Graded multi-state double-control energy consumption node reinforcing device based on rubber, SMA and MRE and reinforcing method of graded multi-state double-control energy consumption node reinforcing device

Abstract

The invention provides a graded multi-state double-control energy consumption node reinforcing device based on rubber, SMA and MRE and a reinforcing method thereof, and belongs to the technical field of building structure repairing and reinforcing technology.The graded multi-state double-control energy consumption node reinforcing device comprises a reinforcing assembly arranged at the junction of a beam column, the reinforcing assembly comprises a column end fixing plate and a beam end fixing plate, the column end fixing plate is fixed to the vertical end of the beam column, and the beam end fixing plate is fixed to the vertical end of the beam column; the beam end fixing plate is fixed at the horizontal end of the beam column; an SMA rod is arranged between the column end fixing plate and the beam end fixing plate, a first-stage energy dissipation assembly is arranged on the SMA rod, a second-stage energy dissipation assembly is arranged on the beam end fixing plate, one end of the SMA rod is connected with the column end fixing plate, and the other end of the SMA rod is connected with the second-stage energy dissipation assembly. As the device enters an active control stage, a new active energy consumption component is added while a passive energy consumption mode is reserved.

Description

Technical Field

[0001] The present invention belongs to the technical field of building structure repair and reinforcement, and specifically relates to a hierarchical multi-state dual-control energy-consuming node reinforcement device based on rubber, SMA and MRE, and a reinforcement method thereof. Background Art

[0002] Beam-column joints in concrete frame structures are critical for transmitting bending moments and shear forces, and their seismic performance directly impacts the overall structural stability. While traditional reinforcement methods (such as steel plate wrapping and carbon fiber fabric) can improve joint stiffness, they suffer from the following issues: insufficient energy dissipation capacity: Rigid reinforcement can easily lead to brittle failure of the joints, making it difficult to dissipate energy through plastic deformation; and limited adaptability: the inability to set up a multi-level energy dissipation mechanism based on load magnitude. Consequently, energy dissipation capacity is insufficient when the load is too high, and excessive when the load is too low.

[0003] In the existing technology, magnetorheological materials and shape memory alloys (SMA) have been used for structural energy dissipation, but they are mostly limited to a single energy dissipation mode and it is difficult to take into account the performance requirements of different deformation stages.

[0004] To this end, the present invention proposes a hierarchical multi-state dual-control energy-consuming node reinforcement device and a reinforcement method based on rubber, SMA and MRE to solve the above problems. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides a hierarchical multi-state dual-control energy dissipation node reinforcement device based on rubber, SMA and MRE, comprising a reinforcement assembly arranged at the junction of a beam and a column, the reinforcement assembly comprising a column end fixing plate and a beam end fixing plate, the column end fixing plate being fixed to the vertical end of the beam and the column, and the beam end fixing plate being fixed to the horizontal end of the beam and the column;

[0006] An SMA rod is provided between the column end fixing plate and the beam end fixing plate, a primary energy dissipation component is provided on the SMA rod, and a secondary energy dissipation component is provided on the beam end fixing plate. One end of the SMA rod is connected to the column end fixing plate, and the other end of the SMA rod is connected to the secondary energy dissipation component.

[0007] Furthermore, the primary energy dissipation component includes a rubber cushion metal sleeve, the rubber cushion metal sleeve is sleeved on the SMA rod, and the rubber cushion metal sleeve is fixed on the beam end fixing plate;

[0008] The portion of the SMA rod located in the rubber pad metal sleeve is fixedly connected to a connecting rod. A plurality of rubber friction pads are provided in the rubber pad metal sleeve. The plurality of rubber friction pads are distributed on both sides of the connecting rod. The rubber friction pads are sleeved on the SMA rod.

[0009] Furthermore, the SMA rod is composed of a first metal rod arranged obliquely with the left side higher and the right side lower, and a second metal rod arranged horizontally;

[0010] The left end of the first metal rod is fixedly connected to the column end fixing plate, the right end of the first metal rod is fixedly connected to the left end of the second metal rod, and the right end of the second metal rod is connected to the secondary energy dissipation component;

[0011] The right end of the first metal rod and the left end of the second metal rod are both located in the rubber pad metal sleeve, the connecting rod is inserted through the first metal rod, the connecting rod and the first metal rod are arranged perpendicular to each other, and several rubber friction pads are all sleeved on the first metal rod.

