Concrete stress deformation test device and method simulating thermal-fluid-solid coupling

Abstract

This invention discloses a test apparatus and method for simulating the thermal-fluid-structure interaction of concrete under stress and deformation. It addresses the lack of comprehensive analysis of concrete material properties considering the three-field coupling of thermal, fluid, and solid fields in existing testing instruments, showcasing the influence of local stress, and the changes in local water pressure, local pressure, and local thermal energy. The experimental device incorporates internal water pressure and internal thermal energy within the concrete material, enabling precise analysis of the reliability of the specimen under various complex and variable environmental conditions. The test results demonstrate that the long-term stress and deformation of concrete materials meet engineering design requirements.

Description

Technical Field

[0001] This invention belongs to the field of mechanical property testing and analysis of concrete materials, specifically relating to a test device for simulating the long-term stress deformation of concrete under thermal-fluid-structure interaction. Background Technology

[0002] The environment faced by foundation concrete is becoming increasingly complex, influenced by water pressure, the increasing availability of geothermal energy, and the effects of heat and gravity, among other multi-field coupling phenomena. Therefore, it is necessary to realistically demonstrate these multi-field coupling phenomena in concrete. Patent CN109916705A discloses a high-temperature, high-pressure oil seal rotational performance testing machine, which also discloses the creep process of the test block under high temperature and pressure. Patent CN109580395A discloses a drop hammer impact rock shear creep testing machine and test method, but this testing machine only shows the specimen under a loading system and drop hammer impact mechanism, observing the creep of the specimen under pressure load conditions. Patent CN208366745U discloses a high-temperature water vapor environment creep endurance testing machine, which includes a water vapor environment simulation unit, a water vapor generation unit, and a creep endurance loading unit.

[0003] The aforementioned experimental instruments do not comprehensively test the material properties of thermal fluid solids. In actual engineering, they will be subjected to more complex three-term coupling effects. At the same time, there is no local stress during loading. There will be some local water pressure and temperature difference pressure on site, but there is no change in local stress. Therefore, the concrete test block does not reflect the internal water pressure and internal heat energy. Summary of the Invention

[0004] To address the technical problems existing in the prior art, this invention provides a test device for long-term stress-deformation of concrete simulating the effects of thermo-fluid-structure interaction. This device overcomes the lack of comprehensive analysis of concrete material properties considering the interaction of the three fields (thermal, fluid, and structural) in existing testing instruments, showcasing the influence of local stress, and the changes in local water pressure, local pressure, and local thermal energy. By incorporating internal water pressure and internal thermal energy within the concrete material, the experimental device accurately analyzes the reliability of the specimen under various complex and variable environmental influences, and tests the long-term stress-deformation of concrete materials to meet engineering design requirements.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] This invention provides a test device for simulating the long-term stress and deformation of concrete under heat-fluid-structure interaction, comprising a base, a support device, a top hydraulic jack, a high-temperature furnace device, a bottom hydraulic jack, and a flowing liquid unit.

[0007] A support device is installed on the base, and a top hydraulic jack is fixed on the support device. The core column inside the top hydraulic jack has a hollow structure. A bottom hydraulic jack is fixed at the center of the top surface of the base, and the core column inside the bottom hydraulic jack has a hollow structure. A high-temperature furnace device is installed between the top hydraulic jack and the bottom hydraulic jack. The high-temperature furnace device is supported by a support column installed on the base. The test block is placed inside the high-temperature furnace device. The top hydraulic jack and the bottom hydraulic jack extend into the high-temperature furnace device to pressurize the test block. Temperature control devices are installed at the contact points between the top hydraulic jack and the bottom hydraulic jack and the test block. The flowing liquid unit is connected to the high-temperature furnace device, the top hydraulic jack, and the bottom hydraulic jack, respectively, and supplies flowing liquid to the high-temperature furnace device, the top hydraulic jack, and the bottom hydraulic jack.

[0008] As a further technical solution, the temperature control device is a thermosetting composite temperature control device, and a large number of resistance wires are provided on the surface of the thermosetting composite temperature control device that contacts the test tube.

