Metal composite friction damper

Abstract

The invention relates to a metal composite friction damper which comprises a main plate, an outer connecting piece, a shearing assembly and a friction assembly, friction plates are arranged on the opposite faces of an upper cover plate and a lower cover plate, and a friction gap is formed between the two friction plates; the main plate is sleeved in the friction gap through the through hole; a kidney-shaped hole is formed in the main plate, and the fastening bolt pulls the upper cover plate and the lower cover plate oppositely through the kidney-shaped hole so that the friction plate can be tightly attached to the surface of the main plate. The plurality of shearing sheets are uniformly fixed between the first shearing plate and the second shearing plate, so that the two shearing plates are correspondingly combined together, and a shearing energy consumption area is formed in the middle; when the main plate slides in a reciprocating mode under the action of external force, the first shearing plate and the second shearing plate can move in a staggered mode. Assembly type combination of shear energy consumption of the low-yield-point steel shear plates and friction energy consumption of the friction plates is achieved, the structure is simple, force transmission is clear, the maintenance cost is low, and good energy consumption characteristics and energy consumption efficiency are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of energy dissipation and shock absorption of building structures, and in particular to a metal composite friction damper. Background Art

[0002] In order to resist or weaken the impact of earthquakes on building components, energy dissipation and shock absorption devices have been increasingly used in construction of building structures in recent years. Commonly used energy dissipation dampers include viscous dampers, metal dampers and friction dampers, among which metal dampers and friction dampers are more widely used in engineering, with low cost and easy manufacturing.

[0003] However, most yield-type metal energy dissipation and shock-absorbing components are designed for small earthquakes and only play an energy dissipation role in medium and large earthquakes. Under frequent earthquakes, their structural deformation is small, and they may not even yield or enter a weak nonlinear state. They have low energy dissipation efficiency and poor economy, and cannot adapt to earthquakes of different intensities. However, the hysteresis curve of the friction damper is approximately rectangular, and its energy dissipation efficiency is high under frequent earthquakes.

[0004] The friction damper converts the friction force into heat energy dissipation through the friction caused by the relative displacement between the metal material and the friction material, thereby dissipating the energy of the seismic vibration and reducing the vibration response of the structure. However, as the intensity of the earthquake increases, the sliding friction force of the friction damper does not change, and the shock absorption effect is not ideal. The friction dampers commonly used in engineering currently provide stiffness before sliding. Once entering the sliding energy dissipation state, their stiffness will decrease or even approach zero.

[0005] Based on this, it is necessary to study a metal composite friction damper. Summary of the invention

[0006] In view of this, the object of the present invention is to provide a metal composite friction damper, which effectively solves the existing yield mechanism and energy consumption limitations, as well as the problems of insufficient stiffness and unsatisfactory shock absorption effect.

[0007] To achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a metal composite friction damper, including a main board, an external connecting member, a shearing assembly and a friction assembly, the friction assembly including a limit plate, an upper cover plate, a lower cover plate, a fastening bolt and a friction plate; the upper cover plate and the lower cover plate are arranged at intervals, and the limit plate is fixed on both sides of the two cover plates; the friction plates are arranged on the opposite surfaces of the upper cover plate and the lower cover plate, and a friction gap is formed between the two friction plates; the limit plate is provided with a corresponding through hole corresponding to the friction gap, and the main board is fitted into the friction gap through the through hole; a waist hole is provided on the main board, and the fastening bolt pulls the upper cover plate and the lower cover plate oppositely through the waist hole so that the friction plate is tightly attached to the surface of the main board; the shearing assembly includes an upper shearing member, a lower shearing member, a first push plate and a second push plate, and the first push plate and the second push plate are respectively arranged on the main board outside the limit plate , and the first push plate is slidably mounted on the main board, and the second push plate is fixedly mounted on the main board, and the upper and lower shearing members are arranged between the two adjacent push plates and are distributed on the upper and lower sides of the friction assembly; the upper and lower shearing members respectively include a first shearing plate, a second shearing plate and a shearing sheet, and multiple shearing sheets are evenly fixed between the first shearing plate and the second shearing plate, so that the two shearing plates are correspondingly combined together, and a shearing energy dissipation zone is formed in the middle; one end of the first shearing plate and the second shearing plate are respectively fixedly connected to the inner side walls of the first push plate and the second push plate, and the other ends of the two shearing plates are respectively slidably inserted into the push plates on both sides, and when the main board slides back and forth under the action of external force, the first shearing plate and the second shearing plate can be misaligned; the external connecting member is arranged on the outer side of the limit plate and is fixedly connected to the first push plate, an assembly area is provided in the external connecting member, and the limit plates on both sides are fixed in the assembly area.