[0012] Furthermore, a rubber anti-skid plate is provided in the metal sleeve of the rubber pad layer, the rubber anti-skid plate is located at the bottom of the plurality of rubber friction pad layers, and the rubber anti-skid plate is sleeved on the right end of the first metal rod.

[0013] Furthermore, the length of the first metal rod is 500 mm, and the length of the second metal rod is 150 mm;

[0014] The rubber pad metal sleeve is a hollow cylindrical sleeve, and the rubber friction pad is in the shape of a ring.

[0015] Furthermore, the secondary energy dissipation component includes an MRE container, which is located on the right side of the rubber cushion metal sleeve and the two are fixedly connected. The MRE container is provided with an MRE energy dissipation module. The right side of the MRE container is fixedly connected to a single-chip microcomputer, which is fixed to the beam end fixing plate.

[0016] It also includes a displacement sensor fixedly installed at the junction of the beam and column, and the displacement sensor and the MRE energy consumption module are both electrically connected to the single chip microcomputer;

[0017] The right end of the second metal rod horizontally passes through the rubber cushion metal sleeve and is inserted into the MRE container, and the right end of the second metal rod is connected to the MRE energy consumption module.

[0018] Furthermore, the MRE energy consumption module is filled with MRE material, and an electromagnetic coil is provided in the MRE energy consumption module. A current controller is provided inside the electromagnetic coil, and both the electromagnetic coil and the current controller are electrically connected to the single chip microcomputer.

[0019] Furthermore, a sliding support bearing is horizontally provided in the rubber cushion metal sleeve at the bottom of the second metal rod.

[0020] A hierarchical multi-state dual-control energy-consuming node reinforcement method based on rubber, SMA and MRE includes the following steps:

[0021] S1: First, prepare an SMA rod with a length of about 650 mm. The SMA rod consists of a first metal rod and a second metal rod. The first metal rod is set at an angle and has a length of 500 mm. The second metal rod is set horizontally and has a length of 150 mm.

[0022] S2: Install the column end fixing plate and the beam end fixing plate on the beam column, tighten the bolts on the column end fixing plate and the beam end fixing plate to the designed preload, then fix the left end of the first metal rod in the SMA rod to the column end fixing plate, then insert the rubber pad metal sleeve and embed the rubber friction pad so that the SMA rod as a whole passes through the rubber pad metal sleeve and points to the beam end fixing plate;

[0023] S3: The rubber pad metal sleeve is then welded and fixed to the beam end fixing plate, and a circular rubber friction pad is placed. The rubber friction pads are distributed on both sides of the connecting rod, one side is set on the upper left side of the connecting rod, and the other side is set on the lower right side of the connecting rod;

[0024] S4: Then weld the MRE container to the beam end fixing plate, and then install the MRE energy consumption module. Weld the MRE container on the beam end fixing plate, and place the MRE energy consumption module and the single-chip microcomputer. Connect the power line of the electromagnetic coil and the displacement sensor to the single-chip microcomputer. Connect the MRE energy consumption module and the current controller to the single-chip microcomputer, build the circuit and debug the trigger threshold. Then set the displacement sensor at the junction of the beam and column to detect the piezoelectric effect or the relative displacement of the beam-column node. Among them, a support bearing with sliding contact surface is configured at the bottom of the second metal rod to ensure that the SMA rod acts on the MRE energy consumption module when strain occurs.

[0025] The advantages of this invention are that the reinforcement device can dissipate seismic or wind-induced vibration energy through damping while improving the bending bearing capacity and stiffness of the beam-column joint. Furthermore, the design concept of graded energy dissipation avoids excessive energy consumption during minor earthquakes and insufficient energy dissipation during major earthquakes. Furthermore, the second-level energy dissipation is actively controlled. By setting corresponding thresholds, without human intervention, the device can sense the relative displacement at the beam-column junction or the piezoelectric effect of the magnetorheological elastomer to increase the magnetic field strength of the MRE module, thereby continuously improving the device's shock absorption capacity in high-intensity areas.

