A curved ultra-damping vibration isolation device with low broadband bandgap characteristics

Abstract

The present invention relates to an arc-shaped super-damping vibration isolation device with low broadband bandgap characteristics; based on the high damping characteristics of viscoelastic materials and the design concept of local resonance type acoustic metamaterials, a mass block composed of steel columns is formed by wrapping concrete to play a bearing role inside, and an elastic matrix is ​​wrapped outside the mass block to connect with adjacent units, and the traditional square boundary is replaced by an arc-shaped boundary to reduce the contact area between adjacent cells. When seismic waves or other elastic waves come, the elastic matrix wraps the internal mass block to cause torsional deformation to open the band gap, isolate seismic waves of specific frequencies, and make it impossible for seismic waves to pass through, thereby achieving the effect of vibration isolation. The present invention has both bearing capacity and filtering capacity. When seismic waves or other elastic waves come, elastic waves in a specific range are isolated, thereby protecting buildings.

Description

Technical Field

[0001] The invention relates to an arc-shaped super-damping vibration isolation device with low broadband bandgap characteristics. Background Art

[0002] In the past, the main methods of earthquake resistance were traditional earthquake resistance, which was achieved by increasing the size of components and reinforcement; foundation isolation, which was achieved by extending the natural vibration period of the structure; and energy dissipation and shock absorption, which reduced the seismic energy input to the upper structure through the energy dissipation of the energy dissipator. However, the disadvantages of the three methods are also obvious. Traditional earthquake resistance is prone to collapse when encountering large vibrations; foundation isolation may overturn; and energy dissipation and shock absorption is limited by the relative acceleration and relative deformation of the structure itself, and the vibration reduction effect is limited. In recent years, a new type of periodic structural idea has emerged, which uses the band gap characteristics of phononic crystals to prevent elastic waves within a certain frequency range from passing through the structure. Existing periodic structures are divided into one-dimensional periodicity, two-dimensional periodicity, and three-dimensional periodicity. One-dimensional periodicity is arranged periodically in the z direction, opening the band gap to achieve a vibration isolation effect, but one-dimensional periodicity can only filter seismic waves transmitted in the z direction. Two-dimensional periodicity can filter seismic waves coming from x and y. When seismic waves come from z direction, they will not attenuate but will resonate and amplify. Three-dimensional periodicity can filter seismic waves in x, y and z directions. However, it is difficult for three-dimensional periodicity to achieve low-frequency wide band gap. Therefore, the filtering performance of seismic waves is not good. Based on this, the present invention is proposed. Summary of the invention

[0003] The purpose of the present invention is to improve the seismic performance of buildings. Based on the high damping characteristics of viscoelastic materials and the design concept of local resonance acoustic metamaterials, an arc-shaped super-damping vibration isolation device with low broadband bandgap characteristics is proposed.

[0004] The present invention relates to an arc-shaped super-damping vibration isolation device with low broadband bandgap characteristics. Based on the high damping characteristics of viscoelastic materials and the design concept of local resonance type acoustic metamaterials, a mass block composed of a steel column wrapped in concrete is used to play a bearing role inside, an elastic matrix is ​​wrapped outside the mass block to connect with adjacent units, and a traditional square boundary is replaced by an arc-shaped boundary to reduce the contact area between adjacent cells. When seismic waves or other elastic waves come, the elastic matrix wraps the internal mass block to cause torsional deformation to open the band gap, isolate seismic waves of specific frequencies, and make it impossible for seismic waves to pass through, thereby achieving the effect of vibration isolation. At the same time, the direction with filtering effect is named 0 degrees, and the direction with bearing capacity is 90 degrees. Through the 0°-90°-0° or 90°-0°-90° mode, it is arranged horizontally or vertically to form a new type of vibration isolation device with both bearing capacity and filtering capacity. The present invention is different from the previous periodic structure. One-dimensional and two-dimensional periodic structures cannot hinder seismic waves in other directions, and the existing three-dimensional periodic structure has poor vibration isolation performance and cannot cover extremely low-frequency seismic waves. A unit cell with a low broadband bandgap characteristic is designed, and a vibration isolation device is formed with the unit cell, which has both load-bearing capacity and filtering capacity. When earthquake waves or other elastic waves are transmitted, elastic waves within a specific range are isolated, thereby protecting the building. The present invention should not be limited to building vibration isolation, but can also be applied to vibration isolation in the fields of aerospace, ships, transportation, and automobiles.