[0008] Furthermore, the main board is symmetrically fixed with limit seats, and adjacent limit seats are clamped and fixed on the inner and outer sides of the second push plate. When the main board is subjected to a force, the second push plate can be driven to move synchronously through the limit seats.

[0009] Furthermore, the first shear plate and the second shear plate have the same structure, both of which are L-shaped structures. Shear grooves are evenly opened on the side walls of the opposite surfaces of the first shear plate and the second shear plate. Each shear plate is inserted into the shear groove and fixed by bolts, thereby forming a shear energy dissipation zone in the middle.

[0010] Further, the first shear plate and the second shear plate in the upper and lower shear members located at the upper and lower sides between the first push plate and the second push plate are arranged in opposite combinations.

[0011] Furthermore, sliding holes are opened on the side walls of the first push plate and the second push plate, one end of the first shear plate and the second shear plate are respectively fixedly connected to the inner wall of the first push plate and the second push plate by bolts, and the other end is respectively matched and slidably inserted into the sliding holes on the corresponding side push plates.

[0012] Furthermore, the friction assembly also includes a stainless steel sheet, which is made of NAO material. The stainless steel sheet is fixed to the upper and lower surfaces of the main board, and the fastening bolts are used to pull and fix the upper cover plate and the lower cover plate through the waist holes to make the friction sheet tightly attached to the stainless steel sheet on the surface of the main board.

[0013] Furthermore, the outer end of the external connector extends outward to form a connecting portion, and the open end of the external connector is bent inward to form an inner socket. A strip-shaped inner socket also extends correspondingly from the inner cavity side wall, and the surrounding inner sockets together form an assembly area.

[0014] Furthermore, when the limiting plate is matched and mounted in the assembly area, the opposite side walls of the inner holders on both sides are in contact with the outer side walls of the limiting plate respectively, and the outer connecting member can be sleeved on the outer side of the limiting plate through the pin shaft.

[0015] Furthermore, a fixing seat is provided in the inner cavity of the outer connecting member between the inner clamping seat and the connecting portion, and the inner wall of the fixing seat contacts and is fixed to the outer wall of the first push plate, thereby fixing the first push plate to the outer connecting member.

[0016] The beneficial effects of the above technical solution are: The metal composite friction damper proposed in the present invention realizes the assembled combination of shear energy dissipation of the low-yield point steel shear plate and friction energy dissipation of the friction plate. The low-yield point steel is different from the traditional structural steel which is mainly used in the elastic stage. The low-yield point steel becomes plastic within a small strain and has a high plastic deformation capacity. The yield strength deviation is small, the ductility is excellent, the low-cycle fatigue performance is superior, and it can be recycled and reused, which keeps the cost to a minimum and greatly reduces the maintenance time and maintenance cost.

[0017] The present invention enhances the energy dissipation capacity of the friction damper on the basis of the metal damper, and improves its energy dissipation efficiency under frequent earthquakes on the basis of the metal damper. By setting the upper and lower shear pieces, the steel shear pieces can be used to provide a certain stiffness when the stiffness of the friction unit decreases, and the metal plate enters the energy dissipation state after yielding, which can further improve the energy dissipation effect of the damper, thereby realizing the staged yielding and dual-stage energy dissipation effect of the damper.

