Negative stiffness metamaterial shock insulation support limiting device
Through the negative stiffness metamaterial seismic isolation support limiting device, the seismic energy is absorbed using the Twinkling effect of curved beams and inclined beams, solving the problem of failure of the seismic limiting device during earthquakes, and achieving safe protection and efficient energy absorption of the seismic isolation support.
Patent Information
- Application Number
- CN202510723459.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-30
- Publication Date
- 2025-08-01
AI Technical Summary
The existing seismic isolation support limiting devices are prone to failure when earthquakes are rare, resulting in structural instability and damage. Traditional materials are prone to fatigue or high-frequency vibrations during collisions, affecting structural safety.
The negative stiffness metamaterial seismic isolation support limiting device is used to manufacture the negative stiffness metamaterial unit, including curved beams and inclined beams, absorbs seismic energy, limits the horizontal displacement of the seismic isolation support, and absorbs energy using the Twinkling effect, and has multiple limit energy consumption functions.
Effectively limit the displacement of the earthquake isolation support, improve impact resistance and fracture toughness, extend service life, have good reset ability, strong applicability, low material cost, simple structure, and easy to mass production.
Smart Images
Figure CN120401686A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of seismic isolation and shock absorption, and specifically to a limiting device for a negative stiffness metamaterial seismic isolation bearing. Background Art
[0002] Seismic isolation technology is currently the most mature and effective seismic reduction control technology in the world, and has been widely applied in various building and bridge projects. However, when the structure encounters extremely rare or near-fault earthquakes, the seismic isolation layer is prone to large horizontal displacements, resulting in collisions between the upper structure and adjacent structures or surrounding retaining walls, leading to structural instability and failure. Therefore, it is necessary to provide limit protection for the seismic isolation layer, limit the horizontal displacement of the seismic isolation bearing within the range permitted by the code, and ensure the safety of the base-isolated structure under earthquakes with intensities exceeding the design intensity.
[0003] Commonly used limiting and protection devices can play a good role in limiting the displacement of the seismic isolation layer to a certain extent, but there are still many deficiencies. For example, viscous dampers are prone to oil leakage, affecting their service life; metal dampers are prone to fatigue and difficult to recover from deformation, and concrete or metal blocks will cause hard collisions, triggering high-frequency vibrations and significantly amplifying the dynamic response of the upper structure. These defects may cause the limiting device to fail during rare or extremely rare earthquakes, posing greater potential safety hazards to the structure.
[0004] Metamaterials are unconventional materials different from natural materials and traditional artificial materials with special microscopic structural forms. Metamaterials include electromagnetic metamaterials, optical metamaterials, acoustic metamaterials, and mechanical metamaterials, among which negative stiffness metamaterials belong to the category of mechanical metamaterials. The negative stiffness metamaterials manufactured by 3D printing technology have the characteristics of light weight, high strength, and negative stiffness, and have great advantages in terms of impact resistance and fracture toughness compared with the commonly used materials of rubber and steel limiting devices. Summary of the Invention
[0005] The purpose of the present invention is to provide a limiting device for a negative stiffness metamaterial seismic isolation bearing to solve the problems raised in the above background art, thereby controlling the horizontal displacement of the seismic isolation bearing within a safe range and ensuring the safety of the building structure.
[0006] To achieve the above purpose, the present invention provides the following technical solutions:
[0007] A limiting device for a negative stiffness metamaterial seismic isolation bearing includes an upper connecting plate, a negative stiffness metamaterial unit, an interlayer plate, and a lower connecting plate. The lower end of the upper connecting plate is fixedly connected to the negative stiffness metamaterial unit. The negative stiffness metamaterial unit is a three-dimensional structure, and its internal structure includes a plurality of curved beams arranged in a circular array. There are a plurality of circular array structures between the upper ring and the base, and each circular array structure includes a vertical support and an inclined beam. The interlayer plate is arranged between the negative stiffness metamaterial units.
[0008] As a further solution of the present invention: the upper connecting plate and the interlayer plate are fixedly connected to the negative stiffness metamaterial unit by high-strength bolts, and the base and the lower connecting plate are fixedly connected to the retaining wall by high-strength bolts.
[0009] As a further solution of the present invention: the frustum is made of a hard material by 3D printing technology, and the hard material is nylon, polylactic acid or acrylonitrile butadiene styrene.
[0010] As a further solution of the present invention: the curved beam is completed by an additive manufacturing process or an injection molding process using a soft material, and the soft material is polyurethane or soft glue.
[0011] As a further solution of the present invention: the upper ring, the vertical support, the inclined beam and the base can be integrally processed by a casting process, and the material is nylon or resin.