[0005] The structure of the present invention also includes the following features:

[0006] The external elastic matrix replaces the traditional square boundary with an arc shape, thereby reducing the contact area between adjacent unit cells;

[0007] The mass blocks composed of internal concrete and steel columns are all rectangular, which ensures the bearing capacity of the structure in all directions;

[0008] It can open the first band gap of extremely low frequency of 2.47Hz-16.17Hz, which can cover most of the main frequency bands of earthquake motion;

[0009] The geometric dimensions of each part can be changed by calculation according to the requirements to obtain the required band gap range;

[0010] The mass block composed of concrete and steel columns has high rigidity, ensuring that the structure has sufficient bearing capacity;

[0011] The direction with filtering effect is named 0°, and the direction with carrying capacity is named 90°;

[0012] Arranged in 0°-90°-0° or 90°-0°-90° manner;

[0013] The arrangement direction is divided into horizontal or vertical arrangement;

[0014] The above material combinations are for reference only. You can choose appropriate materials according to your needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a unit cell of an arc-shaped super-damping vibration isolation device with low broadband bandgap characteristics of the present invention, 1 is an elastic matrix, 2 is concrete, and 3 is a steel column;

[0016] Figure 2 The unit cell plane diagram of the arc-shaped super-damping vibration isolation device with low broadband bandgap characteristics of the present invention

[0017] Figure 3 The band gap diagram of the unit cell of the arc-shaped super-damping vibration isolation device with low broadband band gap characteristics of the present invention is shown in FIG.

[0018] Figure 4 Schematic diagram of the horizontal 0°-90°-0° arrangement of the unit cell of the arc-shaped super-damping vibration isolation device with low broadband bandgap characteristics of the present invention

[0019] Figure 5 This is a horizontal 0°-90°-0° schematic diagram of the arc-shaped super-damping vibration isolation device with low broadband bandgap characteristics of the present invention, where 4 is a steel plate

[0020] Figure 6 Schematic diagram of the lateral 90°-0°-90° arrangement of the unit cell of the arc-shaped super-damping vibration isolation device with low broadband bandgap characteristics of the present invention

[0021] Figure 7 Schematic diagram of the arc-shaped super-damping vibration isolation device with low broadband bandgap characteristics of the present invention at a horizontal angle of 90°-0°-90°

[0022] Figure 8 Schematic diagram of the longitudinal 0°-90°-0° arrangement of the unit cell of the arc-shaped super-damping vibration isolation device with low broadband bandgap characteristics of the present invention

[0023] Fig. 9 Schematic diagram of the arc-shaped ultra-damping vibration isolation device with low broadband bandgap characteristics in the longitudinal direction of 0°-90°-0°

[0024] Fig.10 It is a schematic diagram of the longitudinal 90°-0°-90° arrangement of the unit cells of the arc-shaped super-damping vibration isolation device with low broadband bandgap characteristics of the present invention;

[0025] Fig.11 It is a longitudinal 90°-0°-90° schematic diagram of the arc-shaped super-damping vibration isolation device with low broadband bandgap characteristics of the present invention. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] See also Figure 1 , an arc-shaped ultra-damping vibration isolation device with low broadband bandgap characteristics consists of multiple identical Figure 1 The unit cell shown is Figure 4 , Figure 6 , Figure 8 and Fig.10 The four arrangements shown are composed of Figure 5 , Figure 7 , Fig. 9 and Fig.11 Vibration isolation device shown. Figure 1 The four sides with arc-shaped boundaries are the filtering direction, that is, 0°, and the upper and lower parallel surfaces are the bearing direction, that is, 90°. Figure 3 In the band gap diagram shown, the shaded portion is the band gap. When the elastic wave falls within the band gap described in the shaded portion, the elastic wave cannot pass through or is greatly attenuated, thereby achieving a vibration isolation effect.

[0028] The above material combinations are for reference only. You can choose appropriate materials according to your needs.

[0029] Based on the high damping characteristics of viscoelastic materials and the design concept of local resonance acoustic metamaterials, the mass block composed of steel columns wrapped in concrete plays a bearing role inside, and the elastic matrix is ​​wrapped outside the mass block to connect with adjacent units, and the traditional square boundary is replaced by an arc-shaped boundary to reduce the contact area between adjacent cells. When seismic waves or other elastic waves come, the elastic matrix wraps the internal mass block to cause torsional deformation to open the band gap, isolate seismic waves of specific frequencies, and prevent seismic waves from passing through, thereby achieving the effect of vibration isolation. At the same time, the direction with filtering effect is named 0 degrees, and the direction with bearing capacity is 90 degrees. Through the 0°-90°-0° or 90°-0°-90° method, it is arranged horizontally or vertically to form a new type of vibration isolation support with both bearing capacity and filtering capacity.

