Reactor cabin structure internal pressure-bending combined load test device and test method thereof

Abstract

The invention discloses a reactor cabin structure internal pressure-bending combined load test device and a test method thereof.The device comprises a test module, the test module comprises a test section, a first transition section and a second transition section, and the test section is provided with a first pressure cabin and a second pressure cabin; the internal pressure loading module comprises a water tank and a pressure pump; the bending loading module comprises a first vertical loading mechanism and a second vertical loading mechanism; the bottom supporting module comprises a first supporting mechanism and a second supporting mechanism; and the measuring module comprises a first pressure sensor, a second pressure sensor and a pressure gauge. According to the invention, the internal pressure loading module and the bending loading module are used for simulating the load of the pressure chamber structure under dual accident conditions, the structural response under the condition of superposition of different internal pressure loads and different bending loads is known, and the safety and reliability of a chamber section model of the pressure chamber structure under the accident conditions are analyzed.

Description

Technical Field

[0001] The invention belongs to the technical field of hull beam bending tests, and in particular relates to a reactor cabin structure internal pressure-bending combined load test device and a test method thereof. Background Art

[0002] During the actual operation of nuclear-powered ships, accidents may occur, and the ships may even break, capsize or even sink. Therefore, ensuring the safety and stability of the pressure chamber structure under accident conditions is a complex and unavoidable issue in the design stage of such hull structures.

[0003] At present, there are test platforms for hull beam bending in China, and there are also test methods for pressurizing pressure chamber models, but there is still a lack of effective means for internal pressure-bending combined loading, and one model can only complete one test. The utilization rate of the test model is low and the test cycle is long. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a reactor compartment structure internal pressure-bending combined load test device and a test method thereof.

[0005] In order to achieve the above-mentioned purpose, the present invention is a reactor compartment structure internal pressure-bending combined load test device, comprising:

[0006] A test module, the test module comprising a test section, a first transition section and a second transition section, the test section having a first pressure chamber and a second pressure chamber; the first transition section and the second transition section are respectively fixedly arranged at two ends of the test section, for extending the length of the force arm for forming a bending load;

[0007] An internal pressure loading module, the internal pressure loading module comprises a water tank and a pressure pump, the outlet of the water tank is connected to the inlet of the first pressure chamber through the pressure pump, the outlet of the first pressure chamber is connected to the inlet of the water tank, and the outlet of the first pressure chamber is located above the inlet of the first pressure chamber; a closed loop is formed by the water tank and the pressure pump, the internal pressure is stable and can be repeatedly loaded, the outlet of the first pressure chamber is higher than the inlet, and the gravity exhaust design is used to avoid gas residue, thereby improving the internal pressure loading accuracy;

[0008] A bending loading module, the bending loading module comprising a first vertical loading mechanism and a second vertical loading mechanism, the first vertical loading mechanism and the second vertical loading mechanism being arranged above the test section for applying a bending load to the test section;

[0009] A bottom support module, the bottom support module comprising a first support mechanism and a second support mechanism, the first support mechanism and the second support mechanism are respectively arranged at the bottom of both ends of the test module in the length direction for supporting the test module;

[0010] A measuring module, wherein the measuring module comprises a first pressure sensor, a second pressure sensor and a pressure gauge, wherein the first pressure sensor and the second pressure sensor are respectively used to monitor the bending load applied to the test section by the first vertical loading mechanism and the second vertical loading mechanism; the pressure gauge is used to monitor the pressure value at the outlet of the first pressure chamber.

[0011] Furthermore, the outlet of the water tank is connected to the inlet of the pressure pump through a first pipe, and the outlet of the pressure pump is connected to the inlet of the first pressure chamber through a second pipe; the outlet of the first pressure chamber is connected to the inlet of the water tank through a third pipe; and the pressure gauge is arranged on the third pipe.

[0012] Furthermore, a first valve is provided on the second pipeline, and a second valve is provided on the third pipeline.

[0013] Further, the first vertical loading mechanism includes a first distribution beam and a first vertical loader, and the first vertical loader is arranged in the upper middle part of the first distribution beam;

[0014] The second vertical loading mechanism includes a second distribution beam and a second vertical loader, and the second vertical loader is arranged in the upper middle part of the second distribution beam;

[0015] The first distribution beam and the second distribution beam are symmetrically arranged above the test section and extend along the length direction of the test module.

