A compression-torsion testing device and method of use thereof

Abstract

The application provides a compression-torsion test device and a use method thereof, and belongs to the technical field of building structure test. In the compression-torsion test device, the base beam, the middle main beam and the side main beam are respectively detachably connected with the three-in-one columns on both sides; 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 with the pressure loading area on the top of the compression-torsion loading arm; the horizontal electro-hydraulic servo loading device is connected with the side main beam through the suspension connection assembly, the fixed end is centrally symmetrically installed on the side column of the three-in-one column, and the movable end is respectively connected with the two ends of the compression-torsion loading arm; the lower flange of the compression-torsion loading arm and the upper flange of the base beam are respectively provided with the installation area of the test piece. The compression-torsion test device provided by the application is simple to install and operate, the load position can be freely configured according to the size of the 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 are overcome.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of building structure test, and particularly relates to a compression-torsion test device and a use method thereof, which are convenient to assemble and operate, have free load position configuration, and can provide self-balanced load. BACKGROUND

[0002] With the rapid development of economic society, the use demand for buildings is continuously improved, and buildings are gradually developed in the direction of large span and super high, and the performance standards in all aspects are continuously improved. Earthquakes, strong winds and other natural disasters, explosions, impacts and other events are the action and load conditions that buildings may encounter. In such cases, the stress state of building structures and components is often not a single case of axial compression, eccentric compression, compression, shear and the like, but a complex stress state of compression and torsion. Therefore, it is necessary to improve the bearing capacity and disaster prevention capacity of building structures under complex stress. Therefore, it is of great significance to test the compression-torsion stress of structural components.

[0003] In actual engineering, due to the action of external forces such as earthquakes and strong winds, irregular building plane shape leading to lateral displacement difference, building plane stiffness center far from the mass center, uneven or concentrated building mass distribution at the periphery, and weak torsional stiffness of building structures, structures and components are prone to compression-torsion failure. Therefore, compression-torsion performance test research on structural components has important guiding role for the application of related structures and components in actual engineering.

[0004] With the continuous improvement of the use demand for buildings in today's society, general reinforced concrete components and single-material steel structural components cannot fully meet the engineering requirements, and new bearing components with stronger bearing capacity and more reasonable material configuration are needed. At present, the newly developed new components include multi-layer steel pipe sandwich concrete components, hollow steel pipe sandwich concrete components, steel pipe concrete components with internal steel, etc., which have the advantages of high bearing capacity, good deformation capacity, convenient construction, high cost performance, etc. It is necessary to carry out various tests before actual application to promote its large-scale use in engineering. Considering the complexity of the load state of such heavy load components, there is less research on the compression-torsion performance of such components, and it is necessary to carry out corresponding test research and analysis and provide data support for the research of theoretical analysis and design standards. Therefore, it is necessary to innovate and develop devices and test methods around the compression-torsion performance test research of building structural components.

[0005] The existing compression-torsion test device does not have a relatively standard unified form as a reference for configuration and application, and most of them are formed by combining existing equipment for the purpose of providing compression-torsion load. Since the equipment units are not designed and produced for compression-torsion test, additional design and processing of related connecting parts and other device units are required, which increases the test cost. At the same time, due to the temporary nature of the equipment setup, there is a certain error in the realization of compression-torsion load, and the accuracy of the test data is difficult to guarantee, and the test analysis is more difficult and complex. In the face of different size requirements of components, the existing device also generally cannot meet the requirements, and there are problems such as unadjustable test space height, fixed position of axial compression load and torque, which cannot be freely set, the device itself cannot balance the applied load, and thus has a large demand for the strength and stiffness of the test environment.

[0006] The patent document with publication number CN111579357A discloses an adjustable height self-balancing compression-torsion test device, which includes a portal steel frame type steel column, a portal steel frame adjustable height main beam, a fastening portal steel frame bolt set, a combined steel frame, an adjustable height torque loading beam, a fastening combined steel frame bolt set, a bottom beam fixing device, a test piece with an end plate, a fastening test piece lower end bolt set, a compression-torsion multi-axial loading arm device, a fastening test piece upper end bolt set, a vertical electro-hydraulic servo loading device, a horizontal electro-hydraulic servo loading device, and a knife hinge.

