Bandgap mechanism and seismic wave attenuation performance of buried seismic metamaterials with double resonators

Abstract

The utilization of the band gap properties in periodic structures can control the propagation of elastic waves, leading to a focus in recent years on seismic metamaterials, but it is challenging to obtain ultrawide low-frequency bandgaps. To broaden the low-frequency band gaps, two approximately equivalent buried seismic metamaterials with double resonators (BMDR) were proposed based on theoretical derivations and analyses. The mechanisms behind band gap formation and seismic wave attenuation capabilities were thoroughly investigated and validated through finite element calculations. The results show that the BMDR can generate a low-frequency wide band gap and exhibit strong attenuation of seismic waves within the band gap range. On average, the BMDR attenuated seismic waves by approximately 80 % within the local resonance band gap and by about 40 % within the Bragg band gap without amplifying seismic responses outside these band gaps.