A synchronous load testing device and method for a steel pipe concrete column structure joint

Abstract

The present application relates to the technical fields of building structure detection, and discloses a steel pipe concrete column structure node synchronous load test device and method, which comprises a test device and a loading device; the test device comprises a support frame, which is a tripod; a first corner of the support frame is attached to a steel pipe concrete column; a pressing block is arranged on a second corner of the support frame directly above the first corner; the pressing block can be pressed against a steel bracket located at a node of the steel pipe concrete column and a concrete beam; a test band that can be wrapped around the steel pipe concrete column is further arranged above the second corner of the support frame; and the loading device is installed on an inclined edge of the support frame opposite to the second corner and can be adjusted in position on the inclined edge of the support frame. The test device transmits and distributes test loads to the steel bracket and the test band through the support frame, so that the steel bracket and the test band are in different stress states, and then the deformation characteristics or the load limit that can be borne by the steel bracket and the steel pipe concrete column at the node under different stress states are synchronously tested.

Description

Technical Field

[0001] This invention relates to the field of building structure testing technology, specifically to a synchronous load testing device and method for steel-concrete composite column structure nodes. Background Technology

[0002] In building structures, concrete-filled steel tubular (CFST) columns are widely used in high-rise buildings, bridges, and other projects due to their excellent load-bearing capacity and seismic performance. To ensure structural safety, load tests must be conducted on CFST columns and their connecting joints (such as flexural brackets). Traditional testing methods typically use hydraulic jacks or counterweights to apply force, which is complex to operate, requires multiple adjustments to the force application position, and necessitates multiple connections between the testing device and the CFST column. This results in low efficiency and difficulty in simultaneously testing the stress performance of the CFST column and its connecting joints. Traditional testing methods cannot simultaneously perform lateral and longitudinal loading; they are generally applied separately. Therefore, they cannot simulate actual conditions and can only provide lateral and longitudinal loading data for reference only. This is not as accurate as simultaneous loading, which closely reflects actual conditions, and thus has limited application value.

[0003] Therefore, there is an urgent need for a load testing device to simultaneously test the stress performance of steel corbels at the joints of concrete-filled steel tube columns and concrete beams, so as to improve testing efficiency and accuracy. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a synchronous load testing device and method for steel-concrete composite column structure joints, to simultaneously test the stress performance of the steel-concrete composite column and its connection joints.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] In a first aspect, the present invention provides a synchronous load testing device for a steel-concrete composite column structure joint, comprising a testing device and a loading device; the testing device includes a support frame, which is a triangular frame, with a first corner of the support frame abutting against the steel-concrete composite column, and a pressure block provided on a second corner of the support frame located directly above the first corner, the pressure block being able to press against the steel bracket located at the joint between the steel-concrete composite column and the concrete beam; a test band that can be fitted onto the steel-concrete composite column is also provided above the second corner of the support frame; the loading device is installed on the inclined side of the support frame opposite to the second corner, and its position on the inclined side of the support frame is adjustable.

[0007] Based on the above scheme, a force triangle is formed between the support frame, the steel-concrete composite column, and the test strip + pressure block. When the support frame is pulled downward by the loading device, the lower end of the support frame acts as a fulcrum, and the test load acts on the upper part of the steel-concrete composite column through the test strip, while simultaneously acting on the steel bracket through the pressure block. By adjusting the load application position of the loading device on the inclined side of the support frame, synchronous load tests on the steel-concrete composite column and its concrete beam joint under different stress states can be achieved. When the load application position of the loading device moves along the inclined side of the support frame towards the steel-concrete composite column, the test load acting on the test strip gradually decreases, and the test load acting on the pressure block gradually increases; conversely, the test load acting on the test strip gradually increases, and the test load acting on the pressure block gradually decreases.