[0026] The magnetorheological elastomer (MRE) of the present invention has significant advantages in building shock absorption. Its stiffness and damping can be adjusted in real time through an external magnetic field, and it can dynamically optimize the structural dynamic response during an earthquake. Compared with traditional shock absorption devices, MRE does not require a complex mechanical structure, has no moving parts to wear, is highly reliable and has low maintenance costs; it also has wide-band adaptability, taking into account both low-frequency large-scale shaking and high-frequency aftershock control. In addition, MRE has strong weather resistance and can operate stably for a long time in extreme temperature or corrosive environments, providing buildings with an efficient and adaptive active shock absorption solution.

[0027] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional diagram of the reinforcement device of the present invention.

[0029] Figure 2 It is a front view of the reinforcement device of the present invention.

[0030] Figure 3 It is a front view of the rubber cushion metal sleeve of the present invention.

[0031] Figure 4 It is a top view of the rubber cushion metal sleeve of the present invention.

[0032] Figure 5 Schematic diagram of the structure of the SMA rod of the present invention.

[0033] Figure 6 It is a structural schematic diagram of the column end fixing plate of the present invention.

[0034] Figure 7 It is a structural schematic diagram of the beam end fixing plate of the present invention.

[0035] Figure 8 Schematic diagram of the MRE module structure of the present invention.

[0036] Figure 9 It is a partial cross-sectional view of the rubber cushion metal sleeve of the present invention.

[0037] Figure 10 It is a cross-sectional view of the rubber cushion metal sleeve structure of the present invention.

[0038] Explanation of the accompanying drawings: 1. Reinforcement assembly; 11. Column end fixing plate; 12. Beam end fixing plate; 13. SMA rod; 131. First metal rod; 132. Second metal rod; 2. Primary energy dissipation assembly; 21. Rubber cushion metal sleeve; 22. Connecting rod; 23. Rubber friction cushion; 24. Rubber anti-skid plate; 3. Secondary energy dissipation assembly; 31. MRE container; 32. MRE energy dissipation module; 321. Electromagnetic coil; 322. Current controller; 33. Single-chip microcomputer; 34. Displacement sensor; 35. Support bearing. DETAILED DESCRIPTION

[0039] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose, the specific implementation methods, structural features and effects of the present invention are described in detail below with reference to the accompanying drawings and examples.

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "aligned", "overlap", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying 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 cannot be understood as limiting the present invention.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features; and in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0043] Example 1

[0044] This embodiment provides Figures 1 to 10 The illustrated device is a hierarchical, multi-state, dual-control energy dissipation node reinforcement device based on rubber, SMA, and MRE, comprising a reinforcement assembly 1 disposed at the junction of a beam and a column. The reinforcement assembly 1 comprises a column-end fixing plate 11 and a beam-end fixing plate 12. The column-end fixing plate 11 is fixed to the vertical end of the beam and the column, and the beam-end fixing plate 12 is fixed to the horizontal end of the beam and the column.

[0045] An SMA rod 13 is provided between the column end fixing plate 11 and the beam end fixing plate 12. A primary energy dissipation component 2 is provided on the SMA rod 13, and a secondary energy dissipation component 3 is provided on the beam end fixing plate 12. One end of the SMA rod 13 is connected to the column end fixing plate 11, and the other end of the SMA rod 13 is connected to the secondary energy dissipation component 3.

[0046] The first-level energy dissipation component 2 includes a rubber cushion metal sleeve 21, which is sleeved on the SMA rod 13 and fixed on the beam end fixing plate 12;

[0047] The part of the SMA rod 13 located in the rubber cushion metal sleeve 21 is fixedly connected to the connecting rod 22, which is a rectangular SMA rod. A plurality of rubber friction pads 23 are provided in the rubber cushion metal sleeve 21, and the plurality of rubber friction pads 23 are distributed on both sides of the connecting rod 22. The rubber friction pads 23 are sleeved on the SMA rod 13, and one side of the beam end of the rubber cushion metal sleeve 21 should be welded with an opening plate that can only pass through the SMA rod 13 to limit the slippage of the rubber friction pad 23. The SMA rod 13 is connected to the fixed plate on the beam column through this rubber cushion metal sleeve 21, wherein the SMA rod 13 is a shape memory SMA rod 13, which consists of a first metal rod 131 tilted on the left and low on the right, and a second metal rod 132 set horizontally. The length of the first metal rod 131 is 500 mm, and the length of the second metal rod 132 is 150 mm.

