A connection structure durability test device and test method thereof

Abstract

The present application provides a connection structure durability test device and a test method thereof, wherein the connection structure durability test device includes: a frame, a bearing base is provided at the bottom of the frame, and a connecting rib is provided at the top, and the bearing base and the connecting rib are provided with a first space; a connecting structure is passed through the connecting rib; a wind simulation mechanism, the wind simulation mechanism is provided in the first space and is connected to the connecting structure, and the wind simulation mechanism can be used to provide pulsating wind pressure to the connecting structure; a gravity simulation mechanism, the gravity simulation mechanism is provided on the bearing base, one end of which is connected to the connecting structure, and the gravity simulation mechanism is used to simulate the constant uniformly distributed load of gravity borne in actual applications; a control mechanism, the control mechanism is used to drive the wind simulation mechanism to operate and record the test time; by simulating the stress conditions of the connection structure in actual use, the tolerance of the connection structure is obtained, which provides a basis for infrastructure construction and improves the stability of infrastructure construction.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical testing and simulation of heat exchangers, and in particular to a connection structure durability testing device and a testing method thereof. Background Art

[0002] With the development of science and technology, the ultra-gravity centrifuge simulation device has become the world's leading and most widely used ultra-gravity multi-science comprehensive test platform. This device includes a fixed wall and a vacuum container connected to the fixed wall. There are temperature requirements inside the vacuum container. An ultra-large centrifugal fan is installed in the vacuum container. The supporting nodes connecting the vacuum container and the fixed wall are the connecting ribs connecting the fixed wall and the connecting bolts connecting the vacuum container to the frame; this connecting bolt bears the gravity of the connecting frame and the wind pressure of the centrifugal fan. It is particularly important to understand the service life of the connecting bolts before installation. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, the present application aims to provide a connection structure durability test device and a test method thereof.

[0004] In a first aspect, the present application provides a connection structure durability test device, wherein the connection structure is used to connect a skeleton and a connecting rib, and the test device comprises:

[0005] A frame, wherein the bottom of the frame has a bearing base, the top of the frame is provided with the connecting rib, and a first space is formed between the bearing base and the connecting rib; the connecting structure is penetrated by the connecting rib, and the extending direction of the connecting structure is the first direction;

[0006] a wind simulation mechanism, the wind simulation mechanism being disposed in the first space and connected to the connecting structure, the wind simulation mechanism being configured to provide pulsating wind pressure to the connecting structure;

[0007] A gravity simulation mechanism, which is provided on the bearing base and connected to the connecting structure at one end, and is used to simulate the constant uniformly distributed gravity load borne in actual applications;

[0008] A control mechanism is electrically connected to the wind simulation mechanism, and is used to drive the wind simulation mechanism to operate and record the test time.

[0009] According to the technical solution provided in the embodiment of the present application, it also includes a C-shaped gasket connected to the connecting structure and arranged in the first space, the C-shaped gasket is connected to a simplified simulation mechanism at the end away from the connecting structure, and the simplified simulation mechanism is connected to the wind simulation mechanism at the end away from the C-shaped gasket; the simplified simulation mechanism is used to simulate the connecting skeleton.

[0010] According to the technical solution provided in the embodiment of the present application, the simplified simulation mechanism is connected to a hinge assembly away from the C-shaped gasket end, the hinge assembly is hinged to the wind simulation mechanism away from the C-shaped gasket end, and the hinge assembly is used to eliminate additional bending moment.

[0011] According to the technical solution provided in the embodiment of the present application, the hinge assembly includes:

[0012] a first connecting member, the first connecting member being disposed at an end of the wind simulation mechanism close to the hinge assembly, the first connecting member defining a second space therein, and the first connecting member being provided with a first through hole communicating with the second space, the axis of the first through hole being directed in a second direction, the second direction being perpendicular to the first direction;

[0013] a second connecting member, the second connecting member being disposed in the second space, the second connecting member being provided with a second through hole, the axis direction of the second through hole being the second direction;

[0014] A first fixing member passes through the first through hole and the second through hole to fix the first connecting member and the second connecting member.

[0015] According to the technical solution provided in the embodiment of the present application, the gravity simulation mechanism includes a first bracket arranged on the bearing base, the extension direction of the first bracket is the first direction, and the first bracket is provided with two first clamping members along the third direction away from the top end of the bearing base, and the third direction is perpendicular to the second direction and the first direction; a first rotating member is provided between the two first clamping members, and the two ends of the first rotating member are rotatably connected to the first clamping member, the axial direction of the first rotating member is the third direction, and the first rotating member is provided with a connecting rope away from the bearing base. One end of the connecting rope is connected to the simplified simulation mechanism, and the other end is connected to the weight, and the weight is provided outside the first space.