[0018] Furthermore, when the stiffness of the friction unit decreases, the steel shear plate in the shear assembly provides a certain stiffness and dissipates energy through the plastic deformation of the shear plate. At this time, the damper is in the first stage of yield and energy dissipation state; when the metal plate yields, it enters the energy dissipation state, further improving the energy dissipation effect of the damper and realizing the second stage of yield and energy dissipation of the damper; the hysteresis curve of the metal composite friction damper is a three-line type, realizing the staged yield and two-stage energy dissipation effect of the damper.

[0019] The damper provided by the present invention can be assembled in a building during actual construction to provide assembled friction shear energy dissipation support, see Fig.10 It can effectively solve the problem that traditional buckling restrained supports have large plastic deformation after an earthquake, are severely damaged and difficult to repair or have high repair costs, and cannot be used any longer, requiring the building to be demolished, which seriously affects the building's post-earthquake recovery capacity.

[0020] The damping support structure provided by the present invention can not only provide the function of seismic energy dissipation, but also realize the dual-stage energy dissipation effect and improve the energy dissipation efficiency. Moreover, it is assembled in an assembled manner, and the materials are easy to obtain, the assembly is simple, and the construction is convenient. When the building structure support is constructed, it can be assembled in batches in the factory or assembled on site. It has good applicability, can achieve low or no damage to the structural components after the earthquake, and can also achieve energy dissipation under the action of earthquakes with different defense levels. It has low maintenance cost and high cost performance. It also helps to promote the development of environmental protection functional structures and the realization of resilient building goals, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of an implementation structure of the present invention; Figure 2 It is a schematic diagram of the implementation structure of the friction component; Figure 3 It is a front view structural schematic diagram of the friction component; Figure 4 It is a front view structural schematic diagram of the shearing component; Figure 5 It is a schematic diagram of the assembly structure of the shear piece; Figure 6 It is a schematic diagram of the implementation structure of the external connecting member; Figure 7 is a schematic diagram of the top view of the structure of the external connecting member; Figure 8 is another schematic diagram of the structure of the shearing piece; Fig. 9 Schematic diagram of shear deformation of the mainboard under different stress states; Fig.10 It is a schematic diagram of different assembly positions of the present invention in a building structure.

[0022] Figure markings: 1-main board, 2-shear assembly, 3-external connecting member, 4-connecting part, 5-fixed seat, 6-inner clamping seat, 7-assembly area, 8-friction assembly, 9-limiting seat, 10-upper cover plate, 11-lower cover plate, 12-stainless steel sheet, 13-friction plate, 14-waist hole, 15-fastening bolt, 16-clutch groove, 17-limiting plate, 18-rectangular groove, 19-friction gap, 20-through hole, 21-first push plate, 22-second push plate, 23-upper shear member, 24-lower shear member, 25-shear plate, 26-first shear plate, 27-second shear plate, 28-sliding hole, 29-shear groove. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Embodiment 1, this embodiment aims to provide a metal composite friction damper, which is mainly used to weaken the impact of earthquakes on buildings and realize the consumption of earthquake energy. Metal dampers and friction dampers are widely used energy dissipators in engineering, with low cost, easy to manufacture, and each has its own advantages in force performance. In view of the yield mechanism and energy consumption limitations existing in existing energy dissipation and shock absorption devices, as well as the problems of insufficient stiffness and unsatisfactory shock absorption effect, the present invention proposes a metal composite friction damper, which realizes the assembly combination of shear energy consumption of low-yield point steel shear plates and friction energy consumption of friction plates, and enhances its energy consumption capacity on the basis of friction dampers, and improves its energy consumption efficiency under frequent earthquakes on the basis of metal dampers, so as to realize the staged yield and dual-stage energy consumption effect of the damper.

[0024] like Figure 1-7 As shown, the present embodiment provides a metal composite friction damper, including a main board 1, an external connection member 3, a shear assembly 2 and a friction assembly 8, as shown in FIG. Figure 2 and 3 As shown, the friction assembly 8 in this embodiment includes a limit plate 17, an upper cover plate 10, a lower cover plate 11, a fastening bolt 15 and a friction plate 13; in this embodiment, the limit plate 17 is a rectangular structure, with a through hole 20 in the middle, and the main board 1 is matched and slidably mounted in the through holes 20 of the two limit plates 17. When the main board 1 is subjected to a force, it can slide back and forth in the two limit plates 17.

