Device and method for eccentric compression test of FRP rib concrete column

Abstract

The invention relates to the field of concrete testing, in particular to an eccentric compression test device and method for an FRP rib concrete column. Comprising a control system and a spring integration device, the spring integration device comprises a cover plate, a force sensor and a plurality of spring devices, the spring devices are detachably connected with the cover plate, the plurality of spring devices are arranged in an array, and the control system can perform pressure distribution adjustment on each spring device to realize an eccentric loading test on the FRP reinforced concrete column. The spring integrated device disclosed by the invention can convert the axial compression effect of a conventional axial press actuator into any required eccentric loading mode, so that the implementation of a complex eccentric loading working condition is ensured, the safety of an eccentric loading test is greatly enhanced, and the stability of the eccentric loading test is improved by accurately adjusting the rigidity in the spring device. And fine adjustment of eccentric force can be realized, so that the test precision under various complex eccentric loading test working conditions is improved.

Description

Technical Field

[0001] The present invention relates to the field of concrete testing, and particularly to an eccentric compression test device and method for FRP-reinforced concrete columns. Background Art

[0002] The existing technology applies FRP (Fiber Reinforced Polymer) bars to concrete structures, which can solve the durability problems caused by steel bar corrosion in traditional reinforced concrete structures; due to its excellent corrosion resistance, light weight, high strength, and easy processing and forming characteristics, FRP bars have been widely recognized and practically applied in many fields such as bridge engineering, building structures, and offshore platforms.

[0003] However, in practical engineering applications, since structures often face complex and variable load conditions, among which eccentric compression is a common and critical load form, it poses challenges to the safety performance, stability, and bearing capacity of the structure. Eccentric compression not only causes uneven internal force distribution in the structure but may also lead to local stress concentration, thereby accelerating the damage and failure of the structure. Therefore, exploring the mechanical properties of FRP-reinforced concrete columns under eccentric compression is crucial for evaluating their safety performance in practical engineering.

[0004] Although there are currently some test devices for testing the eccentric compression performance of FRP-reinforced concrete columns, most of the devices have complex structures, difficult operation, and potential safety hazards. The devices are often difficult to comprehensively and accurately simulate the complex and variable eccentric loading conditions in practical engineering, and at the same time, they cannot accurately control the loading and eccentricity, resulting in significant deviations between the test results and the actual engineering situation; in addition, considering the brittle failure characteristics of FRP bars, directly using traditional eccentric compression test devices for FRP-reinforced concrete columns not only fails to meet the accuracy requirements but also poses greater risks in terms of safety. Summary of the Invention

[0005] In view of the problems mentioned in the existing technology, the present invention proposes an eccentric compression test device and method for FRP-reinforced concrete columns. The test device of the present invention not only has a simple structure but also can accurately realize the eccentric loading test of FRP-reinforced concrete columns, obtain the compression performance of FRP-reinforced concrete components under different eccentric loading conditions, the test results can meet the requirements in terms of accuracy, and at the same time, the safety can be guaranteed.

[0006] To achieve the above object, the present invention adopts the following technical solutions: An apparatus for eccentric compression test of FRP-reinforced concrete columns according to the present invention includes a control system and a spring integration device connected to each other. The spring integration device includes a cover plate, a force sensor, and a spring device. The spring device, the force sensor, and the cover plate are detachably connected. A plurality of spring devices are arranged in an array. The control system can adjust the pressure distribution of each spring device respectively to perform an eccentric loading test on the FRP-reinforced concrete column.

[0007] As a further improvement of the present invention, the spring device includes a top plate, a base, a spring bundle, and a fixing spring. The top and bottom ends of the fixing spring are fixedly connected to the top plate and the base respectively. One end of the spring bundle is provided with a pulley, and the pulley is tightly connected to the top plate. The other end is hinged to the base.

[0008] As a further improvement of the present invention, the two ends of the fixing spring are respectively connected to the centers of the top plate and the base, and a plurality of spring bundles are sequentially arranged at intervals on a circle centered on the center of the fixing spring.

[0009] As a further improvement of the present invention, the top plate is provided with a plurality of sliding rails extending inward from the edge, and the pulley passes through the sliding rails and is tightly connected to the top plate.

[0010] As a further improvement of the present invention, a telescopic rod control device is further provided in the middle of the top plate. The telescopic rod control device is connected to the fixing spring. The telescopic rod control device is connected to a plurality of telescopic rods, and the other end of the telescopic rod is connected to a push plate. The telescopic rods and the push plate can push the spring bundle out of the sliding rails in the top plate.

