A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The invention discloses a low-frequency broadband seismic metasurface structure which comprises metasurface unit cells arranged periodically, each metasurface unit cell is composed of a base body and a scattering unit embedded in the base body, and the center of the scattering unit coincides with the center of the base body; and each scattering unit comprises one or more scatterers which are used for forming metasurface structures with different band gap frequencies. The low-frequency broadband seismic metasurface structure can form a complete forbidden band to prevent propagation of Rayleigh waves, can also form a negative energy band, can convert the Rayleigh waves into body waves, and expands the attenuation domain of the Rayleigh waves; rayleigh waves can be reflected or converted into body waves, and the influence of seismic surface waves on the structure is greatly reduced, so that the safety of the structure is ensured.
本发明公开了一种低频宽带的地震超表面结构，低频宽带的地震超表面结构，包括周期性设置的各个超表面单胞，超表面单胞由基体以及嵌入设置在基体内的散射单元构成，且散射单元的中心与基体的中心重合；每个散射单元均包括一个或多个散射体，用于构成不同带隙频率的超表面结构。该低频宽带的地震超表面结构能够形成完全禁带，阻止Rayleigh波的传播，还能形成负能带，可以将Rayleigh波转化为体波，扩大了Rayleigh波的衰减域；可将Rayleigh波反射或转化为体波，极大降低地震表面波对结构的影响，从而保证结构的安全性。
The invention discloses a low-frequency broadband seismic metasurface structure which comprises metasurface unit cells arranged periodically, each metasurface unit cell is composed of a base body and a scattering unit embedded in the base body, and the center of the scattering unit coincides with the center of the base body; and each scattering unit comprises one or more scatterers which are used for forming metasurface structures with different band gap frequencies. The low-frequency broadband seismic metasurface structure can form a complete forbidden band to prevent propagation of Rayleigh waves, can also form a negative energy band, can convert the Rayleigh waves into body waves, and expands the attenuation domain of the Rayleigh waves; rayleigh waves can be reflected or converted into body waves, and the influence of seismic surface waves on the structure is greatly reduced, so that the safety of the structure is ensured.
本发明公开了一种低频宽带的地震超表面结构，低频宽带的地震超表面结构，包括周期性设置的各个超表面单胞，超表面单胞由基体以及嵌入设置在基体内的散射单元构成，且散射单元的中心与基体的中心重合；每个散射单元均包括一个或多个散射体，用于构成不同带隙频率的超表面结构。该低频宽带的地震超表面结构能够形成完全禁带，阻止Rayleigh波的传播，还能形成负能带，可以将Rayleigh波转化为体波，扩大了Rayleigh波的衰减域；可将Rayleigh波反射或转化为体波，极大降低地震表面波对结构的影响，从而保证结构的安全性。
Low-frequency broadband seismic metasurface structure
一种低频宽带的地震超表面结构
YU WEIJIA (author)
2023-09-05
Patent
Electronic Resource
Chinese
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