期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 51, 期 10, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aaaac0
关键词
seismic metamaterial; fractal structures; finite element method; band gaps
资金
- National Natural Science Foundation of China [41404041]
- China Postdoctoral Science Foundation [2014M562079, 2016T90739]
- Teaching Project Foundation of Laboratory in China University of Geosciences [SKJ2016210]
The application of metamaterial in civil engineering to achieve isolation of a building by controlling the propagation of seismic waves is a substantial challenge because seismic waves, a superposition of longitudinal and shear waves, are more complex than electromagnetic and acoustic waves. In this paper, we design a broadband seismic metamaterial based on H-shaped fractal pillars and report numerical simulation of band structures for seismic surface waves propagating. Comparative study on the band structures of H-fractal seismic metamaterials with different levels shows that a new level of fractal structure creates new band gap, widens the total band gaps and shifts the same band gap towards lower frequencies. Moreover, the vibration modes for H-fractal seismic metamaterials are computed and analyzed to clarify the mechanism of widening band gaps. A numerical investigation of seismic surface waves propagation on a 2D array of fractal unit cells on the surface of semi-infinite substrate is proposed to show the efficiency of earthquake shielding in multiple complete band gaps.
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