[0007] Although the patent document mentions that the compression-torsion test device has the advantage of self-balancing, the portal steel frame type steel column, the portal steel frame adjustable height main beam, and the bottom beam fixing device provided by the patent document are not connected and fixed, but are connected with the ground or foundation respectively. When the vertical hydraulic machine is started, the steel column and the 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 of the torsion system and the torque loading beam are not connected and fixed with the bottom beam fixing device. When the horizontal hydraulic machine is started, the combined steel frame, the torque loading beam, and the bottom beam all have a reverse torque support requirement for the ground or foundation. The entire device also does not constitute a self-balancing system in terms of torque testing. Under this structural condition, not only is the overall structural framework redundant, but also the steps of correction and alignment, which have a significant impact on test accuracy, are increased, increasing the complexity and difficulty of the entire installation steps.

[0008] Therefore, it is necessary to design a compression-torsion test device and a use method, which are convenient to assemble and operate, have free load position configuration, and have self-balancing load provided by the device. SUMMARY

[0009] One of the purposes of the present application is to provide a compression-torsion test device which is convenient to assemble and operate, has free load position configuration, and has self-balancing load provided by the device.

[0010] The second object of the present application is to provide a method for using the compression-torsion test device which is convenient to assemble and operate, has free load position configuration and provides self-balanced load.

[0011] The technical solution adopted by the present application to achieve one of the objects is to provide a compression-torsion test device, comprising two sets of three-in-one columns, a foundation beam, a middle 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 arm.

[0012] The three-in-one column comprises a column base, a center column mounted above the column base, and two side columns; the foundation beam and the column base, the middle main beam and the center column, and the side main beam and the side columns are respectively detachably connected.

[0013] The fixed end of the vertical electro-hydraulic servo loading device is mounted 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 centrally symmetrically mounted on the side column of the corresponding three-in-one column, and the movable end is respectively connected to the torque loading area 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 mounting areas for test pieces.

[0014] In the present application, the load provided by the compression-torsion test device has the advantage of self-balancing, which is embodied in the following aspects:

[0015] On the one hand, the test piece to be tested, the compression-torsion loading arm and the vertical electro-hydraulic servo loading device, and the external frame structure composed of the foundation beam, the three-in-one column and the middle main beam form a self-balancing system of the applied pressure and its counterforce. 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, and the middle column of the three-in-one column is pulled due to the locking of the external frame structure. The compression of the internal test piece, the compression-torsion loading arm and the vertical electro-hydraulic servo loading device is balanced with the tension of the middle column, and this balance is completely completed within the device system without the need for external environment to provide support other than the weight of the system itself.

[0016] On the other hand, the test piece to be tested, the compression-torsion loading arm and the horizontal electro-hydraulic servo loading device, and the external frame structure composed of the foundation beam, the three-in-one column and the side main beam form a self-balancing system of the applied torque and its counterforce. In the process of starting and providing equal forces by the horizontal electro-hydraulic servo loading device on both sides, equal tension or pressure is generated by the compression-torsion loading arm, thereby generating a torque effect on the test piece. The frame composed of the foundation beam, the three-in-one column and the side main beam restricts the rotation of the test piece in the installation area of the foundation beam and provides a counterforce at the fixed end of the horizontal electro-hydraulic servo loading device, thereby forming an opposite torque. The two parts of torque are opposite in direction and equal in size, and are balanced. This balance is completely achieved by the system itself, without the need for external environment to provide support other than the support of the weight of the system.

[0017] Based on the above structure and connection relationship, the compression-torsion test device provided by the application can realize the balance of the tension or pressure for compression and torsion in the self-contained frame during the test process, and does not require support of pressure or reverse torque on the ground or foundation other than the weight of the system during the test process, thereby achieving a true self-balancing effect and ensuring the accuracy and precision of the test results. In addition, the compression-torsion test device provided by the application shares a whole external frame for pressure and torque, which not only combines the parts with the same effect and simplifies the whole frame system, but also ensures the accurate alignment of the action points of the pressure-providing part and the torque-providing part by sharing a whole frame, so that the alignment of the two force action parts is completed after assembly, without the need for additional correction steps, thereby simplifying the operation process.