[0048] The left end of the first metal rod 131 is fixedly connected to the column end fixing plate 11 by bolts, the right end of the first metal rod 131 is fixedly connected to the left end of the second metal rod 132, and the right end of the second metal rod 132 is connected to the secondary energy dissipation component 3;

[0049] The right end of the first metal rod 131 and the left end of the second metal rod 132 are both located in the rubber cushion metal sleeve 21, the connecting rod 22 is inserted through the first metal rod 131, the connecting rod 22 and the first metal rod 131 are arranged perpendicular to each other, the connecting rod 22 is a 50mm×50mm×10mm rectangular parallelepiped, the rubber cushion metal sleeve 21 is a hollow cylindrical sleeve, the rubber friction pad 23 is annular, the rubber friction pad 23 is fixed to the inside of the rubber cushion metal sleeve 21, and the rectangular parallelepiped should be at 2 / 3 of the SMA rod 13, so as to ensure that the SMA When the rod 13 is under pressure or tension, the passive energy dissipation system can be activated by compressing the rubber friction pad layer on the corresponding side. Several rubber friction pad layers 23 are sleeved on the first metal rod 131. The contact surface between the connecting rod 22 on the first metal rod 131 and the rubber friction pad layer 23 is coated with lubricant to reduce friction resistance. The lubricant can be molybdenum disulfide. Among them, a rubber anti-skid plate 24 is provided in the rubber pad metal sleeve 21. The rubber anti-skid plate 24 is located at the bottom of the several rubber friction pad layers 23 and is sleeved on the right end of the first metal rod 131.

[0050] Furthermore, the secondary energy dissipation component 3 includes an MRE container 31, which is located on the right side of the rubber cushion metal sleeve 21 and the two are fixedly connected. An MRE energy dissipation module 32 is provided in the MRE container 31. The right end of the second metal rod 132 passes horizontally through the rubber cushion metal sleeve 21 and is inserted into the MRE container 31. The right end of the second metal rod 132 is connected to the MRE energy dissipation module 32. The MRE container 31 is a magnetorheological elastomer container, which is a small quadrilateral iron container welded On the beam end fixing plate 12, and connected to the rubber cushion metal sleeve 21, the end of the shape memory SMA rod 13 is bent, that is, the second metal rod 132 can pass through this container horizontally. The MRE energy dissipation module 32 is a magnetorheological elastomer MRE energy dissipation module 32. The right side of the MRE container 31 is fixedly connected to the single-chip microcomputer 33, which is fixed to the beam end fixing plate 12. The single-chip microcomputer 33 is set on the beam end fixing plate 12. After the device is installed, the corresponding threshold is set to ensure the dual control startup of the device;

[0051] The invention also includes a displacement sensor 34 fixedly installed at the junction of the beam and column. The displacement sensor 34 is arranged at the junction of the beam and column, connected to the MRE energy consumption module 32, and the electromagnetic field of the MRE energy consumption module 32 is turned on when the deformation threshold is reached. The displacement sensor 34 and the MRE energy consumption module 32 are both electrically connected to the single-chip microcomputer 33;

[0052] Furthermore, the MRE energy consumption module 32 is filled with MRE material, and an electromagnetic coil 321 is provided in the MRE energy consumption module 32 . A current controller 322 is provided inside the electromagnetic coil 321 . Both the electromagnetic coil 321 and the current controller 322 are electrically connected to the single chip microcomputer 33 .

[0053] The MRE energy consumption module 32 is placed in the MRE container 31. The MRE energy consumption module 32 has a built-in electromagnetic coil 321 and is filled with MRE material. A current controller 322 is set inside it. The current controller 322 integrates a charge amplifier and a DQA system to detect deformation and adjust the stiffness by guiding the magnetic field by changing the current strength. The corresponding starting threshold is set and it is activated when the deformation threshold is reached.