[0025] like Figure 2As shown, the upper cover plate 10 and the lower cover plate 11 are arranged vertically spaced and located between the left and right limit plates 17. The opposite surfaces of the limit plates 17 on the upper and lower sides of the main board 1 are provided with corresponding card slots 16, so that the left and right ends of the upper cover plate 10 and the lower cover plate 11 are respectively matched and fixedly mounted in the card slots 16 at the corresponding positions. Furthermore, rectangular slots 18 are evenly opened on the lower bottom surface of the upper cover plate 10 and the top surface of the lower cover plate 11, and the friction plates 13 are respectively fixedly mounted in the corresponding rectangular slots 18, and the outer ends extend out of the rectangular slots 18, so that a friction gap 19 is formed between the upper and lower friction plates 13, as shown in FIG. Figure 3 As shown, the main board 1 is inserted into the friction gap 19 through the through hole 20 on the limit plate 17. In this embodiment, stainless steel sheets 12 are respectively fixed on the upper and lower surfaces of the main board 1. Waist holes 14 are symmetrically opened on the main board 1 outside the stainless steel sheet 12, and the fastening bolts 15 pull the upper cover plate 10 and the lower cover plate 11 oppositely through the waist holes 14 to make the friction plate 13 tightly attached to the stainless steel sheet 12 on the surface of the main board 1.

[0026] Therefore, when the main board 1 slides left and right in the through hole 20 of the limit plate 17, the stainless steel plate 12 on the main board 1 can slide relative to the friction plate 13 to generate friction. Such a setting can convert seismic energy into heat energy through friction and dissipate it into the surrounding environment to reduce the vibration of the building structure.

[0027] In this embodiment, the friction plate 13 in the middle and the stainless steel plate 12 are used for energy consumption. The friction plate 13 is made of NAO material, which has good friction performance and can maintain a stable friction coefficient under different temperature and humidity conditions, ensuring that the friction damper can work effectively in various environments. At the same time, it has good wear resistance and can maintain good friction performance in long-term use, reducing replacement frequency and maintenance costs. At the same time, the noise generated during the friction process is small, and it can also maintain stable friction performance at high temperatures to improve reliability.

[0028] like Figure 4-6 As shown, the shearing assembly 2 is arranged on the outside of the friction assembly 8. In this embodiment, the shearing assembly 2 includes an upper shearing piece 23, a lower shearing piece 24, a first push plate 21 and a second push plate 22, wherein the first push plate 21 and the second push plate 22 are respectively arranged on the main board 1 outside the limit plate 17, and the first push plate 21 is slidably mounted on the main board 1, and the second push plate 22 is fixedly mounted on the main board 1. In the specific structure, corresponding rectangular holes are opened in the middle of the first push plate 21 and the second push plate 22, so that the two push plates are respectively matched and inserted on the main board 1, and are both located on the outside of the left and right limit plates 17.

[0029] like Figure 4As shown, two limit seats 9 are fixedly installed on the main board 1 at intervals (the limit seats 9 are fixed to the main board 1 by bolts), and the two limit seats 9 are symmetrically arranged on the inner and outer sides of the second push plate 22, and are tightly clamped with the inner and outer side walls of the push plate, so that the two limit seats 9 can tightly hold the second push plate 22 on the main board 1. When the main board 1 is forced to move back and forth, the clamping effect of the limit seats 9 on the second push plate 22 can synchronously drive the second push plate 22 to move left and right with the main board 1. At this time, the first push plate 21 is fixed together with the external connecting member 3 to form a fixed push plate, so that the main board 1 moves back and forth in the rectangular hole on the first push plate 21, and the position of the first push plate 21 is fixed.