[0018] Further, in the compression-torsion test device, the foundation beam and the column base, the intermediate main beam and the center column, and the side main beam and the side column are detachably connected, so that the assembly and operation of the device are more convenient, the connection positions can be flexibly adjusted according to the size of the test piece, and the configuration of the load position is more free.

[0019] Further, in the compression-torsion test device, the horizontal electro-hydraulic servo loading device is further connected to the side main beam through a suspension connection assembly. The suspension connection assembly can prevent the weight of the horizontal electro-hydraulic servo loading device from being transmitted to the test piece through the intermediate part, thereby increasing the axial force of the test piece and affecting the accuracy of the test load application.

[0020] Further, in the three-in-one column, the center column and the two side columns are welded to the upper flange of the column base.

[0021] Further, the intermediate main beam and the center column, and the side main beam and the side column are connected and fixed by bolts, respectively.

[0022] Further, the foundation ground beam is connected with the three-in-one columns on both sides through a ground beam connector.

[0023] Further, the central column and the side column are each provided with a plurality of bolt mounting holes; the middle main beam, the side main beam and the horizontal electro-hydraulic servo loading device are installed and fixed through bolts and bolt mounting holes with matching heights according to the size of the sample.

[0024] Further, a plurality of patch plates are arranged between the upper flanges and the lower flanges of the foundation ground beam, the middle main beam, the side main beam and the column base. In the present application, the arrangement of the plurality of patch plates 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 is smooth.

[0025] Further, the upper flange of the compression-torsion loading arm is provided with a limiting piece, and the two ends of the compression-torsion loading arm are provided with clamping parts for connecting with the movable ends of the horizontal electro-hydraulic servo loading device.

[0026] Further, the lower flange of the compression-torsion loading arm is provided with a first mounting hole, and the upper flange of the foundation ground beam is provided with a second mounting hole.

[0027] Further, the two ends of the sample are provided with end plates, and the end plates on both sides of the sample are respectively fixedly connected with the first mounting hole and the second mounting hole through bolts during the test. In the present application, the arrangement of the end plates helps to install and fix the main body of the sample, avoids the occurrence of transverse displacement of the end part during the test to cause shear failure of the main body of the sample, ensures that the load is effectively transmitted to the column member, and better simulates the state of the member in the actual engineering, thereby improving the accuracy of the test.

[0028] Further, the fixed end of the vertical electro-hydraulic servo loading device is connected with the lower flange of the middle main beam through a bolt set; the movable end of the vertical electro-hydraulic servo loading device is provided with a spherical hinge, the spherical hinge is provided with a spherical hinge base, and the spherical hinge base is matched in size with the limiting piece of the compression-torsion loading arm. In the present application, the arrangement of the spherical hinge can concentrate the load in the vertical direction at a point, and ensure that the force center of the axial force loading load pattern is accurately positioned on the sample axis and the direction of the force coincides with the axis.

[0029] Further, the fixed end of the horizontal electro-hydraulic servo loading device is connected with the side column through a bolt set, and the fixed end includes a first hinge structure; the end plate of the hydraulic cylinder loading end of the horizontal electro-hydraulic servo loading device is provided with a suspension mounting hole; the movable end of the horizontal electro-hydraulic servo loading device includes a second hinge structure, and the end part of the movable end is provided with a clamp mounting hole.

[0030] Further, the clamping part of the compression-torsion loading arm and the clamp mounting hole of the horizontal electro-hydraulic servo loading device are connected through a bolt clamp, and the bolt clamp is composed of a bolt hole connecting plate and a bolt set.

