Metal composite friction damper

Abstract

The present application relates to a kind of metal composite type friction damper, including main plate, outer connecting piece, shear component and friction component, the opposite surface of upper cover plate and lower cover plate is provided with friction plate, and friction gap is formed between two friction plates;The main plate is sleeved with friction gap through through-hole;Waist hole is arranged on the main plate, and the upper cover plate and the lower cover plate are pulled to the main plate surface by the friction plate by fastening bolt through waist hole;Multiple shear pieces are uniformly fixed between first shear plate and second shear plate, so that two shear plates are correspondingly combined together, and shear energy dissipation zone is formed in the middle part;When the main plate reciprocatingly slides under the action of external force, dislocation movement between first shear plate and second shear plate can be generated.The present application realizes the assembly type combination of shear energy dissipation of low yield point steel shear plate and friction energy dissipation of friction plate, and has good energy dissipation characteristics and energy dissipation efficiency with simple structure, clear force transmission and low maintenance cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building structure energy dissipation and shock absorption, and particularly relates to a metal composite friction damper. BACKGROUND

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

[0003] However, most yield-type metal energy dissipation and shock absorption components are designed to be elastic under small earthquakes, and only play a role in energy dissipation under medium earthquakes and large earthquakes, and under frequent earthquakes, the structural deformation is small, and the component may not yield or enter a weak nonlinear state, the energy dissipation efficiency is low, the economy is poor, and the component cannot adapt to different intensity earthquakes. However, the hysteresis curve of the friction damper is approximately rectangular, and the energy dissipation efficiency is high under frequent earthquakes.

[0004] The friction damper converts friction caused by relative displacement between metal materials and friction materials into heat energy dissipation to dissipate the energy of seismic vibration and reduce the vibration response of the structure, but as the intensity of the earthquake increases, the sliding friction of the friction damper does not change, and the damping effect is not ideal. At present, the commonly used friction dampers in engineering all provide stiffness before sliding, and once the damper enters the sliding energy dissipation state, the stiffness will decrease or even tend to zero.

[0005] Therefore, it is necessary to research a metal composite friction damper. SUMMARY

[0006] Therefore, the purpose of the present application is to provide a metal composite friction damper, which effectively solves the problems of existing yield mechanism and energy dissipation limitation, insufficient stiffness and unsatisfactory damping effect.

[0007] To achieve the above object, the technical scheme adopted by the present application is: a metal composite friction damper, comprising a main plate, an outer connecting piece, a shearing assembly and a friction assembly, the friction assembly comprising a limiting 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 are fixed with the limiting plate on both sides of the two cover plates; the opposite surfaces of the upper cover plate and the lower cover plate are provided with the friction plate, and the friction gap is formed between the two friction plates; the limiting plate is provided with a through hole corresponding to the friction gap, and the main plate is sleeved with the friction gap through the through hole; the main plate is provided with a waist hole, and the upper cover plate and the lower cover plate are pulled by the fastening bolt through the waist hole so that the friction plate is tightly attached to the surface of the main plate; the shearing assembly comprises an upper shearing piece, a lower shearing piece, a first push plate and a second push plate, the first push plate and the second push plate are respectively arranged on the main plate outside the limiting plate, the first push plate is slidingly sleeved on the main plate, the second push plate is fixedly sleeved on the main plate, and the upper and lower shearing pieces are arranged between the adjacent two push plates and are distributed on the upper and lower sides of the friction assembly; the upper and lower shearing pieces each comprise a first shearing plate, a second shearing plate and a shearing piece, a plurality of shearing pieces are fixed between the first shearing plate and the second shearing plate, the two shearing plates are correspondingly combined together, and a shearing energy dissipation area is formed in the middle part; one end of the first shearing plate and the second shearing plate is fixedly connected with the inner side wall of the first push plate and the second push plate respectively, and the other end of the two shearing plates is slidingly inserted into the two side push plates, so that the first shearing plate and the second shearing plate can move out of position when the main plate reciprocally slides under the action of external force.

