A high temperature loading experiment testing device for a steel pipe concrete structure

Abstract

The application belongs to the technical field of steel pipe concrete testing, in particular to a high-temperature loading experiment testing device for steel pipe concrete structure, which comprises a portal frame, a jack, a support seat, a flame sprayer and a detection assembly; the support seat is composed of a fixed plate and a movable plate; the fixed plate and the movable plate are connected through a universal ball hinge; the detection assembly comprises a displacement sensor one and a displacement sensor two; the two support seats are designed in the form of a combination of a fixed plate and a movable plate, and are flexibly connected through a universal ball hinge, so as to effectively adapt to the possible angle change of the test piece under high-temperature stress state, avoid the constraint interference of the traditional rigid support on the deformation of the test piece, accurately capture the axial compression deformation of the test piece through the displacement sensor one, and monitor the small rotation angle of the test piece caused by stress and high temperature in real time through the displacement sensor two, so as to realize the omnibearing detection of the deformation of the test piece.

Description

Technical Field

[0001] This invention belongs to the field of steel-concrete composite testing technology, specifically a high-temperature loading test device for steel-concrete composite structures. Background Technology

[0002] Concrete-tube steel structures (CVS) are widely used in high-rise buildings, large-span spaces, and important engineering structures due to their excellent load-bearing capacity and construction efficiency. However, frequent explosions at oil platforms, chemical plants, and residential gas stations often trigger secondary fires, forming a chain of "explosion-fire" disasters that seriously threaten structural safety. Therefore, it is necessary to conduct in-depth research on the mechanical properties, damage evolution, and failure mechanisms of CVS under the coupled effects of high temperature and explosive impact to reveal the characteristics of its load-bearing capacity changes under complex disaster environments. By simulating the temperature field distribution and impact load in actual disaster scenarios, this study analyzes the stress-strain response, interfacial bonding performance degradation, and overall stability failure modes of key structural components. This provides theoretical basis and experimental support for developing targeted structural disaster-resistant design methods and protective reinforcement measures, thereby improving the safety and durability of CVS under extreme disaster conditions.

[0003] However, existing high-temperature loading test devices for steel-concrete composite structures typically have the following drawbacks: the loading device and the specimen are mostly rigidly connected, which cannot adapt to the angle changes of the specimen under high-temperature stress, thus creating unnecessary constraints on the specimen deformation and interfering with the true transmission of mechanical response. Furthermore, the detection methods are relatively simple, often only measuring axial compressive displacement and lacking real-time and accurate monitoring of the specimen's torsional angle. This results in the inability to fully obtain the deformation characteristics of the specimen under the combined action of high temperature and load, limiting the reliability and comprehensiveness of high-temperature mechanical property research on steel-concrete composite structures.

[0004] Therefore, the present invention provides a high-temperature loading test device for steel tube concrete structures. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a high-temperature loading test device for steel-concrete composite structures, comprising a gantry frame, a jack, a support base, a flamethrower, and a testing component;

[0007] The jack is fixedly connected to the lower side of the gantry frame; two support bases are provided and used to install steel pipe concrete specimens; the top support base is fixedly connected to the output end of the jack; the bottom support base is fixedly connected to the ground.

[0008] Each support base consists of a fixed plate and a movable plate; the fixed plate and the movable plate are connected by a universal ball joint.

[0009] The detection component is used to measure the axial compressive displacement and rotation angle of the specimen during the loading process; the detection component includes displacement sensor one and displacement sensor two;

[0010] Two displacement sensors are provided, with their two ends fixedly connected between the jack and the fixed plate; four displacement sensors are provided, with their two ends respectively connected to the jack and the movable plate via universal ball joints.

[0011] Preferably, the flamethrowers are arranged in a group and arrayed around the specimen.

[0012] Preferably, an experimental furnace is provided below the gantry frame; a through slot is provided on the top of the experimental furnace.

[0013] Preferably, an elastic fire-resistant pad is fixedly connected between the through groove and the movable plate; the fire-resistant pad is designed as an annular shape with a wavy cross-section.

[0014] Preferably, the top of the groove formed on the upper side of the flame arrestor is fixedly connected to an elastic sealing gasket; a set of annular receiving cavities are formed between the sealing gasket and the flame arrestor; the receiving cavities are filled with coolant.