[0009] As a further technical solution, the temperature control device is a thermo-solid-fluid composite temperature control device. The thermo-solid-fluid composite temperature control device has a large number of resistance wires on the surface that contacts the test tube, and also has a cavity. The cavity is connected to the corresponding top hydraulic jack or bottom hydraulic jack.

[0010] As a further technical solution, a thermo-solid-fluid composite temperature control device connected to the top hydraulic jack has a sealed connection between its top and the top hydraulic jack, and a cavity is provided at its bottom.

[0011] As a further technical solution, a temperature control device connected to the bottom hydraulic jack has a sealed connection between its bottom and the bottom hydraulic jack, and a cavity is provided at its top.

[0012] As a further technical solution, the thermo-solid-fluid composite temperature control device is sealed to the top hydraulic jack and the bottom hydraulic jack.

[0013] Secondly, this invention also proposes a test method for a test device for simulating the thermal-fluid-structure interaction of concrete under long-term stress and deformation, as follows:

[0014] Solid concrete specimens were used and placed inside a high-temperature furnace. The top and bottom hydraulic jacks were pressed tightly against the upper and lower surfaces of the specimens. The temperature control device first used a thermo-solid-fluid composite temperature control device to fill the top and bottom hydraulic jacks with liquid, creating localized flow pressure at the center of the upper and lower surfaces of the specimens. Liquid was then introduced into the high-temperature furnace to create an external circumferential pressure around the concrete specimens. The high-temperature resistance wire of the thermo-solid-fluid composite temperature control device heated the upper and lower surfaces of the concrete specimens to simulate a high-temperature environment. The changes in the material properties of the concrete specimens under this thermo-fluid-solid three-field coupling environment were observed.

[0015] Thirdly, the present invention also proposes a test method for a test device for simulating the thermal-fluid-structure interaction of concrete under long-term stress and deformation, as follows:

[0016] Solid concrete specimens were used and placed inside a high-temperature furnace. The top and bottom hydraulic jacks were pressed tightly against the upper and lower surfaces of the specimens. The temperature control device first used a thermosetting composite temperature control device, which introduced liquid into the high-temperature furnace to form an external ring pressure around the concrete specimens. The high-temperature resistance wire of the thermosetting composite temperature control device heated the upper and lower surfaces of the concrete specimens to simulate a high-temperature environment. The changes in the material properties of the concrete specimens under this thermo-fluid-solid three-field coupling environment were observed.

[0017] Fourthly, this invention also proposes a test method for a concrete long-term stress-deformation test device that simulates the thermal-fluid-structure interaction, as follows:

[0018] The test block is a cylindrical test block, and a cylindrical through hole is set at the center of the interior of the cylindrical test block;

[0019] A cylindrical specimen was placed inside a high-temperature furnace, with the top and bottom hydraulic jacks pressing tightly against the upper and lower surfaces of the specimen. The temperature control device first employed a thermo-solid-fluid composite temperature control system, filling the top and bottom hydraulic jacks with liquid. Simultaneously, the liquid filled the through-holes of the cylindrical specimen. Liquid was then introduced into the high-temperature furnace to create an external circumferential pressure around the concrete specimen. The high-temperature resistance wire of the thermo-solid-fluid composite temperature control system heated the upper and lower surfaces of the concrete specimen to simulate a high-temperature environment. The changes in the material properties of the concrete specimen under this thermo-fluid-solid three-field coupling environment were observed.

[0020] Fifthly, the present invention also proposes a test method for the concrete long-term stress-deformation test device for simulating thermal-fluid-structure interaction, as follows:

[0021] The test block is a cylindrical test block with a cylindrical through hole at the center of the interior, and a high-temperature resistance rod is placed inside the through hole.