[0012] As a further solution of the present invention: the frustum, the curved beam and the upper ring are bonded together by glue bonding.
[0013] An initial distance d is preset between the limiting device and the seismic isolation structure. Under the action of an earthquake exceeding the fortification intensity, when the horizontal displacement of the seismic isolation bearing exceeds the preset initial distance d, the seismic isolation structure collides with the limiting and protecting device. At this time, the set limiting and protecting device begins to play a role. Through the deformation of the curved beam and the inclined beam, energy is dissipated and a force is generated to limit the horizontal displacement of the seismic isolation bearing and limit it within an allowable range.
[0014] Compared with the prior art, the present invention provides a limiting device for a negative stiffness metamaterial seismic isolation bearing, which has the following beneficial effects:
[0015] First, the present invention uses negative stiffness metamaterials to replace the rubber and steel materials of the traditional limiting device. When an earthquake occurs, the seismic isolation bearing collides with the limiting device, and the negative stiffness metamaterial unit can absorb a large amount of energy transmitted from the upper connecting plate. During the collision process, the limiting device exhibits negative stiffness characteristics, thereby protecting the collision contact surface. Further, by combining two negative stiffness periodic structures, the impact resistance, fracture toughness and energy absorption performance of the negative stiffness metamaterial unit are improved.
[0016] Second, when the structure encounters a rare or extremely rare earthquake, the seismic isolation bearing collides with the limiting device, and the curved beam and the inclined beam in the device are sequentially compressed and deformed to absorb energy, having multiple limiting and energy dissipation functions, so that the limiting device can fully play its role.
[0017] Third, the limiting device has a long service life, has good reset ability after an earthquake, and is easy to disassemble and replace.
[0018] IV. The present invention is modularly assembled, and the size of the limiting device can be adjusted according to construction needs, increasing the applicability of the present invention. Further, the present invention has a simple structure, low material cost, and clear functional division of each component, facilitating mass production and engineering applications. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic structural diagram of the present invention
[0020] Figure 2 It is a front view of the negative stiffness metamaterial unit structure of the present invention
[0021] Figure 3 It is a top view of the negative stiffness metamaterial unit structure of the present invention
[0022] Figure 4 It is a schematic structural diagram of the bending beam and inclined beam of the present invention
[0023] Figure 5 It is a schematic engineering application diagram of the negative stiffness metamaterial isolation bearing limiting device of the present invention
[0024] In the figure: 1. Upper connecting plate; 2. Negative stiffness metamaterial unit; 3. Interlayer plate; 4. Lower connecting plate; 5. Frustum; 6. Bending beam; 7. Upper ring; 8. Vertical support; 9. Inclined beam; 10. Base; 11. High-strength bolt; 12. Retaining wall; 13. Isolation bearing; 14. Pier; 15. Foundation. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but do not constitute a limitation to the present invention.
[0026] Embodiment 1
[0027] Please refer to Figures 1-5 The present invention provides a technical solution: a negative stiffness metamaterial isolation bearing limiting device, including an upper connecting plate (1), a negative stiffness metamaterial unit (2), an interlayer plate (3), and a lower connecting plate (4). The lower end of the upper connecting plate (1) is fixedly connected to the negative stiffness metamaterial unit (2). The negative stiffness metamaterial unit (2) includes a frustum (5), a bending beam (6), an upper ring (7), a vertical support (8), an inclined beam (9), and a base (10). The interlayer plate (3) is arranged between the negative stiffness metamaterial units (2). The negative stiffness metamaterial unit (2) is connected to the upper connecting plate (1) and the interlayer plate (3) through high-strength bolts (11). The lower connecting plate (4) is connected to the retaining wall (12) through high-strength bolts (11).
[0028] Specifically, each layer of the negative stiffness mechanism is composed of lattice negative stiffness metamaterial units (2) arranged horizontally. The internal structure of the negative stiffness metamaterial unit (2) includes 12 curved beams (6) arranged in a 30° circumferential array. The curved beam (6) has a variable cross-section with thicker sides and thinner middle. The length L1 of the curved beam (6) is 7.5 mm, the height H1 is 14 mm, the thickness t1 is 2 mm, and the thickness t2 is 1.3 mm. There are 6 structures arranged in a 60° circumferential array between the upper ring (7) and the base (10). Each circumferential array structure includes a vertical support (8) and an inclined beam (9). The vertical support (8) is a cuboid structure, and the length t3 of the vertical support (8) is 2.5 mm, and the thickness t4 is 5 mm. The inclined beam (9) has a rectangular uniform cross-section and is symmetrically distributed on both sides of the vertical support (8). The length L2 of the inclined beam (9) is 9 mm, the height H2 is 6.5 mm, and the thickness t3 is 1.25 mm. The frustum (5), the curved beam (6), and the upper ring (7) are bonded together using a fast-curing glue DELI-7174.