[0031] In the horizontal electro-hydraulic servo loading device and the connecting relationship thereof provided by the application, the first hinge structure arranged at the fixed end of the horizontal electro-hydraulic servo loading device can freely rotate in the vertical plane and slightly rotate in the horizontal direction, and the second hinge structure arranged at the movable end of the horizontal electro-hydraulic servo loading device can freely rotate in the horizontal plane and slightly rotate in the vertical direction. When the test is carried out, the test piece will be reduced in axial size whether in the process of being subjected to axial pressure or being subjected to torsion, and the freedom degree of the horizontal electro-hydraulic servo loading device at the fixed end of the three-in-one column in the vertical direction can avoid the test piece from generating additional and unnecessary axial tension when the size of the test piece is reduced, thereby ensuring the accuracy of the test load application and test data. Meanwhile, the connection between the horizontal electro-hydraulic servo loading device and the compression-torsion loading arm is locked by a bolt clamp, so that the horizontal force loading point will not move during the test, thereby ensuring the accuracy of the generated torque; and the freedom degree of the connection end of the horizontal electro-hydraulic servo loading device in the horizontal direction meets the free rotation of the compression-torsion loading arm under the condition that the horizontal force loading point is continuously locked, thereby avoiding the test piece from generating additional and unnecessary lateral tension.

[0032] Further, the suspension connecting assembly comprises a positioning ring, a steel strand and a lug connecting piece, the positioning ring is installed in the suspension mounting hole of the horizontal electro-hydraulic servo loading device, the steel strand is in a V shape, passes through the positioning ring and is suspended on the lower flange of the side main beam through the lug connecting piece at both ends.

[0033] The second purpose of the application is achieved by the technical scheme that a use method of the compression-torsion test device according to the first purpose of the application is provided, and the use method comprises the following steps:

[0034] S1, connecting the foundation beam with the column bases of the three-in-one columns on both sides; according to the height of the test piece, installing 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;

[0035] S2, fixedly connecting the fixed end of the vertical electro-hydraulic servo loading device with the lower flange of the middle main beam; suspending the horizontal electro-hydraulic servo loading device below the side main beams on both sides through the suspension connecting assembly, installing the fixed end of the horizontal electro-hydraulic servo loading device to the appropriate height of the side columns and adjusting the fixed end of the horizontal electro-hydraulic servo loading device and the suspension connecting assembly to keep the horizontal electro-hydraulic servo loading device horizontal;

[0036] S3, fixedly connecting one end of the test piece with the mounting area of the foundation beam; connecting the compression-torsion loading arm with the other end of the test piece and adjusting the compression-torsion loading arm to keep it vertical to the foundation beam and the middle main beam in the horizontal position;

[0037] S4, adjust the length of the movable end of the horizontal electro-hydraulic servo loading device, so that it is in contact with the torsion loading arm, and is connected to the clamping portions at the two ends of the torsion loading arm through the bolt clamps; adjust the length of the movable end of the vertical electro-hydraulic servo loading device, so that it is in contact with the pressure loading area at the top of the torsion loading arm;

[0038] S5, connect the test instrument, start the vertical electro-hydraulic servo loading device, and apply a predetermined axial compression load to the test piece; start the horizontal electro-hydraulic servo loading device, and apply a torsional load to the test piece; continuously detect and record the target parameters by using the test instrument until the test is completed.

[0039] Compared with the prior art, the beneficial effects of the present application are:

[0040] (1) The torsion-compression test device provided by the present application can realize the self-balancing effect in a true sense, because the tension or pressure of the compression and torsion can complete the compensation of the action force and the reaction force in the self-frame during the test process, and there is no support requirement for the ground or foundation except the self-weight of the system during the test process.

[0041] (2) The torsion-compression test device provided by the present application is simple to install and operate, the load position can be freely configured according to the size of the test piece, and the load provided by the device can be self-balanced, which overcomes the defects of the conventional torsion-compression test device that the test space is fixed and cannot be adjusted according to the size of the test piece, and the load provided by the device needs to be supported by the ground anchor and the reaction device, thereby improving the convenience of operation and the accuracy of data collection.