[0016] Furthermore, two parallel first round steel bars and second round steel bars are provided at the bottom of both ends of the first distribution beam and the second distribution beam in the length direction, and the arrangement direction of the first round steel bars and the second round steel bars is perpendicular to the arrangement direction of the first distribution beam and the second distribution beam;

[0017] The first round steel is arranged at the connection between the test section and the first transition section; the second round steel is arranged at the connection between the test section and the second transition section.

[0018] Furthermore, the first pressure sensor is arranged at the lower end of the first vertical loader, and the second pressure sensor is arranged at the lower end of the second vertical loader.

[0019] Furthermore, the first pressure sensor and the second pressure sensor are both spoke-type pressure sensors.

[0020] Furthermore, the first supporting mechanism includes a first box beam base and a third round steel, and the third round steel is arranged above the first box beam base;

[0021] The second supporting mechanism includes a second box beam base and a fourth round steel, and the fourth round steel is arranged above the second box beam base.

[0022] Furthermore, the test section is provided with a plurality of strain gauges for measuring stress distribution on the test section, and the strain gauges are used to be connected to the strain meter.

[0023] The present invention also provides a method for conducting a test using the above reactor compartment structure internal pressure-bending combined load test device, comprising the following steps:

[0024] S1. Place the test model on the bottom support module, and place the bulkheads at both ends of the length direction of the test model on the third round steel and the fourth round steel respectively;

[0025] S2. Place the bending loading module on the test section, and set the first round steel on the transverse bulkhead at the connection between the test section and the first transition section; set the second round steel on the transverse bulkhead at the connection between the test section and the second transition section;

[0026] S3. Fix the strain gauges at the parts of the test section that need to be monitored, and connect the strain gauges to the strain meters;

[0027] S4, preloading the test model within the elastic range;

[0028] S5, setting a step-by-step loading table in the internal pressure loading control system, performing internal pressure loading, and recording data of the strain gauge, the first pressure sensor, the second pressure sensor, and the pressure gauge;

[0029] S6. Maintain the internal pressure of the first pressure chamber and the second pressure chamber at 0.5-0.8 times the test pressure, set a graded pressurization load table in the bending loading control system to achieve synchronous loading, and record the data of the strain gauge, the first pressure sensor, the second pressure sensor, and the pressure gauge;

[0030] S7, maintaining the internal pressure of the first pressure chamber and the second pressure chamber at the design pressure, setting a graded pressurization load table in the bending loading control system to achieve synchronous loading, and recording data of the strain gauge, the first pressure sensor, the second pressure sensor, and the pressure gauge;

[0031] S8, reducing the internal pressure of the first pressure chamber and the second pressure chamber to 0, and after standing still, preloading the test model again within the elastic range;

[0032] S9. A graded pressure load table is set in the bending loading control system to achieve synchronous loading, and the data of the strain gauge, the first pressure sensor, the second pressure sensor and the pressure gauge are recorded.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] Firstly, the present invention ensures that the bending load of the test model is symmetrical on the left and right sides through synchronous pressurization by two groups of vertical loaders, and that the bending load is evenly loaded from top to bottom. The pressure is loaded onto the round steel through two groups of distribution beams to reduce the use of the gantry, so that the pressure is linearly loaded on the test model. The internal pressure loading module ensures that the internal pressure load remains stable during the bending loading process through the internal pressure loading control system, and synchronous loading is ensured by controlling the internal pressure loading control system and the bending loading control system.

[0035] Secondly, the present invention simulates the load of the pressure cabin structure under dual accident conditions through the internal pressure loading module and the bending loading module, understands the structural response under the superposition of different internal pressure loads and different bending loads, and analyzes the safety and reliability of the pressure cabin structure section model under accident conditions.

[0036] Thirdly, the test module of the present invention is designed separately from the test section, the first transition section and the second transition section, which helps to accurately define the test area and extend the force arm by the transition section to facilitate the simulation of working conditions with different bending loads; by setting the first and second pressure chambers, independent loading and regulation of the internal pressure can be achieved to meet the requirements of various test conditions; the modular design facilitates the installation and adjustment of the device and is suitable for test models of different sizes.