[0015] Preferably, a box is fixedly connected to the upper side of the experimental furnace; the box is connected to an inlet pipe and an outlet pipe, and the outlet pipe is equipped with a circulation pump; the inlet pipe and the outlet pipe are both connected to each receiving cavity through a set of elastic corrugated pipes.

[0016] Preferably, an elastic diaphragm is fixedly connected inside the receiving cavity at the position between the water inlet pipe and the water outlet pipe.

[0017] Preferably, a flexible hose is fixedly connected to the upper side of the sealing gasket; a set of elastic telescopic tubes are evenly distributed on the lower side of the sealing gasket, and the telescopic tubes are connected to the flexible hoses; a baffle is fixedly connected to the lower end of the telescopic tube.

[0018] Preferably, a gas storage cylinder is fixedly connected to the upper side of the experimental furnace; a piston is slidably sealed inside the gas storage cylinder; a spring is provided between the piston and the gas storage cylinder; a push plate is provided above the gas storage cylinder; the push plate is fixedly connected to the piston by a connecting rod; and the gas storage cylinder is connected to each of the first hoses through a second hose.

[0019] Preferably, the water outlet pipe is connected to a vortex housing; a turbine is rotatably connected inside the vortex housing; the turbine's shaft extends to the outside of the vortex housing and is fixedly connected to a cam, and the cam and the push plate are in contact with each other.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. The high-temperature loading test device for steel-concrete composite structures described in this invention, by designing two support seats as a combination of a fixed plate and a movable plate, and using a universal ball joint to achieve a flexible connection between the two, can effectively adapt to the angle changes that the specimen may undergo under high-temperature stress and maintain stable mechanical transmission, avoiding the constraint interference of traditional rigid supports on specimen deformation; the coordinated setting of displacement sensor one and displacement sensor two can not only accurately capture the axial compression deformation of the specimen through the former, but also monitor the minute rotation angle of the specimen caused by stress and high temperature in real time through the universal ball joint connection between the latter and the movable plate, realizing all-round detection of specimen deformation, and comprehensively obtaining the mechanical response characteristics of the specimen, providing reliable experimental data support for in-depth research on the high-temperature mechanical properties of steel-concrete composite structures.

[0022] 2. The high-temperature loading test device for steel-concrete composite structures described in this invention uses a flame-arresting pad to seal the gap between the movable plate and the through slot, effectively preventing the leakage of high-temperature gas and heat from the experimental furnace, ensuring the stability of the temperature field inside the furnace, and preventing flames from shooting upwards through the through slot and scorching the jacks, displacement sensors, and other potentially used equipment, thus improving the protection of the equipment. In addition, the annular wave-shaped structure of the flame-arresting pad can achieve adaptive deformation through the elastic contraction and extension of the wave-shaped cross-section when the movable plate moves downwards or twists as the specimen is compressed. This not only avoids generating significant additional resistance to the displacement of the movable plate but also continuously seals the through slot, further improving the thermal insulation performance and safety of the experimental device.

[0023] 3. The high-temperature loading test device for steel-concrete composite structures described in this invention, when the circulating pump is started, the coolant in the tank is injected into each receiving cavity through the outlet pipe and the corrugated pipe, and flows in a ring inside the receiving cavity. Then, it flows back into the tank along the corrugated pipe and the inlet pipe, so that the coolant can circulate between the tank and the receiving cavity, continuously delivering the coolant that has absorbed heat in the receiving cavity to the tank, while replenishing the receiving cavity with the coolant that has a lower temperature in the tank, realizing the dynamic renewal of the coolant and avoiding the reduction of heat absorption efficiency due to the coolant being in a high-temperature environment for a long time. Attached Figure Description

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the experimental furnace in this invention;

[0026] Figure 2 This is a schematic diagram of the flamethrower in this invention;

[0027] Figure 3This is a schematic diagram of the jack structure in this invention;

[0028] Figure 4 This is a schematic diagram of the structure of the fire-retardant pad in this invention;

[0029] Figure 5 This is a disassembly diagram of the flame arrestor and sealing gasket in this invention;

[0030] Figure 6 This is a schematic diagram of the gas storage cylinder in this invention;

[0031] Figure 7 This is a cross-sectional view of the experimental furnace in this invention;

[0032] Figure 8 yes Figure 7 Enlarged view of a portion of point A in the middle;

[0033] Figure 9 yes Figure 8 Enlarged view of section B in the middle.

