A linkage-oscillating seismic metasurface

Abstract

This invention discloses a linkage-driven oscillating seismic metasurface. Miniaturization of the seismic metasurface's structural size and lower deployment cost are key technologies for its engineering application. This invention includes multiple equally spaced linkage-driven oscillating devices enclosing the building to be protected. Each device comprises a support column, a connecting rod, a mass block, and a spring hinge. The support column is perpendicular to the ground surface, with its base embedded in the surface soil. A spring hinge is located at the top of the support column, hinged to one end of the connecting rod. The other end of the connecting rod is fixedly connected to the mass block. The length of the connecting rod and the height of the support column can be adjusted by changing the size of the mass block, making the metasurface's structural size acceptable for practical engineering applications. The linkage-driven oscillating seismic metasurface can be deployed around existing buildings to enhance their seismic resistance.

Description

Technical Field

[0001] This invention belongs to the field of building seismic resistance technology, specifically relating to a linkage swing seismic metasurface. Background Technology

[0002] Monitoring and measurement during tunnel construction and operation can effectively ensure the stability and safety of tunnel structures. Earthquakes are one of the most severe natural disasters facing humanity. When an earthquake occurs, densely populated cities or important building structures often suffer fatal damage, causing enormous casualties and property losses. Currently, seismic-resistant measures built into building structures are widely used. While these measures can mitigate the damage to structures caused by earthquakes, even moderate and large earthquakes can cause irreparable damage to seismic structures and building components. At the same time, these seismic-resistant measures often cannot effectively protect existing buildings from earthquakes, and ancient buildings and structures constructed in earlier years still face significant earthquake risks.

[0003] Earthquakes are triggered by sudden movements of the Earth's crust and propagate in the form of seismic body waves and seismic surface waves. Seismic body waves have a limited range of influence, while seismic surface waves carry a large amount of energy and do not easily attenuate with increasing propagation distance, making them a key factor in causing large-scale and severe damage during earthquakes. Seismic metasurfaces, which can directly attenuate the propagation of seismic surface waves, can overcome the problems of traditional earthquake-resistant measures and represent an innovative earthquake-resistant technology. However, existing seismic metasurfaces still suffer from excessively large structural dimensions and high deployment costs, hindering their engineering applications. Therefore, miniaturizing the structural size and reducing the deployment cost of seismic metasurfaces are key technologies for realizing their engineering applications. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a linkage swing seismic metasurface, comprising multiple equally spaced and closely arranged linkage swing devices, which enclose the protected structure or protected area in the center, so that seismic surface waves from any direction can be attenuated by the seismic metasurface, with small structural size and low deployment cost.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A linkage swing seismic metasurface, characterized in that it includes multiple linkage swing devices arranged at equal intervals, wherein the linkage swing devices are enclosed by the protected building;

[0007] The linkage swing device includes a support column, a connecting rod, a mass block, and a spring hinge;

[0008] The support column is perpendicular to the ground surface, and the bottom of the support column is buried in the surface soil layer;

[0009] The top of the support column is provided with a spring hinge, which is hinged to one end of the connecting rod;

[0010] A mass block is fixedly connected to the other end of the connecting rod.

[0011] Furthermore, the material parameters of the support column are: Young's modulus: E st =210 GPa, Poisson's ratio μ st =0.3 and mass density ρ st =7850kg / m 3 ;

[0012] Furthermore, the spring hinge is linearly elastic, allowing a deformation range of... Between these values, the stiffness should not be less than 1000 N·m / rad. The specific stiffness value of the spring hinge should be determined jointly based on the soil conditions and the height of the support column.

[0013] The beneficial effects of this invention are:

[0014] 1) The length of the connecting rod and the height of the support column in this invention can be adjusted by changing the size of the mass block, so that the size of the metasurface structure can be accepted by practical engineering.