[0022] The test block was placed inside a high-temperature furnace, with the top and bottom hydraulic jacks pressing tightly against the upper and lower surfaces of the cylindrical test block. The temperature control device first used a thermosetting composite temperature control device, which introduced liquid into the high-temperature furnace to form an external ring pressure around the concrete test block. The high-temperature resistance wire of the thermosetting composite temperature control device heated the upper and lower surfaces of the concrete test block to simulate a high-temperature environment. The performance characteristics of the concrete material were observed under the conditions of the pressure center around the test block and the high temperature of the upper and lower surfaces.

[0023] The beneficial effects of the above embodiments of the present invention are as follows:

[0024] This invention provides a test device for simulating the long-term stress and deformation of concrete under thermo-fluid-structure interaction. The device is simple to manufacture and operate, and can observe and record multi-field coupled loading of concrete specimens under long-term stress, realistically reproducing the creep process and deformation characteristics of concrete in actual engineering. The invention includes a support device, a top hydraulic jack reinforcement unit, a high-temperature furnace unit, a bottom hydraulic jack unit, a bottom jack reinforcement device, a concrete specimen unit, and a flowing liquid operation unit. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0026] Figure 1 This is a front view of the testing apparatus in its initial state according to the present invention;

[0027] Figure 2 This is a cross-sectional view of the high-temperature furnace device of the testing apparatus in this invention;

[0028] Figure 3 A schematic diagram of the hydraulic jack in this invention;

[0029] Figure 4 Cross-sectional view of the hydraulic jack in this invention;

[0030] Figure 5 A schematic diagram of the working principle of the heat flux solid temperature control device in this invention;

[0031] Figure 6 A cross-sectional view of the thermo-solid-fluidic composite temperature control device and the test block in this invention;

[0032] Figure 7 A schematic diagram of the thermo-solid-fluid composite temperature control device of the present invention;

[0033] Figure 8 A schematic diagram of the rectangular test block and temperature control device in this invention;

[0034] Figure 9 A schematic diagram of a resistance wire placed inside a cylindrical test block in this invention;

[0035] Figure 10 The thermosetting composite temperature control device of the present invention;

[0036] In the diagram: 1-base, 2-column, 3-top jack reinforcement device, 4-high temperature furnace device, 5-bottom jack reinforcement device, 6-crossbeam, 7-top hydraulic jack, 8-upper thermo-solid-fluid composite temperature control device, 10-bottom hydraulic jack, 11-instrument control box, 12-liquid storage tank, 13-lower thermo-solid-fluid composite temperature control device, 14-top plate, 15-nut, 16-washer, 17-reinforcing screw, 18-bottom plate, 19-outer wall of high temperature furnace;

[0037] 9-Test block, 9-1 Through hole;

[0038] 20-Thermo-solid-fluid composite temperature control device, 20-1 Resistance wire, 20-2 Cylindrical cavity, 20-3 Rigid rubber gasket;

[0039] 24-Test Block;

[0040] 25 thermosetting composite temperature control device, 25-1 resistance wire, 25-2 padding layer;

[0041] 26 test blocks, 26-1-high temperature resistance rod;

[0042] 27 Upper thermosetting composite temperature control device, 28 Lower thermosetting composite temperature control device. Detailed Implementation

[0043] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] For ease of description, the words "up," "down," "left," and "right" appearing in this invention only indicate that they are consistent with the up, down, left, and right directions of the accompanying drawings themselves, and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component 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 this invention.

[0046] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this invention proposes a test device and method for simulating the long-term stress deformation of concrete under thermal-fluid-structure interaction.

[0047] In a typical embodiment of the present invention, such as Figures 1-10 As shown, the test device for simulating the long-term stress and deformation of concrete under the action of thermal-fluid-structure interaction includes a base 1, a support device, a top hydraulic jack reinforcement unit 5, a high-temperature furnace device 4, a bottom hydraulic jack 10, a bottom jack reinforcement device 3, an instrument operation box 11, and a liquid storage tank 12.

[0048] A column 2 is installed at each of the four corners of the base 1. An upper crossbeam 6 and a top plate are installed on the top of the column 2. A top hydraulic jack 7 is fixed on the top plate. The core column inside the top hydraulic jack 7 has a hollow structure.