[0008] As a preferred embodiment, the support frame includes a vertical support portion whose lower end abuts against a steel-concrete composite column, an oblique adjustment portion connected to the lower end of the vertical support portion to form a first corner, and a transverse connecting portion connected to the upper end of the vertical support portion to form a second corner. The oblique adjustment portion is connected to the transverse connecting portion to form a third corner. The oblique adjustment portion is an oblique side opposite to the second corner and has several limiting holes along its length.

[0009] As a preferred embodiment, the angle of the second corner is 60°-120°, preferably 90°; the angle of the inclined adjustment part relative to the axis of the steel tube concrete column is 30°-60°.

[0010] As a preferred embodiment, the loading device includes a loading arm and a vertically lifting loading platform. One end of the upper surface of the loading platform is provided with a support rod, and the other end is provided with a linear actuator. One end of the loading arm is hinged to the output end of the linear actuator, the middle part is hinged to the end of the support rod, and the other end is hinged to a connecting component. The upper end of the connecting component is detachably fixedly installed on the inclined adjustment part of the support frame. The length of the power arm of the loading arm is greater than or equal to the length of the resistance arm.

[0011] As a preferred embodiment, the connecting assembly includes a connecting rod hinged to the other end of the loading arm and a slider hinged to the upper end of the connecting rod. The slider is provided with a fastener that can be inserted into a limiting hole. The fastener can be a limiting bolt or a limiting pin.

[0012] As a preferred embodiment, a mounting base for fixing the test belt is also provided above the second corner of the support frame.

[0013] As a preferred embodiment, a mobile trolley is also included, wherein several telescopic hydraulic cylinders are provided on the top of the mobile trolley and connected to the bottom of the loading platform, so that the loading platform can be raised and lowered vertically.

[0014] As a preferred embodiment, the bottom of the mobile trolley is also provided with a mobile support, the mobile support is provided with a set of mobile wheels, and a pair of support components are provided on both sides of the mobile trolley to allow the mobile trolley to move up and down relative to the mobile support.

[0015] As a preferred embodiment, the support assembly includes a fixed bracket mounted on the mobile trolley, a drive motor mounted on the fixed bracket, and a lifting screw mounted on the output shaft of the drive motor and screwed to the mobile bracket.

[0016] Secondly, the present invention provides a method for synchronous load testing of steel-tube column concrete structure joints, using the aforementioned synchronous load testing device for steel-tube column concrete structure joints, comprising the following steps:

[0017] Install the support frame so that the pressure block presses against the steel bracket located at the joint between the steel tube concrete column and the concrete beam, and so that the test belt is hooped on the steel tube concrete column above the steel bracket.

[0018] Install the loading device at any position on the inclined side of the support frame;

[0019] The loading device applies a downward load to the inclined side of the support frame, and simultaneously tests the load limit of the steel-concrete composite column and the steel bracket at the joint of the steel-concrete composite column structure, or simultaneously tests the load-deformation law of the steel-concrete composite column and the steel bracket.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1) This invention tests the load limit of the steel bracket and the steel-concrete composite column at the joint position of the steel-concrete composite column by pressing the pressure block against the steel bracket and the test strip being sleeved on the steel-concrete composite column. The test load is transferred and distributed to the steel bracket and the test strip through the triangular support frame, so that the steel bracket and the test strip can be in different stress states. The combined stress state of the steel-concrete composite column and the concrete beam joint is that there are both lateral and longitudinal forces. Thus, the deformation characteristics or the load limit that the steel bracket and the steel-concrete composite column can withstand under different stress states can be tested simultaneously to meet the requirements of different working conditions.

[0022] 2) This invention uses a linear actuator to drive the loading arm, simultaneously applying force to the upper part of the steel-concrete composite column (via the test strip) and the steel bracket (via the pressure block), enabling two tests to be completed in one loading operation without the need for multiple operations, thus effectively improving testing efficiency;

[0023] 3) The inclined adjustment part of the support frame is equipped with a limiting hole, which can precisely control the position of the test load applied through the connecting components, thereby dynamically distributing the force ratio between the steel pipe concrete column and the steel bracket. The connection position of the connecting components can be adjusted according to the actual test requirements.

