other than the weight of the system, thus achieving a true self-balancing effect and ensuring the accuracy and precision of the test results. In addition, the present invention provides a self-balancing of pressure and torque using a common external frame, which not only merges the parts with the same function and simplifies the entire frame system, but also the two parts share a common frame to ensure the precise alignment of the points of action of the pressure part and the torque part. The alignment of the two forces on the action parts can be completed after assembly, without the need for additional correction steps, thus simplifying the operation process.

[0015] Furthermore, in the above-mentioned compression-torsion test device, the foundation ground beam and the column base, the middle main beam and the center column, and the side main beam and the side column are respectively detachably connected, the assembly and operation of the device are more convenient, the connection position can be flexibly adjusted according to the size of the specimen, and the configuration of the load position is also freer.

[0016] Furthermore, in the compression-torsion test device, the horizontal electro-hydraulic servo loading device is also connected to the side main beam via a suspension connection assembly. The provision of the suspension connection assembly can prevent the deadweight of the horizontal electro-hydraulic servo loading device from being transmitted to the specimen via the intermediate component, increasing the axial force of the specimen, and affecting the accuracy of the test load application.

[0017] Furthermore, in the three-in-one column, the central column and the two side columns are installed on the upper flange of the column base by welding.

[0018] Furthermore, the middle main beam and the center column, and the side main beam and the side column are connected and fixed respectively by bolts.

[0019] Furthermore, the basic ground beam is connected to the three-in-one columns on both sides through ground beam connectors.

[0020] Furthermore, the central column and the side columns are provided with a plurality of sets of bolt mounting holes; the intermediate main beam, the side main beam and the horizontal electro-hydraulic servo loading device are installed and fixed according to the size of the sample through bolts and bolt mounting holes that match the height.

[0021] Furthermore, a plurality of gussets are provided between the upper flange and the lower flange of the foundation beam, the middle main beam, the side main beam and the column base. In the present invention, the provision of multiple gussets can enhance the structural rigidity, ensure that no deformation occurs under a large test load, and ensure that the test data is accurate and the test process proceeds smoothly.

[0022] Furthermore, a limit piece is provided on the upper flange of the compression-torsion loading arm, and clamping parts for connecting with the movable ends of the horizontal electro-hydraulic servo loading device are provided at both ends of the compression-torsion loading arm.

[0023] Furthermore, a first mounting hole is provided on the lower flange of the compression-torsion loading arm, and a second mounting hole is provided on the upper flange of the foundation beam.

[0024] Furthermore, the two ends of the specimen are provided with end plates, and during the test, the end plates on both sides of the specimen are respectively fixedly connected to the first mounting hole and the second mounting hole by bolts. In the present invention, the provision of the end plates, on the one hand, facilitates the installation and fixation of the specimen body, and at the same time avoids the lateral displacement of the ends during the test, which causes shear damage to the specimen body, and ensures that the load is effectively transferred to the column member; on the other hand, it can also better simulate the state of the member in the actual project and improve the accuracy of the test.

[0025] Furthermore, the fixed end of the vertical electro-hydraulic servo loading device is connected to the lower flange of the middle main beam through a bolt group; the movable end of the vertical electro-hydraulic servo loading device is provided with a ball joint, and the ball joint is equipped with a ball joint base, and the ball joint base matches the size of the limiter of the compression and torsion loading arm. In the present invention, the setting of the ball joint can concentrate the load in the vertical direction at one point, ensuring that the force center of the axial force loading load diagram is accurately positioned on the axis of the specimen and the direction of the force coincides with the axis.

[0026] Furthermore, the fixed end of the horizontal electro-hydraulic servo loading device is connected to the side column through a bolt group, the fixed end includes a first hinge structure, the hydraulic cylinder loading end end plate of the horizontal electro-hydraulic servo loading device is provided with a suspension mounting hole, and the movable end of the horizontal electro-hydraulic servo loading device includes a second hinge structure, and the end of the movable end is provided with a clamp mounting hole.

[0027] Furthermore, the clamping portion of the compression-torsion loading arm is connected to the fixture mounting hole of the horizontal electro-hydraulic servo loading device via a bolt fixture, and the bolt fixture consists of a connecting plate with screw holes and a bolt group.