[0011] As a further improvement of the present invention, a plurality of channels are provided at intervals on the telescopic rod control device, and baffles are provided in the channels; One end of the baffle is in contact connection with a slider, the slider is connected to an elastic member, and a control button is provided at the other end of the baffle. The control button is connected to the telescopic rod.

[0012] As a further improvement of the present invention, the telescopic rod can also be a rigid rod.

[0013] As a further improvement of the present invention, a plurality of grooves are provided in the cover plate, and threads are provided in the grooves for connecting the spring device.

[0014] A method for an apparatus for eccentric compression test of FRP-reinforced concrete columns includes the following steps: During the test, the spring body integrated device is installed on the upper surface of the FRP bar reinforced concrete column. The actuator of a conventional pressure testing machine is used to push the upper platen of the testing machine to apply pressure to the spring integrated device. The pressure of each spring device in the spring integrated device is adjusted through the control system to achieve an uneven eccentric pressure field. Each adjusted spring device will feedback the real-time stress state to the control system, and the system will then calculate the pressure that each spring device needs to reach in the next loading step, and then adjust the stiffness of the spring device, and so on in a cycle until the specimen fails.

[0015] As a further improvement of the present invention, the control system calculates the eccentric stress condition of the structure according to the loading condition, and adjusts the number of spring bundles for stress in each spring device according to the eccentric stress condition. The control system transmits the signal at the corresponding position to the telescopic rod control device. Under the action of the telescopic rod control device, the spring bundles are symmetrically pushed out of the top plate range in pairs through the telescopic rod, so that the spring bundles are withdrawn from the stress, and then the pressure of the spring device is adjusted, and the stability of the spring device during the withdrawal process is ensured.

[0016] The present invention has achieved the following technical effects compared with the prior art: The spring integrated device of the present invention can convert the axial uniform compression action of the existing conventional pressure testing machine into any required eccentric pressure distribution mode, which not only ensures the accuracy of the loading method, but also greatly improves the safety of the test. By precisely adjusting the stiffness of the spring device, fine adjustment of the eccentric force can be achieved, so as to meet the requirements of various complex eccentric loading test conditions.

[0017] The present invention is also provided with a spring device. The spring device pushes out the spring bundles through the telescopic rod, so that the corresponding spring bundles are withdrawn from the bearing work, and then the pressure difference of different spring devices and eccentric loading are realized, which can meet the accurate adjustment of eccentric loading under various complex test conditions.

[0018] During the displacement control loading process, the control system in the present invention calculates the stress condition of the structure in real time, and according to the previous test condition and feedback information, accurately calculates the pressure that each spring device should transmit and the pushing-out state of the spring bundles in each spring device, and transmits the calculated signal to each spring device. The spring device symmetrically withdraws a certain number of spring bundles in pairs from the top plate range through two methods according to the received signal to achieve the preset loading state; at the same time, each spring device feeds back the axial stiffness of the concrete to the control system through the force sensor connected thereto. In the next loading step, the control system further calculates and adjusts the lateral restraint structure and stress state of the spring bundles that each spring device needs to push out according to the feedback stiffness information of each spring device, so as to form a closed-loop control system, which ensures the accuracy and stability during the test process. Until the specimen fails, data such as the ultimate bearing capacity of the structure can be obtained, providing a basis for subsequent evaluation. Description of the Drawings Figure 1 Schematic diagram of the spring device structure of the present invention; Figure 2 Top view of the spring device structure of the present invention; Figure 3 Schematic diagram of the usage state of the spring device structure of the present invention; Figure 4 Top view of the usage state of the spring device structure of the present invention; Figure 5 Schematic diagram of the spring integrated device of the present invention; Figure 6 Schematic diagram of another angle of the spring integrated device of the present invention; Figure 7 Schematic diagram of the telescopic rod control device structure of the present invention; Figure 8 Schematic diagram of the test of the present invention; Figure 9 Test diagram of the control system of the present invention; Figure 10 Flow chart of the implementation steps of the method of the present invention.