[0034] In the diagram: 1. Gantry frame; 2. Jack; 3. Flamethrower; 4. Specimen; 5. Fixed plate; 6. Movable plate; 7. Displacement sensor 1; 8. Displacement sensor 2; 9. Experimental furnace; 10. Through slot; 11. Flame arrestor pad; 12. Sealing gasket; 13. Receiving cavity; 14. Box body; 15. Water inlet pipe; 16. Water outlet pipe; 17. Circulating pump; 18. Corrugated pipe; 19. Diaphragm; 20. Hose 1; 21. Telescopic pipe; 22. Baffle plate; 23. Gas storage tank; 24. Piston; 25. Spring; 26. Push plate; 27. Hose 2; 28. Vortex casing; 29. ​​Turbine; 30. Cam. Detailed Implementation

[0035] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0036] like Figures 1 to 9 As shown, the high-temperature loading test device for steel-concrete composite structures of the present invention includes a gantry frame 1, a jack 2, a support base, a flamethrower 3, and a testing component.

[0037] The jack 2 is fixedly connected to the lower side of the gantry frame 1; two support seats are provided and used to install the steel pipe concrete specimen 4; the top support seat is fixedly connected to the output end of the jack 2; the bottom support seat is fixedly connected to the ground.

[0038] Each support base consists of a fixed plate 5 and a movable plate 6; the fixed plate 5 and the movable plate 6 are connected by a universal ball joint.

[0039] The flamethrower 3 is provided in a set and arrayed around the specimen 4;

[0040] The detection component is used to measure the axial compressive displacement and torsional angle of the specimen 4 during the loading process; the detection component includes displacement sensor 7 and displacement sensor 8.

[0041] Two displacement sensors 7 are provided, with their two ends fixedly connected between the jack 2 and the fixed plate 5; four displacement sensors 8 are provided, with their two ends respectively connected to the jack 2 and the movable plate 6 via universal ball joints.

[0042] In use, this invention first vertically installs the concrete-tube steel specimen 4 onto the surface of the movable plate 6 of a pair of support seats, ensuring that the specimen 4 is installed firmly and accurately aligned to avoid adverse effects on the test results due to initial eccentricity. Subsequently, an axial pressure load is applied to the specimen 4 using a hydraulic jack 2, precisely controlling the loading rate and load level to simulate the axial force borne by the concrete-tube steel column in an actual engineering structure. During this process, an adjustable flamethrower system 3 is used to uniformly heat the specimen 4, creating a stable and controllable high-temperature fire environment, thereby realistically reproducing the fire state of the concrete-tube steel component under fire conditions. Through this series of operations, the mechanical properties, deformation characteristics, and failure modes of concrete-tube steel under the combined action of high temperature and axial load can be comprehensively simulated and studied.

[0043] This invention designs the two support bases as a combination of a fixed plate 5 and a movable plate 6, and uses a universal ball joint to achieve a flexible connection between the two. This effectively adapts to the angle changes that the specimen 4 may undergo under high temperature and stress, and maintains stable mechanical transmission, avoiding the constraint interference of traditional rigid supports on the deformation of the specimen 4. The coordinated setting of displacement sensor 1 7 and displacement sensor 2 8 not only allows the former to accurately capture the axial compression deformation of the specimen 4, but also allows the latter to monitor the minute rotation angles of the specimen 4 caused by stress and high temperature in real time through the universal ball joint connection with the movable plate 6. This enables comprehensive detection of the deformation of the specimen 4 and can fully obtain the mechanical response characteristics of the specimen 4, providing reliable experimental data support for in-depth research on the high temperature mechanical properties of steel tube concrete structures.

[0044] After the two displacement sensors 7 obtain their respective data, the axial compression deformation of the specimen can be obtained by taking the average of the two values.

[0045] After the four displacement sensors 28 obtain their respective data, the torsional angle of the specimen can be calculated using the following method:

[0046] Four displacement sensors are symmetrically arranged at four points around the ball joint, forming a rectangle (or square).

[0047] Establish a coordinate system with the center of rotation O of the ball joint as the origin, the horizontal plane as the xy plane, and the z-axis pointing vertically upward;

[0048] Let the horizontal coordinates of the four displacement sensors be: , , , , where 2a and 2b are the dimensions of the rectangle in the x and y directions, respectively (if a square is arranged, then a=b);

[0049] Define the rotation angle α around the x-axis: when looking from the positive x-axis direction toward the origin, counterclockwise is positive. When α is positive, the positive y-axis side rises and the negative y-axis side falls.

