A displacement-amplified composite friction damper

Abstract

This utility model discloses a displacement-amplified composite friction damper. The upper connecting plate has three sets of equidistant axial connecting ends at its bottom; three sets of equidistant extension plates are located above the core plate, and friction shear components are installed on both sides of the core plate; a lever plate is installed between the axial connecting ends and the extension plates; connecting shafts pass through the axial connecting ends and the extension plates respectively to reinforce the installation of the lever plate; large side plates are fixed at both ends of the lower connecting plate, and the large side plates are tightly fitted to the core plate through the friction shear components. After being amplified by the lever plate, the relative displacement between the upper and lower connecting plates will be greater than the displacement generated by the original building structure. In the small displacement stage: the vulcanized rubber layer absorbs energy through elastic deformation, and the friction plates and steel plates remain relatively stationary, achieving low-frequency vibration isolation. In the large displacement stage: when the vulcanized rubber layer reaches its deformation limit, the steel plate and friction plates begin to slide and rub, significantly improving energy consumption efficiency and adapting to extreme conditions such as earthquakes. The overall structure is simple and easy to install.

Description

Technical Field

[0001] This utility model belongs to the field of damper technology, specifically relating to a displacement-amplified composite friction damper. Background Technology

[0002] In the field of seismic resistance and vibration control of building structures, dampers, as an important energy-dissipating and vibration-reducing device, can effectively absorb and dissipate the energy input by dynamic loads such as earthquakes or wind vibrations, thereby reducing structural vibration response and improving building safety and comfort. Traditional dampers mainly include viscous dampers, metal yield dampers, and friction dampers.

[0003] Traditional dampers suffer from the following problems: 1. Insufficient adaptability to small displacement conditions: Ordinary friction dampers require a certain displacement threshold to activate frictional energy dissipation, resulting in low energy dissipation efficiency under wind-induced vibration or minor earthquakes, making it difficult to effectively control the micro-amplitude vibrations of the structure; 2. Single energy dissipation mechanism: Existing friction dampers typically rely solely on sliding friction for energy dissipation, lacking the ability to work collaboratively across multiple stages and mechanisms, and thus failing to adapt to the differentiated needs under earthquakes of varying intensities; 3. Urgent need for displacement amplification: For building structures with small inter-story displacements, traditional dampers often fail to fully realize their energy dissipation potential due to insufficient relative displacement, necessitating an effective displacement amplification mechanism; 4. Some composite dampers have complex structures, making on-site installation difficult. Utility Model Content

[0004] The purpose of this invention is to provide a displacement-amplified composite friction damper to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A displacement-amplified composite friction damper includes an upper connecting plate with three sets of equidistant axial connecting ends at its bottom; a core plate with three sets of equidistant extension plates above it, and friction shear assemblies installed on both sides of the core plate; a lever plate installed between the axial connecting ends and the extension plates; a connecting shaft passing through the axial connecting ends and the extension plates to reinforce the installation of the lever plate; a lower connecting plate with large side plates fixed at both ends, the large side plates being tightly fitted to the core plate via the friction shear assemblies; a pin passing through the lever plate and the large side plates as a lever fulcrum; and a bolt assembly passing through the large side plates, the friction shear assemblies, and the core plate, used to tightly fit the friction coefficients between the large side plates, the friction shear assemblies, and the core plate.

[0007] Preferably, the top of the upper connecting plate and the bottom of the lower connecting plate are welded with embedded parts pre-embedded in the building.

[0008] Preferably, the center distance between the pin and the upper connecting shaft is smaller than the center distance between the pin and the lower connecting shaft.

[0009] Preferably, the core board surface has equally spaced holes and slots equal to the number of bolt assemblies.

[0010] Preferably, the diameter of the hole is much larger than the diameter of the bolt assembly.

[0011] Preferably, the friction shear assembly includes a friction plate, a steel plate, and a vulcanized rubber layer. The friction plate is tightly fitted onto the surface of the core plate, the steel plate is tightly fitted onto the friction plate, and the steel plate is located between the friction plate and the vulcanized rubber layer.

[0012] Preferably, the steel plate is integrally formed with the large side plate through a vulcanized rubber layer.

[0013] The technical solution of this utility model has the following beneficial effects:

[0014] 1. After being amplified by the lever plate, the relative displacement between the upper and lower connecting plates will be greater than the displacement generated by the original building structure. In the small displacement stage: the vulcanized rubber layer absorbs energy through elastic deformation, and the friction plate remains relatively stationary with the steel plate, achieving low-frequency vibration isolation. In the large displacement stage: when the vulcanized rubber layer reaches its deformation limit, the steel plate and friction plate begin to slide and rub, significantly improving energy consumption efficiency and adapting to extreme conditions such as earthquakes. The overall structure is simple and easy to install. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0018] Figure 3 This is a three-dimensional cross-sectional view of the present invention.

[0019] Figure 4 This is a plan perspective view of the present invention.

[0020] Figure 5 This is a planar sectional view of the present invention.

