A broadband seismic metamaterial plate with simple structure and easy realization

Abstract

A novel seismic metamaterial plate consisting of two common building materials, which has the advantages of simple structure and easy to realize, is proposed. The seismic metamaterial plate creates a wide bandgap with a relative bandwidth of 1. Using numerical simulation, the bandgap properties of the metamaterial plate both in a free space and on a half space are studied and it is found that the wide bandgap of the free plate is kept even if in half space. Using scaled (1:30) experiments under 1 g conditions and simulations, we study the transmission spectrum under the surface waves incident on the seismic metamaterial plate and verify that it has a good attenuation effect in the corresponding frequency range. This work paves the way to the design of seismic metamaterials allowing an unparalleled control of surface wave propagation.

A Review of Research on Seismic Metamaterials

“…In recent years, significant research has introduced the local resonance mechanism in the construction of SMs. [6][7][8]14,[21][22][23][24][25][26][27][30][31][32][33][34][35][36]38,39,41,[47][48][49]55,56,61,62,64] The local resonance bandgap is the result of coupling between the long traveling wave property and the resonance characteristic of the periodic local oscillator in the matrix. The existence of coupling is the key factor to determine whether the bandgap is generated.…”

“…[48] Zeng et al pointed out in the scaled experiments of the SM plate composed of steel blocks wrapped by foam, that, due to local resonance, even if one row of SMs was arranged, the attenuation of surface waves within the expected frequency range was very obvious. [49]…”

“…In the experiments, the unit cells were manufactured manually, and the experimental substrate setup was constructed using a glass box filled with sand. [49]…”

“…Although some scholars have conducted 3D structural research considering waves in any given direction, [16,24,31,32,55,61,62,108,129] most of the existing studies are based on the 2D simplified model to analyze the propagation of waves. [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50]55,56,58,59,[61][62][63][64][65][66]68,70,[106][107][108]110,[112][113][114][116][117][118]…”

“…This provided a new idea for the application of phononic crystals in low‐frequency vibration and noise reduction. In recent years, significant research has introduced the local resonance mechanism in the construction of SMs …”