Multi-stage energy consumption replaceable metal damper with composite deformation metamaterial

Abstract

The invention discloses a multi-stage energy consumption replaceable metal damper with a composite deformation metamaterial, and relates to the technical field of anti-seismic structures, the multi-stage energy consumption replaceable metal damper comprises a connector and a novel tension expansion metamaterial with a composite deformation mechanism, and the progressive anti-seismic function of small-earthquake energy consumption, middle-earthquake limiting and large-earthquake protection is achieved through a graded yield mechanism. The building can be dynamically protected under different seismic intensities; the modular replaceable energy consumption core body design is adopted, and quick disassembly and replacement of damaged components are achieved through standardized connection nodes; meanwhile, a self-adaptive displacement compensation structure is combined, and the stability of the main body structure is maintained in the continuous energy consumption process; according to the device, the anti-seismic reliability of a building structure in the whole life cycle is remarkably improved, the later operation cost is reduced through the maintenance-friendly design, and all-around performance optimization from earthquake protection to daily maintenance is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of seismic structures, and specifically to a multi-stage energy-dissipating replaceable metal damper with composite deformation metamaterials. Background Art

[0002] According to statistics, in terms of the death of people, earthquakes are the deadliest among disasters such as floods, wildfires, and debris flows, and the building damage caused by earthquakes resulting in casualties accounts for a very high proportion of the total casualties; for China with a large number of high-rise buildings, the total number of high-rise buildings in use and the high-rise public buildings over 100 meters in height are very large, which not only reflects the process of urbanization in China, but also poses higher requirements for the seismic design of Chinese buildings; exploring and improving the seismic performance of building structures (residences, bridges) and minimizing the harm of earthquakes to people have become the main challenges faced by the current civil engineering and architecture field.

[0003] The seismic application of metal dampers in building structures mainly absorbs and dissipates seismic energy through their plastic deformation, effectively reducing the seismic response of the structure and enhancing the seismic performance of the building; they are usually installed at key positions such as beam-column joints, shear walls, or bracing systems, and can significantly reduce structural deformation and damage; however, traditional metal dampers have some deficiencies, such as their performance may decline due to fatigue after long-term use, the seismic level is single and they may fail under high-intensity earthquakes, and it is difficult to replace them. Summary of the Invention

[0004] Therefore, to solve the above deficiencies, the present invention provides a multi-stage energy-dissipating replaceable metal damper with composite deformation metamaterials.

[0005] The present invention is implemented as follows. A multi-stage energy-dissipating replaceable metal damper with composite deformation metamaterials is constructed, and the device includes a joint and a novel auxetic metamaterial with a composite deformation mechanism.

[0006] Preferably, the joint is a 3D printed one-piece forming structure, one end is a round head U-shaped opening bolted to the building, and the other end is a square block T-shaped groove connected to the auxetic metamaterial energy dissipation structure; the novel auxetic metamaterial is integrally formed by 3D printing, and the material is a shape memory alloy.

[0007] Preferably, the round head U-shaped opening and the square block T-shaped groove on both sides of the joint are transitioned by lofting.

[0008] Preferably, the connection form between the joint and the novel auxetic metamaterial is a T-shaped connection; an auxiliary pin is also provided at the connection between the joint and the novel auxetic metamaterial for fixation.

[0009] Preferably, fluorescent microcapsules or conductive coatings are embedded in the novel auxetic metamaterial, and the color automatically changes or the resistance suddenly changes when the deformation exceeds the limit.

[0010] Preferably, the volume unit of the novel auxetic metamaterial is composed of an inwardly concave hexagonal structure and a chiral structure, and the chiral structure is integrated into the inner void of the inwardly concave hexagonal structure.

[0011] Preferably, the middle of the inwardly concave hexagonal structure of the volume unit of the novel auxetic metamaterial is designed with an arc structure to reduce stress concentration and improve the structural strength.

[0012] Preferably, chiral structures with different structures are integrated according to the energy dissipation level in the void of the inwardly concave hexagonal structure of the volume unit of the novel auxetic metamaterial, specifically including two-chiral structure, four-chiral structure and six-chiral structure.

[0013] Preferably, the two-chiral structure, four-chiral structure and six-chiral structure of the novel auxetic metamaterial are arranged symmetrically and periodically from the middle to both sides, with two units as a group and symmetrically distributed up, down, left and right.

[0014] Preferably, the novel auxetic metamaterial units are connected by a two-chiral structure, and the chiral pitch diameter increases from the middle to both sides, forming a gradient.