[0042] (3) The torsion-compression test device provided by the present application can accurately measure the torsional bearing capacity of multi-layer steel pipe sandwich concrete members, hollow steel pipe sandwich concrete members, steel pipe concrete members with internal steel, and other samples under axial compression, which provides an important reference for the evaluation of the bearing capacity and disaster prevention ability of building structures, and has a wide application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 The overall structure schematic diagram of the torsion-compression test device provided by the embodiment of the present application is shown in the figure;

[0044] Figure 2 The structure schematic diagram of the three-in-one column in the torsion-compression test device provided by the embodiment of the present application is shown in the figure;

[0045] Figure 3 A structural schematic view of a foundation beam in a compression-torsion test device provided by an embodiment of the present application is shown in FIG. 1.

[0046] Figure 4 A structural schematic view of an intermediate main beam in a compression-torsion test device provided by an embodiment of the present application is shown in FIG. 2.

[0047] Figure 5 A structural schematic view of a side main beam in a compression-torsion test device provided by an embodiment of the present application is shown in FIG. 3.

[0048] Figure 6 A structural schematic view of a ground beam connecting piece in a compression-torsion test device provided by an embodiment of the present application is shown in FIG. 4.

[0049] Figure 7 A structural schematic view of a compression-torsion loading arm in a compression-torsion test device provided by an embodiment of the present application is shown in FIG. 5.

[0050] Figure 8 A structural schematic view of a test piece in a compression-torsion test device provided by an embodiment of the present application is shown in FIG. 6.

[0051] Figure 9 A structural schematic view of a vertical electro-hydraulic servo loading device in a compression-torsion test device provided by an embodiment of the present application is shown in FIG. 7.

[0052] Figure 10 A structural schematic view of a horizontal electro-hydraulic servo loading device in a compression-torsion test device provided by an embodiment of the present application is shown in FIG. 8.

[0053] Figure 11 A structural schematic view of a bolt clamp in a compression-torsion test device provided by an embodiment of the present application is shown in FIG. 9.

[0054] Figure 12 A structural schematic view of a suspension connecting assembly in a compression-torsion test device provided by an embodiment of the present application is shown in FIG. 10.

[0055] In the drawings: 1 - three-in-one column; 11 - column base; 12 - central column; 13 - side column; 2 - foundation beam; 21 - beam connecting piece; 22 - second mounting hole; 3 - intermediate main beam; 4 - side main beam; 5 - vertical electro-hydraulic servo loading device; 51 - spherical hinge; 52 - spherical hinge base; 6 - horizontal electro-hydraulic servo loading device; 61 - first hinge structure; 62 - hydraulic cylinder loading end end plate; 63 - suspension mounting hole; 64 - second hinge structure; 65 - clamp mounting hole; 7 - compression-torsion loading arm; 71 - limiting piece; 72 - clamping portion; 73 - first mounting hole; 8 - suspension connecting assembly; 81 - positioning ring; 82 - steel strand; 83 - ear connecting piece; 9 - bolt clamp; 91 - screw hole connecting plate; 92 - bolt set. DETAILED DESCRIPTION

[0056] The technical solutions of the present application will be described clearly and completely below in connection with the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0057] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0058] The present application will be further described below in connection with specific embodiments, but not as a limitation of the present application.

[0059] Embodiment 1

[0060] Please refer to Figure 1 and 2 , the present embodiment provides a compression-torsion test device, which comprises two groups of three-in-one columns 1, a foundation beam 2, a middle 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.

[0061] Please refer to Figure 2 , the three-in-one column 1 comprises a column base 11, a center column 12 mounted 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 center 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 mounted on the lower flange of the middle main beam 3, and the movable end is connected to the compression 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 area 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 through a suspension connecting 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 a mounting area of a test piece.

[0062] Further, as shown in Figure 2 , in the three-in-one column 1, the center column 12 and the two side columns 13 are mounted on the upper flange of the column base 11 in a welded manner. The foundation beam 2 and the column base 11, the middle main beam 3 and the center 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 foundation beam 2 are connected with the two three-in-one columns 1 on the sides through the beam connecting pieces 21 as shown in 6.