[0037] Fourthly, the internal pressure loading module of the present invention forms a closed loop through a water tank and a pressure pump, the internal pressure is stable and can be loaded repeatedly, reducing the waste of test liquid; the outlet of the first pressure chamber is higher than the inlet, and the gravity exhaust design is used to avoid gas residue and improve the internal pressure loading accuracy; the valve on the pipeline facilitates rapid switching of the test state and enhances the operating efficiency of the device.

[0038] Fifth, the bending loading module of the present invention can accurately apply bending loads through the symmetrical distribution of the first and second vertical loading mechanisms to ensure uniform force on the test section; the concentrated load of the loader is dispersed to the test section through the distribution beam to reduce local stress concentration and improve test safety and result reliability; the position and size of the loading mechanism can be adjusted to adapt to different test models and load requirements. The loader is set in the middle of the distribution beam to ensure the directionality and stability of the applied load; the two distribution beams are symmetrically distributed on both sides of the test section to ensure balanced load application and reduce torque effects; the round steel is designed at the key connection to enhance the loading effect of the bending force and reduce displacement errors.

[0039] Sixth, the bottom support module of the present invention provides stable support through the box beam base combined with round steel, reducing the deformation of the test model caused by external interference; the positions of the support modules at both ends are clear, which is convenient for quickly placing the test model and reducing preparation time; the support modules are designed at key connection positions to ensure reasonable load transfer and avoid deformation and distortion of the model.

[0040] Seventh, the measurement module of the present invention uses spoke-type pressure sensors to monitor vertical loads and internal pressure in real time to ensure comprehensive test data; accurate pressure monitoring, with pressure gauges placed at key locations, facilitates checking system status at any time to prevent overload or pressure leakage; strain gauges are distributed on the test section to provide detailed data on stress distribution, providing a reliable basis for verification design and analysis.

[0041] In summary, the reactor compartment structure internal pressure-bending combined load test device of the present invention is comprehensively designed, covers the combined loading of internal pressure and bending load, and has the advantages of high precision, multi-function, high reliability, etc. Through modular design, optimized loading and support mechanism and detailed measurement means, it provides a reliable solution for complex load tests of reactor compartment structures, and can also provide data support for the design and optimization of similar structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of a reactor cabin structure internal pressure-bending combined load test device;

[0043] Figure 2 It is a schematic diagram of the connection between the test section and the internal pressure loading module;

[0044] Figure 3 It is a structural schematic diagram of the bending loading module;

[0045] Figure 4 is a structural schematic diagram of a first supporting mechanism;

[0046] In the figure: test section 1, first pressure chamber 101, second pressure chamber 102, first transition section 2, second transition section 3, water tank 4, pressure pump 5, first vertical loading mechanism 6, first distribution beam 601, first vertical loader 602, second vertical loading mechanism 7, second distribution beam 701, second vertical loader 702, first supporting mechanism 8, first box beam base 801, third round steel 802, second supporting mechanism 9, second box beam base 901, fourth round steel 902, first pressure sensor 10, second pressure sensor 11, pressure gauge 12, first pipeline 13, second pipeline 14, third pipeline 15, first valve 16, second valve 17, first round steel 18, second round steel 19. DETAILED DESCRIPTION

[0047] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention, and is only used as an example. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. At the same time, the advantages of the present invention will become clearer and easier to understand by explaining.

[0048] like Figure 1 As shown, a reactor cabin structure internal pressure-bending combined load test device of the present invention comprises: a test module, a bending loading module, a bottom support module and a measurement module;

[0049] The test module includes a test section 1, a first transition section 2 and a second transition section 3, the test section 1 has a first pressure chamber 101 and a second pressure chamber 102; the first transition section 2 and the second transition section 3 are symmetrically fixedly arranged at the two ends of the test section 1, respectively, and the length of the force arm for forming the bending load is extended by arranging the first transition section 2 and the second transition section 3, thereby increasing the upper limit of the bending load; an internal pressure loading module, the internal pressure loading module includes a water tank 4 and a pressure pump 5, the outlet of the water tank 4 is connected to the inlet of the first pressure chamber 101 through the pressure pump 5, the outlet of the first pressure chamber 101 is connected to the inlet of the water tank 4, and the outlet of the first pressure chamber 101 is located above the inlet of the first pressure chamber 101; the bending loading module includes a first vertical loading mechanism 6 and a second vertical loading mechanism 7, the first vertical loading mechanism 6 and the second vertical loading mechanism 7 are arranged above the test section 1 for applying a bending load to the test section; the bottom support module includes a first support mechanism 8 and a second support mechanism 9, the first support mechanism 8 and the second support mechanism 9 are respectively arranged at the bottom of the two ends of the length direction of the test module for supporting the test module; the measuring module includes a first pressure sensor 10, a second pressure sensor 11 and a pressure gauge 12, the first pressure sensor 10 and the second pressure sensor 11 are respectively used to monitor the bending loads applied to the test section by the first vertical loading mechanism 6 and the second vertical loading mechanism 7; the pressure gauge 12 is used to monitor the pressure value at the outlet of the first pressure chamber 101.