[0024] 4) The length of the power arm of the loading arm is greater than or equal to the length of the resistance arm, so as to obtain a large test force with a small hydraulic thrust, which is energy-saving and highly stable. At the same time, the invention can quickly adjust the height of the loading device to adapt to the testing needs of steel pipe concrete columns of different specifications. Attached Figure Description

[0025] Figure 1 Axial view of the present invention Figure 1 .

[0026] Figure 2 This is a schematic diagram of the main view of the present invention.

[0027] Figure 3 Axial view of the present invention Figure 2 .

[0028] Figure 4 This is a schematic diagram of the support frame.

[0029] Among them, 1. Support frame, 1a. Vertical support part, 1b. Inclined adjustment part, 1c. Lateral connection part, 1d. First corner part, 1e. Second corner part, 1f. Third corner part, 2. Linear actuator, 3. Support rod, 4. Loading arm, 5. Connecting assembly, 5a. Slider, 5b. Connecting rod, 5c. Fastener, 6. Mounting seat, 7. Test belt, 8. Pressure block, 9. Limiting hole, 10. Moving trolley, 11. Telescopic cylinder, 12. Loading platform, 13. Moving bracket, 14. Lifting screw, 15. Moving wheel set, 16. Drive motor, 17. Counterweight, 18. Fixed bracket, 19. Steel bracket, 20. Steel pipe concrete column. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] Implementation method one;

[0033] Please see Figure 1-4This embodiment provides a synchronous load testing device for a steel-concrete composite column joint, including a testing device and a loading device. The testing device includes a support frame 1, which is a triangular frame. The first corner 1d of the support frame 1 is attached to the steel-concrete composite column 20. A pressure block 8 is provided on the second corner 1e of the support frame 1, which is located directly above the first corner 1d. The pressure block 8 can press against the steel bracket 19 located at the joint between the steel-concrete composite column 20 and the concrete beam. A test band 7 that can be fitted onto the steel-concrete composite column 20 is also provided above the second corner 1e of the support frame 1. The loading device is installed on the inclined side of the support frame 1 opposite to the second corner 1e, and its position on the inclined side of the support frame 1 is adjustable.

[0034] Furthermore, the support frame 1 includes a vertical support part 1a that abuts against the steel pipe concrete column 20 at its lower end, an inclined adjustment part 1b that is connected to the lower end of the vertical support part 1a to form a first corner 1d, and a transverse connection part 1c that is connected to the upper end of the vertical support part 1a to form a second corner 1e. The inclined adjustment part 1b is connected to the transverse connection part 1c to form a third corner 1f. The inclined adjustment part 1b is an inclined side opposite to the second corner 1e, and a plurality of limiting holes 9 are provided on it along the length direction.

[0035] Furthermore, a mounting base 6 for fixing the test belt 7 is provided above the second corner 1e of the support frame 1 to ensure that the test belt 7 remains fixedly connected to the support frame 1 during the test, thus ensuring the stability of the test.

[0036] Furthermore, the angle of the second corner 1e is 60°-120°, preferably 90°; the angle of the inclined adjustment part 1b relative to the axis of the steel tube concrete column 20 is 30°-60°.

[0037] Furthermore, a polyurethane buffer pad is provided at the contact surface between the vertical support 1a and the steel-concrete composite column 20 to avoid scratching the surface of the steel-concrete composite column 20.

[0038] Furthermore, the bottom of the pressure block 8 is fitted to the upper surface of the steel bracket 19; the bottom of the pressure block 8 is machined with a groove that matches the steel bracket 19 in a tenon-and-mortise joint to prevent the pressure block 8 from sliding laterally and to ensure the stability of the load.