[0030] The above contents are only preferred implementation cases of the present invention. For those skilled in the art, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes, and the contents of this specification should not be understood as limiting the present invention. The present invention should not be limited to building vibration isolation, but can also be applied to vibration isolation in the fields of aerospace, ships, transportation, and automobiles.

[0031] In summary, the present invention relates to an arc-shaped super-damping vibration isolation device with low broadband bandgap characteristics. Based on the high damping characteristics of viscoelastic materials and the design concept of local resonance type acoustic metamaterials, a mass block composed of steel columns is wrapped with concrete to play a bearing role inside, and an elastic matrix is ​​wrapped outside the mass block to connect with adjacent units, and the traditional square boundary is replaced by an arc-shaped boundary to reduce the contact area between adjacent cells. When seismic waves or other elastic waves come, the elastic matrix wraps the internal mass block to cause torsional deformation to open the band gap, isolate seismic waves of specific frequencies, and make it impossible for seismic waves to pass through, thereby achieving the effect of vibration isolation. At the same time, the direction with filtering effect is named 0 degrees, and the direction with bearing capacity is 90 degrees. Through the 0°-90°-0° or 90°-0°-90° method, it is arranged horizontally or vertically to form a new type of vibration isolation support with both bearing capacity and filtering capacity. The present invention is different from previous periodic structures. One-dimensional and two-dimensional periodic structures cannot block seismic waves in other directions, while the existing three-dimensional periodic structures have poor vibration reduction performance and cannot cover extremely low-frequency seismic waves. A unit cell with a low-frequency bandgap characteristic is designed, and a vibration reduction device is formed with this unit cell, which has both load-bearing capacity and filtering capacity. When seismic waves or other elastic waves are transmitted, elastic waves in a specific range are blocked, thereby protecting the building. The present invention should not be limited to building vibration isolation, but can also be used in vibration isolation in aerospace, shipping, transportation, and automobile fields.

Claims

1. An arc-shaped ultra-damping vibration isolation device with low broadband bandgap characteristics, characterized in that: This vibration reduction device with the low-frequency bandgap characteristics of phononic crystals is based on the high damping characteristics of viscoelastic materials and the design concept of local resonance acoustic metamaterials. It consists of multiple unit cells with low broadband bandgap characteristics and the same structure and two upper and lower steel plates; the unit cell consists of an elastic matrix with an arc-shaped boundary, a square concrete covering layer and an internal steel column, which ensures that the structure has sufficient bearing capacity; the unit cell is a rectangular parallelepiped; the external elastic matrix replaces the traditional square boundary with an arc, thereby reducing the contact area between adjacent unit cells.

2. The arc-shaped ultra-damping vibration isolation device with low broadband bandgap characteristics according to claim 1, characterized in that: The mass blocks composed of internal concrete and steel columns are all rectangular, ensuring the bearing capacity of the structure in all directions.

3. The arc-shaped ultra-damping vibration isolation device with low broadband bandgap characteristics according to claim 1, characterized in that: It can open the first band gap of extremely low frequency of 2.47Hz-16.17Hz, which can cover most of the main frequency bands of earthquake motion.

4. The arc-shaped ultra-damping vibration isolation device with low broadband bandgap characteristics according to claim 3, characterized in that: The geometric dimensions of each part can be changed by calculation according to the requirements to obtain the required band gap range.

5. The arc-shaped ultra-damping vibration isolation device with low broadband bandgap characteristics according to claim 2, characterized in that: The mass block composed of concrete and steel columns has high rigidity, ensuring that the structure has sufficient bearing capacity.

6. The arc-shaped super-damping vibration isolation device with low broadband bandgap characteristics according to claim 4 or 5, characterized in that: The direction with filtering effect is named 0°, and the direction with carrying capacity is named 90°.

7. The arc-shaped ultra-damping vibration isolation device with low broadband bandgap characteristics according to claim 6, characterized in that: Arranged in 0°-90°-0° or 90°-0°-90°.

8. The arc-shaped ultra-damping vibration isolation device with low broadband bandgap characteristics according to claim 7, characterized in that: The arrangement direction is divided into horizontal or vertical arrangement.

9. The arc-shaped ultra-damping vibration isolation device with low broadband bandgap characteristics according to claim 6, characterized in that: The above material combination is for reference only. You can choose the appropriate material combination according to your needs.

Images