[0030] Specifically, Figure 6 and Figure 7 As shown, in this embodiment, the external connecting member 3 is a U-shaped structure, with its opening facing the direction of the second push plate 22, and the outer end portion extends outward to form a connecting portion 4 for connecting to the main structure of the building. The external connecting member 3 is arranged on the outer side of the limit plate 17 and is fixedly connected to the second push plate 22. An assembly area 7 is provided in the external connecting member 3, and the limit plates 17 on both sides are fixed in the assembly area 7.

[0031] In the specific implementation structure, the open end of the external connector 3 is bent inward to form an internal card seat 6, and the inner cavity side wall thereof also corresponds to a relatively extending strip-shaped internal card seat 6, and the surrounding internal card seats 6 together form an assembly area 7 of the external connector 3. When the limit plate 17 on the main board 1 is matched and clamped in the assembly area 7, the opposite side walls of the internal card seats 6 on both sides are respectively in contact with the outer side wall of the limit plate 17, and the external connector 3 can be sleeved on the outer side of the limit plate 17 through the pin shaft. In addition, a fixing seat 5 is also provided in the inner cavity of the external connector 3 between the internal card seat 6 and the connecting portion 4, and the inner wall of the fixing seat 5 is in contact with and fixed to the outer side wall of the first push plate 21, thereby fixing the first push plate 21 on the external connector 3.

[0032] In actual application, the connecting portion 4 of the external connecting member 3 is fixedly connected to the building structure, thereby providing a fixed foundation for the second push plate 22, and at the same time confining the friction component 8 in the assembly area 7 therein to form a friction energy dissipation system, thereby improving its energy dissipation efficiency under frequent earthquakes.

[0033] like Figure 5 and 6As shown, in this embodiment, the upper and lower shearing members 24 are arranged between the first push plate 21 and the second push plate 22, and are distributed on the upper and lower sides of the friction assembly 8; wherein the upper and lower shearing members 24 respectively include a first shearing plate 26, a second shearing plate 27 and a shearing piece 25, the first shearing plate 26 and the second shearing plate 27 have the same structure, and both have an L-shaped structure in appearance, and the first shearing plate 26 and the second shearing plate 27 in the upper and lower shearing members 24 between adjacent push plates are arranged in opposite combinations. A plurality of shearing pieces 25 are evenly fixed between the first shearing plate 26 and the second shearing plate 27, and when the first shearing plate 26 and the second shearing plate 27 are respectively fixedly connected to the push plates on both sides, the head and tail ends of the two are respectively combined together to form an internal hollow shearing energy dissipation zone.

[0034] In the specific structure, shear grooves 29 are evenly opened on the side walls of the first shear plate 26 and the second shear plate 27. In this embodiment, the shear piece 25 is wide at both ends and shrinks inward in the middle, similar to an X-shaped structure (in actual application, the structure of the shear piece can be adaptively designed and replaced). After each shear piece 25 is inserted into the shear groove 29, the front and rear ends of the shear piece 25 are locked and fixed to the first shear plate 26 and the second shear plate 27 by bolts, thereby forming a shear energy consumption zone in the area where the shear piece 25 is located, and the shear capacity is provided by the steel shear plate for energy consumption, and the thickened area of ​​the shear plate on the outside is used to prevent out-of-plane buckling due to shear deformation.

[0035] like Figure 5 As shown, sliding holes 28 are opened on the side walls of the first push plate 21 and the second push plate 22, one end of the first shear plate 26 and the second shear plate 27 are respectively fixedly connected to the inner wall of the first push plate 21 and the second push plate 22 by bolts, and the other end is respectively slidably inserted into the sliding holes 28 on the corresponding side push plates, so that when the main board 1 slides back and forth under the action of external force, the first shear plate 26 and the second shear plate 27 can be displaced in the opposite direction, thereby consuming the seismic energy through the plastic deformation of the middle shear plate 25.