[0039] Furthermore, one end of the test strip 7 is fixedly installed on one side of the mounting base 6, and the other end is wrapped around the steel pipe concrete column 20 hoop and installed on the other side of the mounting base 6 by high-strength bolts.

[0040] Based on the above scheme, a force triangle is formed between the support frame 1, the steel-concrete composite column 20, and the test strip 7 + pressure block 8. When the support frame 1 is pulled downward by the loading device, the lower end (first corner 1d) of the support frame 1 acts as a fulcrum, and the test load acts on the upper part of the steel-concrete composite column 20 through the test strip 7, and at the same time acts on the steel bracket 19 through the pressure block 8. By adjusting the load application position of the loading device on the inclined side of the support frame 1, synchronous load tests of the steel-concrete composite column 20 and its concrete beam joint under different stress states can be realized. When the load application position of the loading device moves along the inclined side of the support frame 1 towards the steel-concrete composite column 20, the test load acting on the test strip 7 gradually decreases, and the test load acting on the pressure block 8 gradually increases. Conversely, the test load acting on the test strip 7 gradually increases, and the test load acting on the pressure block 8 gradually decreases.

[0041] Once the structure, material, and geometric parameters of the support frame 1 are determined, the test loads exerted by the pressure block 8 and the test strip 7 on the steel-concrete composite column 20 (corresponding to the node between the steel-concrete composite column 20 and the concrete beam) can be calculated through force analysis based on the installation positions of the pressure block 8 and the test strip 7. The ultimate load that the node can withstand can then be determined based on the deformation of the steel support block 19 and the steel-concrete composite column 20. The specific calculation process is not the focus of this invention and will not be elaborated here.

[0042] Furthermore, additional ribs can be added inside the support frame 1 to improve its structural stability. It should be noted that "lateral" here does not represent the horizontal direction or the direction perpendicular to the axis of the steel-concrete composite column. Relatively speaking, the angle between the "diagonal" connection and the horizontal plane is larger, while the angle between the "lateral" connection and the horizontal plane is smaller. Only when the "diagonal" connection has a suitable angle can the load transfer and distribution function of the support frame 1 be fully utilized, making the force calculation simplest when the angle of the second corner 1e is 90°. At this point, the pressure block 8 and the test strip 7 can be subjected to more different loading states, thereby measuring the load-bearing capacity of the steel-concrete composite column 20 under more different loading states.

[0043] Preferably, the force calculation is most convenient when the angle of the second corner 1e is 90°. The support frame 1 is a right triangle, with the vertical support part 1a being one of the right-angled sides of the right triangle and the oblique adjustment part 1b being the hypotenuse of the right triangle.

[0044] The loading device is mounted on the inclined adjustment part 1b opposite to the second corner 1e. The inclined adjustment part 1b has several limiting holes 9 along its length. The test load can be applied by mounting the loading device onto a limiting hole 9 via a connecting assembly. The loading device can be configured in various ways; for example, mass blocks (weights) can be installed in stages below the connecting assembly 5, or other loading devices and methods from the prior art can be used. This embodiment provides a loading device and a loading method.

[0045] The loading device includes a loading arm 4 and a vertically lifting loading platform 12. A support rod 3 is located at one end of the upper surface of the loading platform 12, and a linear actuator 2 is located at the other end. One end of the loading arm 4 is hinged to the output end of the linear actuator 2, and the middle part is hinged to the end of the support rod 3. A connecting component 5 is hinged to the other end. The upper end of the connecting component 5 is detachably fixed to the inclined adjustment part 1b of the support frame 1. The length of the power arm of the loading arm 4 is greater than the length of the resistance arm. The support rod 3 is fixedly installed on the loading platform 12 and remains stationary. The upper hinge point of the support rod 3 serves as the rotation fulcrum of the loading arm 4. The linear actuator 2 applies displacement to one end of the loading arm 4. The other end of the loading arm 4 is connected to the limiting hole 9 through the connecting component 5. The displacement of the connecting component 5 is constrained, thus the loading arm 4 becomes a lever. The loading arm 4 between the output hinge point of the linear actuator 2 and the upper hinge point of the support rod 3 constitutes the power arm of the lever structure, while the loading arm 4 between the upper hinge point of the support rod 3 and the hinge point of the connecting component 5 constitutes the resistance arm of the lever structure. Preferably, the length of the power arm of the loading arm 4 is greater than or equal to twice the length of the resistance arm.

