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

Abstract

The application discloses a reactor cabin structure internal pressure-bending combined load test device and a test method thereof. The device comprises a test module, wherein 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; an internal pressure loading module, wherein the internal pressure loading module comprises a water tank and a pressure pump; a bending loading module, wherein the bending loading module comprises a first vertical loading mechanism and a second vertical loading mechanism; a bottom support module, wherein the bottom support module comprises a first support mechanism and a second support mechanism; and a measurement module, wherein the measurement module comprises a first pressure sensor, a second pressure sensor and a pressure gauge. The internal pressure loading module and the bending loading module are used for simulating the load under the double-accident working condition of the pressure cabin structure, the structural response under the superposition of different internal pressure loads and different bending loads is known, and the safety and reliability of the pressure cabin structure cabin section model under the accident working condition are analyzed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hull girder bending test, and particularly relates to a reactor containment structure internal pressure-bending combined load test device and a test method thereof. BACKGROUND

[0002] During actual operation, nuclear power ships may have accidents, and even ship breakage, capsizing and sinking may occur. Therefore, it is a complex and unavoidable problem in the ship structure design stage to ensure the safety and stability of the pressure containment structure under accident conditions.

[0003] At present, there are test platforms for hull girder bending, and there are test methods for pressurizing pressure containment models, but there is still a lack of effective means for internal pressure-bending combined loading, and a model can only complete one test, the utilization rate of the test model is low, and the test period is long. SUMMARY

[0004] The purpose of the present application is to solve the problems in the background art, and to provide a reactor containment structure internal pressure-bending combined load test device and a test method thereof.

[0005] To achieve the above purpose, the present application designs a reactor containment structure internal pressure-bending combined load test device, which comprises:

[0006] The test module comprises a test section, a first transition section and a second transition section, and the test section has a first pressure tank and a second pressure tank; the first transition section and the second transition section are fixedly arranged at both ends of the test section, respectively, for lengthening the length of the force arm forming the bending load;

[0007] The internal pressure loading module comprises a water tank and a pressure pump, the outlet of the water tank is communicated with the inlet of the first pressure tank through the pressure pump, the outlet of the first pressure tank is communicated with the inlet of the water tank, and the outlet of the first pressure tank is located above the inlet of the first pressure tank; 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 tank is higher than the inlet, the residual gas is avoided by using the gravity exhaust design, and the internal pressure loading precision is improved;

[0008] The bending loading module comprises a first vertical loading mechanism and a second vertical loading mechanism, and the first vertical loading mechanism and the second vertical loading mechanism are arranged above the test section for applying bending load to the test section;

[0009] The bottom support module comprises a first support mechanism and a second support mechanism, and the first support mechanism and the second support mechanism are arranged at the bottom of the length direction of the test module for supporting the test module;

[0010] a measuring module, the measuring module comprising a first pressure sensor, a second pressure sensor and a pressure gauge, the first pressure sensor and the second pressure sensor being used to monitor the first vertical loading mechanism and the second vertical loading mechanism to apply bending load to the test section respectively; the pressure gauge being used to monitor the pressure value at the outlet of the first pressure tank.

[0011] Further, the outlet of the water tank is connected with the inlet of the pressure pump through a first pipeline, the outlet of the pressure pump is connected with the inlet of the first pressure tank through a second pipeline; the outlet of the first pressure tank is connected with the inlet of the water tank through a third pipeline; the pressure gauge is arranged on the third pipeline.

[0012] Further, the first pipeline is provided with a first valve, and the third pipeline is provided with a second valve.

[0013] Further, the first vertical loading mechanism comprises a first distribution beam and a first vertical loader, and the first vertical loader is arranged at the upper middle part of the first distribution beam.

[0014] The second vertical loading mechanism comprises a second distribution beam and a second vertical loader, and the second vertical loader is arranged at 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] Further, the first distribution beam and the second distribution beam are provided with two first round steels and two second round steels arranged in parallel at the bottom of the length direction of the first distribution beam and the second distribution beam, and the arrangement direction of the first round steels and the second round steels 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; and the second round steel is arranged at the connection between the test section and the second transition section.

