1. Broadband inverted T-shaped seismic metamaterial
- Author
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Badreddine Assouar, Yifan Zhu, Hong-Tao Zhou, Liyun Cao, Yue-Sheng Wang, Yi Zeng, Qiujiao Du, Yan-Feng Wang, Shu-Yan Zhang, Tianjin University (TJU), Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Beijing Jiaotong University (BJTU), and China University of Geosciences [Wuhan] (CUG)
- Subjects
Surface (mathematics) ,Materials science ,Seismic metamaterials ,Field (physics) ,Band gap ,Relative bandwidth ,Acoustics ,FOS: Physical sciences ,Physics::Optics ,Large-scale field experiments ,Applied Physics (physics.app-ph) ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Seismic wave ,General Materials Science ,First bandgap ,Materials of engineering and construction. Mechanics of materials ,ComputingMilieux_MISCELLANEOUS ,[PHYS]Physics [physics] ,Mechanical Engineering ,Attenuation ,Metamaterial ,Physics - Applied Physics ,Half-space ,Surface waves ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Mechanics of Materials ,Surface wave ,TA401-492 ,0210 nano-technology ,Inverted T-shaped - Abstract
Seismic metamaterials (SMs) are expected to assist or replace traditional isolation systems owing to their strong attenuation of seismic waves. In this paper, a one-dimensional inverted T-shaped SM (1D ITSM) with an ultra-wide first bandgap (FBG) is proposed. The complex band structures are calculated to analyze the wave characteristics of the surface waves in the SMs. We find that the FBG of the 1D ITSM is composed of two parts; part 1 with surface evanescent waves and part 2 with no surface modes. Similar results are found in the complex band structure of the FBG of the SM consisting of periodically arranged pillars and substrate. 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, while in part 2, the surface waves are converted into bulk waves. Finally, the ultra-wide FBG is verified by using a kind of the two-dimensional ITSM in large-scale field experiments., 30 pages,15 figures
- Published
- 2021