[0046] Furthermore, the linear actuator 2 can be a telescopic hydraulic cylinder, which is a servo hydraulic cylinder controlled by a proportional valve to achieve stepless speed regulation of force application. The loading arm 4 transmits torque through the hinge point, forming a lever effect. A pressure sensor is installed between the support rod 3 and the loading arm 4 to monitor the force state of the loading arm 4 in real time and prevent overload. The linear actuator 2 can also be electrically driven.

[0047] Furthermore, the inclined adjustment part 1b is provided with a plurality of limiting holes 9 evenly distributed along its length. The connecting component 5 includes a connecting rod 5b hinged to the other end of the loading arm 4 and a slider 5a hinged to the upper end of the connecting rod 5b. The slider 5a is provided with a fastener 5c that can be inserted into the limiting holes 9. The fastener 5c can be a limiting bolt or a limiting pin. The inclined adjustment part 1b and the connecting component 5 are limited by the fastener 5c and the limiting holes 9. The cooperation between the limiting holes 9 and the connecting component 5 is a conventional means in the art, and the connecting component 5 can also adopt other structural forms.

[0048] Furthermore, to facilitate the movement of the entire device, the device also includes a mobile trolley, which can be a trolley with lifting function in the prior art, or it can adopt the structural form of this embodiment.

[0049] Furthermore, such as Figure 3 As shown, the mobile trolley 10 is equipped with several vertically supporting telescopic cylinders 11. The upper end of the telescopic cylinders 11 is connected to the loading platform 12, which can realize the vertical lifting and lowering of the loading platform 12.

[0050] Furthermore, the mobile trolley 10 is equipped with a mobile support 13 at its bottom, and a set of mobile wheels 15 are mounted on the mobile support 13. The mobile trolley 10 also has a pair of support components on both sides, allowing the mobile trolley 10 to move up and down relative to the mobile support 13. Specifically, the support components include a fixed bracket 18 mounted on the mobile trolley 10, a drive motor 16 mounted on the fixed bracket 18, and a lifting screw 14 mounted on the output shaft of the drive motor 16 and screwed to the mobile support 13. When the mobile support 13 is pushed downwards, the mobile wheels 15 contact the ground, allowing the mobile trolley 10 to move. When the mobile support 13 is raised upwards, the mobile wheels 15 separate from the ground, and the mobile trolley 10 contacts the ground, ensuring stable testing. A counterweight 17 can also be installed on the mobile trolley 10 to improve its stability during loading tests.

[0051] like Figure 2 As shown, with the connection between the loading arm 4 and the strut 3 as the fulcrum, the loading arm 4 between the fulcrum and the linear actuator 2 is the power arm, and the loading arm 4 between the fulcrum and the connecting assembly 5 is the resistance arm. The length of the power arm is greater than the length of the resistance arm. The loading arm 4 is hinged to the upper end of the strut 3, preferably by rotation.

[0052] Furthermore, the length of the power arm is at least twice the length of the resistance arm. When the length ratio of the power arm L1 to the resistance arm L2 is 2:1 (lever ratio), if the linear actuator 2 applies a 10kN thrust, the connecting assembly 5 will output a 20kN test force. The loading lever arm 4 can be replaced with different lengths according to actual usage requirements to adjust the lever ratio and adapt to different test load requirements.