[0049] A bottom hydraulic jack 10 is fixed at the center of the top surface of the base 1. The core column inside the bottom hydraulic jack 10 has a hollow structure.

[0050] A high-temperature furnace device 4 is provided between the top hydraulic jack 7 and the bottom hydraulic jack 10. The high-temperature furnace device 4 is supported by a support column provided on the base 1. The test block is placed inside the high-temperature furnace device 4. The top hydraulic jack 7 and the bottom hydraulic jack 10 extend into the high-temperature furnace device 4 to pressurize the test block.

[0051] Furthermore, temperature control devices are installed at the contact points between the top hydraulic jack 7 and the bottom hydraulic jack 10 and the test block. In this embodiment, two types of temperature control devices are included. The first type is a thermosetting composite temperature control device, such as... Figure 10 As shown, the first type of thermosetting composite temperature control device has a large number of resistance wires on the surface that contacts the test block; the second type of temperature control device is a thermosetting-fluidic composite temperature control device, which, in addition to having a large number of resistance wires on the surface that contacts the test block, also has a cavity, such as... Figure 7As shown, the temperature control device connected to the top hydraulic jack 7 has a sealed connection at the top and a cavity at the bottom for holding the liquid injected through the core column; the temperature control device connected to the bottom hydraulic jack 10 has a sealed connection at the bottom and a cavity at the top for holding the liquid injected through the core column; the two different temperature control devices in this embodiment are used for different test conditions.

[0052] Furthermore, the test blocks in this embodiment include three types. The first type is a rectangular concrete test block 24 with a solid internal structure, specifically as follows: Figure 8 The test block shown is shown in the image; the second type is a cylindrical test block 9, with a cylindrical through hole 9-1 set at the center of the interior of the cylindrical test block, as shown in the image. Figure 4 , Figure 5 , Figure 6 As shown; the third type is a cylindrical test block 26, in which a cylindrical through hole is provided inside, and a high-temperature resistance rod 26-1 is provided inside the through hole, as shown in the details. Figure 9 As shown.

[0053] Specifically, the support system consists of a 120cm×70cm×50cm base 1 at the bottom. Four cylindrical columns 2 are reinforced at the four corners of the base 1 to support the upper crossbeam 6, the top plate, and the hydraulic jack 7 for reaction force. The four columns are tightened into pre-drilled holes in the base using nuts and washers. The columns are made of structural steel, which exhibits minimal deformation during testing and does not affect the accuracy of the results. To ensure ease of reinforcement and stability of the top hydraulic jack, the crossbeam 6 is first erected on top of the four columns, firmly connecting it to the columns 2. The top plate is reinforced on the crossbeam 6, also made of structural steel, and is tightly secured to the crossbeam system using washers 16 and nuts 15. The joints are welded using electroslag pressure welding, and the reinforcing bolts must have three exposed threads for safety.

[0054] The top hydraulic jack 7 is reinforced on the top plate of the crossbeam. A pre-drilled steel plate with holes is installed at the top of the top plate, and another pre-drilled steel plate with holes at the bottom. The upper and lower steel plates are connected to the holes using threaded rods, and both are tightened with washers and nuts to ensure a secure installation on the top plate. If the holes in the steel plates are improperly pre-drilled, gas cutting to enlarge the holes is prohibited; instead, a reamer or file must be used. The next step is to fix the top hydraulic jack. The base of the top hydraulic jack is reinforced with two steel plates, making its inner diameter smaller than that of the fixed base. A screw rod for stable reinforcement is used, extending through the bottom of the top jack and securely fastened to the crossbeam system. The loading rod of the hydraulic jack uses a hollow core column structure. Adjusting the extension and retraction dimensions allows for adjustment of the load pressure. Flowing liquid can be injected inside the hollow core column structure.