[0054] Furthermore, a sliding support bearing 35 is horizontally provided at the bottom of the second metal rod 132 in the rubber cushion metal sleeve 21 , and the sliding direction of the support bearing 35 is the same as the length direction of the second metal rod 132 .

[0055] A hierarchical multi-state dual-control energy-consuming node reinforcement method based on rubber, SMA and MRE includes the following steps:

[0056] S1: First, prepare an SMA rod 13 with a length of about 650 mm. The SMA rod 13 consists of a first metal rod 131 and a second metal rod 132. The first metal rod 131 is arranged obliquely and has a length of 500 mm. The second metal rod 132 is arranged horizontally and has a length of 150 mm.

[0057] S2: Install the column end fixing plate 11 and the beam end fixing plate 12 on the beam column, tighten the bolts on the column end fixing plate 11 and the beam end fixing plate 12 to the designed preload, then fix the left end of the first metal rod 131 in the SMA rod 13 on the column end fixing plate 11, then insert the rubber cushion metal sleeve 21 and embed the rubber friction cushion 23, so that the entire SMA rod 13 passes through the rubber cushion metal sleeve 21 and points to the beam end fixing plate 12;

[0058] S3: The rubber pad metal sleeve 21 is then welded and fixed to the beam end fixing plate 12, and a circular rubber friction pad 23 is placed. The rubber friction pad 23 is distributed on both sides of the connecting rod 22, with one side being arranged on the upper left side of the connecting rod 22 and the other side being arranged on the lower right side of the connecting rod 22;

[0059] S4: Next, weld the MRE container 31 to the beam end fixing plate 12, and then install the MRE energy consumption module 32. Weld the MRE container 31 on the beam end fixing plate 12, and place the MRE energy consumption module 32 and the single-chip microcomputer 33. Connect the power line of the electromagnetic coil 321 and the displacement sensor 34 to the single-chip microcomputer 33. Connect the MRE energy consumption module 32 and the current controller 322 to the single-chip microcomputer 33, build the circuit and debug the trigger threshold. Then, set the displacement sensor 34 at the junction of the beam and column to detect the piezoelectric effect or the relative displacement of the beam-column node. Among them, a support bearing 35 with a sliding contact surface is configured at the bottom of the second metal rod 132 to ensure that the SMA rod 13 acts on the MRE energy consumption module 32 when strain occurs.

[0060] When in use, first, prepare an SMA rod 13 with a length of about 650 mm. The SMA rod 13 consists of a first metal rod 131 and a second metal rod 132. The first metal rod 131 is set at an angle and has a length of 500 mm. The second metal rod 132 is set horizontally and has a length of 150 mm.

[0061] Secondly, install the column end fixing plate 11 and the beam end fixing plate 12 on the beam column, tighten the bolts on the column end fixing plate 11 and the beam end fixing plate 12 to the designed preload, then fix the left end of the first metal rod 131 in the SMA rod 13 to the column end fixing plate 11, then insert the rubber cushion metal sleeve 21 and embed the rubber friction cushion 23, so that the SMA rod 13 as a whole passes through the rubber cushion metal sleeve 21 and points to the beam end fixing plate 12, wherein the connecting rod 22 is a rectangular parallelepiped with dimensions of 50mm×50mm×10mm;

[0062] Then, the rubber cushion metal sleeve 21 is welded and fixed on the beam end fixing plate 12, and a circular rubber friction pad 23 is placed. The rubber friction pad 23 is distributed on both sides of the connecting rod 22, one side is set on the upper left side of the connecting rod 22, and the other side is set on the lower right side of the connecting rod 22. Among them, the rubber cushion metal sleeve 21 is a cylindrical sleeve with an inner diameter of 70mm, an outer diameter of 90mm, and a length of 200mm; the rubber friction pad 23 is a circular ring with an inner diameter of Φ50mm, an outer diameter of Φ70mm, and a thickness of 10mm. The rubber friction pad 23 is symmetrically arranged on both sides and contacts the connecting rod 22 on the SMA rod 13 to provide friction energy dissipation;