[0021] Reference numerals: 10, upper connecting plate; 20, shaft connecting end; 201, lever plate; 30, connecting shaft; 40, through pin; 50, large side plate; 501, lower connecting plate; 60, core plate; 601, extension plate; 602, slot; 70, friction plate; 80, steel plate; 90, vulcanized rubber layer; 100, bolt assembly. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0023] Example 1:

[0024] refer to Figures 1-5 A displacement-amplified composite friction damper, comprising

[0025] Upper connecting plate 10: The bottom of the upper connecting plate 10 has three sets of axial connecting ends 20 at equal intervals; Core plate 60: The core plate 60 has three sets of extension plates 601 at equal intervals above it, and friction shearing components are installed on both sides of the core plate 60; Lever plate 201: The lever plate 201 is installed between the axial connecting ends 20 and the extension plates 601; Connecting shaft 30: The connecting shaft 30 passes through the axial connecting ends 20 and the extension plates 601 respectively to reinforce the installation of the lever plate 201; Lower connecting plate 501: The lower connecting plate 501 has large side plates 50 fixed at both ends, and the large side plates 50 are tightly fitted to the core plate 60 through the friction shearing components; Through pin 40: The through pin 40 passes through the lever plate 201 and the large side plate 50 as a lever fulcrum; Bolt assembly 100: The bolt assembly 100 passes through the large side plate 50, the friction shearing components, and the core plate 60, and the bolt assembly 100 is used to tightly fit the friction coefficient between the large side plate 50, the friction shearing components, and the core plate 60.

[0026] In the above scheme, the top of the upper connecting plate 10 and the bottom of the lower connecting plate 501 are welded with embedded parts that are embedded in the building. The upper connecting plate 10 and the lower connecting plate 501 are directly connected to the building by welding with the embedded parts.

[0027] During an earthquake, the lever plate 201 amplifies the relative displacement between the upper connecting plate 10 and the lower connecting plate 501: When an earthquake occurs, the building structure shakes, causing relative movement between the upper connecting plate 10 and the lower connecting plate 501 of the damper. This damper utilizes the lever principle to amplify this relative displacement. This means that under the same seismic action, after being amplified by the lever plate 201, the relative displacement between the upper connecting plate 10 and the lower connecting plate 501 will be greater than the displacement originally generated by the building structure.

[0028] Because the relative displacement between the upper connecting plate 10 and the lower connecting plate 501 is amplified, the shearing force on the friction shear assembly is enhanced, and the shear displacement of the friction shear assembly increases accordingly. At the same time, under a larger displacement, the core plate 60 is more likely to reach the slip condition, and its slip displacement also increases accordingly. When the shear displacement of the friction shear assembly and the slip displacement of the core plate 60 increase, the range of force and displacement changes in the damper during reciprocating motion is larger, and the area enclosed by the hysteresis curve also increases (the hysteresis curve is a curve describing the relationship between force and displacement of the damper under reciprocating load. The envelope area reflects the energy consumed by the damper in one cycle).

[0029] Increased energy consumption of the damper: The increase in the envelope area of ​​the hysteresis curve directly means that the damper consumes more energy in one cycle. Since the main function of the damper is to dissipate the energy input into the building structure by earthquake through its own deformation and friction, the increased energy consumption indicates that the damper can absorb and dissipate more energy during an earthquake.

[0030] More effective building protection: Because dampers absorb more seismic energy, the energy transmitted to the main building structure is significantly reduced. This reduces the seismic forces acting on the building structure, consequently decreasing deformation and damage, thus more effectively protecting the building and improving its safety and reliability during earthquakes.

[0031] Preferred Solution Reference Figure 2 The center distance between the pin 40 and the upper connecting shaft 30 is less than the center distance between the pin 40 and the lower connecting shaft 30.

[0032] In this preferred embodiment, the lever arm between the pin 40 and the upper connecting shaft 30 is small (L1), and the lever arm between the pin 40 and the lower connecting shaft 30 is large (L2). This makes the upper connecting plate 10 require greater displacement force, and similarly, the core plate 60 requires less relative displacement force.

[0033] Preferably, the core plate 60 has equally spaced holes and slots 602 on its surface, the same number as the bolt assembly 100. The diameter of the holes and slots 602 is much larger than the diameter of the bolt assembly 100.

[0034] In this preferred embodiment, the diameter of the slot 602 is much larger than the diameter of the bolt assembly 100, which ensures that the core plate 60 has sufficient sliding distance when it starts to slide; at the same time, the large diameter can improve the heat dissipation effect.

[0035] Further reference Figure 2 , Figure 3 and Figure 5The friction shear assembly includes a friction plate 70, a steel plate 80, and a vulcanized rubber layer 90. The friction plate 70 is tightly fitted onto the surface of the core plate 60, and the steel plate 80 is tightly fitted onto the friction plate 70, with the steel plate 80 positioned between the friction plate 70 and the vulcanized rubber layer 90. The steel plate 80 is integrally formed with the large side plate 50 via the vulcanized rubber layer 90.