[0016] According to the technical solution provided in the embodiment of the present application, the wind simulation mechanism is an electromagnetic vibration table.

[0017] In a second aspect, the present application proposes a test method for the above-mentioned connection structure durability test device, comprising the following steps:

[0018] Set the preset lifespan;

[0019] Constructing a lifespan conversion model, wherein the lifespan conversion model is used to eliminate fatigue damage of metal structures;

[0020] Inputting the preset life span into the life span conversion model to obtain a first life span;

[0021] Constructing a frequency acceleration model, wherein the frequency acceleration model is used to accelerate the test process with frequency;

[0022] Inputting the first life span into the frequency acceleration model to obtain a second life span;

[0023] Constructing an amplitude acceleration model, wherein the amplitude acceleration model is used to accelerate the test process by amplitude intensification;

[0024] Inputting the second life span into the amplitude acceleration model to obtain a third life span;

[0025] Assembling the test device;

[0026] Starting the wind simulation mechanism, wherein the wind simulation mechanism operates for a duration equal to the third lifespan;

[0027] When the third life span is reached, the state of the connection structure is observed. If the connection structure is not damaged, it means that the life span of the connection structure can be the preset life span.

[0028] According to the technical solution provided in the embodiment of the present application, the life span conversion model is shown as follows:

[0029]

[0030] Among them, T R is the first life span, T0 is the preset life span, r is the confidence level, R(T0) is the reliability within the preset life span T0, m is the shape parameter of the Weibull distribution, and n is the test sample size.

[0031] According to the technical solution provided in the embodiment of the present application, the frequency acceleration model is shown as follows:

[0032]

[0033] Among them, T f is the second lifespan, w R is the dynamic response frequency before acceleration, w f Frequency after acceleration.

[0034] According to the technical solution provided in the embodiment of the present application, the amplitude acceleration model is shown as follows:

[0035]

[0036] Among them, T S is the third life span, and A is the test acceleration factor.

[0037] In summary, the present application proposes a connection structure durability test device, which comprises a frame with a bearing base, a connection structure provided on a connecting rib at the top of the frame, a wind simulation mechanism for providing pulsating wind pressure to the connection structure between the connecting rib and the bearing base, and a gravity simulation mechanism for applying a constant uniformly distributed gravity load to the connection structure on the bearing base; the test device also comprises a control mechanism electrically connected to the wind simulation mechanism, and the control mechanism is used to control the action of the wind simulation mechanism. When in use, under the dual action of the wind simulation mechanism and the gravity simulation mechanism, the stress conditions in actual use are simulated, and the state of the connection structure is observed during the test time to judge the service life of the connection structure, thereby obtaining the durability of the connection structure. The present application obtains the tolerance of the connection structure by simulating the stress conditions of the connection structure in actual use, provides a basis for infrastructure construction, and improves the stability of infrastructure construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic structural diagram of a connection structure durability test device provided in an embodiment of the present application;

[0039] Figure 2 A side view of a connection structure durability test device provided in an embodiment of the present application;

[0040] Figure 3 A schematic structural diagram of a connecting frame and connecting ribs using connecting bolts in practical applications is provided for the embodiment of the present application;

[0041] Figure 4 Flowchart of the test method of the test device provided in the embodiment of the present application.

[0042] The text annotations in the figure represent:

[0043] 1. Connection structure; 11. First connection structure group; 12. Second connection structure group; 13. Nut; 2. Frame; 21. Bearing base; 22. First space; 23. Oblique bracket; 3. Connecting rib; 4. Wind simulation mechanism; 5. Gravity simulation mechanism; 51. First bracket; 52. First clamping member; 53. First rotating member; 6. C-type gasket; 61. First gasket; 62. Second gasket; 7. Simplified simulation mechanism; 71. Square structure; 8. Articulated assembly; 81. First connecting member; 82. Second connecting member; 83. First fixing member; 9. Connecting skeleton. DETAILED DESCRIPTION

[0044] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0045] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0046] Example 1

[0047] As mentioned in the background technology, in order to solve the problems in the prior art, this application proposes a connection structure durability test device, wherein the connection structure 1 is used to connect the skeleton 9 and the connection rib 3. Figure 1 Shown, including:

[0048] The frame 2 has a bearing base 21 at the bottom, and the connecting rib 3 is provided at the top of the frame 2, and a first space 22 is formed between the bearing base 21 and the connecting rib 3; the connecting structure 1 is penetrated by the connecting rib 3, and the extending direction of the connecting structure 1 is a first direction; wherein, the first direction is perpendicular to the plane where the bearing base 21 is located, the frame 2 is trapezoidal, the bearing base 21 is its bottom surface, the connecting rib 3 is a rectangular plate, and the four corners of the bearing base 21 are connected to the oblique bracket 23 by M30 screws, and the top of the oblique bracket 23 is fixedly connected to the four corners of the connecting rib 3 by M20 screws; in some specific scenarios, the connecting structure 1 is a T-shaped connecting bolt, the head of which is located above the connecting rib 3, and the screw penetrates the connecting rib 3 and extends into the first space 22;

[0049] a wind simulation mechanism 4, which is disposed in the first space 22 and connected to the connection structure 1, and can be used to provide pulsating wind pressure to the connection structure 1; the pressure direction of the pulsating wind pressure is perpendicular to the head end face of the connection bolt;

[0050] A gravity simulation mechanism 5, which is provided on the bearing base 21 and connected to the connecting structure 1 at one end. The gravity simulation mechanism 5 is used to simulate the constant uniformly distributed gravity load borne in actual applications;

[0051] A control mechanism is electrically connected to the wind simulation mechanism 4, and the control mechanism is used to drive the wind simulation mechanism 4 to operate and record the test time; when in use, under the dual action of the wind simulation mechanism 4 and the gravity simulation mechanism 5, the stress conditions of the connection structure 1 during actual use are simulated, and the state of the connection structure 1 is observed during the test time to judge the service life of the connection structure 1, thereby obtaining the durability of the connection structure 1. This application obtains the tolerance of the connection structure 1 by simulating the stress conditions of the connection structure 1 during actual use, provides a basis for infrastructure construction, and improves the stability of infrastructure construction.

[0052] Furthermore, if Figure 2 As shown, the test device also includes a C-shaped gasket 6 connected to the connecting structure 1 and arranged in the first space 22, and the end of the C-shaped gasket 6 away from the connecting structure 1 is connected to a simplified simulation mechanism 7, and the end of the simplified simulation mechanism 7 away from the C-shaped gasket 6 is connected to the wind simulation mechanism 4; the simplified simulation mechanism 7 is used to simulate the connecting skeleton 9; optionally, the C-shaped gasket 6 is a 15mm thick polytetrafluoroethylene gasket. In certain specific scenarios, when the frame 2 is placed horizontally, the connecting rib 3 is provided with a first connecting structure group 11 and a second connecting structure group 1 in the horizontal direction. 2, the first connection structure group 11 and the second connection structure group 12 each include two connection structures 1; the C-shaped gasket 6 includes a first gasket 61 and a second gasket 62 arranged in the horizontal direction corresponding to the first connection structure group 11 and the second connection structure group, both of which include a vertical portion and a transverse portion provided at both ends of the vertical portion, the screw of the connecting bolt of the first connection structure group 11 passes through the connecting rib 3 and the transverse portion above the first gasket 61; the connection structure 1 also includes a nut 13 threadedly connected to the screw; in addition, in actual use, if Figure 3 As shown, the connecting structure 1 connects the connecting skeleton 9 and the connecting rib 3, the connecting skeleton 9 is square steel, and the connecting rib 3 is a C-shaped groove, so the simplified simulation mechanism 7 includes a square structure 71 connected to the transverse part of the bottom of the first gasket 61 or the second gasket 62 respectively, and each square structure is provided with a square through hole to simulate the square steel. The simplified simulation mechanism 7 simulates the connection of the two square structures 71, thereby forming three square structures 71 arranged in the horizontal direction. By setting the C-shaped gasket 6 and the simplified simulation mechanism 7, the stress condition of the connecting structure of the test device is closer to the actual situation, thereby providing the reliability of the test.