[0019] Reference numerals: 1. Spring bundle; 2. Telescopic rod control device; 3. Top plate; 4. Telescopic rod; 5. Fixed spring; 6. Base; 7. Hinge support; 8. Slide rail; 9. Push plate; 10. Groove; 11. Cover plate; 12. Thread; 13. Spring integrated device; 14. Channel; 15. Baffle; 16. Elastic member; 17. Control button; 18. Press plate; 19. Press actuator; 20. FRP-reinforced concrete column; 21. Control system; 22. Slide block; 23. Force sensor; 24. Pulley. Detailed implementation manners

[0020] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0023] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0025] It should be understood that when used in this specification and the appended claims, the terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0026] It should also be understood that the terms used in the specification of the present invention are merely for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly dictates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0027] It should be further understood that the term "and / or" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0028] Various structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the accompanying drawings. These figures are not drawn to scale, where for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art can additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0029] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] As Figure 1 、 Figure 2 and Figure 9 shown, a device for eccentric compression test of FRP - reinforced concrete columns according to the present invention includes a connected control system 21 and a spring integration device 13. The spring integration device 13 includes a cover plate 11, a force sensor 23, and a spring device. The spring device, the force sensor 23, and the cover plate 11 are detachably connected. A plurality of spring devices are arranged in an array. The control system 21 can adjust the pressure distribution of each spring device respectively to perform an eccentric loading test on the FRP - reinforced concrete column 20.

[0031] In the embodiment, the spring integration device 13 can integrate a plurality of spring devices into one body. As Figure 5 and Figure 6 shown, a plurality of spring devices are equally spaced on the cover plate 11; as Figure 5 shown, a plurality of grooves 10 are provided in the cover plate 11. The grooves 10 are arranged in sequence at intervals. The size of the spring device matches the size of the groove 10. The spring device can be connected to the cover plate 11 through the groove 10. The bottoms of a plurality of spring devices are placed on the upper surface of the FRP - reinforced concrete column 20 for conducting the test. In the embodiment, threads 12 are provided in the grooves 10. Preferably, the spring device is connected to the cover plate 11 by a threaded connection method. Figure 5 shown, a force sensor 23 is also provided at the bottom of the groove 10. The force sensor 23 in the embodiment can detect the pressure change in real - time and upload the pressure change situation to the control system 21.

[0032] The spring device includes a top plate 3, a base 6, a spring bundle 1, and a fixed spring 5. The top and bottom of the fixed spring 5 are respectively fixedly connected to the top plate 3 and the base 6. One end of the spring bundle 1 is provided with a pulley 24. The pulley 24 is installed on the slide rail 8 in the top plate 3 and is tightly connected to the top plate 3. The other end is hinged to the base 6. The fixed spring 5 is provided at the center of the top plate 3 and the base 6. A plurality of spring bundles 1 are arranged at intervals in a circle centered on the center of the fixed spring 5. As Figure 1 and Figure 2As shown, in the embodiment, the spring device as a whole is cylindrical. A fixed spring 5 is provided in the middle between the top plate 3 and the base 6. The fixed spring 5 is used to provide the minimum resistance for the spring device. A plurality of spring bundles 1 are also provided between the top plate 3 and the base 6. The plurality of spring bundles 1 are arranged around the fixed spring 5. The bottom of the spring bundle 1 is connected to the hinge support 7 in the base 6, so that the spring bundle 1 can move around the hinge support 7.

[0033] As Figure 2 shown, a plurality of slide rails 8 extend radially from the center to the edge of the top plate 3. The pulley 24 is arranged in the slide rail 8. In the embodiment, the number of the slide rails 8 matches the number of the spring bundles 1. The spring bundle 1 is fixedly connected to the pulley 24 and arranged in the slide rail 8. As Figure 3 and Figure 4 shown in the schematic diagram of the device usage, a pulley 24 is provided at the top end of the spring bundle 1. The pulley 24 can slide in the slide rail 8. Under the action of the telescopic rod 4, the push plate 9 can push the spring bundle 1 out of the slide rail 8, so that the spring bundle 1 is pushed out of the range of the top plate 3, and the spring bundle 1 exits the work. In the embodiment, the spring bundles 1 are symmetrically pushed out in pairs.

[0034] A telescopic rod control device 2 is also provided in the middle of the top plate 3. The telescopic rod control device 2 is connected to the fixed spring 5. Among them, the telescopic rod control device 2 is connected to a plurality of telescopic rods 4. The other end of the telescopic rod 4 is connected with a push plate 9. The telescopic rod 4 and the push plate 9 can push the spring bundle 1 out of the top plate 3 along the track 8.