[0050] Define the rotation angle β around the y-axis as follows: when looking from the positive y-axis direction toward the origin, counterclockwise is positive. When β is positive, the side with the positive x-direction decreases and the side with the negative x-direction increases.

[0051] For any point (x, y), the relationship between the vertical displacement δ (positive upward) and the rotation angle under small deformation is as follows:

[0052]

[0053] The theoretical readings of the four displacement sensors are:

[0054]

[0055]

[0056]

[0057]

[0058] Calculate the rotation angle using the difference in readings:

[0059]

[0060]

[0061] The resultant angle is:

[0062] In one embodiment of the present invention, an experimental furnace 9 is provided below the gantry frame 1; the support base, the flamethrower 3 and the test piece 4 are all located inside the experimental furnace 9, while the jack 2 and the detection components are located outside the experimental furnace 9; a through groove 10 is provided on the top of the experimental furnace 9, and the support base on the top is located inside the through groove 10.

[0063] The experimental furnace 9 adopts a double-layer insulation structure. The inner layer is made of high-temperature refractory material, and the outer layer is made of heat insulation material. This can effectively block heat from being transferred to the outside, providing a stable high-temperature environment for the experiment and avoiding thermal impact on the external environment. In particular, it prevents the impact on jack 2, detection components, and on-site personnel. The setup of the experimental furnace 9 can ensure the accuracy of experimental data acquisition and the safety of equipment operation.

[0064] In one embodiment of the present invention, an elastic fire-resistant pad 11 is fixedly connected between the through groove 10 and the movable plate 6; the fire-resistant pad 11 is designed as an annular shape with a wavy cross-section.

[0065] The size of the flame arrestor pad 11 is adapted to the gap between the movable plate 6 and the through groove 10, which can seal the gap and effectively prevent the high-temperature gas and heat in the experimental furnace 9 from leaking out of the gap, ensuring the stability of the temperature field inside the furnace, preventing flames from shooting up through the through groove 10 and scorching the jack 2, displacement sensor and other equipment that may be used, thus improving the protection effect of the equipment. In addition, the annular wave-shaped structure of the flame arrestor pad 11 can achieve adaptive deformation through the elastic contraction and extension of the wave-shaped cross section when the movable plate 6 moves downward or twists with the compression of the specimen 4. It will not generate a large additional resistance to the displacement of the movable plate 6, and can continuously seal the through groove 10, further improving the heat preservation performance and safety of the experimental device.

[0066] In one embodiment of the present invention, the top of the groove formed on the upper side of the flame arrestor pad 11 is fixedly connected with an elastic sealing gasket 12; a set of annular receiving cavities 13 are formed between the sealing gasket 12 and the flame arrestor pad 11; the receiving cavity 13 is filled with coolant.

[0067] When the temperature inside the experimental furnace 9 rises, the coolant absorbs the heat that may seep out from the flame arrestor pad 11 and disperses the heat through its own thermal conduction, further enhancing the heat insulation effect of the flame arrestor pad 11. The sealing gasket 12 is tightly attached to the top of the groove and works in synergy with the flame arrestor pad 11. It not only prevents the coolant in the receiving cavity 13 from leaking, but also provides a secondary seal for the gaps between the flame arrestor pad 11 and the movable plate 6 and the through groove 10, forming double protection. This structure allows the flame arrestor pad 11 to have both elastic deformation capability and active cooling function. Even during long-term high-temperature experiments, it can effectively maintain sealing and heat insulation performance, avoiding aging or sealing failure of the flame arrestor pad 11 due to local overheating.

[0068] The experimental furnace 9 is fixedly connected to a box 14, and coolant is added inside the box 14. The box 14 is connected to an inlet pipe 15 and an outlet pipe 16, and a circulation pump 17 is equipped on the outlet pipe 16. The inlet pipe 15 and the outlet pipe 16 are connected to each of the receiving cavities 13 through a set of elastic corrugated pipes 18.

[0069] When the circulation pump 17 starts, the coolant in the housing 14 is injected into each of the receiving cavities 13 through the outlet pipe 16 and the bellows pipe 18, and flows in a ring inside the receiving cavity 13. Then, it flows back to the housing 14 through the bellows pipe 18 and the inlet pipe 15, so that the coolant can circulate between the housing 14 and the receiving cavity 13. The coolant that has absorbed heat in the receiving cavity 13 is continuously delivered to the housing 14, while the coolant with a lower temperature in the housing 14 is replenished to the receiving cavity 13. This achieves dynamic renewal of the coolant and avoids a decrease in heat absorption efficiency due to the coolant being in a high-temperature environment for a long time.