[0008] Further, the main plate is also symmetrically fixed with a limiting seat, the adjacent limiting seats are clamped and fixed on the inner and outer sides of the second push plate, and the second push plate can move synchronously through the limiting seat when the main plate is subjected to the action force.

[0009] Further, the first shearing plate and the second shearing plate are of the same structure and are of L-shaped structure, the opposite side walls of the first shearing plate and the second shearing plate are uniformly provided with shearing grooves, each shearing piece is inserted into the shearing groove and is fixed by a bolt, so that a shearing energy dissipation area is formed in the middle part.

[0010] Further, the first shearing plate and the second shearing plate in the upper and lower shearing pieces between the first push plate and the second push plate are oppositely arranged.

[0011] Further, the side walls of the first push plate and the second push plate are provided with sliding holes, one end of the first shearing plate and the second shearing plate is fixedly connected with the inner side walls of the first push plate and the second push plate by a bolt, and the other end is slidingly inserted into the sliding hole of the corresponding side push plate.

[0012] Further, the friction assembly further comprises stainless steel sheets, the friction sheets are made of NAO material, the stainless steel sheets are fixed on the upper and lower surfaces of the main plate, the upper cover plate and the lower cover plate are fixed by the waist hole and the fastening bolt, so that the friction sheets are tightly attached to the stainless steel sheets on the surface of the main plate.

[0013] Further, the outer end of the outer connecting piece extends outward to form a connecting part, the opening end of the outer connecting piece is bent inward to form an inner clamping seat, and a strip-shaped inner clamping seat is also correspondingly extended on the side wall of the inner cavity, and the inner clamping seats around the connecting part form an assembly area.

[0014] Further, when the limiting plate is matched and clamped in the assembly area, the opposite side walls of the inner clamping seats on both sides are 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.

[0015] Further, a fixing seat is arranged in the inner cavity of the outer connecting piece between the inner clamping seat and the connecting part, the inner wall of the fixing seat is in contact with and fixed to the outer side wall of the first push plate, so that the first push plate is fixed to the outer connecting piece.

[0016] The beneficial effects of the above technical scheme are:

[0017] The metal composite friction damper realizes the assembly type combination of shear energy consumption of the low-yield-point steel shear plate and friction energy consumption of the friction sheet, 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 appears plastic in small strain and has high plastic deformation capacity, the yield strength deviation is small, the ductility is excellent, the low-cycle fatigue performance is superior, the low-yield-point steel can be recycled and reused, the cost is controlled to be the lowest, and the maintenance time and cost are greatly reduced.

[0018] The metal composite friction damper enhances the energy consumption capacity on the basis of the friction damper, and improves the energy consumption efficiency under frequent earthquakes on the basis of the metal damper. By arranging the upper and lower shear members, a certain stiffness can be provided by the steel shear sheet when the stiffness of the friction unit decreases, and the energy consumption effect of the damper can be further improved when the metal plate member yields, so that the damper realizes the stage-by-stage yielding and double-stage energy consumption effect.

[0019] Further, when the stiffness of the friction unit decreases, the steel shear sheet in the shear assembly provides a certain stiffness, and energy is consumed through plastic deformation of the shear sheet, at this time, the damper is in the first stage of yielding and energy consumption; when the metal plate member yields, the energy consumption state is entered, the energy consumption effect of the damper is further improved, and the second stage of yielding and energy consumption of the damper is realized; the hysteresis curve of the metal composite friction damper is three-line type, and the stage-by-stage yielding and double-stage energy consumption effect of the damper is realized.

[0020] The damper provided by the application can be assembled in the building during actual building construction to provide an assembled frictional shear energy dissipation support, as shown in Figure 10 , and can effectively solve the problem that the traditional buckling restrained brace has a large plastic deformation after an earthquake, is severely damaged and difficult to repair or has a high repair cost, cannot be used continuously, needs to be demolished, and seriously affects the post-earthquake recovery capability of the building.

