Broadband inverted T-shaped seismic metamaterial

Materials & Design

Shu-Yan Zhang¹  Liyun Cao²  Yi Zeng²  Yan-Feng Wang²  Qiu-Jiao Du³  Yue-Sheng Wang³  Yifan Zhu³  Hong-Tao Zhou⁴  Badreddine Assouar⁵ 

[1] Institut Jean Lamour, CNRS, University de Lorraine, Nancy 54506, France;Department of Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin 300350, China;Institut Jean Lamour, CNRS, University de Lorraine, Nancy 54506, France;Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, China;School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, China;

关键词: Seismic metamaterials;    Surface waves;    Inverted T-shaped;    First bandgap;    Relative bandwidth;    Large-scale field experiments;   

DOI  :  

来源: DOAJ

【 摘 要 】

Seismic metamaterials (SMs) are expected to assist or replace traditional isolation systems owing to their strong attenuation of seismic waves. In this work, a one-dimensional inverted T-shaped SM (1D ITSM) composed of arrays of inverted T-shaped structures on a half space is proposed, which have an ultra-wide first bandgap (FBG) from 6.7 to 17.2 Hz. We find that the FBG is composed of two parts; part 1 with surface evanescent waves from 6.7 to 11.0 Hz and part 2 with no surface modes from 11.0 to 17.2 Hz by using the complex band structures. The propagation of seismic surface waves in the 1D ITSM is different in these two frequency ranges of the FBG. In part 1, the seismic surface waves are significantly attenuated in the 1D ITSM because of the surface evanescent waves, while in part 2, the surface waves are converted into bulk waves because surface waves cannot exist in the ITSM. Finally, the ultra-wide FBG is verified by using a kind of the two-dimensional ITSM in large-scale field experiments.

【 授权许可】

Unknown