[0055] Furthermore, in this embodiment, the thermo-solid-fluid composite temperature control device and the hydraulic jack have a detachable interface reinforced with nuts. To ensure the airtightness of the liquid between the jack core and the thermo-solid-fluid composite temperature control device, a rigid rubber washer can be used to wrap the interface, and a steel retaining ring is used for tightening on the outside. A circumferential resistance wire is installed inside the thermo-solid-fluid temperature control device for heating. A cylindrical cavity is also formed on the thermo-solid-fluid temperature control device to hold the liquid injected through the core. For the specific structure of the thermo-solid-fluid temperature control device, please refer to [reference needed]. Figure 7 Resistance heating is an electric heating method that uses the heat energy generated by the Joule effect when an electric current flows through a conductor to heat an object. The higher the current used for resistance heating, the higher the temperature will be. However, the temperature limit that the resistance wire can withstand must not be exceeded during heating. If the temperature exceeds the limit of 1500℃, the input current must be stopped immediately.

[0056] The resistance wire and the flowing liquid injected by the jack core column act together on the surface of the test block. The mechanism of the thermal load on the test block is heat convection, which needs to be isolated from the flowing liquid in the core column. A circumferential resistance wire is installed around the perimeter, leaving the flowing liquid section in the middle, so that the test block is simultaneously affected by the high-temperature load on the top surface and by the flowing liquid. The temperature control device is a detachable and replaceable connector, available in heat-fluid-solid three-field coupling and heat-solid coupling modes, meeting the requirements for measuring the creep process and change characteristics of concrete materials in both single and composite environments.

[0057] The hydraulic jack is affected by the high temperature environment during operation, so a high-temperature furnace device 4 needs to be set up. The high-temperature furnace device 4 is mainly composed of the heat insulation wall of the high-temperature furnace outer wall. The high temperature places high requirements on the material properties of the furnace wall. The high temperature, liquid pressure and load pressure must be operated inside the high-temperature furnace. The temperature control device connected to the jack extends into the test block and acts on the test block. When the test block is a cube, flowing liquid is injected into the high-temperature furnace device 4. The test block is subjected to circumferential flow pressure and high temperature and flowing liquid pressure at the top and bottom contact surfaces. Specifically, the high-temperature furnace device 4 in this embodiment includes a top plate 14 and a bottom plate 18. The top plate 14 and the bottom plate 18 are connected by a reinforcing screw 17 and the high-temperature furnace outer wall 19. The top hydraulic jack passes through the top plate 14 and the bottom hydraulic jack passes through the bottom plate 18.

[0058] When the test block is hollow, the liquid at the top and bottom is a continuous flowing liquid, subjected to outward circumferential pressure from the core column. The bottom of the high-temperature furnace device 4 ensures the working space of the bottom hydraulic jack. The high-temperature furnace device 4 is placed on the support frame and fixed to the base 1 at the bottom with nuts and bolts. A hydraulic gun is set on the right side to inject liquid into the working chamber. The liquid is stored in the liquid storage tank 12 and connected to the instrument operation box 11 for use of the testing instrument.

[0059] The implementation method of the device for monitoring the creep of concrete test blocks is as follows;

[0060] The creep process and deformation characteristics of concrete specimens under long-term stress under thermo-fluid-structure interaction; the changes in the performance of concrete materials under various thermo-fluid-structure interaction environments; the stress characteristics of concrete materials observed under the combined forces of thermo-fluid-structure interaction and internal local water pressure in hollow specimens; and the influence of high-temperature environment inside hollow specimens on the creep process and deformation characteristics of concrete.

[0061] The first test method for the first type of test block 24 (rectangular concrete test block) is as follows:

[0062] Concrete specimen 24 is placed inside a high-temperature furnace device, with the top and bottom hydraulic jacks pressing tightly against the upper and lower surfaces of the specimen. The temperature control probes of the top and bottom hydraulic jacks first use a thermo-solid-fluid composite temperature control device (upper thermo-solid-fluid composite temperature control device 8 and lower thermo-solid-fluid composite temperature control device 13) to flow liquid at the center of the upper and lower surfaces of the specimen to simulate the local flow pressure of the specimen. High-temperature resistance wires arranged around the specimen, which are isolated from the liquid, heat the upper and lower surfaces of the specimen to simulate a high-temperature environment. Flow liquid is injected around the specimen to form an external ring pressure (liquid is introduced into the high-temperature furnace device 4 through the liquid storage tank 12). The changes in material properties of the concrete specimen under this thermo-fluid-solid three-field coupling environment are observed.