[0021] The damping support structure provided by the application not only can provide the effect of seismic energy dissipation, but also can realize the double-stage energy dissipation effect, improve the energy dissipation efficiency, and is assembled in an assembled manner, the material is easy to obtain, the assembly is simple, and the construction is convenient. When building structure support construction is performed, the damper can be assembled in batches in a factory or assembled on site, has good applicability, can realize low damage or no damage of the structure member after an earthquake, can realize energy dissipation under different fortification level earthquake actions, has low maintenance cost, is high in cost performance, is helpful to promote the development of environmental protection functional structures and the realization of the target of ductile buildings, and has wide application prospects. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is an embodiment structure schematic diagram of the application;

[0023] Figure 2 is an embodiment structure schematic diagram of the friction assembly;

[0024] Figure 3 is a front view structure schematic diagram of the friction assembly;

[0025] Figure 4 is a front view structure schematic diagram of the shear assembly;

[0026] Figure 5 is an assembly structure schematic diagram of the shear piece;

[0027] Figure 6 is an embodiment structure schematic diagram of the outer connecting piece;

[0028] Figure 7 is a top view structure schematic diagram of the outer connecting piece;

[0029] Figure 8 is another embodiment structure schematic diagram of the shear piece;

[0030] Figure 9 is a shear deformation schematic diagram of the main plate under different stress states;

[0031] Figure 10 is a different assembly position schematic diagram of the application in a building structure.

[0032] Fig. 1 is a main plate, 2 is a shearing assembly, 3 is an outer connecting piece, 4 is a connecting part, 5 is a fixing seat, 6 is an inner clamping seat, 7 is an assembly area, 8 is a friction assembly, 9 is a limiting seat, 10 is an upper cover plate, 11 is a lower cover plate, 12 is a stainless steel sheet, 13 is a friction sheet, 14 is a waist hole, 15 is a fastening bolt, 16 is a clamping groove, 17 is a limiting plate, 18 is a rectangular groove, 19 is a friction gap, 20 is a through hole, 21 is a first push plate, 22 is a second push plate, 23 is an upper shearing piece, 24 is a lower shearing piece, 25 is a shearing sheet, 26 is a first shearing plate, 27 is a second shearing plate, 28 is a sliding hole, and 29 is a shearing groove. DETAILED DESCRIPTION

[0033] The application will be further described in detail below in combination with the drawings and specific embodiments:

[0034] Embodiment 1 aims to provide a metal composite friction damper, mainly used for weakening the influence of earthquakes on buildings and realizing the consumption of seismic energy. The metal damper and the friction damper are widely used energy absorbers in engineering, which are low in cost, easy to manufacture, and have advantages in stress performance. In view of the existing problems of the yield mechanism and energy consumption limitation, insufficient stiffness and unsatisfactory damping effect in the existing energy dissipation and shock absorption devices, the application provides a metal composite friction damper, which realizes the assembly combination of shearing energy consumption of the low yield point steel shearing plate and friction energy consumption of the friction sheet, enhances the energy consumption capacity of the friction damper on the basis of the friction damper, improves the energy consumption efficiency of the metal damper under frequent earthquakes on the basis of the metal damper, and realizes the phased yield and two-stage energy consumption effect of the damper.

[0035] As shown in Figures 1-7 , the metal composite friction damper provided by the embodiment comprises a main plate 1, an outer connecting piece 3, a shearing assembly 2 and a friction assembly 8, as shown in Figure 2 and 3 , the friction assembly 8 in the embodiment comprises a limiting plate 17, an upper cover plate 10, a lower cover plate 11, a fastening bolt 15 and a friction sheet 13; the limiting plate 17 in the embodiment has a rectangular structure, a through hole 20 is formed in the middle part, the main plate 1 is matched and sleeved in the through hole 20 of the two limiting plates 17, and when the main plate 1 is subjected to an acting force, it can reciprocate in the two limiting plates 17.