[0053] Furthermore, the simplified simulation mechanism 7 is connected to a hinge assembly 8 at the end away from the C-type gasket 6, and the hinge assembly 8 is hinged to the wind simulation mechanism 4 at the end away from the C-type gasket 6, and the hinge assembly 8 is used to eliminate additional bending moment; optionally, the wind simulation mechanism 4 is an electromagnetic vibration table; optionally, the electromagnetic vibration table is a 5KN electromagnetic vibration table, whose maximum thrust can reach 50KN, and the sinusoidal vibration loading frequency is 5~2000Hz. Under ideal conditions, the simplified simulation mechanism 7 should be located at the center of the wind simulation mechanism 4. If the two are not arranged in the same center, additional bending moment will be generated, affecting the accuracy of the test results; in addition, the vibration table transmits pulsating wind pressure to the connecting structure 1 through the hinge assembly 8, which can effectively avoid the possibility of the torsional moment causing the vibration table to be stuck during the transmission process, causing excessive current and causing the vibration table power amplifier to burn out; the vibration table has a circular shape and is placed horizontally; in actual use, if Figure 3 As shown, the connecting ribs 3 are placed horizontally, the connecting frame 9 is placed vertically, and the wind pressure on the connecting structure 1 is in the horizontal direction. However, if arranged according to the actual usage scenario, the frame 2 is not fixed stably, so the frame 2 is placed horizontally and a horizontal vibration table is selected.

[0054] Furthermore, the hinge assembly 8 includes:

[0055] a first connecting member 81, which is disposed at an end of the wind simulation mechanism 4 near the hinge assembly 8, defining a second space therein and providing a first through hole in communication with the second space, wherein the axis of the first through hole is in a second direction, the second direction being perpendicular to the first direction; optionally, the first connecting member 81 is cylindrical, having a circular first opening at its top, the first opening being in communication with the second space;

[0056] a second connecting member 82 disposed in the second space, and having a second through hole formed therein, the axis of the second through hole being oriented in the second direction; optionally, the second connecting member 82 is cylindrical, with an outer diameter slightly smaller than an inner diameter of the first opening, so that the second connecting member 82 can be inserted into the first connecting member 81;

[0057] A first fixing member 83, the first fixing member 83 passes through the first through hole and the second through hole, fixing the first connecting member 81 and the second connecting member 82; optionally, the first fixing member 83 is a cylindrical pin, and one end of the pin has a protrusion with an outer diameter larger than the outer diameter of the pin, and the protrusion is arranged on the outside of the first connecting member 81, and the protrusion is used to prevent the pin from detaching during the process of the wind simulation mechanism 4 applying force to the connecting structure 1.

[0058] Furthermore, the gravity simulation mechanism 5 includes a first bracket 51 provided on the bearing base 21, the extension direction of the first bracket 51 is the first direction, and the top of the first bracket 51 away from the bearing base 21 is provided with two first clamping members 52 along the third direction, and the third direction is perpendicular to the second direction and the first direction; a first rotating member 53 is provided between the two first clamping members 52, and both ends of the first rotating member 53 are rotatably connected to the first clamping members 52, and the axial direction of the first rotating member 53 is the third direction, and the first rotating member 53 is provided with a connecting rope on the side away from the bearing base 21, one end of the connecting rope is connected to the simplified simulation mechanism 7, and the other end is connected to the weight, and the weight is provided outside the first space 22; specifically, as Figure 3 As shown, since in actual use, the connecting rib 3 is set horizontally and the connecting frame 9 is placed vertically, the connecting structure 1 will be subjected to the gravity load from the connecting frame 9 and itself. Therefore, when the frame 2 is placed horizontally, the weight is used to apply a force to the connecting structure 1 to simulate the gravity load in actual use; the connecting rope passes through the two square structures 71 on the edge of the simplified simulation mechanism 7 away from the weight side and is fixed, and the first rotating part 53 and the connecting rope form a movable pulley. In some specific scenarios, the weight is a Φ150mm×220mm steel column (corresponding to 31.5kg deadweight).

[0059] Example 2

[0060] This application provides a test method for the above-mentioned connection structure durability test device, such as Figure 3 As shown, the following steps are included:

[0061] S100, setting a preset life span;

[0062] S200. Construct a life duration conversion model, which is used to eliminate fatigue damage of metal structures. The life test of the connection structure 1 is a typical metal structure fatigue damage problem, and its life distribution satisfies the Weibull distribution. That is, the damage life duration conversion model is a damage Weibull distribution model. The damage life duration conversion model is shown in the following formula:

[0063]

[0064] Among them, T Ris the first life span, T0 is the preset life span, r is the confidence level, R(T0) is the reliability within the preset life span T0, m is the shape parameter of the Weibull distribution, and n is the test sample size; in certain specific scenarios, T0 = 34500 hours, r is 0.7, R(T0) is 0.9; m is conservatively estimated to be 1.5;

[0065] S300, inputting the preset life span into the life span conversion model to obtain a first life span; the first life span under different test sample sizes is shown in Table 1:

[0066] Table 1

[0067]

[0068] Combined with the requirements of GB 2689.1 "General principles for constant stress life test and accelerated life test methods", the preferred sample size n is 2, and according to Table 1, the first life time is T R is 110262;

[0069] S400: Construct a frequency acceleration model. The frequency acceleration model is used to accelerate the test process with frequency. Since the service life of the connection structure 1 is long, the test time needs to be accelerated. Optionally, there are two acceleration methods for the vibration fatigue test: frequency acceleration and amplitude enhancement. To improve the acceleration effect, a combination of frequency acceleration and amplitude enhancement is adopted. The frequency acceleration model is shown in the following formula:

[0070]

[0071] Among them, T f is the second lifespan, w R is the dynamic response frequency before acceleration, w f Frequency after acceleration: A large amount of engineering research and data show that when the test temperature is less than 50°C and the test frequency and operating frequency are both in the range of 5 to 300 Hz, changes in the test frequency within this range have no effect on the fatigue limit of most metals (except fusible alloys and other low-melting-point metals). Therefore, the evolution of fatigue damage can be accelerated by increasing the test frequency, thereby shortening the test time.

[0072] S500, inputting the first life span into the frequency acceleration model to obtain a second life span; optionally, w R is 48.5Hz, w f For 300Hz, set T R =110262Substitute into formula (2) to get T f =17813 hours;

[0073] S600: Construct an amplitude acceleration model, which is used to accelerate the test process by amplitude intensification. Amplitude intensification shortens the test time by increasing the test load level, and reflects the quantitative relationship between the test duration at the accelerated load level and the test duration at the normal load level by determining an acceleration factor. The amplitude acceleration model is shown in the following formula:

[0074]

[0075] Among them, T S is the third life span, and A is the test acceleration factor. According to GB / T 34986-2017 "Product Accelerated Test Methods", when the test acceleration stress is mechanical stress, the inverse power law model should be used to describe the relationship between life and test load magnitude. The characteristic of this model is that the life decreases with the increase of the p-th power of the applied load magnitude, and the expression is:

[0076]

[0077] Among them, ε S is the accelerated load, C and p are unknown coefficients, and the life span under normal load, i.e. the second life span, is as follows:

[0078]

[0079] Among them, ε f is the load in the actual operation process;

[0080] Test acceleration factor:

[0081]

[0082] The load level after acceleration is:

[0083]

[0084] That is, the stress amplitude applied in the actual test is the stress amplitude before acceleration. times; the requirement for the acceleration factor value is that the failure mode of the structure is not changed, that is, the load after acceleration ε S The strain corresponding to the yield strength of the material shall not be exceeded. According to Appendix B of GJB150.16A-2009 "Military Equipment Laboratory Environmental Test Methods Part 16: Vibration Test", the undetermined coefficient p is conservatively set at 6. Considering the feasibility of the project and the actual wind load conditions of the three-type heat exchanger, the acceleration factor A = 130 is adopted, so that the accelerated test magnitude reaches 2.25 times that of the unaccelerated test magnitude.

[0085] S700, input the second life span into the amplitude acceleration model to obtain a third life span; f=17813 and A=130 are input into formula (3) to obtain T S =137 hours, that is, the preset life span after test acceleration is 137 hours

[0086] S800, assembling the test device; installing the connection structure 1, the C-shaped gasket 6, the simplified simulation mechanism 7, the weight, and the vibration table, and setting the weight of the weight to 63 kg and the vibration frequency of the vibration table to 300 Hz;

[0087] S900, starting the wind simulation mechanism 4, and operating the wind simulation mechanism 4 for the third life span; starting the vibration table and operating it for 137 hours;

[0088] S110. When the third life span is reached, observe the state of the connecting structure 1. If the connecting structure 1 is not damaged, it means that the life of the connecting structure 1 can be the preset life span. Optionally, observe the connecting bolts for damage through X-ray. If not, it means that the life of the connecting bolts can reach the preset life span, i.e., 34,500 hours. If the connecting bolts are damaged during the test, it means that the connecting bolts cannot reach the set life span.

