Low-frequency broadband seismic metamaterial using I-shaped pillars in a half-space
Low-frequency broadband seismic metamaterial using I-shaped pillars in a half-space
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DOI：
10.1063/1.5021299
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发表时间：
2018-05
影响因子：
3.2
通讯作者：
Yi Zeng;Yang Xu;Keke Deng;Z. Zeng;Hongwu Yang;M. Muzamil;Qiujiao Du
中科院分区：
文献类型：
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作者：
Yi Zeng;Yang Xu;Keke Deng;Z. Zeng;Hongwu Yang;M. Muzamil;Qiujiao Du
本文提出了一种新型的低频宽带弹性超材料，它是由二维地面上的周期性工字形柱体构成。结合有限元法和Bloch理论，研究了弹性波在三维地震异向介质中的谐波传播。相比之下，对于由圆形和矩形柱组成的两种典型柱结构，所提出的I形地震超材料可以产生更宽的带隙，并且分别在5.8 Hz至8.8 Hz和9.2 Hz至13.0 Hz的频率范围内显著衰减地震表面波。通过计算有限阵列的透射谱和分析两种不同带隙下6.1Hz和10.2Hz处的表面位移场，进一步探讨了带隙的产生机理。最后给出了该材料的最佳几何参数。虽然我们关注的是地球物理...
In this paper, a new type of low-frequency broadband elastic metamaterial is proposed, which is constituted of periodic I-shaped pillars arranged on a two-dimensional ground surface. The propagation of elastic waves through 3D samples of the seismic metamaterial is investigated in the harmonic regime by a combination of the finite element method and Bloch theory. In contrast, with two typical pillar structures consisting of circular and rectangle pillars, the proposed I-shaped seismic metamaterial can yield wider bandgaps and significantly attenuate the seismic surface waves at the frequencies ranging from 5.8 Hz to 8.8 Hz and from 9.2 Hz to 13.0 Hz, respectively. The generation mechanism of the bandgaps is further explored by computing the transmission spectra through a finite array and analyzing the displacement fields of the surface at 6.1 Hz and 10.2 Hz in two different bandgaps. The optimal geometric parameters of the I-shaped seismic metamaterial are also provided. Although we focus on the geophysic...