[0063] The second test method for the first type of test block 24 (rectangular concrete test block) is as follows:

[0064] The concrete specimen 24 was placed inside the high-temperature furnace device 4. The temperature control probes were made of upper thermosetting composite temperature control device 27 and lower thermosetting composite temperature control device 28, which could only pass through thermosetting forces. Only a high-temperature load was applied to the concrete specimen 24. The contact surface of the temperature control device joint was filled with resistance wire. The upper and lower surfaces of the concrete specimen 24 were in complete contact with the high-temperature environment and the surrounding area was filled with flowing liquid (liquid was introduced into the high-temperature furnace device 4 through liquid storage tank 12). The deformation characteristics of the specimen under long-term load were observed and recorded.

[0065] The second test method for specimen 9, namely the test method of passing flowing liquid through the concrete specimen, is as follows:

[0066] Test block 9 is a hollow concrete test block. The test block is placed in the high-temperature furnace device. Under the conditions of thermal-solid-solid three-field coupling arranged by the upper thermal-solid-solid composite temperature control device 8 and the lower thermal-solid-solid composite temperature control device 13, it is brought into close contact with the test block. The hollow hydraulic jacks are sealed tightly, and liquid is simultaneously introduced through the top and bottom hydraulic jacks. The internal flow of liquid simulates the flow pressure. Appropriate temperature control probes are selected based on the size of the test block at the contact surface between the temperature control device and the test block. The temperature control device is detachable to ensure the flexibility of the test block. A flow pressure is reserved in the center of the temperature control device, surrounded by resistance wires. The temperature of the resistance wires is controlled by the magnitude of the current; the higher the current, the higher the temperature. Temperature control probes at both the upper and lower contact surfaces are arranged accordingly. The test block is filled with flowing liquid (liquid is introduced into the high-temperature furnace device 4 through the liquid storage tank 12). The creep process of the concrete test block under the thermal-solid three-field composite environment and the local flow pressure environment within the test block is observed.

[0067] The test method for the third type of test block 26 is as follows:

[0068] A heatable resistance wire 26-1 is added inside the hollow test block 26 to simulate a high-temperature environment. The upper and lower temperature control devices adopt thermosetting composite temperature control devices, such as... Figure 9 , Figure 10 As shown; the upper and lower temperature control devices heat the concrete test block under the action of the top hydraulic jack and the bottom hydraulic jack; the upper and lower contact surfaces are all heated with high-temperature resistance wires, and then flowing liquid is injected around the test block (liquid is introduced into the high-temperature furnace device 4 through the liquid storage tank 12). The test block shows the performance changes of concrete materials under the flowing pressure center around the test block and the high temperature of the upper and lower surfaces.

[0069] In this embodiment, the test block is a hollow concrete model. Under the condition of thermal-fluid-solid three-field coupling with the upper and lower temperature control devices, it is brought into close contact with the test block. The hollow part of the hydraulic jack is sealed tightly, and the inside is filled with flowing liquid to simulate flow pressure. Appropriate temperature control probes are selected according to the size of the test block at the contact surface between the temperature control device and the test block. The temperature control device is detachable to ensure the flexibility of the test block. The center of the temperature control device is reserved for the flow pressure, and resistance wires are arranged around it. The temperature of the resistance wires is controlled by the magnitude of the current; the higher the current, the higher the temperature. The temperature control probes at the upper and lower contact surfaces are arranged accordingly, and the test block is filled with flowing liquid.

[0070] In this embodiment, a high-temperature resistance wire is installed inside the test block, and a heatable resistance wire is added inside the hollow test block to simulate a high-temperature environment. The temperature control device on the contact surface heats the concrete test block under the action of a hydraulic jack. Both the upper and lower contact surfaces are heated with high-temperature resistance wires. Flowing liquid is injected around the test block, and the performance characteristics of the concrete material are observed under the pressure center of the flowing liquid around the test block and the high temperature environment of the upper and lower surfaces.

