论文标题
宽带倒置T形地震超材料
Broadband inverted T-shaped seismic metamaterial
论文作者
论文摘要
地震超材料（SMS）有望帮助或取代传统的隔离系统，因为它们强烈地衰减地震波。在本文中，提出了一维倒置的T形SM（1D ITSM），该SM（1D ITSM）提出了超宽的第一带隙（FBG）。计算复杂的带结构以分析SMS中表面波的波特性。我们发现1D ITSM的FBG由两个部分组成。第1部分具有表面渐射波和没有表面模式的第2部分。在由定期布置的支柱和底物组成的SM的FBG的复杂带结构中也发现了类似的结果。在FBG的这两个频率范围内，1D ITSM中的地震表面波的传播不同。在第1部分中，地震表面波在1D ITS中显着减弱，而在第2部分中，表面波被转化为散装波。最后，通过在大规模场实验中使用一种二维ITSM来验证超宽的FBG。
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.