[0035] A plurality of channels 14 are provided at intervals in the telescopic rod control device 2. A movable baffle 15 is provided at the inner end of the channel 14. One end of the baffle 15 is in compression contact with the slider 22. The other end of the slider 22 is connected to the elastic member 16. A control button 17 is provided at the other end of the baffle 15. The control button 17 is connected to the telescopic rod 4. The elastic member 16 is a high-strength spring. As Figure 7 shown, in the embodiment, the telescopic rod control device 2 is used to control the telescopic movement of each telescopic rod 4. The whole control device is arranged in the middle of the top plate 3 and sleeved on the fixed spring 5. The device body is of a ring structure. A plurality of control buttons 17 are annularly distributed along this structure. Each control button 17 is connected to the corresponding telescopic rod 4 to control the telescopic movement of the telescopic rod 4. Among them, the control button 17 is arranged in the channel 14. A baffle 15 is provided on the channel 14 to block the slider 22. The slider 22 is connected to the elastic member 16. In this embodiment, the opening and closing of the baffle 15 are realized by a chain drive structure. Each chain drive mechanism is controlled by a motor to realize the chain movement and then open or close the baffle 15. In the embodiment, the motor preferably adopts the Xiaomi CyberGear micro-motor.

[0036] When the telescopic rod control device 2 is not activated, the channel 14 is closed under the action of the baffle 15 at this time. The slider 22 is in contact connection with the baffle 15, and the elastic member 16 is in a compressed state. After the telescopic rod 4 control device 2 is activated, the channel 14 is opened, and the elastic member 16 pops out to make the slider 22 press the control button 17 to control the telescopic movement of the telescopic rod 4. In this embodiment, the high-strength spring is a spring with high strength and elastic limit, so it is suitable for bearing the load in the structure of the present invention. The high-strength spring is preferably made of high-strength alloy steel or stainless steel and other materials to meet the requirements of the present invention.

[0037] In the embodiment, the telescopic rod 4 can be replaced by a rigid rod. After the control device is activated, the baffle 15 at the end of the channel 14 is opened, and the elastic member 16 pops out to make the slider 22 generate a thrust on the rigid rod 25, and push the spring bundle 1 at the other end of the rigid rod 25 out along the slide rail 8.

[0038] As Figure 8 shown in the schematic diagram, during the installation before the test, the spring integration device 13 is installed on the FRP-reinforced concrete column 20, and the pressure machine actuator 19 is pushed by a jack to pressurize the spring integration device 13. The jack is the preferred pressure application device in the present invention. Of course, other pressure application devices can also be selected according to the actual use scenario. When the jack pushes the pressure machine actuator 19 to pressurize the spring integration device 13, the control system 21 will control and adjust the force on each spring bundle 1 in each spring device in the spring integration device in real time, so that the entire loading process meets the preset eccentric pressure distribution condition, and then realizes the eccentric loading of the FRP-reinforced concrete column 20.

[0039] As Figure 10 shown, the principle of the control system 21 in this embodiment is as follows: First, set the eccentricity in the initial system, calculate the compressive stress distribution condition according to the eccentricity, divide the surface of the specimen into checkerboard-like grid areas and number them in sequence in the calculation module. The area of each grid area is , and the grid area where the maximum compressive stress position is located is numbered 0. The device takes the spring device stiffness in the 0th grid area as the reference, calculates the corresponding spring device stiffness values of other grid areas according to the calculated eccentric pressure distribution, and transmits the calculated spring stiffness value information to the spring devices in the corresponding grid areas. The spring devices are activated, and part of the spring bundles 1 are withdrawn from the force, so as to form an eccentric compression condition under the axial compression of the pressure machine actuator 19, and the real-time force states of the adjusted springs are fed back to the control system 21.

[0040] As Figure 9As shown in the figure, the test process of the present invention is as follows: The control system 21 calculates the eccentric stress condition of the structure according to the loading condition, calculates the number of spring bundles 1 for stress in each spring device according to the eccentric stress condition, determines the position of the spring bundle 1 to be withdrawn from stress, and the control system 21 transmits the spring bundle adjustment signal corresponding to the spring position to the telescopic rod control device 2. Under the action of the telescopic rod control device 2, the spring bundle 1 is symmetrically pushed out of the range of the top plate 3 through the telescopic rod 4, so that the spring bundle 1 is withdrawn from stress, thereby realizing the adjustment of the pressure of the spring device, for further adjusting the stiffness of the spring device. The real-time stress state of each adjusted spring is fed back to the control system 21, and this cycle continues until the specimen fails.