[0063] Finally, the MRE container 31 is welded to the beam end fixing plate 12. The MRE container 31 is a small quadrilateral iron container with a size of 300mm×150mm×100mm. The magnetic field strength can be adjusted from 0 to 1T. It is welded to the beam end fixing plate 12 and connected to the rubber cushion metal sleeve 21. The horizontal section of the SMA rod 13, that is, the second metal rod 132, passes horizontally through the container opening and overlaps with the MRE energy dissipation module 32. Then, the MRE energy dissipation module 32 is installed. The MRE energy dissipation module 32 has a built-in electromagnetic coil 321 and MRE material. The electromagnetic coil 321 has a wire diameter of Φ1mm and 500 turns. The MRE material is a carbonyl iron powder / silicone rubber composite. The material has a 300% increase in stiffness under a magnetic field. Next, the MRE container 31 is welded to the beam end fixing plate 12, and the MRE energy consumption module 32 and the single-chip microcomputer 33 are placed. The power line of the electromagnetic coil 321 and the displacement sensor 34 are connected to the single-chip microcomputer 33. The MRE energy consumption module 32 and the current controller 322 are connected to the single-chip microcomputer 33. The circuit is built and the trigger threshold is debugged. Subsequently, a displacement sensor 34 is set at the junction of the beam and column to detect the piezoelectric effect or the relative displacement of the beam-column node. Among them, a support bearing 35 with a sliding contact surface is configured at the bottom of the second metal rod 132 to ensure that the SMA rod 13 acts on the MRE energy consumption module 32 when strain occurs.

[0064] In addition, the displacement sensor 34, the single-chip microcomputer 33 and the current controller 322 form an adaptive trigger mechanism. The displacement sensor 34 is an LVDT displacement sensor 34 with an accuracy of ±0.01mm. It is installed at the junction of the beam and column to monitor the deformation in real time. The current controller 322 is used to set the single-chip microcomputer 33 and connect the charge amplifier and the DQA system to detect deformation, receive sensor signals, or sense the deformation detected by the DQA system and output PWM signals to control the on / off of the electromagnetic coil 321 and the magnetic field strength.

[0065] The output signal of the displacement sensor 34 is conditioned by the amplifier and then input into the single chip microcomputer 33, and a two-level trigger threshold is set as follows:

[0066] Level 1: 1.5% inter-story displacement angle → switching on and off 0.3T magnetic field;

[0067] Level 2: 2% inter-story displacement angle → switching on and off 0.8T magnetic field;

[0068] Two-level triggering conditions: When a high-intensity earthquake occurs, the angular displacement of the beam-column node is detected by the displacement sensor 34. When the deformation reaches 1.5% of the inter-story displacement angle, the first stage magnetic field (0.3T) is activated. When it reaches 2%, the second stage magnetic field (0.8T) is activated; or the piezoelectric effect of the magnetorheological elastomer is sensed, and its threshold is V th =1.3kΔ, Δ=0.025θ, k is the MRE piezoelectric sensitivity.

[0069] Two-level energy consumption mechanism:

[0070] First stage energy consumption (small deformation stage)

[0071] SMA superelastic deformation: When the node has an interlayer displacement angle of ≤1%, the SMA rod 13 is deformed by compression / tension and dissipates energy through the reverse restoring force;

[0072] Rubber friction energy consumption: sliding friction between the contact surface of the SMA rod cuboid and the rubber friction pad layer 23.

[0073] Second stage energy consumption (large deformation stage)

[0074] MRE stiffness adjustment: When the displacement reaches 1.5%, the microcontroller 33 triggers the electromagnetic coil 321 to energize, generating a 0.3T magnetic field to increase the MRE stiffness to 1.5 times the original value;

[0075] Collaborative energy dissipation: When the deformation continues to 2%, the magnetic field increases to 0.8 T, and the MRE stiffness increases to 3 times, jointly bearing the load and dissipating energy with the SMA rod 13 and the rubber friction pad 23.

[0076] High-intensity active control of energy consumption: When the deformation continues to increase, the charge amplifier and DQA system intervene to improve energy consumption efficiency through active control.

[0077] Material selection:

[0078] SMA rod: Ni-Ti alloy (phase transition temperature 30°C, elastic modulus 80 GPa);

[0079] Rubber friction pad 23: silicone rubber (hardness 60HA, temperature resistance -50℃~200℃);

[0080] MRE material: carbonyl iron powder / silicone rubber composite material (density 1.8g / cm 3 , shear modulus under magnetic field ≥500kPa).