[0028] In the horizontal electro-hydraulic servo loading device and its connection relationship provided by the present invention, the first hinge structure arranged at the fixed end of the horizontal electro-hydraulic servo loading device can rotate freely in the vertical plane and slightly in the horizontal direction, and the second hinge structure arranged at the movable end of the horizontal electro-hydraulic servo loading device can rotate freely in the horizontal plane and slightly in the vertical direction. When the test is carried out, whether it is subjected to axial pressure or torsion, the axial size of the specimen will be reduced. The vertical freedom of the fixed end of the horizontal electro-hydraulic servo loading device located at the three-in-one column can avoid the additional and unnecessary axial tension on the specimen when the specimen size is reduced, ensuring the accuracy of the test load application and test data. At the same time, the connection between the horizontal electro-hydraulic servo loading device and the compression-torsion loading arm is locked by a bolt clamp, ensuring that the horizontal force loading point will not move during the test process, ensuring the accuracy of the torque generated; the horizontal freedom of the connection end of the horizontal electro-hydraulic servo loading device and the compression-torsion loading arm satisfies the free rotation of the compression-torsion loading arm when the horizontal force loading point is continuously locked, avoiding the additional and unnecessary lateral tension on the specimen.

[0029] Furthermore, the suspension connection assembly includes a positioning ring, a steel strand and a hanging ear connector. The positioning ring is installed in the suspension mounting hole of the horizontal electro-hydraulic servo loading device. The steel strand is V-shaped and passes through the positioning ring. Both ends are suspended on the lower flange of the side main beam through the hanging ear connectors.

[0030] The technical solution adopted by the present invention to achieve the second purpose is: to provide a method for using the compression-torsion test device according to one of the purposes of the present invention, comprising the following steps: S1. Connect the foundation beam to the column bases of the three-in-one columns on both sides; install the middle main beam and the side main beams on both sides to the appropriate height of the side columns of the three-in-one columns according to the height of the test piece; S2. Fix the fixed end of the vertical electro-hydraulic servo loading device to the lower flange of the middle main beam; suspend the horizontal electro-hydraulic servo loading device under the side main beams on both sides through the suspension connection assembly, and install the fixed end of the horizontal electro-hydraulic servo loading device to a suitable height of the side column, and adjust the fixed end of the horizontal electro-hydraulic servo loading device and the suspension connection assembly to keep the horizontal electro-hydraulic servo loading device horizontal; S3. Fix one end of the specimen to the installation area of ​​the foundation beam; connect the compression-torsion loading arm to the other end of the specimen, and adjust the compression-torsion loading arm to keep it vertical to the foundation beam and the middle main beam in a horizontal position; S4, adjusting the length of the movable end of the horizontal electro-hydraulic servo loading device so that it contacts the compression-torsion loading arm, and connecting it with the clamping parts at both ends of the compression-torsion loading arm through a bolt clamp; adjusting the length of the movable end of the vertical electro-hydraulic servo loading device so that it contacts the pressure loading area at the top of the compression-torsion loading arm; S5. Connect the test instrument, start the vertical electro-hydraulic servo loading device, and apply a predetermined axial compressive load to the specimen; start the horizontal electro-hydraulic servo loading device, and apply a torsional load to the specimen; use the test instrument to continuously detect and record the target parameters until the end of the test.

[0031] Compared with the prior art, the present invention has the following beneficial effects: (1) The compression and torsion test device provided by the present invention, in addition to its own gravity, can offset the action force and reaction force in its own frame during the test. During the test, there is no need to support the pressure or reverse torque on the ground or foundation other than the system's own weight, thus achieving a true self-balancing effect. In addition, the present invention provides a self-balancing of pressure and torque using a common external frame, which not only merges parts with the same function and simplifies the entire frame system, but also ensures that the points of action of the pressure part and the torque part are precisely aligned by sharing a common frame. The alignment of the two forces on the action parts can be completed after assembly, without the need for additional calibration steps, thus simplifying the operation process.

[0032] (2) The compression-torsion test device provided by the present invention is easy to install and operate, the load position can be freely configured according to the size of the specimen, and the load provided by the device can be self-balanced. It overcomes the defects of conventional compression-torsion test devices that the test space is fixed and cannot be adjusted according to the size of the specimen, and that the load requires anchors and reaction devices to provide constraint support, thereby improving the convenience of operation and the accuracy of data collection.