[0089] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can also make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A connection structure durability test device, wherein the connection structure (1) is used to connect a skeleton (9) and a connection rib (3), characterized in that: include: A frame (2), wherein the bottom of the frame (2) has a bearing base (21), the top of the frame (2) is provided with the connecting rib (3), and a first space (22) is formed between the bearing base (21) and the connecting rib (3); the connecting structure (1) is provided through the connecting rib (3), and the extending direction of the connecting structure (1) is a first direction; a wind simulation mechanism (4), the wind simulation mechanism (4) being disposed in the first space (22) and connected to the connection structure (1), the wind simulation mechanism (4) being capable of providing pulsating wind pressure to the connection structure (1); A gravity simulation mechanism (5), the gravity simulation mechanism (5) being arranged on the bearing base (21), one end of which is connected to the connection structure (1), and the gravity simulation mechanism (5) being used to simulate a constant uniformly distributed load of gravity borne in actual applications; A control mechanism, the control mechanism being electrically connected to the wind simulation mechanism (4), the control mechanism being used to drive the wind simulation mechanism (4) to operate and record the test time; A C-shaped gasket (6) connected to the connecting structure (1) in the first space (22), the end of the C-shaped gasket (6) away from the connecting structure (1) is connected to a simplified simulation mechanism (7), and the end of the simplified simulation mechanism (7) away from the C-shaped gasket (6) is connected to the wind simulation mechanism (4); the simplified simulation mechanism (7) is used to simulate the connecting skeleton (9); The simplified simulation mechanism (7) is connected to a hinge assembly (8) at the end away from the C-shaped gasket (6), and the hinge assembly (8) is hinged to the wind simulation mechanism (4) at the end away from the C-shaped gasket (6), and the hinge assembly (8) is used to eliminate additional bending moment; The hinge assembly (8) comprises: a first connecting member (81), the first connecting member (81) being arranged at an end of the wind force simulation mechanism (4) close to the hinge assembly (8), the first connecting member (81) having a second space therein, and the first connecting member (81) being provided with a first through hole communicating with the second space, the axis direction of the first through hole being a second direction, and the second direction being perpendicular to the first direction; a second connecting member (82), the second connecting member (82) being disposed in the second space, the second connecting member (82) being provided with a second through hole, the axial direction of the second through hole being the second direction; a first fixing member (83), the first fixing member (83) passing through the first through hole and the second through hole to fix the first connecting member (81) and the second connecting member (82); The gravity simulation mechanism (5) includes a first bracket (51) arranged on the bearing base (21), the extension direction of the first bracket (51) is the first direction, and the first bracket (51) is provided with two first clamping members (52) along a third direction away from the top of the bearing base (21), and the third direction is perpendicular to the second direction and the first direction; a first rotating member (53) is provided between the two first clamping members (52), and the two ends of the first rotating member (53) are rotatably connected to the first clamping member (52), the axial direction of the first rotating member (53) is the third direction, and the first rotating member (53) is provided with a connecting rope on the side away from the bearing base (21), one end of the connecting rope is connected to the simplified simulation mechanism (7), and the other end is connected to a weight, and the weight is arranged outside the first space.

2. The connection structure durability testing device according to claim 1, characterized in that: The wind force simulation mechanism (4) is an electromagnetic vibration table.

3. A test method for the connection structure durability test device according to any one of claims 1 to 2, characterized in that: The steps include: Set the preset lifespan; Constructing a lifespan conversion model, wherein the lifespan conversion model is used to eliminate fatigue damage of metal structures; Inputting the preset life span into the life span conversion model to obtain a first life span; Constructing a frequency acceleration model, wherein the frequency acceleration model is used to accelerate the test process with frequency; Inputting the first life span into the frequency acceleration model to obtain a second life span; Constructing an amplitude acceleration model, wherein the amplitude acceleration model is used to accelerate the test process by amplitude intensification; Inputting the second life span into the amplitude acceleration model to obtain a third life span; Assembling the test device; Starting the wind simulation mechanism (4), wherein the wind simulation mechanism (4) operates for a duration equal to the third lifespan; When the third life span is reached, the state of the connection structure (1) is observed. If the connection structure (1) is not damaged, it means that the life span of the connection structure (1) can be the preset life span.

4. The test method of the connection structure durability test device according to claim 3, characterized in that: The life span conversion model is shown in the following formula: Among them, T R is the first life span, T0 is the preset life span, r is the confidence level, R(T0) is the reliability within the preset life span T0, m is the shape parameter of the Weibull distribution, and n is the test sample size.

5. The test method of the connection structure durability test device according to claim 3, characterized in that: The frequency acceleration model is shown below: Among them, T f is the second lifespan, w R is the dynamic response frequency before acceleration, w f Frequency after acceleration.

6. The test method of the connection structure durability test device according to claim 3, characterized in that: The amplitude acceleration model is shown as follows: Among them, T S is the third life span, and A is the test acceleration factor.

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