[0036] As shown in Figure 2As shown, the upper cover plate 10 and the lower cover plate 11 are vertically spaced and located between the left and right limiting plates 17, and the opposite surfaces of the limiting plates 17 on the upper and lower sides of the main plate 1 are correspondingly provided with clamping grooves 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 clamped in the corresponding clamping grooves 16. Further, the lower bottom surface of the upper cover plate 10 and the top surface of the lower cover plate 11 are respectively and uniformly provided with rectangular grooves 18, and the friction plates 13 are respectively fixedly installed in the corresponding rectangular grooves 18, and the outer ends extend out of the rectangular grooves 18, so that the friction gap 19 is formed between the upper and lower friction plates 13. Figure 3 As shown, the main plate 1 is sleeved in the friction gap 19 through the through hole 20 in the limiting plate 17, and in this embodiment, the stainless steel plates 12 are respectively fixed on the upper and lower surfaces of the main plate 1, and the waist holes 14 are symmetrically provided on the outer side of the main plate 1, wherein the fastening bolts 15 pass through the waist holes 14 to pull the upper cover plate 10 and the lower cover plate 11, so that the friction plates 13 are tightly attached to the stainless steel plates 12 on the surface of the main plate 1.

[0037] Therefore, when the main plate 1 slides left and right in the through hole 20 of the limiting plate 17, the stainless steel plates 12 on the main plate 1 can generate friction with the friction plates 13, and such arrangement can convert seismic energy into heat energy and dissipate it to the surrounding environment to reduce the vibration of the building structure.

[0038] In this embodiment, the intermediate friction plates 13 and the stainless steel plates 12 are used for energy dissipation by friction, and the friction plates 13 are 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 under various environments. At the same time, it has good wear resistance and can maintain good friction performance in long-term use, reducing the replacement frequency and maintenance cost, and the noise generated during friction is small, and it can also maintain stable friction performance at high temperature to improve reliability.

[0039] As shown, Figures 4-6 The shear assembly 2 is provided on the outer side of the friction assembly 8, and in this embodiment, the shear assembly 2 includes an upper shear 23, a lower shear 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 provided on the outer side of the main plate 1, and the first push plate 21 is slidably sleeved on the main plate 1, and the second push plate 22 is fixedly sleeved on the main plate 1. In the specific structure, the first push plate 21 and the second push plate 22 are respectively and correspondingly provided with rectangular holes in the middle portions, so that the two push plates are respectively and correspondingly inserted on the main plate 1 and are located on the outer sides of the left and right limiting plates 17.

[0040] As shown, Figure 4As shown, two limiting seats 9 are also fixedly installed on the main plate 1 (the limiting seats 9 are fixed on the main plate 1 by bolts), and the two limiting seats 9 are symmetrically arranged on the inner and outer sides of the second push plate 22 and are clamped to the inner and outer side walls of the push plate, so that the two limiting seats 9 can tightly hold the second push plate 22 on the main plate 1. When the main plate 1 reciprocatingly moves under force, the clamping action of the limiting seats 9 on the second push plate 22 can synchronously drive the second push plate 22 to move left and right with the main plate 1, and at this time, the first push plate 21 is fixed with the outer connecting piece 3 to form a fixed push plate, so that the main plate 1 reciprocatingly moves in the rectangular hole on the first push plate 21, and the position of the first push plate 21 is fixed.

[0041] Specifically, as shown in Figure 6 and Figure 7 In this embodiment, the outer connecting piece 3 has a U-shaped structure, the opening of which faces the direction of the second push plate 22, and the outer end portion extends outward to form a connecting portion 4 for connecting with the building main structure. The outer connecting piece 3 is arranged on the outer side of the limiting plate 17 and is fixedly connected with the second push plate 22. The inner cavity of the outer connecting piece 3 is provided with an assembly area 7, and the two limiting plates 17 are fixed in the assembly area 7.