[0015] The present invention has the following advantages: The present invention provides a multi-stage energy-dissipating replaceable metal damper with composite deformation metamaterials through improvement. Compared with the same type of equipment, the following improvements are made:

[0016] The multi-stage energy-dissipating replaceable metal damper with composite deformation metamaterials of the present invention realizes the progressive seismic resistance functions of energy dissipation in minor earthquakes, displacement limitation in moderate earthquakes, and protection in major earthquakes through a hierarchical yield mechanism, ensuring that buildings can obtain dynamic protection under different seismic intensities; adopts a modular replaceable energy-dissipating core design, and realizes the rapid disassembly and replacement of damaged components through standardized connection nodes; at the same time, combines an adaptive displacement compensation structure to maintain the stability of the main structure during continuous energy dissipation; this device not only significantly improves the seismic reliability of building structures throughout the life cycle, but also reduces the later operation cost through a maintenance-friendly design, realizing the overall performance optimization from earthquake protection during the earthquake to daily maintenance. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is a schematic axonometric structural diagram of the joint and the novel auxetic metamaterial of the present invention;

[0019] Figure 3 is a schematic front view structural diagram of the joint and the novel auxetic metamaterial of the present invention;

[0020] Figure 4It is a schematic side view structure diagram of the joint and the novel auxetic metamaterial of the present invention;

[0021] Figure 5 It is a schematic axonometric view structure diagram of the joint of the present invention;

[0022] Figure 6 It is a schematic front view structure diagram of the novel auxetic metamaterial of the present invention;

[0023] Figure 7 It is a schematic axonometric view structure diagram of the novel auxetic metamaterial of the present invention.

[0024] Wherein: joint - 1, novel auxetic metamaterial - 2. Detailed implementation manners

[0025] The following combines the attached Figures 1 to 7 The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. In the following paragraphs, the present invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use non-precise scales, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0026] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. The embodiments of the present invention are described below according to its overall structure.

[0028] Please refer to Figures 1 to 7, a multi-stage energy-dissipating and replaceable metal damper with composite deformation metamaterials of the present invention. The structure formed by joint 1 and the novel auxetic metamaterial 2 can be applied to reduce the seismic response of structures and improve the seismic performance of buildings. The metal damper includes a joint and a novel auxetic metamaterial with a composite deformation mechanism;

[0029] Joint 1 is an integral structure. One end has a round-headed U-shaped opening connected to the building, and the other end has a square T-shaped groove connected to the auxetic material energy-dissipating structure, with a transition in the middle by lofting. This joint design realizes the interconnection between the energy-dissipating material and the building. The joint has high stiffness and strength, a high degree of load distribution, and excellent force transmission performance. The T-shaped groove design of the joint is used to quickly and simply replace the energy-dissipating component;

[0030] The novel auxetic metamaterial 2 is a negative Poisson's ratio structure with a composite deformation mechanism. During the energy-dissipating process, it is mainly carried out by two mechanisms: concave deformation and rotational deformation. The concave deformation is provided by the concave hexagonal structure, and the middle of the concave hexagonal structure is designed as an arc structure. The rotational deformation is provided by different chiral structures. The chiral structures are integrated into the voids within the concave structure, and different chiral structures form different stages of energy-dissipating structures. Among them, the two-chiral structure is a low-level energy-dissipating structure, the four-chiral structure is a medium-level energy-dissipating structure, and the six-chiral structure is a high-energy-dissipating structure. When seismic waves are transmitted to the auxetic material energy-dissipating component, first, the two-chiral concave structure deforms first. As the seismic waves increase, the four-chiral concave structure and the six-chiral concave structure enter the energy-dissipating state in sequence. The multi-stage energy-dissipating mechanism helps the metal damper to dissipate energy efficiently in small, medium, and large earthquakes;

[0031] The novel auxetic metamaterial 2 with a composite deformation mechanism is arranged in a unit-symmetric period. It consists of two units as a group, symmetrically distributed up, down, left, and right, thus forming the novel auxetic metamaterial 2 with a composite deformation mechanism;

[0032] Similarly, the connections between adjacent units are also correspondingly configured with two-chiral structures of different diameters to enhance the multi-stage energy-dissipating effect in sequence.

[0033] Based on the above, the working principle of a multi-stage energy-dissipating and replaceable metal damper with composite deformation metamaterials is as follows:

[0034] Through composite deformation design (such as the negative Poisson's ratio deformation of the auxetic material, the plastic yield of the metal core, and friction energy dissipation), dynamic adaptability: The auxetic material absorbs energy through elastic expansion during small earthquakes, deforms synergistically with the metal core during medium earthquakes, and triggers multi-stage energy-dissipating paths during large earthquakes, avoiding the "all or nothing" failure mode of traditional dampers, and realizing multi-stage responses in small earthquakes (elastic stage), medium earthquakes (local yield), and large earthquakes (full cross-section energy dissipation), adapting to different seismic intensity requirements;

[0035] The negative Poisson's ratio structure expands laterally when under tension, increasing the contact area with the surrounding structures and dissipating energy through friction; when under compression, it contracts and densifies, combined with the plastic deformation of the metal core, forming a "expansion - contraction - yielding" composite energy dissipation path, with the energy absorption efficiency increased by more than 40%; the self - strengthening property of the auxetic metamaterial can inhibit the buckling instability of the metal core under high - cycle earthquakes and extend the service life; the vulnerable metal core and the auxetic metamaterial shell are designed as detachable modules. After an earthquake, only local energy - dissipating components (such as shear energy - dissipating plates, friction pads) need to be replaced, without the need for overall demolition, and the maintenance cost is reduced by 60%; using standardized interfaces and pre - tightened bolts for connection, the damaged module can be replaced within 48 hours, greatly shortening the time for restoring the building function;