[0029] Specifically, by changing the parameters of L1-L2 and t1-t4 in the curved beam (6) and the inclined beam (9), the stiffness and load-bearing capacity of the negative stiffness metamaterial unit are further changed, thereby changing the deformation ability and energy absorption ability of the limiting device to meet various engineering requirements and increase the applicability of the present invention.
[0030] Specifically, an initial distance d is preset between the limiting device and the seismic isolation structure. When a rare or extremely rare earthquake occurs, the seismic isolation bearing generates a large displacement. When the horizontal displacement of the seismic isolation structure exceeds the preset initial distance d, the seismic isolation structure collides with the limiting device. At this time, the upper connecting plate (1) presses down on the negative stiffness metamaterial unit (2), and the curved beam (6) and the inclined beam (9) in the device are sequentially compressed and deformed to produce the Twinkling effect. The Twinkling effect is superior to the energy absorption mechanism of traditional materials, so a large amount of energy transmitted from the upper connecting plate can be absorbed, thereby improving the shock absorption and buffering performance of the limiting device.
[0031] Specifically, the curved beam (6) and the inclined beam (9) are in a monostable state when compressed. Therefore, after the earthquake, the curved beam (6) and the inclined beam (9) can return to the initial state.
[0032] Specifically, the frustum (5) can be made by 3D printing technology, and the materials are nylon, polylactic acid, or acrylonitrile butadiene styrene. The curved beam (6) can be completed by additive manufacturing process or injection molding process, and the materials are polyurethane or soft glue. The upper ring (7), the vertical support (8), the inclined beam (9), and the base (10) can be integrally processed by casting process, and the materials are nylon or resin.
[0033] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. The shape of the negative stiffness metamaterial isolation bearing limiting device is not limited to the form proposed herein, and other similar types of limiting devices also fall within the scope of protection of the present invention.
Claims
1. A negative stiffness metamaterial seismic isolation and limiting device, comprising an upper connecting plate (1), a negative stiffness metamaterial unit (2), an interlayer plate (3), and a lower connecting plate (4). The lower end of the upper connecting plate (1) is fixedly connected to the negative stiffness metamaterial unit (2). The internal structure of the negative stiffness metamaterial unit (2) includes a plurality of circumferentially arrayed bending beams (6). There are a plurality of circumferentially arrayed structures between the upper ring (7) and the base (10). Each of the circumferentially arrayed structures includes a vertical support (8) and an inclined beam (9). The interlayer plate (3) is arranged between the negative stiffness metamaterial units (2). The negative stiffness metamaterial units (2) are connected to the upper connecting plate (1) and the interlayer plate (3) by high-strength bolts (11). The lower connecting plate (4) is connected to the retaining wall (12) by high-strength bolts (11).
2. The negative stiffness metamaterial isolation and limit device according to claim 1, wherein: The negative stiffness metamaterial seismic isolation and limiting device is vertically stacked by single-layer negative stiffness mechanisms. Each layer of the negative stiffness mechanism is horizontally arranged by lattice negative stiffness metamaterial units (2). The negative stiffness metamaterial unit (2) is a three-dimensional structure and is composed of a hard material body and a soft material body.
3. The negative stiffness metamaterial isolation and limit device according to claim 1, characterized in that: The frustum (5) is made of a hard material by 3D printing technology. The hard material is nylon, polylactic acid or acrylonitrile butadiene styrene.
4. A negative stiffness metamaterial isolation and limit device according to claim 1, characterized in that: The bending beam (6) is completed by an additive manufacturing process or an injection molding process with a soft material. The soft material is polyurethane or soft glue.
5. A negative stiffness metamaterial isolation and limit device according to claim 1, characterized in that: The upper ring (7), the vertical support (8), the inclined beam (9) and the base (10) are integrally processed by the above-mentioned hard material through a casting process.
6. The negative stiffness metamaterial isolation and limit device according to claim 1, characterized in that: The frustum (5), the bending beam (6) and the upper ring (7) are bonded together by glue.
7. A negative stiffness metamaterial seismic isolation and limit device according to claim 1, characterized in that: Bolting holes are reserved on the surfaces of the upper connecting plate (1), the interlayer plate (3), the frustum (5); between the upper connecting plate (1), the interlayer plate (3) and the frustum (5); between the frustum (5), the interlayer plate (3) and the base (10); between the base (10), the lower connecting plate (4) and the retaining wall (12), and they are connected by high-strength bolts (11).