[0018] Further, 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] Further, the first pressure sensor and the second pressure sensor are both spoke type pressure sensors.

[0020] Further, the first support mechanism comprises 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 support mechanism comprises a second box beam base and a fourth round steel, and the fourth round steel is arranged above the second box beam base.

[0022] Further, a plurality of strain gauges for measuring stress distribution on the test section are arranged on the test section, and the strain gauges are connected with strain gauges.

[0023] The application also provides a method for testing by using the reactor cavity structure internal pressure-bending combined load testing device, comprising the following steps:

[0024] S1, placing the test model on the bottom support module, and placing the length direction two ends of the test model on the third round steel and the fourth round steel respectively;

[0025] S2, placing the bending load module on the test section, and placing the first round steel on the transverse bulkhead at the connecting position of the test section and the first transition section; and placing the second round steel on the transverse bulkhead at the connecting position of the test section and the second transition section;

[0026] S3, fixing the strain gauges on the parts to be monitored of the test section, and connecting the strain gauges with strain gauges;

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

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

[0029] S6, maintaining the internal pressure of the first pressure tank and the second pressure tank at 0.5-0.8 times of the test pressure, setting a step-by-step loading table in the bending load control system, realizing synchronous loading, and recording the data of the strain gauges, the first pressure sensor, the second pressure sensor and the pressure gauge;

[0030] S7, maintaining the internal pressure of the first pressure tank and the second pressure tank at the design pressure, setting a step-by-step loading table in the bending load control system, realizing synchronous loading, and recording the data of the strain gauges, the first pressure sensor, the second pressure sensor and the pressure gauge;

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

[0032] S9, setting a step-by-step loading table in the bending load control system to realize synchronous loading, and recording the data of the strain gauges, the first pressure sensor, the second pressure sensor and the pressure gauge.

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

[0034] Firstly, the present application synchronously pressurizes through two groups of vertical loaders, ensures the symmetry of the bending load of the test model on the left and right sides, ensures the uniform loading of the bending load from top to bottom, reduces the use of the portal frame by loading the pressure on the round steel through two groups of distribution beams, makes the pressure linearly loaded on the test model, ensures the stability of the internal pressure load in the bending loading process through the internal pressure loading control system, and ensures the realization of synchronous loading through the control of the internal pressure loading control system and the bending loading control system.

[0035] Secondly, the present application simulates the load under the double accident conditions of the pressure cabin structure 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 cabin segment model of the pressure cabin structure under the accident conditions.

[0036] Thirdly, the test module of the present application is designed by separating the test section, the first transition section and the second transition section, which is helpful to accurately define the test area, and the force arm is lengthened through the transition section, which is convenient for simulating the working conditions of different bending loads; the independent loading and regulation of the internal pressure can be realized through the setting of the first and second pressure cabins, which meets the demand of various test conditions; the modular design is convenient for 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 application forms a closed loop through the water tank and the pressure pump, the internal pressure is stable and can be repeatedly loaded, and the waste of test liquid is reduced; the outlet of the first pressure cabin is higher than the inlet, the residual gas is avoided by using the gravity exhaust design, and the internal pressure loading accuracy is improved; the valve on the pipeline facilitates the rapid switching of the test state, and enhances the operation efficiency of the device.

[0038] Fifthly, the bending loading module of the present application is distributed symmetrically through the first and second vertical loading mechanisms, which can accurately apply bending load and ensure the uniform stress of the test section; the concentrated load of the loader is dispersed to the test section through the distribution beam, which reduces the local stress concentration and improves the test safety and reliability of the results; the position and size of the loading mechanism can be adjusted to adapt to different test models and load requirements. The loader is arranged 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 the balance of the applied load and reduce the torque effect; the round steel is designed at the key connection to enhance the loading effect of the bending force and reduce the displacement error.