[0033] (3) The compression-torsion test device provided by the present invention can accurately measure the torsional bearing capacity of samples such as multi-layer steel tube sandwich concrete components, hollow steel tube sandwich concrete components, and steel tube concrete components with internal steel sections under axial pressure, providing an important reference basis for the evaluation of the bearing capacity and disaster prevention capacity of building structures, and has broad prospects for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the overall structure of a compression-torsion test device provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a three-in-one column in a compression-torsion test device provided in an embodiment of the present invention; Figure 3 A schematic diagram of the structure of a foundation beam in a compression-torsion test device provided in an embodiment of the present invention; Figure 4 A schematic diagram of the structure of the middle main beam in the compression-torsion test device provided in an embodiment of the present invention; Figure 5 A schematic diagram of the structure of a side main beam in a compression-torsion test device provided in an embodiment of the present invention; Figure 6 A schematic diagram of the structure of a ground beam connecting member in a compression-torsion test device provided in an embodiment of the present invention; Figure 7 A schematic diagram of the structure of a compression-torsion loading arm in a compression-torsion testing device provided in an embodiment of the present invention; Figure 8 A schematic diagram of the structure of a test piece in a compression-torsion test device provided in an embodiment of the present invention; Fig. 9 A schematic structural diagram of a vertical electro-hydraulic servo loading device in a compression-torsion testing device provided in an embodiment of the present invention; Fig.10 A schematic diagram of the structure of a horizontal electro-hydraulic servo loading device in a compression-torsion testing device provided in an embodiment of the present invention; Fig.11 A schematic diagram of the structure of a bolt clamp in a compression-torsion test device provided in an embodiment of the present invention; Fig.12 A schematic diagram of the structure of a suspension connection assembly in a compression-torsion test device provided in an embodiment of the present invention; Among them, 1-three-in-one column; 11-column base; 12-center column; 13-side column; 2-foundation ground beam; 21-ground beam connector; 22-second mounting hole; 3-middle main beam; 4-side main beam; 5-vertical electro-hydraulic servo loading device; 51-ball joint; 52-ball joint base; 6-horizontal electro-hydraulic servo loading device; 61-first hinge structure; 62-hydraulic cylinder loading end plate; 63-suspension mounting hole; 64-second hinge structure; 65-clamp mounting hole; 7-compression and torsion loading arm; 71-limiting piece; 72-clamping part; 73-first mounting hole; 8-suspension connection assembly; 81-positioning ring; 82-steel strand; 83-hanging ear connector; 9-bolt clamp; 91-connecting plate with screw holes; 92-bolt group. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0037] The present invention will be further described below in conjunction with specific embodiments, but the present invention is not limited thereto.

[0038] Example 1 See also Figure 1 and 2 The present embodiment provides a compression-torsion testing device, including two sets of three-in-one columns 1, a foundation beam 2, an intermediate main beam 3, a side main beam 4, a vertical electro-hydraulic servo loading device 5, a pair of horizontal electro-hydraulic servo loading devices 6, and a compression-torsion loading arm 7.

[0039] See also Figure 2 The three-in-one column 1 includes a column base 11, a central column 12 installed above the column base 11, and two side columns 13; the foundation beam 2 and the column base 11, the middle main beam 3 and the central column 12, and the side main beam 4 and the side column 13 are respectively detachably connected; the fixed end of the vertical electro-hydraulic servo loading device 5 is installed on the lower flange of the middle main beam 3, and the movable end is connected to the pressure loading area at the top of the compression-torsion loading arm 7; the fixed end of the horizontal electro-hydraulic servo loading device 6 is centrally symmetrically installed on the corresponding side column of the three-in-one column 1, and the movable end is respectively connected to the torque loading area at both ends of the compression-torsion loading arm 7, and the horizontal electro-hydraulic servo loading device 6 is also connected to the side main beam 4 through a suspension connection assembly 8; the lower flange of the compression-torsion loading arm 7 and the upper flange of the foundation beam 2 are respectively provided with test piece installation areas.

[0040] Furthermore, if Figure 2 As shown, in the three-in-one column 1, the central column 12 and the two side columns 13 are installed on the upper flange of the column base 11 by welding. The basic ground beam 2 and the column base 11, the middle main beam 3 and the central column 12, and the side main beam 4 and the side column 13 are respectively connected and fixed by bolts. Among them, the two ends of the basic ground beam 2 are connected to the three-in-one columns 1 on both sides through the ground beam connector 21 shown in 6.