[0015] 2) The linkage swing seismic metasurface of the present invention can be composed of only one material, and the fixing method with the ground surface is relatively simple, making it easy to build on a large scale;

[0016] 3) The linkage rocking seismic metasurface of the present invention can be deployed around existing buildings to improve their seismic resistance. Attached Figure Description

[0017] Figure 1 This is a schematic cross-sectional view of the rocking seismic metasurface with linkages arranged around the building according to the present invention;

[0018] Figure 2 This is a schematic diagram of the linkage swing device of the present invention;

[0019] Figure 3 This is a schematic diagram of the static state of the linkage swing device of the present invention;

[0020] Figure 4 This is a schematic diagram of the working state of the linkage swing device of the present invention. Detailed Implementation

[0021] The present invention will now be described in detail with reference to specific embodiments.

[0022] This invention utilizes the effective medium theory and soil-structure resonance to realize a small-sized seismic metasurface, which encloses the protected structure or area in a closed manner at the center, so that seismic surface waves from any direction can be attenuated by the seismic metasurface, thereby protecting the designated building or key area.

[0023] like Figure 1 As shown, the present invention includes multiple equally spaced linkage swing devices, which are used to enclose the protected building.

[0024] like Figure 2 As shown, the linkage swing device includes a support column, a connecting rod, a mass block, and a spring hinge;

[0025] The support column is perpendicular to the ground surface, and its bottom is buried in the surface soil layer to fix the entire linkage swing device. This fixing method allows the support column to be easily deployed and is not easily restricted by soil conditions. The material parameters of the support column are: Young's modulus: E st =210 GPa, Poisson's ratio μ st =0.3 and mass density ρ st =7850kg / m 3 The support columns can be made of Q235 steel or directly from structural steel. The total height H0 and embedment depth H of the support columns are specified. s It is determined by the properties of the soil layer, but it is necessary to ensure the relative fixation between the soil layer and the supporting column;

[0026] A spring hinge is installed at the top of the support column, which is hinged to one end of the connecting rod to transmit the swing force of the connecting rod and provide elastic restoring force for the swing of the connecting rod; the spring hinge is linearly elastic, and the allowable deformation range is within... Between these values, the stiffness should not be less than 1000 N·m / rad. The specific stiffness value of the spring hinge should be determined based on the soil conditions and the height of the support column.

[0027] The other end of the connecting rod is fixedly connected to a mass block; the rotational inertia of the entire connecting rod about the hinge point can be adjusted; the length of the connecting rod and the height of the support column can be combined and adjusted by changing the size of the mass block, so that the structural dimensions can be accepted by actual engineering.

[0028] The working principle of this invention is as follows:

[0029] In the absence of an earthquake, the linkage swing device is in a static state, and the schematic diagram of the structure under its own weight is shown below. Figure 3 As shown;

[0030] like Figure 4As shown, when a seismic surface wave from any direction is incident on the oscillating seismic metasurface of the connecting rod, the supporting column vibrates under the excitation of the seismic surface wave, causing the hinged connecting rod to oscillate. According to the effective medium theory, the oscillating mass-connecting device interacts with the ground, causing the top of the supporting column to experience lateral and longitudinal forces from the oscillation. Since the lateral force has a certain eccentricity with the fixed end of the supporting column, the oscillating connecting rod can also generate an additional bending moment. The oscillating lateral force, oscillating longitudinal force, and additional bending moment of the connecting rod can resonate synergistically with the Earth's crust and surface, achieving attenuation and regulation of the seismic surface wave.

[0031] The content of this invention is not limited to the embodiments listed. Any equivalent modifications made by those skilled in the art to the technical solutions of this invention by reading this specification are covered by the claims of this invention.

Claims

1. A linkage-driven, oscillating seismic metasurface device, characterized in that: It includes multiple equally spaced linkage swing devices, which will be enclosed by the protected building; The linkage swing device includes a support column, a connecting rod, a mass block, and a spring hinge; The support column is perpendicular to the ground surface, and the bottom of the support column is buried in the surface soil layer; The top of the support column is provided with a spring hinge, which is hinged to one end of the connecting rod; A mass block is fixedly connected to the other end of the connecting rod.

2. The linkage swing seismic metasurface device according to claim 1, characterized in that: The material parameters of the support column are: Young's modulus: Poisson's ratio and mass density .

3. The linkage swing seismic metasurface device according to claim 2, characterized in that: The spring hinge is linearly elastic, and the permissible deformation range is within... Between, the stiffness is not less than 1000 The specific stiffness value of the spring hinge should be determined based on the soil conditions and the height of the support column.

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