[0081] Process requirements:

[0082] Pretreatment of the rubber friction pad 23: vulcanization treatment (temperature 150°C, pressure 10 MPa, time 30 min) to improve wear resistance;

[0083] Insulation of electromagnetic coil 321: The conductor is wrapped with polyimide (PI) film, and the withstand voltage is ≥1000V.

[0084] In summary, the present invention provides a hierarchical multi-state dual-control energy dissipation node reinforcement device based on rubber, SMA and MRE and a reinforcement method thereof, which realizes multi-state controlled energy dissipation through the coordinated work of SMA superelasticity, rubber friction and MRE variable stiffness characteristics, and as the device enters the active control stage, it retains the passive energy dissipation mode while adding new active energy dissipation components, which not only solves the problem of insufficient energy dissipation capacity, rigid reinforcement easily leading to brittle failure of nodes, and difficulty in dissipating energy through plastic deformation, but also solves the problem of limited adaptability and inability to set a multi-level energy dissipation mechanism according to the load size, so that when the load is too large, the energy dissipation capacity is insufficient, and when the load is too small, the energy dissipation capacity is excessive. At the same time, it solves the problem that in the existing technology, magnetorheological materials and shape memory alloys have been used for structural energy dissipation, but are mostly limited to a single energy dissipation mode, and it is difficult to take into account the performance requirements of different deformation stages.

[0085] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A hierarchical multi-state dual-control energy-consuming node reinforcement device based on rubber, SMA and MRE, characterized by: The invention comprises a reinforcement component (1) arranged at the junction of a beam and a column, wherein the reinforcement component (1) comprises a column end fixing plate (11) and a beam end fixing plate (12), wherein the column end fixing plate (11) is fixed to the vertical end of the beam and the column, and the beam end fixing plate (12) is fixed to the horizontal end of the beam and the column; An SMA rod (13) is provided between the column end fixing plate (11) and the beam end fixing plate (12); a primary energy dissipation component (2) is provided on the SMA rod (13); a secondary energy dissipation component (3) is provided on the beam end fixing plate (12); one end of the SMA rod (13) is connected to the column end fixing plate (11), and the other end of the SMA rod (13) is connected to the secondary energy dissipation component (3).

2. The hierarchical multi-state dual-control energy-consuming node reinforcement device based on rubber, SMA and MRE according to claim 1, characterized in that: The primary energy dissipation component (2) comprises a rubber cushion metal sleeve (21), the rubber cushion metal sleeve (21) is sleeved on the SMA rod (13), and the rubber cushion metal sleeve (21) is fixed on the beam end fixing plate (12); The portion of the SMA rod (13) located in the rubber cushion metal sleeve (21) is fixedly connected to a connecting rod (22); a plurality of rubber friction pads (23) are provided in the rubber cushion metal sleeve (21); the plurality of rubber friction pads (23) are distributed on both sides of the connecting rod (22); and the rubber friction pads (23) are sleeved on the SMA rod (13).

3. The hierarchical multi-state dual-control energy-consuming node reinforcement device based on rubber, SMA and MRE according to claim 2, characterized in that: The SMA rod (13) is composed of a first metal rod (131) arranged obliquely with the left side higher and the right side lower, and a second metal rod (132) arranged horizontally; The left end of the first metal rod (131) is fixedly connected to the column end fixing plate (11), the right end of the first metal rod (131) is fixedly connected to the left end of the second metal rod (132), and the right end of the second metal rod (132) is connected to the secondary energy dissipation component (3); The right end of the first metal rod (131) and the left end of the second metal rod (132) are both located in the rubber pad metal sleeve (21), the connecting rod (22) is inserted through the first metal rod (131), the connecting rod (22) and the first metal rod (131) are arranged perpendicular to each other, and a plurality of the rubber friction pads (23) are all sleeved on the first metal rod (131).

4. The hierarchical multi-state dual-control energy-consuming node reinforcement device based on rubber, SMA and MRE according to claim 3, characterized in that: A rubber anti-slip plate (24) is provided in the rubber pad metal sleeve (21), and the rubber anti-slip plate (24) is located at the bottom of the plurality of rubber friction pads (23). The rubber anti-slip plate (24) is sleeved on the right end of the first metal rod (131).