[0039] Sixthly, the bottom support module of the present application provides stable support through the box beam base combined with the round steel, reduces the deformation of the test model caused by external interference; the positions of the two end support modules are clear, which facilitates the quick placement of the test model and reduces the preparation time; the support modules are designed at the key connection parts to ensure reasonable load transmission and avoid model distortion.

[0040] Seventhly, the measuring module of the present application monitors the vertical load and internal pressure in real time by adopting a spoke type pressure sensor, ensures comprehensive test data, and provides reliable basis for verification design and analysis through accurate pressure monitoring and stress distribution data provided by the strain gauges distributed on the test section.

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

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

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

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

[0045] Figure 4 Fig. 4 is a structural schematic diagram of the 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 pipe 13, second pipe 14, third pipe 15, first valve 16, second valve 17, first round steel 18, second round steel 19. DETAILED DESCRIPTION

[0047] The specific embodiments of the present application will be 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 application, but does not constitute a limitation of the present application, and is only exemplary. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other. At the same time, it will become clearer and easier to understand the advantages of the present application.

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

[0049] The test module comprises 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 fixed at both ends of the test section 1 respectively, the force arm length of the bending load is extended by setting the first transition section 2 and the second transition section 3, and the upper limit of the bending load is increased; the internal pressure loading module comprises a water tank 4 and a pressure pump 5, the outlet of the water tank 4 is communicated with the inlet of the first pressure chamber 101 through the pressure pump 5, the outlet of the first pressure chamber 101 is communicated with 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 load module comprises 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 bending load to the test section; the bottom support module comprises a first support mechanism 8 and a second support mechanism 9, the first support mechanism 8 and the second support mechanism 9 are arranged at the bottom of both ends of the length direction of the test module for supporting the test module; the measurement module comprises 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 used for monitoring 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 is used for monitoring the pressure value at the outlet of the first pressure chamber 101.

[0050] As Figure 2 shown, the outlet of the water tank 4 is connected with the inlet of the pressure pump 5 through a first pipeline 13, the outlet of the pressure pump 5 is connected with the inlet of the first pressure chamber 101 through a second pipeline 14; the outlet of the first pressure chamber 101 is connected with the inlet of the water tank 4 through a third pipeline 15; the pressure gauge 12 is arranged on the third pipeline 15, and in the embodiment, the pressure gauge is a liquid level pressure transmitter. A first valve 16 is arranged on the second pipeline 14, and a second valve 17 is arranged on the third pipeline 15. When the internal pressure loading control system is started, the pressure pump 5 pumps water from the water tank 4, injects into the first pressure chamber 101 through the second pipeline 14, and when the internal pressure experimental 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] As 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 at the upper middle part of the first distribution beam 601; the first distribution beam 601 is connected with the first vertical loader 602 through 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 at the upper middle part of the second distribution beam 701; the second distribution beam 701 is connected with the second vertical loader 702 through bolts. The first distribution beam 601 and the second distribution beam 701 are symmetrically arranged above the test section 1 and extend along the length direction of the test module. The first vertical loader 602 and the second vertical loader 702 are used for applying downward pressure, and the first vertical loader 602 and the second vertical loader 702 are symmetrically arranged on the left and right sides.

[0052] The first distribution beam 601 and the second distribution beam 701 are provided with two first round steels 18 and two second round steels 19 arranged in parallel at the bottom of the length direction of the two ends, and the arrangement direction of the first round steels 18 and the second round steels 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; and 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 with the first vertical loader 602 through 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 with the second pressure sensor 11 through 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 a computer display.

[0054] The bending loading control system is connected with the first vertical loader 602 and the second vertical loader 702. When the bending loading control system works, the same pressure is applied to the first vertical loader 602 and the second vertical loader 702. The strain gauge is used for measuring the stress of the measuring point, the first pressure sensor 10 is used for measuring the pressure of the first vertical loader 602, and the second pressure sensor 11 is used for measuring the second vertical loader 702. The strain gauge is arranged on the model test section, and the specific position of the strain gauge is arranged according to the numerical simulation result. When the bending loading control system starts, the first vertical loader 602 and the second vertical loader 702 apply pressure to the first distribution beam 601 and the second distribution beam 701 respectively and simultaneously, and the ship structure test model will produce sagging deformation with the pressure, and at this time, the load size is recorded in real time through the measuring module.