[0071] Finally, it should be noted that relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A test apparatus for simulating the stress-deformation effect of concrete under heat-fluid-structure interaction, characterized in that, Includes a base, support device, top hydraulic jack, high-temperature furnace device, bottom hydraulic jack and flow liquid unit; A support device is installed on the base, and a top hydraulic jack is fixed on the support device. The core column inside the top hydraulic jack has a hollow structure. A bottom hydraulic jack is fixed at the center of the top surface of the base, and the core column inside the bottom hydraulic jack has a hollow structure. A high-temperature furnace is installed between the top and bottom hydraulic jacks. The high-temperature furnace is supported by a support column installed on the base. The test block is placed inside the high-temperature furnace. The top and bottom hydraulic jacks extend into the high-temperature furnace to pressurize the test block. Temperature control devices are installed at the contact points between the top and bottom hydraulic jacks and the test block. The flowing liquid unit is connected to the high-temperature furnace, the top hydraulic jack, and the bottom hydraulic jack, respectively. Liquid is filled into the top and bottom hydraulic jacks, forming localized flowing pressure at the center of the upper and lower surfaces of the test block. The temperature control device is a thermo-solid-fluid composite temperature control device. The surface of the thermo-solid-fluid composite temperature control device that contacts the test block is provided with a large number of resistance wires and a cavity. The cavity is connected to the corresponding top hydraulic jack or bottom hydraulic jack.

2. The concrete stress-deformation test device for simulating thermo-fluid-structure interaction as described in claim 1, characterized in that, The thermo-solid-fluid composite temperature control device is connected to the top hydraulic jack, with its top sealed to the top hydraulic jack and a cavity at the bottom.

3. The concrete stress-deformation test device for simulating thermo-fluid-structure interaction as described in claim 1, characterized in that, The temperature control device is connected to the bottom hydraulic jack, with its bottom sealed to the bottom hydraulic jack and a cavity at the top.

4. The concrete stress-deformation test device for simulating thermo-fluid-structure interaction as described in claim 1, characterized in that, The thermo-solid-fluid composite temperature control device is sealed to the top hydraulic jack and the bottom hydraulic jack.

5. The test method of the concrete stress-deformation test device simulating thermo-fluid-structure interaction as described in any one of claims 1-4, characterized in that, Solid concrete specimens were used and placed inside a high-temperature furnace. The top and bottom hydraulic jacks were pressed tightly against the upper and lower surfaces of the specimens. The temperature control device first used a thermo-solid-fluid composite temperature control device to fill the top and bottom hydraulic jacks with liquid, creating localized flow pressure at the center of the upper and lower surfaces of the specimens. Liquid was then introduced into the high-temperature furnace to create an external circumferential pressure around the concrete specimens. The high-temperature resistance wire of the thermo-solid-fluid composite temperature control device heated the upper and lower surfaces of the concrete specimens to simulate a high-temperature environment. The changes in the material properties of the concrete specimens under this thermo-fluid-solid three-field coupling environment were observed.

6. The test method of the concrete stress-deformation test device simulating thermo-fluid-structure interaction as described in any one of claims 1-4, characterized in that, The test block is a cylindrical test block, and a cylindrical through hole is set at the center of the interior of the cylindrical test block; A cylindrical specimen was placed inside a high-temperature furnace, with the top and bottom hydraulic jacks pressing tightly against the upper and lower surfaces of the specimen. The temperature control device first employed a thermo-solid-fluid composite temperature control system, filling the top and bottom hydraulic jacks with liquid. Simultaneously, the liquid filled the through-holes of the cylindrical specimen. Liquid was then introduced into the high-temperature furnace to create an external circumferential pressure around the concrete specimen. The high-temperature resistance wire of the thermo-solid-fluid composite temperature control system heated the upper and lower surfaces of the concrete specimen to simulate a high-temperature environment. The changes in the material properties of the concrete specimen under this thermo-fluid-solid three-field coupling environment were observed.

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