[0053] Specifically, the loading arm 4 can be made of 7075 aerospace aluminum alloy with anodized surface treatment, which is lightweight and has high strength.

[0054] Specifically, the support frame 1 is made of Q460C high-strength steel with a yield strength greater than or equal to 460MPa, the limit bolts are made of 12.9 grade alloy steel bolts with a tensile strength ≥1220MPa, and the limit holes 9 are evenly distributed along the length of the inclined adjustment part 1b.

[0055] Specifically, the test belt 7 is made of steel wire rope or a woven steel wire rope, which has sufficient strength to prevent breakage during testing. The hinge point between the support rod 3 and the loading arm 4 uses a self-lubricating spherical bearing, model GE20ES, with a coefficient of friction less than or equal to 0.003.

[0056] Implementation method two;

[0057] Please see Figure 1-4 This embodiment provides a synchronous load test method for steel pipe column concrete structure joints, using a synchronous load test device for steel pipe column concrete structure joints, including the following steps:

[0058] Install support frame 1 so that pressure block 8 presses against steel bracket 19 located at the joint between steel tube concrete column 20 and concrete beam, so that test belt 7 is hooped on steel tube concrete column 20 above steel bracket 19.

[0059] Install the loading device at any position on the inclined side of the support frame 1;

[0060] The loading device applies a downward load to the inclined side of the support frame 1, and simultaneously tests the load limit of the steel tube concrete column 20 and the steel bracket 19 at the joint of the steel tube concrete column structure, or simultaneously tests the load-deformation law of the steel tube concrete column 20 and the steel bracket 19.

[0061] The above method will be further explained using one embodiment as an example.

[0062] When the device is used, the moving trolley 10 is first pushed to one side of the steel pipe concrete column 20 to be tested. According to the height of the steel pipe concrete column 20 to be tested, the height of the vertical support telescopic cylinder 11 is adjusted so that when the loading arm 4 is set horizontally, the upper end of the support frame 1 is not lower than the upper end of the steel bracket 19.

[0063] When the support frame 1 is installed, the lower end of the vertical support part 1a is attached to the steel pipe concrete column 20, wherein the first corner part 1d abuts against the steel pipe concrete column 20, and the pressure block 8 set on the second corner part 1e presses against the steel bracket 19 located at the joint between the steel pipe concrete column 20 and the concrete beam structure. The test belt 7 is hooped on the steel pipe concrete column 20 and located at the joint between the steel pipe concrete column 20 and the concrete beam structure, with the test belt 7 located directly above the steel bracket 19. The test belt 7 is hung on the upper part of the steel pipe concrete column 20, and the pressure block 8 is placed on the steel bracket 19. The lower end of the support frame 1 is pressed against the surface of the steel pipe concrete column 20.

[0064] According to the test requirements, the connecting component 5 is moved to a suitable position along the inclined adjustment part 1b, and the slider 5a is locked by the fastener 5c (such as the limit bolt) so that the loading device is connected to the support frame 1. The drive motor 16 is controlled to run so that the moving trolley 10 is close to the ground. At the same time, the height of the telescopic cylinder 11 and the linear driver 2 is adjusted so that the loading arm 4 is set horizontally and stably at the target height position.

[0065] During the test, the linear actuator 2 extends and applies force to the support frame 1 through the loading arm 4. The support frame 1 applies tension to the steel-concrete composite column 20 and compressive force to the steel bracket 19. The test measures the force (load limit) required when the steel-concrete composite column 20 and the steel bracket 19 are deformed or damaged. The test load on the steel-concrete composite column 20 and the steel bracket 19 can be calculated based on the force analysis.

[0066] The above-described specific embodiments are merely specific examples of the present invention. The patent protection scope of the present invention includes, but is not limited to, the product form and style of the above-described specific embodiments. Any synchronous load test device for steel tube concrete column structure nodes that conforms to the claims of the present invention, and any appropriate changes or modifications made to it by those skilled in the art, shall fall within the patent protection scope of the present invention.

