Broadband inverted T-shaped seismic metamaterial

• Large-scale field experiments demonstrate the ultra-wide first bandgap. Achieve a bandgap with relative bandwidth of 1.17. Study characteristic by using complex band structures. Seismic metamaterials (SMs) are expected to assist or replace traditional isolation systems owing their strong attenuation seismic waves. In this work, one-dimensional inverted T-shaped SM (1D ITSM) composed arrays structures on half space is proposed, which have an (FBG) from 6.7 17.2 Hz. We find that FBG two parts; part 1 surface evanescent waves 11.0 Hz and 2 no modes The propagation in 1D ITSM different these frequency ranges FBG. 1, significantly attenuated because waves, while 2, converted into bulk cannot exist ITSM. Finally, verified kind two-dimensional large-scale experiments.