[0050] like Figure 2 As shown, the outlet of the water tank 4 is connected to the inlet of the pressure pump 5 through the first pipe 13, and the outlet of the pressure pump 5 is connected to the inlet of the first pressure chamber 101 through the second pipe 14; the outlet of the first pressure chamber 101 is connected to the inlet of the water tank 4 through the third pipe 15; the pressure gauge 12 is arranged on the third pipe 15, and in this embodiment, the pressure gauge is a liquid level pressure transmitter. A first valve 16 is arranged on the second pipe 14, and a second valve 17 is arranged on the third pipe 15. When the internal pressure loading control system is started, the pressure pump 5 draws water from the water tank 4 and injects it into the first pressure chamber 101 through the second pipe 14. When the internal pressure test value is reached, the internal pressure loading control system simultaneously closes the pressure pump 5, the first valve 16 and the second valve 17.

[0051] like Figure 3As shown, the first vertical loading mechanism 6 includes a first distribution beam 601 and a first vertical loader 602, and the first vertical loader 602 is arranged in the upper middle part of the first distribution beam 601; the first distribution beam 601 and the first vertical loader 602 are connected by bolts. The second vertical loading mechanism 7 includes a second distribution beam 701 and a second vertical loader 702, and the second vertical loader 702 is arranged in the upper middle part of the second distribution beam 701; the second distribution beam 701 and the second vertical loader 702 are connected by bolts. The first distribution beam 601 and the second distribution beam 701 are symmetrically arranged above the test section 1 and are extended in the length direction of the test module. The first vertical loader 602 and the second vertical loader 702 are used to apply pressure downward, and the first vertical loader 602 and the second vertical loader 702 are symmetrically arranged on the left and right sides.

[0052] Two parallel first round steels 18 and second round steels 19 are arranged at the bottom of both ends of the first distribution beam 601 and the second distribution beam 701 in the length direction, and the arrangement direction of the first round steel 18 and the second round steel 19 is perpendicular to the arrangement direction of the first distribution beam 601 and the second distribution beam 701; the first round steel 18 is arranged at the connection between the test section 1 and the first transition section 2; the second round steel 19 is arranged at the connection between the test section 1 and the second transition section 3.

[0053] The first pressure sensor 10 is arranged at the lower end of the first vertical loader 602, and the first pressure sensor 10 is connected to the first vertical loader 602 by bolts; the second pressure sensor 11 is arranged at the lower end of the second vertical loader 702, and the second pressure sensor 11 is connected to the second pressure sensor 11 by bolts. The first pressure sensor 10 and the second pressure sensor 11 are both spoke-type pressure sensors, and the first pressure sensor and the second pressure sensor are both connected to the computer display.

[0054] The bending loading control system is connected to the first vertical loader 602 and the second vertical loader 702 respectively. When the bending loading control system is working, it applies equal pressure to the first vertical loader 602 and the second vertical loader 702. The strain gauge is used to measure the stress of the measuring point, the first pressure sensor 10 is used to measure the pressure of the first vertical loader 602, and the second pressure sensor 11 is used to measure the second vertical loader 702. The strain gauge is set in the model test section, and the specific position of the strain gauge is arranged according to the numerical simulation results. When the bending loading control system is started, the first vertical loader 602 and the second vertical loader 702 respectively and simultaneously apply pressure to the first distribution beam 601 and the second distribution beam 701, the hull structure test model will produce sagging deformation with the pressure, and the load size is recorded in real time through the measurement module.

[0055] like Figure 1 and Figure 4As shown, the first supporting mechanism 8 includes a first box beam base 801 and a third round steel 802. The third round steel 802 is arranged above the first box beam base 801. The first box beam base 801 is composed of a plurality of box beams. Adjacent box beams are connected by bolts, and the movement of the third round steel is restricted by bolts on both sides.