[0041] Furthermore, the central column 12 and the side column 13 are provided with multiple sets of bolt mounting holes; the middle main beam 3, the side main beam 4 and the horizontal electro-hydraulic servo loading device 6 are installed and fixed according to the size of the specimen through bolts and bolt mounting holes with matching heights. This structural design makes the assembly and operation of the device more convenient, the connection position can be flexibly adjusted according to the size of the specimen, and the configuration of the load position is also more free.

[0042] Furthermore, if Figure 3-5 As shown, a number of gusset plates are provided between the upper flange and the lower flange of the foundation beam 2, the middle main beam 3, the side main beam 4 and the column base 11, which can enhance the structural rigidity, ensure that no deformation occurs under a large test load, and ensure the accuracy of the test data and the smooth progress of the test process.

[0043] like Figure 7 As shown, the upper flange of the compression-torsion loading arm 7 is provided with a limiter 71, which is used to limit the movable end of the vertical electro-hydraulic servo loading device 5 to ensure accurate pressure. Both ends of the compression-torsion loading arm 7 are provided with clamping parts 72 for connecting with the movable end of the horizontal electro-hydraulic servo loading device 6; the lower flange of the compression-torsion loading arm 7 is provided with a first mounting hole 73 for fixing the upper end plate of the loading sample, and correspondingly, the upper flange of the foundation beam 2 is provided with a second mounting hole 22 for fixing the lower end plate of the loading sample. Figure 8 As shown, the two ends of the sample are provided with end plates. During the test, the end plates on both sides of the sample are fixedly connected to the first mounting hole 73 and the second mounting hole 22 by bolts respectively.

[0044] like Fig. 9 As shown, the fixed end of the vertical electro-hydraulic servo loading device 5 is connected to the lower flange of the middle main beam 3 through a bolt group; the movable end of the vertical electro-hydraulic servo loading device 5 is provided with a ball joint 51, and the ball joint 51 is equipped with a ball joint base 52, and the ball joint base 52 matches the size of the limiter 71 of the compression-torsion loading arm 7 to ensure smooth pressure application and pressure transmission.

[0045] like Fig.10 As shown, the fixed end of the horizontal electro-hydraulic servo loading device 6 is connected to the side column 13 through a bolt group, the fixed end includes a first hinge 61, the hydraulic cylinder loading end plate 62 of the horizontal electro-hydraulic servo loading device 6 is provided with a suspension installation hole 63, the movable end of the horizontal electro-hydraulic servo loading device 6 includes a second hinge 64, and the end of the movable end is provided with a fixture installation hole 65. The clamping portion 72 of the compression-torsion loading arm 7 is connected to the fixture installation hole 65 of the horizontal electro-hydraulic servo loading device 6 through a bolt clamp 9, and its structural schematic diagram is shown in FIG. Fig.11 As shown, the bolt clamp 9 is composed of a connecting plate 91 with screw holes and a bolt group 92.

[0046] like Fig.12 As shown, the suspension connection assembly 8 includes a positioning ring 81, a steel strand 82 and a hook connector 83. The positioning ring 81 is installed in the suspension mounting hole 63 of the horizontal electro-hydraulic servo loading device 6. The steel strand 81 is V-shaped, passes through the positioning ring 82, and both ends are suspended on the lower flange of the side main beam 4 through the hook connector 83.

[0047] Based on the above structural design, during the test process of the compression and torsion test device provided by the present invention, the tension or pressure of compression and torsion can complete the offset of the action force and reaction force in its own frame. During the test process, there is no pressure or reverse torque support requirement for the ground or foundation other than the deadweight of the system, thus achieving a true self-balancing effect. In addition, the compression and torsion test device provided by the present invention is easy to install and operate, the load position can be freely configured according to the size of the specimen, and the load provided by the device can be self-balanced, which overcomes the defects of conventional compression and torsion test devices that the test space is fixed and cannot be adjusted with the size of the specimen, and that the load needs to be provided by anchors and reaction devices to provide constraint support, thereby improving the convenience of operation and the accuracy of data collection.