[0063] Further, the center column 12 and the side column 13 are provided with multiple groups 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 by bolts and the bolt mounting holes with matched height according to the size of the test sample. The structure design makes the assembly and operation of the device more convenient, the connection position can be flexibly adjusted according to the size of the test sample, and the configuration of the load position is also more free.

[0064] Further, as shown in the figure, Figures 3-5 The upper flange and the lower flange of the base beam 2, the middle main beam 3, the side main beam 4 and the column base 11 are provided with a plurality of patch plates, which can enhance the structural stiffness, ensure that no deformation occurs under a large test load, and ensure that the test data is accurate and the test process is smooth.

[0065] As shown in the figure, Figure 7 The upper flange of the compression-torsion loading arm 7 is provided with a limiting piece 71 for limiting the movable end of the vertical electro-hydraulic servo loading device 5 to ensure accurate pressure. The two 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 test sample. Correspondingly, the upper flange of the base beam 2 is provided with a second mounting hole 22 for fixing the lower end plate of the loading test sample. As shown in the figure, Figure 8 The two ends of the test sample are provided with end plates, and the end plates on both sides of the test sample are fixed and connected by bolts with the first mounting hole 73 and the second mounting hole 22 respectively during the test process.

[0066] As shown in the figure, Figure 9 The fixed end of the vertical electro-hydraulic servo loading device 5 is connected with 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 spherical hinge 51, the spherical hinge 51 is provided with a spherical hinge base 52, the spherical hinge base 52 is matched in size with the limiting piece 71 of the compression-torsion loading arm 7 to ensure smooth pressure and pressure transmission.

[0067] As shown in the figure, Figure 10 The fixed end of the horizontal electro-hydraulic servo loading device 6 is connected with the side column 13 through a bolt group, and the fixed end includes a first hinge structure 61. The hydraulic cylinder loading end plate 62 of the horizontal electro-hydraulic servo loading device 6 is provided with a suspension mounting hole 63, and the movable end of the horizontal electro-hydraulic servo loading device 6 includes a second hinge structure 64, and the end of the movable end is provided with a clamp mounting hole 65. The clamping part 72 of the compression-torsion loading arm 7 is connected with the clamp mounting hole 65 of the horizontal electro-hydraulic servo loading device 6 through a bolt clamp 9, and the structural diagram is shown in the figure. Figure 11 The bolt clamp 9 is composed of a bolt hole connecting plate 91 and a bolt group 92.

[0068] As shown in the figure, Figure 12As shown, the suspension connecting assembly 8 comprises a positioning ring 81, a steel strand 82 and a lug connecting piece 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 82 is in a V shape, passes through the positioning ring 81 and is suspended on the lower flange of the side main beam 4 through the lug connecting piece 83 at both ends.

[0069] Based on the above structure design, the compression-torsion test device provided by the present application can realize the compensation of the action force and the reaction force in the self frame during the test process of the compression-torsion test device, and the compression-torsion test device does not have the support demand of the pressure or the reverse torque on the ground or the foundation except the self weight during the test process, so that the self-balancing effect in the true sense is realized. In addition, the compression-torsion test device provided by the present application is simple to install and operate, the load position can be freely configured according to the size of the test piece, and the load provided by the device can be self-balanced, so that the defects of the conventional compression-torsion test device, such as the fixed test space, the inability to adjust the test space according to the size of the test piece, the need of the ground anchor to provide the load and the reaction device to provide the constraint support, are overcome, and the convenience of operation and the accuracy of data acquisition are improved.