[0055] As Figure 1 and Figure 4As shown, the first support mechanism 8 includes a first box girder base 801 and a third round steel 802, the third round steel 802 is arranged above the first box girder base 801, the first box girder base 801 is composed of a plurality of box girders, adjacent box girders are connected by bolts, and the left and right sides of the third round steel are limited to move by bolts.

[0056] The second support mechanism 9 includes a second box girder base 901 and a fourth round steel 902, the fourth round steel 902 is arranged above the second box girder base 901, the second box girder base 901 is composed of a plurality of box girders, adjacent box girders are connected by bolts, and the left and right sides of the fourth round steel are limited to move by bolts.

[0057] The method for testing by using the reactor cavity structure internal pressure-bending combined load test device is as follows.

[0058] S1, the test model is placed on the bottom support module, and the length direction two ends of the test model are placed on the third round steel 802 and the fourth round steel 902 respectively.

[0059] S2, the bending load module is placed on the test section, the first round steel 18 is arranged on the transverse bulkhead at the connection between the test section 1 and the first transition section 2, and the second round steel 19 is arranged on the transverse bulkhead at the connection between the test section 1 and the second transition section 3.

[0060] S3, the strain gauges are fixedly arranged at the positions required to be monitored of the test section, and the strain gauges are connected with strain indicators.

[0061] S4, the test model is preloaded in an elastic range.

[0062] S5, a step-by-step loading table is set in the internal pressure loading control system, the internal pressure is loaded, and the data of the strain indicator, the first pressure sensor, the second pressure sensor and the pressure gauge are recorded.

[0063] S6, the internal pressure of the first pressure tank 101 and the second pressure tank 102 is maintained at 0.5-0.8 times of the test pressure, a step-by-step loading table is set in the bending load control system, synchronous loading is realized, and the data of the strain indicator, the first pressure sensor, the second pressure sensor and the pressure gauge are recorded.

[0064] S7, the internal pressure of the first pressure tank 101 and the second pressure tank 102 is maintained at the design pressure, a step-by-step loading table is set in the bending load control system, synchronous loading is realized, and the data of the strain indicator, the first pressure sensor, the second pressure sensor and the pressure gauge are recorded.

[0065] S8, the internal pressure of the first pressure tank 101 and the second pressure tank 102 is reduced to 0, and after standing, the test model is preloaded in an elastic range again.

[0066] S9, set the staged pressure loading table in the bending loading control system to realize synchronous loading, and record the data of the strain gauge, the first pressure sensor, the second pressure sensor, and the pressure gauge.

[0067] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application shall be covered within the protection scope of the present application. The contents not described in detail in the specification belong to the prior art known by the professional technicians.

