How to advantageously manage the effective ellipticity of seismic waves in metamaterials?

21st International Scientific Conference on Advanced in Civil Engineering "Construction - The Formation of Living Environment"

土木建筑工程

Brulé, Stephane^1 ; Enoch, Stefan^1 ; Guenneau, Sebastien^1

Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France^1

关键词: Beneficial effects;    Design of buildings;    Frequency band width;    Horizontal surface displacement;    Physical process;    Research advances;    Scattered field;    Wave polarizations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/365/4/042063/pdf
DOI  :  10.1088/1757-899X/365/4/042063

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

In addition to the research advances made on the interaction of seismic waves with rigid elements in the ground or with holes, this paper explores the possibilities of acting on the free surface displacement. In particular it is about looking at the beneficial effects of a decrease of horizontal surface displacements in case of Rayleigh waves which directly affect the design of buildings. Exploring this idea, a promising way is to achieve a complete dynamic artificial anisotropy by implementing geometrical elements, full or empty, in the soil. For body or surface waves, the physical process is the coupling of the scattered field displacement with local resonances of stiff elements implemented in the soils. This approach could theoretically lead to enhanced wave-path control, attenuation by energy-dissipation, etc. The Holy Grail would be the achievement of a complete shield for all seismic wave polarizations over a large frequency bandwidth with a seismic metamaterial reminiscent of a perfect flat lens and a seismic cloak detouring surface seismic waves around a designated area.