[0056] The second supporting mechanism 9 includes a second box beam base 901 and a fourth round steel 902. The fourth round steel 902 is arranged above the second box beam base 901. The second box beam base 901 is composed of a plurality of box beams. Adjacent box beams are connected by bolts. The left and right sides of the fourth round steel are restricted in movement by bolts.

[0057] The method for conducting a test using the reactor compartment structure internal pressure-bending combined load test device of the present invention comprises the following steps:

[0058] S1. Place the test model on the bottom support module, and place the bulkheads at both ends of the length direction of the test model on the third round steel 802 and the fourth round steel 902 respectively;

[0059] S2. Place the bending loading module on the test section. The first round steel 18 is set on the transverse bulkhead at the connection between the test section 1 and the first transition section 2. The second round steel 19 is set on the transverse bulkhead at the connection between the test section 1 and the second transition section 3.

[0060] S3. Fix the strain gauges at the parts of the test section that need to be monitored, and connect the strain gauges to the strain meters;

[0061] S4, preloading the test model within the elastic range;

[0062] S5, setting a step-by-step loading table in the internal pressure loading control system, performing internal pressure loading, and recording data of the strain gauge, the first pressure sensor, the second pressure sensor, and the pressure gauge;

[0063] S6. Maintain the internal pressure of the first pressure chamber 101 and the second pressure chamber 102 at 0.5-0.8 times the test pressure, set a graded pressurization load table in the bending loading control system to achieve synchronous loading, and record the data of the strain gauge, the first pressure sensor, the second pressure sensor, and the pressure gauge;

[0064] S7, maintaining the internal pressure of the first pressure chamber 101 and the second pressure chamber 102 at the design pressure, setting a graded pressurization load table in the bending loading control system to achieve synchronous loading, and recording the data of the strain gauge, the first pressure sensor, the second pressure sensor and the pressure gauge;

[0065] S8, reducing the internal pressure of the first pressure chamber 101 and the second pressure chamber 102 to 0, and after standing still, preloading the test model again within the elastic range;

[0066] S9. A graded pressure load table is set in the bending loading control system to achieve synchronous loading, and the data of the strain gauge, the first pressure sensor, the second pressure sensor and the pressure gauge are recorded.

[0067] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

Claims

1. A reactor compartment structure internal pressure-bending combined load test device, characterized in that: include: A test module, the test module comprising a test section (1), a first transition section (2) and a second transition section (3), the test section (1) having a first pressure chamber (101) and a second pressure chamber (102); the first transition section (2) and the second transition section (3) are respectively fixedly arranged at two ends of the test section (1) for extending the length of a force arm for forming a bending load; An internal pressure loading module, the internal pressure loading module comprising a water tank (4) and a pressure pump (5), the outlet of the water tank (4) being connected to the inlet of the first pressure chamber (101) through the pressure pump (5), the outlet of the first pressure chamber (101) being connected to the inlet of the water tank (4), and the outlet of the first pressure chamber (101) being located above the inlet of the first pressure chamber (101); A bending loading module, the bending loading module comprising a first vertical loading mechanism (6) and a second vertical loading mechanism (7), the first vertical loading mechanism (6) and the second vertical loading mechanism (7) being arranged above the test section (1) for applying a bending load to the test section; A bottom support module, the bottom support module comprising a first support mechanism (8) and a second support mechanism (9), the first support mechanism (8) and the second support mechanism (9) being respectively arranged at the bottom of both ends of the test module in the length direction for supporting the test module; A measuring module, the measuring module comprising a first pressure sensor (10), a second pressure sensor (11) and a pressure gauge (12), the first pressure sensor (10) and the second pressure sensor (11) being used to monitor the bending load applied to the test section by the first vertical loading mechanism (6) and the second vertical loading mechanism (7), respectively; the pressure gauge (12) being used to monitor the pressure value at the outlet of the first pressure chamber (101).

2. The reactor compartment structure internal pressure-bending combined load test device according to claim 1, characterized in that: The outlet of the water tank (4) is connected to the inlet of the pressure pump (5) via a first pipe (13), and the outlet of the pressure pump (5) is connected to the inlet of the first pressure chamber (101) via a second pipe (14); the outlet of the first pressure chamber (101) is connected to the inlet of the water tank (4) via a third pipe (15); and the pressure gauge (12) is arranged on the third pipe (15).