Claims

1. A reactor vessel structure internal pressure-bending combined load test apparatus, characterized by: The utility model relates to a test module, an internal pressure loading module, a bending loading module, a bottom support module and a measuring module, and the test module comprises a test section (1), a first transition section (2) and a second transition section (3), the test section (1) has a first pressure cabin (101) and a second pressure cabin (102), the first transition section (2) and the second transition section (3) are fixedly arranged at the two ends of the test section (1) respectively and are used for lengthening the length of the force arm of the bending load, The internal pressure loading module comprises a water tank (4) and a pressure pump (5), the outlet of the water tank (4) is communicated with the inlet of the first pressure cabin (101) through the pressure pump (5), the outlet of the first pressure cabin (101) is communicated with the inlet of the water tank (4), and the outlet of the first pressure cabin (101) is located above the inlet of the first pressure cabin (101), The bending loading module comprises 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) and are used for applying the bending load to the test section, The bottom support module comprises a first support mechanism (8) and a second support mechanism (9), the first support mechanism (8) and the second support mechanism (9) are arranged at the bottom of the two ends of the length direction of the test module and are used for supporting the test module, The measuring module comprises 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 used for monitoring the bending load applied to the test section by the first vertical loading mechanism (6) and the second vertical loading mechanism (7) respectively, and the pressure gauge (12) is used for monitoring the pressure value at the outlet of the first pressure cabin (101), The first vertical loading mechanism (6) comprises a first distribution beam (601) and a first vertical loader (602), the first vertical loader (602) is arranged above the middle part of the first distribution beam (601), The second vertical loading mechanism (7) comprises a second distribution beam (701) and a second vertical loader (702), the second vertical loader (702) is arranged above the middle part 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 extend along the length direction of the test module, The length direction two ends of the first distribution beam (601) and the second distribution beam (701) are provided with two first round steels (18) and second round steels (19) arranged in parallel, 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 connecting position of the test section (1) and the first transition section (2), and the second round steel (19) is arranged at the connecting position of the test section (1) and the second transition section (3), A plurality of strain gauges for measuring the stress distribution on the test section are arranged on the test section (1), and the strain gauges are connected with strain gauges. ​ 2. The reactor vessel internal pressure-bending combined load test apparatus according to Claim 1, characterized by: The outlet of the water tank (4) is connected with the inlet of the pressure pump (5) through a first pipeline (13), the outlet of the pressure pump (5) is connected with the inlet of the first pressure cabin (101) through a second pipeline (14), the outlet of the first pressure cabin (101) is connected with the inlet of the water tank (4) through a third pipeline (15), and the pressure gauge (12) is arranged on the third pipeline (15).

3. The reactor vessel internal pressure-bending combined load test apparatus according to claim 2, characterized by: The first valve (16) is arranged on the second pipeline (14), and the second valve (17) is arranged on the third pipeline (15).

4. The reactor vessel internal pressure-bending combined load test apparatus according to Claim 3, characterized by: 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).

5. The reactor vessel internal pressure-bending combined load test apparatus according to claim 4, characterized by: The first pressure sensor (10) and the second pressure sensor (11) are both spoke type pressure sensors.

6. The reactor vessel internal pressure-bending combined load test apparatus according to any one of claims 1 to 5, characterized by: The first support mechanism (8) comprises a first box beam base (801) and a third round steel (802), and the third round steel (802) is arranged above the first box beam base (801). The second support mechanism (9) comprises a second box beam base (901) and a fourth round steel (902), and the fourth round steel (902) is arranged above the second box beam base (901).

7. A method of testing using the reactor vessel structure internal pressure-bending combined load testing apparatus according to any one of claims 1 to 6, characterized by: The method comprises the following steps: S1, placing the test model on the bottom support module, and placing the bulkheads at the two ends of the length direction of the test model on the third round steel (802) and the fourth round steel (902) respectively; S2, placing the bending loading module on the test section, arranging the first round steel (18) on the transverse bulkhead at the connection between the test section (1) and the first transition section (2), and arranging the second round steel (19) on the transverse bulkhead at the connection between the test section (1) and the second transition section (3); S3, fixing the strain gauges at the positions required to be monitored on the test section, and connecting the strain gauges with strain indicators; 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 the data of the strain indicators, the first pressure sensor, the second pressure sensor and the pressure gauge; S6, maintaining the internal pressure of the first pressure cabin (101) and the second pressure cabin (102) at 0.5-0.8 times the test pressure, setting a step-by-step loading table in the bending loading control system, realizing synchronous loading, and recording the data of the strain indicators, the first pressure sensor, the second pressure sensor and the pressure gauge; S7, maintaining the internal pressure of the first pressure cabin (101) and the second pressure cabin (102) at the design pressure, setting a step-by-step loading table in the bending loading control system, realizing synchronous loading, and recording the data of the strain indicators, the first pressure sensor, the second pressure sensor and the pressure gauge; S8, reducing the internal pressure of the first pressure cabin (101) and the second pressure cabin (102) to 0, and preloading the test model within the elastic range again after standing still; S9, setting a step-by-step loading table in the bending loading control system to realize synchronous loading, and recording the data of the strain indicators, the first pressure sensor, the second pressure sensor and the pressure gauge.

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