Three-dimensional face-centered cubic seismic metamaterial with low-frequency seismic reduction characteristic

Abstract

The invention provides a three-dimensional face-centered cubic seismic metamaterial with a low-frequency seismic reduction characteristic. The three-dimensional face-centered cubic seismic metamaterial comprises a cubic shell with three through holes, wherein central cylinders penetrate through the through holes of the cubic shell to be coaxial and point to the shell center of the cubic shell; andthe base surfaces of the central cylinders are parallel to the outer surface of the cubic shell, the side faces of the central cylinders are connected with the inner wall of the cubic shell through fan-shaped block structures, and the cubic shell, the fan-shaped block structures and the central cylinders are made of three different materials. According to the three-dimensional face-centered cubicseismic metamaterial with the low-frequency seismic reduction characteristic, under the condition that the sizes are the same, the mass is lighter, and the low-frequency band gap characteristic can be generated, so that the controllable band gap range is achieved for seismic waves; a band gap of the three-dimensional face-centered cubic seismic metamaterial can be adjusted by adjusting the numberof the fan-shaped blocks, the height of the central cylinders, the fan-shaped angles of the fan-shaped blocks and the wall thickness of the cubic shell, and compared with a bragg scattering type seismic metamaterial, the metamaterial has the advantages of being easy to arrange and saving materials; and the three-dimensional face-centered cubic seismic metamaterial with the low-frequency seismic reduction characteristic can be used for building foundation filling, and effective seismic reduction protection is carried out on important building infrastructures.

Description

Technical field [0001] The invention belongs to the technical field of seismic damping, and particularly relates to a three-dimensional face-centered cubic seismic metamaterial with low-frequency damping characteristics. Background technique [0002] Earthquake is a serious natural disaster. With its suddenness and strong destructiveness, it seriously threatens people's life and property safety, so earthquake protection is particularly important. [0003] Elastic metamaterials are dielectric materials with periodic structures. Because they can inhibit the propagation of seismic waves within a certain range, they have received extensive attention from scholars. In recent years, people have begun to develop elastic metamaterials from the field of solid physics to the field of seismic engineering, resulting in a new shock-absorbing technology, namely seismic metamaterials. [0004] Most of the existing seismic metamaterials are two-dimensional structures, and the main layout is periodi...

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Problems solved by technology

[0004] Most of the existing seismic metamaterials are two-dimensional structures, and the main layout form is periodic layout protection. Due to the limitations of the structure, they can only absorb the seismic waves of the surface layer, and cannot fully shield the seismic waves in all directions.

Recently, the research on three-dimensional structures of seismic metamaterials mostly focuses on simple cubic structures. Because the structures are filled with solid materials and the existing structures are large in size, they are often concentrated within a range of several meters or even tens of meters to achieve the desired architectural properties. The frequency of shock absorption (0-40Hz) is required, so the existing structures generally need to use a lot of materials during construction, which increases their construction costs; at the same time, because of their large size and structure, there are many inconveniences during installation and transportation.

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