[0048] Example 2 This embodiment provides a method for using the compression-torsion test device in Embodiment 1, comprising the following steps: Step 1: Connect the foundation beam 2 to the column bases 11 of the three-in-one columns 1 on both sides through the beam connectors 21; according to the height of the specimen, use bolts to install the middle main beam 3 and the side main beams 4 on both sides thereof to the appropriate height of the side columns 13 of the three-in-one columns 1; Step 2: The fixed end of the vertical electro-hydraulic servo loading device 5 is fixedly connected to the lower flange of the middle main beam 3 through a bolt group; the horizontal electro-hydraulic servo loading device 6 is suspended under the side main beams 4 on both sides through the steel strands 82 of the suspension connection assembly 8, and the fixed end of the horizontal electro-hydraulic servo loading device 6 is installed to a suitable height of the side column 13 through a bolt group, and the fixed end of the horizontal electro-hydraulic servo loading device 6 and the suspension connection assembly 8 are adjusted to keep the horizontal electro-hydraulic servo loading device 6 horizontal; Step 3: Fixedly connect one end of the specimen to the second mounting hole 22 of the foundation beam 2; connect the first mounting hole 73 of the compression-torsion loading arm 7 to the other end of the specimen, and adjust the compression-torsion loading arm 7 to keep it vertical to the foundation beam 2 and the middle main beam 3 in a horizontal position; Step 4: Adjust the length of the movable end of the horizontal electro-hydraulic servo loading device 6 so that it contacts the compression-torsion loading arm 7, and fix it with the clamping parts 72 at both ends of the compression-torsion loading arm 7 through the bolt clamp 9; adjust the length of the movable end of the vertical electro-hydraulic servo loading device 5 so that it contacts the limit area 71 at the top of the compression-torsion loading arm 7; Step 5: Connect the test instrument, start the vertical electro-hydraulic servo loading device 5, and apply a predetermined axial compressive load to the specimen; start the horizontal electro-hydraulic servo loading device 6, and apply a torsional load to the specimen; use the test instrument to continuously detect and record the target parameters until the test is completed.

[0049] Example 3 The compression-torsion test device provided in Example 1 and the use method provided in Example 2 were used to carry out compression-torsion tests on three steel tube recycled concrete column specimens.

[0050] Among them, the column height of the steel tube recycled concrete column specimen used is 430mm, the diameter is 140mm, and the steel tube wall thickness is 4mm; the top end plate and the bottom end plate are both steel plates with a side length of 290mm, a thickness of 10mm, and a steel grade of Q235. In the steel tube recycled concrete column specimen, the steel tube material properties are shown in Table 1, and the concrete mix ratio and 28-day cubic compressive strength of the steel tube recycled concrete column specimen are shown in Table 2.

[0051] Table 1 Steel pipe material performance test results

[0052] Table 2 Concrete mix ratio

[0053] The compression-torsion test device and the method of use provided by the present invention were used to carry out compression-torsion tests on three steel tube recycled concrete column specimens, and the torsional bearing capacity of the specimen columns was obtained as shown in Table 3. The axial compression ratio refers to the ratio of the axial load applied to the specimen to its ultimate axial compressive bearing capacity.

[0054] Table 3 Torsional bearing capacity of specimens

[0055] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of the specification of the present invention should be included in the protection scope of the present invention.

Claims

1. A compression-torsion test device, characterized in that: include: Two sets of three-in-one columns (1), a foundation beam (2), an intermediate main beam (3), a side main beam (4), a vertical electro-hydraulic servo loading device (5), a pair of horizontal electro-hydraulic servo loading devices (6), and a compression-torsion loading arm (7); The three-in-one column (1) comprises a column base (11), a central column (12) installed above the column base (11), and two side columns (13); the foundation beam (2) and the column base (11), the middle main beam (3) and the central column (12), and the side main beam (4) and the side columns (13) are respectively detachably connected; The fixed end of the vertical electro-hydraulic servo loading device (5) is installed on the lower flange of the middle main beam (3), and the movable end is connected to the pressure loading area at the top of the compression-torsion loading arm (7); The fixed end of the horizontal electro-hydraulic servo loading device (6) is centrally symmetrically mounted on the side column of the corresponding three-in-one column (1), and the movable end is respectively connected to the torque loading areas at both ends of the compression-torsion loading arm (7). The horizontal electro-hydraulic servo loading device (6) is also connected to the side main beam (4) via a suspension connection assembly (8); The lower flange of the compression-torsion loading arm (7) and the upper flange of the foundation beam (2) are respectively provided with test piece installation areas.

2. The compression-torsion test device according to claim 1, characterized in that: In the three-in-one column (1), the central column (12) and the two side columns (13) are mounted on the upper flange of the column base (11) by welding.

3. The compression-torsion testing device according to claim 1, characterized in that: The foundation beam (2) and the column base (11), the intermediate main beam (3) and the central column (12), and the side main beam (4) and the side column (13) are respectively connected and fixed by bolts.