[0042] In a specific implementation structure, the opening end portion of the outer connecting piece 3 is inwardly bent to form an inner clamping seat 6, and a strip-shaped inner clamping seat 6 is also correspondingly extended on the side wall of the inner cavity. The four surrounding inner clamping seats 6 together form the assembly area 7 of the outer connecting piece 3. When the limiting plate 17 on the main plate 1 is matched and clamped in the assembly area 7, the opposite side walls of the two inner clamping seats 6 respectively contact the outer side wall of the limiting plate 17, and the outer connecting piece 3 can be sleeved on the outer side of the limiting plate 17 through the pin shaft. In addition, a fixing seat 5 is also arranged in the inner cavity of the outer connecting piece 3 between the inner clamping seat 6 and the connecting portion 4. The inner wall of the fixing seat 5 contacts and fixes the outer side wall of the first push plate 21, so as to fix the first push plate 21 on the outer connecting piece 3.

[0043] In actual application, the connecting portion 4 of the outer connecting piece 3 is fixedly connected with the building structure, thereby providing a fixed basis for the second push plate 22, and at the same time, the friction assembly 8 is limited in the assembly area 7 inside the outer connecting piece 3 to form a friction energy dissipation system, thereby improving the energy dissipation efficiency under frequent earthquakes.

[0044] As shown in Figure 5 and 6As shown, the upper and lower shear members 24 in the embodiment are arranged between the first and second push plates 21 and 22 and distributed on the upper and lower sides of the friction assembly 8; each of the upper and lower shear members 24 includes a first shear plate 26, a second shear plate 27 and a shear piece 25, the first shear plate 26 and the second shear plate 27 are identical in structure and have an L-shaped structure, and the first shear plate 26 and the second shear plate 27 in the upper and lower shear members 24 between adjacent push plates are oppositely arranged. The plurality of shear pieces 25 are uniformly fixed between the first shear plate 26 and the second shear plate 27, and when the first shear plate 26 and the second shear plate 27 are fixedly connected with the push plates on both sides, the first and second shear plates are correspondingly combined at the head and tail ends, respectively, to form a hollow shear energy dissipation zone.

[0045] In a specific structure, shear grooves 29 are uniformly formed on the side walls of the first and second shear plates 26 and 27, and in the embodiment, the shear piece 25 has an X-shaped structure with the ends being wide and the middle part being inwardly tapered (in actual application, the structure of the shear piece can be adaptively designed and replaced), and 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 with the first and second shear plates 26 and 27 by bolts, so as to form a shear energy dissipation zone in the area of the shear piece 25, and the shear capacity is provided by the steel shear plate for energy dissipation, and the thickened area of the outer shear plate is used to prevent out-of-plane buckling caused by shear deformation.

[0046] As shown in Figure 5 , sliding holes 28 are formed on the side walls of the first and second push plates 21 and 22, one end of each of the first and second shear plates 26 and 27 is fixedly connected to the inner side wall of the first and second push plates 21 and 22 by bolts, and the other end is matched and inserted into the sliding hole 28 on the corresponding side push plate, so that when the main plate 1 reciprocally slides under the action of external force, the first and second shear plates 26 and 27 can move reversely and dislocate, so as to consume seismic energy through plastic deformation of the middle shear piece 25.