[0070] Embodiment 2

[0071] The present embodiment provides a use method of the compression-torsion test device in embodiment 1, which comprises the following steps:

[0072] Step 1: connecting the foundation ground beam 2 with the column base 11 of the three-in-one column 1 on both sides through the ground beam connecting piece 21; according to the height of the test piece, installing the middle main beam 3 and the side main beam 4 on both sides of the middle main beam 3 to the appropriate height of the side column 13 of the three-in-one column 1 by using the bolt set;

[0073] Step 2: fixedly connecting the fixed end of the vertical electro-hydraulic servo loading device 5 with the lower flange of the middle main beam 3 through the bolt set; suspending the horizontal electro-hydraulic servo loading device 6 below the side main beam 4 on both sides through the steel strand 82 of the suspension connecting assembly 8, and installing the fixed end of the horizontal electro-hydraulic servo loading device 6 to the appropriate height of the side column 13 through the bolt set, and adjusting the fixed end of the horizontal electro-hydraulic servo loading device 6 and the suspension connecting assembly 8 to keep the horizontal electro-hydraulic servo loading device 6 horizontal;

[0074] Step 3: fixedly connecting one end of the test piece with the second mounting hole 22 of the foundation ground beam 2; connecting the first mounting hole 73 of the compression-torsion loading arm 7 with the other end of the test piece, and adjusting the compression-torsion loading arm 7 to keep it vertical with the foundation ground beam 2 and the middle main beam 3 in the horizontal position;

[0075] Step 4: adjust the length of the active end of the horizontal electro-hydraulic servo loading device 6 to be in contact with the compression-torsion loading arm 7, and fixedly connected with the clamping portions 72 at both ends of the compression-torsion loading arm 7 through the bolt clamps 9; adjust the length of the active end of the vertical electro-hydraulic servo loading device 5 to be in contact with the limiting piece 71 at the top of the compression-torsion loading arm 7;

[0076] Step 5: connect the test instrument, start the vertical electro-hydraulic servo loading device 5 to apply a predetermined axial compression load to the test piece; start the horizontal electro-hydraulic servo loading device 6 to apply a torsional load to the test piece; continuously detect and record the target parameters by using the test instrument until the test is completed.

[0077] Example 3

[0078] Three steel pipe recycled concrete column test pieces were subjected to compression-torsion tests by using the compression-torsion test device provided in Example 1 and the use method provided in Example 2.

[0079] Among them, the column height of the steel pipe recycled concrete column test piece is 430mm, the diameter is 140mm, and the steel pipe 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. The material properties of the steel pipe in the steel pipe recycled concrete column test piece are shown in Table 1, and the concrete mix proportion and 28-day cube compressive strength of the steel pipe recycled concrete column test piece are shown in Table 2.

[0080] Table 1: Test results of steel pipe material properties

[0081]

[0082] Table 2: Concrete mix proportion

[0083]

[0084] Three steel pipe recycled concrete column test pieces were subjected to compression-torsion tests by using the compression-torsion test device provided in the application and the use method provided in the application, and the torsional bearing capacity of the test piece column is shown in Table 3. Among them, the axial compression ratio refers to the ratio of the axial load applied to the test piece to the ultimate axial compressive bearing capacity.

[0085] Table 3: Torsional bearing capacity of test piece

[0086]

[0087] The above is only the preferred embodiment of the application, and does not limit the implementation and protection scope of the application. For those skilled in the art, it should be realized that any equivalent replacement and obvious changes made by using the content of the application should be included in the protection scope of the application.

Claims

1. A compression-torsion testing device, characterized by comprising: The application relates to a three-in-one column (1), a foundation beam (2), a middle 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 force arm (7). The three-in-one column (1) comprises a column base (11), a central column (12) arranged above the column base (11) and two side columns (13); the foundation beam (2) is detachably connected with the column base (11), the middle main beam (3) is detachably connected with the central column (12), and the side main beam (4) is detachably connected with the side columns (13). The fixed end of the vertical electro-hydraulic servo loading device (5) is arranged on the lower flange of the middle main beam (3), and the movable end is connected with the compression loading area at the top of the compression-torsion loading force arm (7). The fixed end of the horizontal electro-hydraulic servo loading device (6) is arranged on the side column (13) of the corresponding three-in-one column (1) in a central symmetry mode, the movable end is connected with the torque loading area at the two ends of the compression-torsion loading force arm (7), and the horizontal electro-hydraulic servo loading device (6) is further connected with the side main beam (4) through a suspension connecting assembly (8). The lower flange of the compression-torsion loading force arm (7) and the upper flange of the foundation beam (2) are respectively provided with the mounting areas of test pieces. The fixed end of the horizontal electro-hydraulic servo loading device (6) is connected with the side column (13) through a bolt group, the fixed end comprises a first hinge structure (61), the hydraulic cylinder loading 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) comprises a second hinge structure (64), and the end of the movable end is provided with a clamp mounting hole (65). The suspension connecting assembly (8) comprises a positioning ring (81), a steel wire (82) and a lug connecting piece (83), the positioning ring (81) is arranged on the suspension mounting hole (63) of the horizontal electro-hydraulic servo loading device (6), the steel wire (82) is in a V-shaped mode, passes through the positioning ring (81) and is suspended on the lower flange of the side main beam (4) through the lug connecting pieces (83) at two ends. In the three-in-one column (1), the central column (12) and the two side columns (13) are arranged on the upper flange of the column base (11) in a welding mode.