[0041] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be construed as limiting the claimed invention.

[0042] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A device for eccentric compression test of FRP reinforced concrete columns, characterized in that: The invention comprises a control system (21) and a spring integrated device (13) connected to each other. The spring integrated device (13) comprises a cover plate (11), a force sensor (23) and a spring device. The spring device, the force sensor (23) and the cover plate (11) are detachably connected. A plurality of spring devices are arranged in an array. The control system (21) can adjust the pressure distribution of each spring device respectively, so as to realize an eccentric loading test on an FRP reinforced concrete column (20).

2. The device for eccentric compression test of FRP reinforced concrete columns according to claim 1, characterized in that: The spring device comprises a top plate (3), a base (6), a spring bundle (1) and a fixed spring (5); the top and bottom ends of the fixed spring (5) are respectively fixedly connected to the top plate (3) and the base (6); one end of the spring bundle (1) is provided with a pulley (24); the pulley (24) is tightly connected to the top plate (3) and the other end is hingedly connected to the base (6).

3. The device for eccentric compression test of FRP reinforced concrete columns according to claim 2, characterized in that: The two ends of the fixed spring (5) are respectively connected to the center of the top plate (3) and the base (6), and a plurality of spring bundles (1) are sequentially arranged at intervals on a circle with the center of the fixed spring (5) as the center.

4. The device for eccentric compression test of FRP reinforced concrete columns according to claim 2, characterized in that: The top plate (3) is provided with a plurality of slide rails (8) extending inward from the edge, and the pulley (24) passes through the slide rails (8) and is tightly connected to the top plate (3).

5. The device for eccentric compression test of FRP reinforced concrete column (20) according to claim 2, characterized in that: A telescopic rod control device (2) is also provided in the middle of the top plate (3), and the telescopic rod control device (2) is connected to the top of the fixed spring (5), wherein the telescopic rod control device (2) is connected to a plurality of telescopic rods (4), and the other end of the telescopic rod (4) is connected to a push plate (9), and the telescopic rod (4) and the push plate (9) can push the spring bundle (1) out of the slide rail (8) in the top plate (3).

6. The device for eccentric compression test of FRP reinforced concrete column (20) according to claim 5, characterized in that: The telescopic rod control device (2) is provided with a plurality of channels (14) at intervals, and a baffle (15) is provided in the channel (14); One end of the baffle (15) is in contact with and connected to the slider (22), the slider (22) is connected to the elastic member (16), and the other end of the baffle (15) is provided with a control button (17), which is connected to the telescopic rod (4).

7. The device for eccentric compression test of FRP reinforced concrete column (20) according to claim 5, characterized in that: The telescopic rod (4) may also be a rigid rod.

8. The device for eccentric compression test of FRP reinforced concrete column (20) according to claim 1, characterized in that: A plurality of grooves (10) are arranged in the cover plate (11), and threads (12) are provided in the grooves (10) for connecting the spring device.

9. A method for testing eccentric compression of FRP reinforced concrete columns, characterized in that: The following steps are involved: During the test, the spring body integrated device is installed on the upper surface of the FRP reinforced concrete column. The actuator of the conventional pressure testing machine pushes the upper pressure plate of the testing machine to pressurize the spring integrated device. The pressure of each spring device in the spring body integrated device is adjusted by the control system to achieve an uneven eccentric pressure field. The adjusted spring devices will feed back the real-time force state to the control system. The system then calculates the pressure that each spring device needs to reach in the next loading step, and then adjusts the stiffness of the spring device. This cycle is repeated until the specimen is destroyed.

10. A method for testing an eccentric compression device for FRP reinforced concrete columns according to claim 9, characterized in that: The control system calculates the eccentric stress condition of the structure according to the loading condition, and adjusts the number of spring bundles used for stress in each spring device according to the eccentric stress condition. The control system transmits the signal of the corresponding position to the telescopic rod control device. Under the action of the telescopic rod control device, the spring bundles are pushed out of the top plate range in pairs symmetrically through the telescopic rod, so that the spring bundles are withdrawn from the stress, thereby realizing the adjustment of the pressure of the spring device and ensuring the stability of the spring device during the withdrawal process.

Images