[0036] Working principle description: The metal composite friction damper provided in this embodiment is used in actual applications. Fig.10 As shown, during the construction of the building structure, the damper can be directly fixed and assembled with the main structural member to be damped to form a shear restraint support for the building, providing the function of earthquake resistance and energy dissipation. The external connection piece is the fixed end, and the main board is the load-bearing sliding end. When an earthquake occurs, the main board is subjected to tension and moves in the direction away from the external connection piece. Figure 5 and Fig. 9At the same time, the limit seat on the main board is used to drive the second push plate to move synchronously, and the stainless steel sheet on the main board moves outward. At this time, due to the restriction of the external connecting parts, friction is generated between the friction plates between the limit plates and the stainless steel sheet. At the same time, a misalignment occurs between the first shear plate and the second shear plate, causing the shear plates in the middle of the two to deform and shear. When the main board is subjected to an inward thrust again, the main board moves toward the direction close to the external connecting part, and at the same time, the second push plate synchronously drives the second shear plate to reset. At this time, sliding friction is generated between the stainless steel sheet on the main board and the friction plate again. Therefore, no matter whether the main board is subjected to thrust or tension, the shear direction of the low-yield point steel shear plate remains unchanged, and the shear capacity is provided by the steel shear plate, and energy is consumed by the friction between the middle friction plate and the stainless steel sheet, thereby reducing the possibility of out-of-plane buckling due to uneven force caused by in-plane defects to a certain extent.

[0037] Specifically, since the shear direction of the shear plate remains unchanged when it dissipates energy by shearing, the shear plate can continuously and effectively dissipate energy during the deformation process, avoiding poor energy transmission and ineffective loss of part of the energy due to frequent changes in the shear direction, thereby improving the overall energy consumption efficiency of the damper and reducing energy loss.

[0038] In addition, low-yield steel has good ductility, and the fixed shear direction enables it to fully enter the plastic deformation stage, better exerting the energy dissipation characteristics of the material, further improving the energy dissipation capacity of the damper, avoiding performance fluctuations caused by changes in the shear direction, and ensuring the stability and reliability of the damper during the entire use process, which can better meet the requirements of engineering structures for energy dissipation and shock absorption devices. During the stress process, in-plane defects may cause uneven stress, which in turn causes out-of-plane buckling. In this embodiment, the shear direction remains unchanged, so that the stress distribution of the shear plate when it is stressed is relatively uniform, reducing the uneven stress caused by in-plane defects, thereby reducing the possibility of out-of-plane buckling and enhancing the structural stability of the damper.

[0039] The metal composite friction damper provided by the present invention realizes the combination of shear energy dissipation of the low-yield point steel shear plate and friction energy dissipation of the friction plate with the assembly function, thereby enhancing the energy dissipation capacity of the friction damper on the basis of the friction damper, and improving its energy dissipation efficiency under frequent earthquakes on the basis of the metal damper. It has a wide range of materials, a simple structure, clear force transmission, and low maintenance cost, and has good energy dissipation characteristics and energy dissipation efficiency. It makes full use of structural components and improves the utilization rate of components, which is helpful to promote the development of environmentally friendly functional structures and the realization of resilient buildings, and has broad application prospects.

[0040] Embodiment 2: This embodiment further illustrates the installation structure of the shear piece.

[0041] The structure of the shear plate in this embodiment is as follows Figure 8As shown, a shearing piece with evenly opened waist holes is fixedly installed between the first shearing plate and the second shearing plate, and the two ends of the shearing piece are respectively fixedly connected to the shearing plates on both sides, so that when the shearing plate is forced to move left and right, the shearing piece in the shearing energy consumption area can be deformed. Specifically, as Fig. 9 As shown, area B is the shear energy dissipation area, and area G is the thickened area to prevent out-of-plane buckling caused by shear deformation. The main board and the external connector are fixedly connected to the structural members on both sides of the main structure of the building, as shown in Fig.10 As shown, the external connecting part is used as the fixed end and the main board is used as the force-bearing driving end. When subjected to tension or thrust, on the one hand, shear energy is consumed through the deformation of the shear plate, and on the other hand, energy is consumed through the sliding friction between the stainless steel plate and the friction plate on the main board. Therefore, regardless of whether it is under tension or compression, the shear direction of the low yield point steel shear plate remains unchanged.