3. The reactor compartment structure internal pressure-bending combined load test device according to claim 2, characterized in that: The second pipeline (14) is provided with a first valve (16), and the third pipeline (15) is provided with a second valve (17).

4. The reactor compartment structure internal pressure-bending combined load test device according to claim 3, characterized in that: The first vertical loading mechanism (6) comprises a first distribution beam (601) and a first vertical loader (602), wherein the first vertical loader (602) is arranged in the upper middle portion of the first distribution beam (601); The second vertical loading mechanism (7) comprises a second distribution beam (701) and a second vertical loader (702), wherein the second vertical loader (702) is arranged in the upper middle portion of the second distribution beam (701); The first distribution beam (601) and the second distribution beam (701) are symmetrically arranged above the test section (1) and are arranged to extend in the length direction of the test module.

5. The reactor compartment structure internal pressure-bending combined load test device according to claim 4, characterized in that: Two parallel first round steels (18) and second round steels (19) are provided at the bottom of both ends of the first distribution beam (601) and the second distribution beam (701) in the length direction, and the arrangement direction of the first round steel (18) and the second round steel (19) is perpendicular to the arrangement direction of the first distribution beam (601) and the second distribution beam (701); The first round steel (18) is arranged at the connection between the test section (1) and the first transition section (2); the second round steel (19) is arranged at the connection between the test section (1) and the second transition section (3).

6. The reactor compartment structure internal pressure-bending combined load test device according to claim 5, characterized in that: The first pressure sensor (10) is arranged at the lower end of the first vertical loader (602), and the second pressure sensor (11) is arranged at the lower end of the second vertical loader (702).

7. The reactor compartment structure internal pressure-bending combined load test device according to claim 6, characterized in that: The first pressure sensor (10) and the second pressure sensor (11) are both spoke-type pressure sensors.

8. The reactor compartment structure internal pressure-bending combined load test device according to any one of claims 1 to 7, characterized in that: The first supporting mechanism (8) comprises a first box beam base (801) and a third round steel (802), wherein the third round steel (802) is arranged above the first box beam base (801); The second supporting mechanism (9) comprises a second box beam base (901) and a fourth round steel (902), wherein the fourth round steel (902) is arranged above the second box beam base (901).

9. The reactor compartment structure internal pressure-bending combined load test device according to any one of claims 1 to 7, characterized in that: The test section (1) is provided with a plurality of strain gauges for measuring stress distribution on the test section, and the strain gauges are used to be connected to a strain meter.

10. A method for conducting a test using the reactor compartment structure internal pressure-bending combined load test device according to any one of claims 1 to 9, characterized in that: The steps include: S1. Place the test model on the bottom support module, and place the bulkheads at both ends of the test model in the length direction on the third round steel (802) and the fourth round steel (902) respectively; S2, placing the bending loading module on the test section, the first round steel (18) being arranged on the transverse bulkhead at the connection between the test section (1) and the first transition section (2); the second round steel (19) being arranged on the transverse bulkhead at the connection between the test section (1) and the second transition section (3); S3. Fix the strain gauges at the parts of the test section that need to be monitored, and connect the strain gauges to the strain meters; S4, preloading the test model within the elastic range; S5, setting a step-by-step loading table in the internal pressure loading control system, performing internal pressure loading, and recording data of the strain gauge, the first pressure sensor, the second pressure sensor, and the pressure gauge; S6, maintaining the internal pressure of the first pressure chamber (101) and the second pressure chamber (102) at 0.5-0.8 times the test pressure, setting a graded pressurization load table in the bending loading control system to achieve synchronous loading, and recording data of the strain gauge, the first pressure sensor, the second pressure sensor, and the pressure gauge; S7, maintaining the internal pressure of the first pressure chamber (101) and the second pressure chamber (102) at the design pressure, setting a graded pressurization load table in the bending loading control system to achieve synchronous loading, and recording data of the strain gauge, the first pressure sensor, the second pressure sensor, and the pressure gauge; S8, reducing the internal pressure of the first pressure chamber (101) and the second pressure chamber (102) to 0, leaving them to stand, and then preloading the test model again within the elastic range; S9. A graded pressure load table is set in the bending loading control system to achieve synchronous loading, and the data of the strain gauge, the first pressure sensor, the second pressure sensor and the pressure gauge are recorded.

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