[0047] The working principle of the metal composite friction damper provided in the embodiment is as follows: as shown in Figure 10 , during construction of a building structure, the damper can be directly fixed and assembled with a main structure member to be damped to form a shear constraint support of the building, and the damper can provide the effect of seismic energy dissipation. The outer connecting member is a fixed end, and the main plate is a force sliding end, and when the main plate is subjected to tension due to an earthquake, the main plate moves away from the outer connecting member, as shown in Figure 5 and Figure 9Meanwhile, the second push plate is driven by the limiting seat on the main plate to move synchronously, and the stainless steel sheet on the main plate moves outward, at this time, the friction sheet between the limiting plates and the stainless steel sheet generates friction under the limitation of the outer connecting piece, meanwhile, the first shear plate and the second shear plate are offset, so that the shear sheet in the middle of the two is deformed and sheared; when the main plate is subjected to an inward thrust, the main plate moves towards the outer connecting piece, and at the same time, the second shear plate is reset under the driving of the second push plate, at this time, the stainless steel sheet on the main plate again generates sliding friction between the friction sheet, therefore, whether the main plate is subjected to a thrust or a pull, the shear direction of the low-yield-point steel shear plate always remains unchanged, and the shear capacity is provided by the steel shear sheet, and the energy is dissipated by the friction between the middle friction sheet and the stainless steel sheet, thereby reducing the possibility of out-of-plane buckling caused by uneven stress due to in-plane defects to a certain extent.

[0048] Specifically, since the shear direction of the shear sheet always remains unchanged when the shear sheet dissipates energy, the shear plate can continuously and effectively dissipate energy during the deformation process, avoiding poor energy transmission and invalid energy loss caused by frequent changes in the shear direction, thereby improving the overall energy dissipation efficiency of the damper and reducing energy loss.

[0049] Moreover, the low-yield-point steel has good ductility, and the fixed shear direction enables it to fully enter the plastic deformation stage, better plays the energy dissipation characteristics of the material, further improves the energy dissipation capacity of the damper, avoids performance fluctuations caused by changes in the shear direction, ensures the stability and reliability of the damper during the entire use process, and better meets the requirements of engineering structures on energy dissipation and shock absorption devices. In the stress process, in-plane defects may cause uneven stress, which may further cause out-of-plane buckling, but in the embodiment, the shear direction remains unchanged, so that the stress distribution of the shear plate is relatively uniform when it is stressed, 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.

[0050] The metal composite friction damper provided by the application realizes the combination of shear energy dissipation of the low-yield-point steel shear plate, friction energy dissipation of the friction sheet and assembly function, enhances the energy dissipation capacity of the friction damper on the basis of the friction damper, improves the energy dissipation efficiency of the metal damper under frequent earthquakes, and has wide material sources, simple structure, clear force transmission and low maintenance cost, has good energy dissipation characteristics and energy dissipation efficiency, fully utilizes structural components, improves the utilization rate of components, helps to promote the development of environmentally friendly functional structures and the realization of ductile buildings, and has a broad application prospect.

[0051] In embodiment 2, the mounting structure of the shear sheet is further described.

[0052] The structure of the shear sheet in the embodiment is as shown in Figure 8As shown, the shear piece with uniform waist holes is fixedly arranged between the first shear plate and the second shear plate, and the two ends of the shear piece are fixedly connected with the two shear plates respectively, so that the shear piece in the shear energy dissipation zone can be deformed when the shear plates are translated left and right under force. Figure 9 As shown, the B area is the shear energy dissipation zone, and the G area is the thickened area for preventing out-of-plane buckling caused by shear deformation, and the main plate and the outer connecting piece are fixedly connected with the structural members on both sides of the building main structure respectively, as shown in Figure 10 As shown, the outer connecting piece serves as a fixed end, and the main plate serves as a force driving end, so that when the shear plate is subjected to tension or compression, the shear plate can perform shear energy dissipation through the deformation of the shear piece, and can also perform energy dissipation through the sliding friction between the stainless steel piece and the friction piece on the main plate, so that the shear direction of the low-yield-point steel shear plate remains unchanged in the tension or compression state.