5. The hierarchical multi-state dual-control energy-consuming node reinforcement device based on rubber, SMA and MRE according to claim 3, characterized in that: The length of the first metal rod (131) is 500 mm, and the length of the second metal rod (132) is 150 mm; The rubber cushion metal sleeve (21) is a hollow cylindrical sleeve, and the rubber friction cushion (23) is in the shape of a ring.

6. The hierarchical multi-state dual-control energy-consuming node reinforcement device based on rubber, SMA and MRE according to claim 3, characterized in that: The secondary energy dissipation component (3) includes an MRE container (31), the MRE container (31) is located on the right side of the rubber cushion metal sleeve (21) and the two are fixedly connected, an MRE energy dissipation module (32) is provided in the MRE container (31), a single chip microcomputer (33) is fixedly connected to the right side of the MRE container (31), and the single chip microcomputer (33) is fixed on the beam end fixing plate (12); It also includes a displacement sensor (34) fixedly installed at the junction of the beam and column, and the displacement sensor (34) and the MRE energy consumption module (32) are both electrically connected to the single chip computer (33); The right end of the second metal rod (132) passes horizontally through the rubber cushion metal sleeve (21) and is inserted into the MRE container (31), and the right end of the second metal rod (132) is connected to the MRE energy consumption module (32).

7. The hierarchical multi-state dual-control energy dissipation node reinforcement device based on rubber, SMA and MRE according to claim 6, characterized in that: The MRE energy consumption module (32) is filled with MRE material, and an electromagnetic coil (321) is provided in the MRE energy consumption module (32). A current controller (322) is provided inside the electromagnetic coil (321), and both the electromagnetic coil (321) and the current controller (322) are electrically connected to the single chip computer (33).

8. The hierarchical multi-state dual-control energy-consuming node reinforcement device based on rubber, SMA and MRE according to claim 6, characterized in that: A sliding support bearing (35) is horizontally provided in the rubber cushion metal sleeve (21) at the bottom of the second metal rod (132).

9. A hierarchical multi-state dual-control energy consumption node reinforcement method based on rubber, SMA and MRE, characterized by: The steps include: S1: First, a SMA rod (13) with a length of about 650 mm is prepared. The SMA rod (13) consists of a first metal rod (131) and a second metal rod (132). The first metal rod (131) is tilted and has a length of 500 mm. The second metal rod (132) is horizontally arranged and has a length of 150 mm. S2: Install the column end fixing plate (11) and the beam end fixing plate (12) on the beam column, tighten the bolts on the column end fixing plate (11) and the beam end fixing plate (12) to the designed preload, then fix the left end of the first metal rod (131) in the SMA rod (13) on the column end fixing plate (11), then insert the rubber cushion metal sleeve (21), and embed the rubber friction cushion (23), so that the SMA rod (13) as a whole passes through the rubber cushion metal sleeve (21) and points to the beam end fixing plate (12); S3: The rubber pad metal sleeve (21) is then welded and fixed on the beam end fixing plate (12), and a circular rubber friction pad (23) is placed. The rubber friction pad (23) is distributed on both sides of the connecting rod (22), with one side being arranged on the upper left side of the connecting rod (22) and the other side being arranged on the lower right side of the connecting rod (22); S4: Then weld the MRE container (31) to the beam end fixing plate (12), and then install the MRE energy consumption module (32), weld the MRE container (31) on the beam end fixing plate (12), and place the MRE energy consumption module (32) and the single chip microcomputer (33), connect the power line of the electromagnetic coil (321) and the displacement sensor (34) to the single chip microcomputer (33), connect the MRE energy consumption module (32) and the current controller (322) to the single chip microcomputer (33), build the circuit and debug the trigger threshold, and then set the displacement sensor (34) at the junction of the beam and column to detect the piezoelectric effect or the relative displacement of the beam and column node, wherein a support bearing (35) with a sliding contact surface is configured at the bottom of the second metal rod (132) to ensure that the SMA rod (13) acts on the MRE energy consumption module (32) when strain occurs.

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