Claims

1. A device for a synchronized load test of a joint of a concrete filled steel tubular column structure, characterized by: The device includes a testing apparatus and a loading apparatus. The testing apparatus includes a support frame, which is a triangular frame. The first corner of the support frame rests against a steel-concrete composite column. A pressure block is provided on the second corner of the support frame, which is directly above the first corner. The pressure block can press against a steel bracket located at the joint between the steel-concrete composite column and the concrete beam. A testing band that can be fitted onto the steel-concrete composite column is also provided above the second corner of the support frame. The loading apparatus is installed on the inclined side of the support frame opposite to the second corner, and its position on the inclined side of the support frame is adjustable. The support frame includes a vertical support part whose lower end abuts against a steel pipe concrete column, an oblique adjustment part connected to the lower end of the vertical support part to form a first corner, and a transverse connection part connected to the upper end of the vertical support part to form a second corner. The oblique adjustment part and the transverse connection part are connected to form a third corner. The oblique adjustment part is an oblique side opposite to the second corner, and it is provided with a plurality of limiting holes along its length. The synchronous load testing device conducts synchronous load tests using the following method: Install the support frame so that the pressure block presses against the steel bracket located at the joint between the steel tube concrete column and the concrete beam, and so that the test belt is hooped on the steel tube concrete column above the steel bracket. Install the loading device at any position on the inclined side of the support frame; The loading device applies a downward load to the inclined side of the support frame, and simultaneously tests the load limit of the steel-concrete composite column and the steel bracket at the joint of the steel-concrete composite column structure, or simultaneously tests the load-deformation law of the steel-concrete composite column and the steel bracket.

2. The synchronous load test apparatus for a joint of a concrete filled steel tubular column structure according to claim 1, characterized in that: The angle of the second corner is 60°-120°; the angle of the inclined adjustment part relative to the axis of the steel-concrete composite column is 30°-60°.

3. The synchronous load test apparatus for a joint of a concrete filled steel tubular column structure according to claim 2, characterized in that: The loading device includes a loading arm and a vertically lifting loading platform. One end of the upper surface of the loading platform is provided with a support rod, and the other end is provided with a linear actuator. One end of the loading arm is hinged to the output end of the linear actuator, the middle part is hinged to the end of the support rod, and the other end is hinged to a connecting component. The upper end of the connecting component is detachably fixedly installed on the inclined adjustment part of the support frame. The length of the power arm of the loading arm is greater than or equal to the length of the resistance arm.

4. The synchronous load test apparatus for a joint of a concrete filled steel tubular column structure according to claim 3, characterized in that: The connecting assembly includes a connecting rod hinged to the other end of the loading arm and a slider hinged to the upper end of the connecting rod. The slider is provided with a fastener that can be inserted into a limiting hole.

5. The steel tube concrete column structure joint synchronous load test device according to claim 3, characterized in that; A mounting base for fixing the test belt is also provided above the second corner of the support frame.

6. The synchronous load test apparatus for a joint of a concrete filled steel tubular column structure according to claim 3, characterized in that: It also includes a mobile trolley, which has several telescopic hydraulic cylinders on its top that are connected to the bottom of the loading platform.

7. The synchronous load test apparatus for a joint of a concrete filled steel tubular column structure according to claim 6, characterized in that: The bottom of the mobile trolley is also equipped with a mobile support frame, on which a set of mobile wheels is mounted. A pair of support components are also provided on both sides of the mobile trolley, allowing the mobile trolley to move up and down relative to the mobile support frame.

8. The synchronous load test apparatus for a joint of a concrete filled steel tubular column structure according to claim 7, characterized in that: The support assembly includes a fixed bracket mounted on the mobile trolley, a drive motor mounted on the fixed bracket, and a lifting screw mounted on the output shaft of the drive motor and screwed to the mobile bracket.

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