[0053] The above-mentioned embodiments of the present application do not constitute a limitation on the protection scope of the present application, and the basic concept of the present application is to enhance the energy dissipation capacity of the friction damper and improve the energy dissipation efficiency of the metal damper under frequent earthquakes. The steel shear piece can 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 two-stage energy dissipation effect of the damper. Any modification, equivalent replacement and improvement within the spirit and principles of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A metal composite friction damper, characterized by: The utility model provides a shear damping device, including main plate, outer connecting piece, shearing assembly and friction assembly, the friction assembly includes limiting plate, upper cover plate, lower cover plate, fastening bolt and friction sheet, upper cover plate and lower cover plate are spaced apart and are fixed with limiting plate on both sides of two cover plates, the opposite surface of upper cover plate and lower cover plate is provided with friction sheet, and the friction gap is formed between two friction sheets, limiting plate is provided with the through -hole corresponding with friction gap, and main plate is sleeved in friction gap through the through -hole, is provided with the waist hole on main plate, and fastening bolt is pulled to upper cover plate and lower cover plate through waist hole to make friction sheet adhere to the surface of main plate, the shearing assembly includes upper shear piece, lower shear piece, first push plate and second push plate, first push plate and second push plate are arranged on the main plate outside limiting plate respectively, and first push plate is slidably sleeved on the main plate, and second push plate is fixedly sleeved on the main plate, and upper shear piece and lower shear piece are arranged between two adjacent push plates and are distributed on the upper side and the lower side of friction assembly, limiting seat is also fixed on the main plate symmetrically, and adjacent limiting seats are clamped and fixed on the inner side and the outer side of second push plate, when the main plate is subjected to force, can drive second push plate synchronous movement through limiting seat, upper shear piece and lower shear piece all include first shear plate, second shear plate and shear piece respectively, first shear plate and second shear plate are same in structure and are all L type structure, and uniform shear groove is formed on the side wall of the opposite surface of first shear plate and second shear plate, and each shear piece is inserted in shear groove and is locked and fixed through bolt, thereby forming shear energy dissipation zone in the middle, and a plurality of shear pieces are fixed between first shear plate and second shear plate, make two shear plates corresponding combination together, and form shear energy dissipation zone in the middle, one end of first shear plate and second shear plate is fixedly connected with the inner side wall of first push plate and second push plate respectively, and the other end of two shear plates is slidably inserted on the two side push plates, when the main plate reciprocatingly slides under external force, can make first shear plate and second shear plate dislocation movement between them, the outer connecting piece is arranged on the outer side of limiting plate and is fixedly connected with first push plate, and the assembly area is arranged in the outer connecting piece, and both side limiting plates are fixed in the assembly area.

2. The metal composite friction damper of claim 1, wherein: The first shear plate and the second shear plate in the upper shear piece and the lower shear piece between the first push plate and the second push plate are oppositely arranged.

3. The metal composite friction damper of claim 2, wherein: The side wall of the first push plate and the second push plate is provided with a sliding hole, one end of the first shear plate and the second shear plate is fixedly connected with the inner side wall of the first push plate and the second push plate through a bolt, and the other end is slidably inserted into the sliding hole of the corresponding side push plate.

4. The metal composite friction damper of claim 1, wherein: The friction assembly further comprises a stainless steel sheet, the friction sheet is made of NAO material, the stainless steel sheet is fixed on the upper and lower surfaces of the main plate, and the fastening bolt pulls the upper cover plate and the lower cover plate through the waist hole to be fixed, so that the friction sheet is tightly attached to the stainless steel sheet on the surface of the main plate.

5. The metal composite friction damper of claim 1, wherein: The outer end of the outer connecting piece extends outward to form a connecting part, the opening end of the outer connecting piece is bent inward to form an inner clamping seat, and a strip-shaped inner clamping seat is also correspondingly extended on the inner cavity side wall, and the four surrounding inner clamping seats jointly form an assembly area.

6. The metal composite friction damper of claim 1, wherein: When the limiting plate is matched and clamped in the assembling area, the opposite side walls of the inner clamping seat on both sides are 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.

7. The metal composite friction damper of claim 5, wherein: The inner cavity of the outer connecting piece between the inner clamping seat and the connecting part is also provided with a fixing seat, the inner wall of the fixing seat is in contact with and fixed to the outer side wall of the first push plate, so that the first push plate is fixed on the outer connecting piece.

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