[0042] The above-described embodiments of the present invention do not constitute a limitation on the protection scope of the present invention. The basic concept of the present invention is to enhance the energy dissipation capacity of the friction damper on the basis of the friction damper, and to improve its energy dissipation efficiency under frequent earthquakes on the basis of the metal damper. When the stiffness of the friction unit decreases, the steel shear sheet can be used to provide a certain stiffness. After the metal plate yields and enters the energy dissipation state, the energy dissipation effect of the damper can be further improved, thereby realizing the staged yielding and dual-stage energy dissipation effect of the damper. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A metal composite friction damper, characterized in that: The cam is provided with a plurality of fasteners, each of which is provided with a plurality of fasteners, and the plurality of fasteners are provided with a plurality of fasteners, and the plurality of fasteners are provided with a plurality of fasteners. The two push plates are fixedly mounted on the main board, and the upper and lower shearing members are arranged between the two adjacent push plates and distributed on the upper and lower sides of the friction assembly; the upper and lower shearing members respectively include a first shearing plate, a second shearing plate and a shearing piece, and a plurality of shearing pieces are evenly fixed between the first shearing plate and the second shearing plate, so that the two shearing plates are correspondingly combined together, and a shearing energy dissipation zone is formed in the middle; one end of the first shearing plate and the second shearing plate are respectively fixedly connected to the inner side walls of the first push plate and the second push plate, and the other ends of the two shearing plates are respectively slidably inserted on the push plates on both sides, and when the main board slides back and forth under the action of external force, the first shearing plate and the second shearing plate can be dislocated; the external connecting member is arranged on the outer side of the limit plate and is fixedly connected to the first push plate, and an assembly area is provided in the external connecting member, and the limit plates on both sides are fixed in the assembly area.

2. The metal composite friction damper according to claim 1, characterized in that: The main board is also symmetrically fixed with limiting seats, and adjacent limiting seats are clamped and fixed on the inner and outer sides of the second push plate. When the main board is subjected to a force, the limiting seats can drive the second push plate to move synchronously.

3. The metal composite friction damper according to claim 1, characterized in that: The first shear plate and the second shear plate have the same structure, both of which are L-shaped structures. Shear grooves are evenly opened on the side walls of the opposite surfaces of the first shear plate and the second shear plate. Each shear piece is inserted into the shear groove and fixed by bolts, thereby forming a shear energy dissipation zone in the middle.

4. The metal composite friction damper according to claim 1, characterized in that: The first shear plates and the second shear plates in the upper and lower shearing members between the first push plate and the second push plate are arranged in opposite combinations.

5. The metal composite friction damper according to claim 4, characterized in that: The side walls of the first push plate and the second push plate are provided with sliding holes, one end of the first shear plate and the second shear plate are respectively fixedly connected to the inner side walls of the first push plate and the second push plate by bolts, and the other end is respectively matched and slidably inserted into the sliding holes on the corresponding side push plates.

6. The metal composite friction damper according to claim 1, characterized in that: The friction assembly also includes a stainless steel sheet, which is made of NAO material and fixed to the upper and lower surfaces of the main board. The fastening bolts are used to pull and fix the upper cover plate and the lower cover plate through the waist holes so that the friction sheet is tightly attached to the stainless steel sheet on the surface of the main board.

7. The metal composite friction damper according to claim 1, characterized in that: The outer end of the outer connector extends outward to form a connecting portion, and the open end of the outer connector is bent inward to form an inner seat. A strip-shaped inner seat is also extended from the inner cavity side wall, and the surrounding inner seats together form an assembly area.

8. The metal composite friction damper according to claim 1, characterized in that: When the limiting plate is matched and clamped in the assembly area, the opposite side walls of the inner clamping seat on both sides are respectively in contact with the outer side walls of the limiting plate, and the outer connecting piece can be sleeved on the outer side of the limiting plate through the pin shaft.

9. The metal composite friction damper according to claim 7, characterized in that: A fixing seat is also provided in the inner cavity of the outer connecting member between the inner clamping seat and the connecting portion, and the inner wall of the fixing seat contacts and is fixed to the outer wall of the first push plate, thereby fixing the first push plate on the outer connecting member.

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