[0036] In a further embodiment, when the relative displacement between the upper connecting plate 10 and the lower connecting plate 501 is amplified, the shear force on the vulcanized rubber layer 90 is enhanced, and the shear displacement of the vulcanized rubber layer 90 increases accordingly. The friction plate 70 is tightly fitted to the surface of the core plate 60. When an earthquake or vibration causes relative displacement between the core plate 60 and the steel plate 80 (or the vulcanized rubber layer 90), sliding friction occurs between the friction plate 70 and the contact surface (steel plate 80 or core plate 60), converting mechanical energy into heat energy and dissipating it. The surface of the friction plate 70 is treated with sandblasting, coating, or fiber reinforcement to improve wear resistance and high-temperature resistance, preventing the coefficient of friction from decreasing after long-term use. The steel plate 80, as a rigid component, provides a stable support platform for the friction plate 70, ensuring uniform deformation under stress and preventing premature failure due to localized stress concentration. The steel plate 80 transmits the elastic force of the vulcanized rubber layer 90 to the friction plate 70, while simultaneously feeding back the reaction force of the friction plate 70 to the vulcanized rubber layer 90, forming an "elastic-friction" coupled energy dissipation mechanism. Multi-stage energy dissipation: In small-amplitude vibrations, the vulcanized rubber layer 90 dissipates energy through elastic deformation; in large-amplitude vibrations, the relative sliding between the steel plate 80 and the friction plate 70 triggers frictional energy dissipation, achieving full-frequency vibration control. The vulcanized rubber layer 90, located outside the steel plate 80, absorbs initial vibration energy through its high elasticity, reducing the direct impact on the friction plate 70 and extending its lifespan.

[0037] In summary, during the small displacement stage: the vulcanized rubber layer 90 absorbs energy through elastic deformation, while the friction plate 70 and the steel plate 80 remain relatively stationary, achieving low-frequency vibration isolation. During the large displacement stage: when the deformation of the vulcanized rubber layer 90 reaches its limit, the steel plate 80 and the friction plate 70 begin to slide and rub against each other, significantly improving energy consumption efficiency and adapting to extreme conditions such as earthquakes. The overall structure is simple and easy to install.

[0038] The above embodiments are merely exemplary models of this utility model and are not intended to limit this utility model. The scope of protection of this utility model is defined by the claims. Various modifications or equivalent substitutions can be made to this utility model within its substance and scope of protection. Such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this utility model.

[0039] In the description of this utility model, it should be noted that the terms "inner," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the attached circle, or the orientation or positional relationship commonly used when the utility model product is in use. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, these terms indicating orientation or positional relationship should not be construed as limitations on this utility model.

[0040] In the description of this utility model, it should be further noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, these terms can refer to a fixed connection, a detachable connection, or an integral connection between components; they can also refer to a mechanical connection or an electrical connection; or they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

Claims

1. A displacement-amplified composite friction damper, characterized in that: include Upper connecting plate (10): The bottom of the upper connecting plate (10) has three sets of axial connecting ends (20) at equal intervals; Core plate (60): There are three sets of extension plates (601) equidistantly spaced above the core plate (60), and friction shearing components are installed on both sides of the core plate (60); Lever plate (201): The lever plate (201) is installed between the shaft connection end (20) and the extension plate (601); Connecting shaft (30): The connecting shaft (30) passes through the shaft connecting end (20) and the extension plate (601) respectively to reinforce the installation of the lever plate (201); Lower connecting plate (501): The lower connecting plate (501) has large side plates (50) fixed at both ends, and the large side plates (50) are tightly fitted to the core plate (60) through a friction shear assembly; Pin (40): Pin (40) passes through lever plate (201) and large side plate (50) as lever fulcrum; Bolt assembly (100): Bolt assembly (100) passes through large side plate (50), friction shear assembly, and core plate (60). Bolt assembly (100) is used to tightly fit the friction coefficient between large side plate (50), friction shear assembly, and core plate (60).

2. The displacement-amplified composite friction damper according to claim 1, characterized in that: The top of the upper connecting plate (10) and the bottom of the lower connecting plate (501) are welded with embedded parts pre-embedded in the building.

3. The displacement-amplified composite friction damper according to claim 1, characterized in that: The center distance between the pin (40) and the upper connecting shaft (30) is less than the center distance between the pin (40) and the lower connecting shaft (30).

4. The displacement-amplified composite friction damper according to claim 1, characterized in that: The core plate (60) has equally spaced holes (602) on its surface, the same number as the bolt assembly (100).

5. A displacement-amplified composite friction damper according to claim 4, characterized in that: The diameter of the slot (602) is much larger than the diameter of the bolt assembly (100).

6. The displacement-amplified composite friction damper according to claim 5, characterized in that: The friction shear assembly includes a friction plate (70), a steel plate (80), and a vulcanized rubber layer (90). The friction plate (70) is tightly fitted on the surface of the core plate (60), and the steel plate (80) is tightly fitted with the friction plate (70). The steel plate (80) is located between the friction plate (70) and the vulcanized rubber layer (90).

7. A displacement-amplified composite friction damper according to claim 6, characterized in that: The steel plate (80) is integrally formed with the large side plate (50) through a vulcanized rubber layer (90).

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