[0070] An elastic diaphragm 19 is fixedly connected inside the cavity 13 between the inlet pipe 15 and the outlet pipe 16.

[0071] By setting a diaphragm 19 to separate the receiving cavity 13, when the coolant enters the receiving cavity 13 along the outlet pipe 16 and the bellows 18, it will flow away from the diaphragm 19 inside the receiving cavity 13 due to the obstruction of the diaphragm 19, until it flows through the entire annular receiving cavity 13, and then flows out along the bellows 18 and the inlet pipe 15. This flow path design can significantly prolong the residence time of the coolant in the receiving cavity 13. In particular, after the specimen 4 is displaced, the flame arrestor pad 11 is stretched and deformed or tilted to the side of the inlet pipe 15, causing the flame arrestor pad 11 to be in a non-horizontal state. As a result, after the coolant enters the receiving cavity 13 through the bellows 18 of the outlet pipe 16, it is easy to flow directly to the bellows 18 of the inlet pipe 15 and be discharged under the action of gravity. This design can avoid the above phenomenon, so that the coolant can flow through the entire annular area of ​​the receiving cavity 13 completely, and the contact between the coolant and the inner wall of the receiving cavity 13 is more sufficient, thereby absorbing the heat transferred by the flame arrestor pad 11 more efficiently.

[0072] In one embodiment of the present invention, a flexible hose 20 is fixedly connected to the upper side of the sealing gasket 12; a set of elastic telescopic tubes 21 are evenly distributed on the lower side of the sealing gasket 12, and the telescopic tubes 21 are connected to the flexible hoses 20; a baffle plate 22 is fixedly connected to the lower end of the telescopic tubes 21.

[0073] A gas storage cylinder 23 is fixedly connected to the upper side of the experimental furnace 9; a piston 24 is slidably sealed inside the gas storage cylinder 23; a spring 25 is provided between the piston 24 and the gas storage cylinder 23; a push plate 26 is provided above the gas storage cylinder 23; the push plate 26 and the piston 24 are fixedly connected by a connecting rod; the gas storage cylinder 23 is connected to each hose 20 through a second hose 27.

[0074] The water outlet pipe 16 is connected to a vortex shell 28; a turbine 29 is rotatably connected inside the vortex shell 28; the shaft of the turbine 29 extends to the outside of the vortex shell 28 and is fixedly connected to a cam 30, and the cam 30 and the push plate 26 are in contact with each other.

[0075] When the coolant flows in the outlet pipe 16, it drives the turbine 29 inside the volute 28 to rotate. The shaft of the turbine 29 drives the cam 30 to rotate synchronously. Since the cam 30 and the push plate 26 are in contact, the cam 30 will periodically push the push plate 26 downward during rotation. At this time, the push plate 26 drives the piston 24 to slide downward in the air reservoir 23 through the connecting rod and compress the spring 25. After the gas inside the air reservoir 23 is compressed, it is delivered to each hose 20 through the second hose 27 and flows into each telescopic pipe 21 along the first hose 20, causing the telescopic pipe 21 to extend downward under the action of air pressure, thereby pushing the baffle 22 to move within the receiving cavity 13. When the cam 30 rotates to the non-protruding part and contacts the push plate 26, The elastic potential energy of spring 25 is released, pushing piston 24 to return to its original position. A negative pressure is formed inside gas storage cylinder 23, drawing back the gas in hose 20 and telescopic tube 21. Telescopic tube 21 then contracts and drives baffle 22 to move upward. Through this cyclic action, baffle 22 moves up and down continuously in the receiving cavity 13, disturbing the flowing coolant and breaking the laminar flow state of the coolant in the receiving cavity 13. This causes the coolant to form irregular turbulence, further increasing the frequency of contact and collision between the coolant and the inner wall of the receiving cavity 13 and the flame arrestor pad 11, improving the efficiency of heat exchange, and ensuring that the heat generated by the flame arrestor pad 11 during the experiment can be quickly and fully carried away by the coolant, maintaining the stable heat insulation performance of the flame arrestor pad 11.