[0036] The combination of the lightweight porous structure of the auxetic metamaterial (with a density of 1 / 3 of steel) and the high strength of the metal core reduces the weight by 50% compared with traditional viscous dampers under the same energy - dissipating capacity, and is suitable for the reinforcement of existing buildings with limited space; the shape of the auxetic unit can be customized by 3D printing to adapt to various installation scenarios such as beam - column joints and shear walls; fluorescent micro - capsules or conductive coatings are embedded in the auxetic metamaterial, which can automatically change color or the resistance mutates when the deformation exceeds the limit, realizing the visual monitoring of damage; the metal core uses low - carbon alloy materials, and the auxetic structure can be recycled and remanufactured, with the carbon emissions in the whole life cycle reduced by 35% compared with traditional dampers.

[0037] Through improvement, the present invention provides a multi - stage energy - dissipating and replaceable metal damper with composite deformation metamaterials, which realizes the progressive seismic - resistant functions of energy dissipation in minor earthquakes, displacement limitation in moderate earthquakes, and protection in major earthquakes through a hierarchical yielding mechanism, ensuring that the building can obtain dynamic protection under different seismic intensities; adopting a modular replaceable energy - dissipating core design, the damaged components can be quickly disassembled and replaced through standardized connection nodes; at the same time, combined with an adaptive displacement compensation structure, the stability of the main structure is maintained during the continuous energy - dissipation process; this device not only significantly improves the seismic reliability of the building structure in the whole life cycle, but also reduces the later operation cost through a maintenance - friendly design, realizing the all - round performance optimization from earthquake protection to daily maintenance.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. The standard parts used in the present invention can all be purchased from the market. The special - shaped parts can be customized according to the records of the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, welding, etc. that are mature in the prior art. The machines, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here.

[0039] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-stage energy-dissipating replaceable metal damper with a composite deformation metamaterial, comprising a joint (1) and a novel traction metamaterial (2) with a composite deformation mechanism.

2. According to claim 1, a multi-stage energy dissipation replaceable metal damper with composite deformable metamaterial, characterized in that: The joint (1) is a 3D printed one-piece structure, with a round U-shaped opening at one end connected to a building bolt, and a square T-shaped slot at the other end connected to a tensile metamaterial energy dissipation structure; the novel tensile metamaterial (2) is formed in one piece by 3D printing, and the material is a memory alloy.

3. According to claim 2, a multi-stage energy dissipation replaceable metal damper with composite deformable metamaterial, characterized in that: The round U-shaped openings on both sides of the joint (1) are laid out in transition with the square T-shaped grooves.

4. According to claim 3, a multi-stage energy dissipation replaceable metal damper with composite deformable metamaterial, characterized in that: The connection form between the joint (1) and the novel auxetic metamaterial (2) is a T-shaped connection; an auxiliary pin is also provided at the connection between the joint (1) and the novel auxetic metamaterial (2) for fixing.

5. According to claim 4, a multi-stage energy dissipation replaceable metal damper with composite deformable metamaterial, characterized in that: The novel traction metamaterial (2) has fluorescent microcapsules or conductive coatings embedded therein, which automatically change color or resistance when the deformation exceeds a limit.

6. According to claim 5, a multi-stage energy dissipation replaceable metal damper with composite deformable metamaterial, characterized in that: The volume unit of the novel auxetic metamaterial (2) consists of a concave hexagonal structure and a chiral structure, and the chiral structure is integrated in the inner gap of the concave hexagonal structure.

7. The multi-stage energy dissipation replaceable metal damper with composite deformable metamaterial according to claim 6, characterized in that: The concave hexagonal structure of the volume unit of the novel traction metamaterial (2) is designed with an arc structure in the middle, thereby reducing stress concentration and improving structural strength.

8. The multi-stage energy dissipation replaceable metal damper with composite deformable metamaterial according to claim 7, characterized in that: The volume unit of the novel auxetic metamaterial (2) is composed of a void in a concave hexagonal structure, in which chiral structures of different structures are integrated according to the energy dissipation level, specifically a two-handed structure, a four-handed structure and a six-handed structure.

9. The multi-stage energy dissipation replaceable metal damper with composite deformable metamaterial according to claim 8, characterized in that: The two-handed structure, four-handed structure and six-handed structure of the novel auxetic metamaterial (2) are arranged periodically and symmetrically from the middle to the two sides, and are composed of two units as a group, which are symmetrically distributed up and down and left and right.

10. The multi-stage energy dissipation replaceable metal damper with composite deformable metamaterial according to claim 9, characterized in that: The units of the novel traction metamaterial (2) are connected by a two-handed chiral structure, and the diameter of the chiral pitch circle increases from the middle to both sides to form a gradient.

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