4. The compression-torsion test device according to claim 3, characterized in that: The central column (12) and the side columns (13) are each provided with a plurality of groups of bolt mounting holes; the intermediate main beam (3), the side main beam (4) and the horizontal electro-hydraulic servo loading device (6) are installed and fixed according to the size of the sample through bolts and the bolt mounting holes that match the height.

5. The compression-torsion testing device according to claim 1, characterized in that: The upper flange of the compression-torsion loading arm (7) is provided with a stopper (71), and both ends of the compression-torsion loading arm (7) are provided with clamping portions (72) for connecting to the movable ends of the horizontal electro-hydraulic servo loading device (6); the lower flange of the compression-torsion loading arm (7) is provided with a first mounting hole (73), and the upper flange of the foundation beam (2) is provided with a second mounting hole (22).

6. The compression-torsion test device according to claim 5, characterized in that: The fixed end of the vertical electro-hydraulic servo loading device (5) is connected to the lower flange of the middle main beam (3) via a bolt group; the movable end of the vertical electro-hydraulic servo loading device (5) is provided with a ball joint (51), the ball joint (51) is equipped with a ball joint base (52), and the size of the ball joint base (52) matches that of the limiter (71) of the compression-torsion loading arm (7).

7. The compression-torsion test device according to claim 5, characterized in that: The fixed end of the horizontal electro-hydraulic servo loading device (6) is connected to the side column (13) via a bolt group, the fixed end includes a first hinge (61), a hydraulic cylinder loading end end plate (62) of the horizontal electro-hydraulic servo loading device (6) is provided with a suspension mounting hole (63), the movable end of the horizontal electro-hydraulic servo loading device (6) includes a second hinge structure (64), and a clamp mounting hole (65) is provided at the end of the movable end.

8. The compression-torsion test device according to claim 7, characterized in that: The clamping portion (72) of the compression-torsion loading arm (7) is connected to the fixture mounting hole (65) of the horizontal electro-hydraulic servo loading device (6) via a bolt fixture (9), wherein the bolt fixture (9) is composed of a connecting plate with screw holes (91) and a bolt group (92).

9. The compression-torsion test device according to claim 7, characterized in that: The suspension connection assembly (8) comprises a positioning ring (81), a steel strand (82) and a hook connector (83); the positioning ring (81) is mounted on a suspension mounting hole (63) of a horizontal electro-hydraulic servo loading device (6); the steel strand (81) is V-shaped and passes through the positioning ring (82); and both ends are suspended on the lower flange of the side main beam (4) via the hook connectors (83).

10. A method for using the compression-torsion test device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Connect the foundation beam (2) to the column bases (11) of the three-in-one columns (1) on both sides; install the middle main beam (3) and the side main beams (4) on both sides thereof to the appropriate height of the side columns (13) of the three-in-one columns (1) according to the height of the test piece; S2, the fixed end of the vertical electro-hydraulic servo loading device (5) is fixedly connected to the lower flange of the middle main beam (3); the horizontal electro-hydraulic servo loading device (6) is suspended below the side main beams (4) on both sides through the suspension connection assembly (8), and the fixed end of the horizontal electro-hydraulic servo loading device (6) is installed to a suitable height of the side column (13), and the fixed end of the horizontal electro-hydraulic servo loading device (6) and the suspension connection assembly (8) are adjusted to keep the horizontal electro-hydraulic servo loading device (6) horizontal; S3, fixing one end of the specimen to the installation area of ​​the foundation beam (2); connecting the compression-torsion loading arm (7) to the other end of the specimen, and adjusting the compression-torsion loading arm (7) to keep it vertical to the foundation beam (2) and the middle main beam (3) in a horizontal position; S4, adjusting the length of the movable end of the horizontal electro-hydraulic servo loading device (6) so that it contacts the compression-torsion loading arm (7), and connecting it to the clamping parts (72) at both ends of the compression-torsion loading arm (7) through the bolt clamp (9); adjusting the length of the movable end of the vertical electro-hydraulic servo loading device (5) so that it contacts the pressure loading area at the top of the compression-torsion loading arm (7); S5, connecting the test instrument, starting the vertical electro-hydraulic servo loading device (5), applying a predetermined axial compressive load to the test piece; starting the horizontal electro-hydraulic servo loading device (7), applying a torsional load to the test piece; Use test instruments to continuously detect and record target parameters until the end of the test.

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