[0076] In this invention, in order to accommodate the deformation of the test specimen 4 during the test and the movement of the top movable plate 6, the fire-arresting pad 11, sealing pad 12, corrugated pipe 18, diaphragm 19, hose 1 20 and hose 27 all need to be elastic. The material of the fire-arresting pad 11 can be silicone rubber foam, ceramicizable silicone rubber composite material, etc., and the other elastic structures can be made of general rubber-based materials.

[0077] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0078] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 limiting the scope of protection of this invention.

[0079] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-temperature loading test device for steel-concrete composite structures, characterized in that: Includes gantry (1), jacks (2), support base, flamethrower (3) and detection components; The jack (2) is fixedly connected to the lower side of the gantry frame (1); two support seats are provided and used to install steel pipe concrete specimens (4); the top support seat is fixedly connected to the output end of the jack (2); the bottom support seat is fixedly connected to the ground. Each support base consists of a fixed plate (5) and a movable plate (6); the fixed plate (5) and the movable plate (6) are connected by a universal ball joint; The detection component is used to measure the axial compression displacement and torsional angle of the specimen (4) during the loading process; the detection component includes displacement sensor one (7) and displacement sensor two (8). Two displacement sensors (7) are provided, with their two ends fixedly connected between the jack (2) and the fixed plate (5); four displacement sensors (8) are provided, with their two ends respectively connected to the jack (2) and the movable plate (6) through universal ball joints.

2. The high-temperature loading test device for steel-concrete composite structures according to claim 1, characterized in that: The flamethrowers (3) are arranged in a group and arrayed around the specimen (4).

3. The high-temperature loading test device for steel-concrete composite structures according to claim 1, characterized in that: An experimental furnace (9) is provided below the gantry frame (1); a through slot (10) is provided on the top of the experimental furnace (9).

4. The high-temperature loading test device for steel-concrete composite structures according to claim 3, characterized in that: An elastic fire-resistant pad (11) is fixedly connected between the through groove (10) and the movable plate (6); the fire-resistant pad (11) is designed as an annular shape with a wavy cross section.

5. The high-temperature loading test device for steel-concrete composite structures according to claim 4, characterized in that: The top of the groove formed on the upper side of the flame arrestor (11) is fixedly connected to an elastic sealing gasket (12); a set of annular receiving cavities (13) are formed between the sealing gasket (12) and the flame arrestor (11); the receiving cavity (13) is filled with coolant.

6. The high-temperature loading test device for steel-concrete composite structures according to claim 5, characterized in that: The experimental furnace (9) is fixedly connected to a box (14) on its upper side; the box (14) is connected to an inlet pipe (15) and an outlet pipe (16), and the outlet pipe (16) is equipped with a circulation pump (17); the inlet pipe (15) and the outlet pipe (16) are connected to each of the accommodating cavities (13) through a set of elastic corrugated pipes (18).

7. The high-temperature loading test device for steel-concrete composite structures according to claim 6, characterized in that: The cavity (13) is fitted with an elastic diaphragm (19) at the position between the inlet pipe (15) and the outlet pipe (16).

8. The high-temperature loading test device for steel-concrete composite structures according to claim 6, characterized in that: The upper side of the sealing gasket (12) is fixedly connected to a hose (20); a set of elastic telescopic tubes (21) are evenly distributed on the lower side of the sealing gasket (12), and the telescopic tubes (21) are connected to the hose (20); the lower end of the telescopic tubes (21) is fixedly connected to a baffle plate (22).

9. The high-temperature loading test device for steel-concrete composite structures according to claim 8, characterized in that: A gas storage cylinder (23) is fixedly connected to the upper side of the experimental furnace (9); a piston (24) is slidably sealed inside the gas storage cylinder (23); a spring (25) is provided between the piston (24) and the gas storage cylinder (23); a push plate (26) is provided above the gas storage cylinder (23); the push plate (26) is fixedly connected to the piston (24) by a connecting rod; the gas storage cylinder (23) is connected to each hose one (20) through hose two (27).

10. The high-temperature loading test device for steel-concrete composite structures according to claim 9, characterized in that: The water outlet pipe (16) is connected to a vortex shell (28); a turbine (29) is rotatably connected inside the vortex shell (28); the shaft of the turbine (29) extends to the outside of the vortex shell (28) and is fixedly connected to a cam (30), and the cam (30) and the push plate (26) are in contact with each other.

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