2. The press-tension device of claim 1, wherein 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 connected and fixed through bolts.

3. The press-tension device of claim 1, wherein The central column (12) and the side columns (13) are respectively provided with a plurality 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 through bolts and height-matched bolt mounting holes according to the size of the test piece.

4. The press-tension device of claim 3, wherein The upper flange of the compression-torsion loading force arm (7) is provided with a limiting piece (71), the two ends of the compression-torsion loading force arm (7) are provided with clamping portions (72) for being connected with the movable ends of the horizontal electro-hydraulic servo loading devices (6); the lower flange of the compression-torsion loading force 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).

5. The press-tension device of claim 1, wherein ​ 6. The press-tension device of claim 5, wherein The fixed end of the vertical electro-hydraulic servo loading device (5) is connected with the lower wing of the intermediate main beam (3) through a bolt set; the movable end of the vertical electro-hydraulic servo loading device (5) is provided with a spherical hinge (51), the spherical hinge (51) is provided with a spherical hinge base (52), and the spherical hinge base (52) is matched in size with the limiting piece (71) of the compression-torsion loading arm (7).

7. The press-tension device of claim 5, wherein The clamping part (72) of the compression-torsion loading arm (7) is connected with the clamp mounting hole (65) of the horizontal electro-hydraulic servo loading device (6) through a bolt clamp (9), and the bolt clamp (9) is composed of a bolt hole connecting plate (91) and a bolt set (92).

8. A method of using a press-tension interfacemeter according to any one of claims 1-7, characterized by, The method comprises the following steps: S1, connecting the base ground beam (2) with the column base (11) of the three-in-one column (1) on both sides; according to the height of the test piece, the intermediate main beam (3) and the side main beams (4) on both sides are installed to the appropriate height of the side columns (13) of the three-in-one column (1); S2, fixing the fixed end of the vertical electro-hydraulic servo loading device (5) to the lower wing of the intermediate main beam (3); suspending the horizontal electro-hydraulic servo loading device (6) below the side main beams (4) on both sides through the suspension connection assembly (8), and installing the fixed end of the horizontal electro-hydraulic servo loading device (6) to the appropriate height of the side columns (13), and adjusting the fixed end of the horizontal electro-hydraulic servo loading device (6) and the suspension connection assembly (8) to keep the horizontal electro-hydraulic servo loading device (6) horizontal; S3, fixing one end of the test piece to the installation area of the base ground beam (2); connecting the compression-torsion loading arm (7) to the other end of the test piece, and adjusting the compression-torsion loading arm (7) to keep it vertical to the base ground beam (2) and the intermediate main beam (3) in the horizontal position; S4, adjusting the length of the movable end of the horizontal electro-hydraulic servo loading device (6) to make it contact with the compression-torsion loading arm (7), and connecting the two ends of the compression-torsion loading arm (7) through the bolt clamp (9) and the clamping part (72); adjusting the length of the movable end of the vertical electro-hydraulic servo loading device (5) to make it contact with 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), and applying a predetermined axial compression load to the test piece; starting the horizontal electro-hydraulic servo loading device (6) and applying a torsional load to the test piece; The target parameters are continuously detected and recorded by the test instrument until the test is completed.

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