Large scale mechanical metamaterials as seismic shields

By M. Miniaci, A. Krushynska, F. Bosia, Nicola Maria Pugno. 2016

377 citations recorded by the source corpus.

Earthquakes represent one of the most catastrophic natural events affecting mankind. At present, a universally accepted risk mitigation strategy for seismic events remains to be proposed. Most approaches are based on vibration isolation of structures rather than on the remote shielding of incoming waves. In this work, we propose a novel approach to the problem and discuss the feasibility of a passive isolation strategy for seismic waves based on large-scale mechanical metamaterials, including for the first time numerical analysis of both surface and guided waves, soil dissipation effects, and adopting a full 3D simulations. The study focuses on realistic structures that can be effective in frequency ranges of interest for seismic waves, and optimal design criteria are provided, exploring different metamaterial configurations, combining phononic crystals and locally resonant structures and different ranges of mechanical properties. Dispersion analysis and full-scale 3D transient wave transmission simulations are carried out on finite size systems to assess the seismic wave amplitude attenuation in realistic conditions. Results reveal that both surface and bulk seismic waves can be considerably attenuated, making this strategy viable for the protection of civil structures against seismic risk. The proposed remote shielding approach could open up new perspectives in the field of seismology and in related areas of low-frequency vibration damping or blast protection.

Subfields: Biomedical Engineering, Civil and Structural Engineering

View Paper: https://www.semanticscholar.org/paper/3f0fbf591e1f2953606673e342318740eb8c21f3

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Citations in the corpus

Clamped seismic metamaterials: ultra-low frequency stop bands (2017, positive): “[41] propose using cross-shaped, hollow and locally resonant (with rubber, steel and concrete), cylinders to attenuate both Rayleigh and bulk waves in the 1 to 10 Hz frequency range.”
Emergence of seismic metamaterials: Current state and future perspectives (2017, background): “Interestingly, authors [46] propose using cross-shaped, hollow and locally resonant (with rubber, steel and concrete), cylinders to attenuate both Rayleigh and bulk waves in the 1–10Hz frequency range.”
Coupling local resonance with Bragg band gaps in single-phase mechanical metamaterials (2017, background): “shielding [1,2] or noise abatement [3] to subwavelength imag-”
A hybrid elastic metamaterial with negative mass density and tunable bending stiffness (2017, background): “…applications including lowfrequency vibration shielding, guided wave attenuation, seismic wave mitigation, mechanical wave guiding, absorption and energy harvesting ( Ma and Sheng, 2016; Cummer et al., 2016; Haberman and Guild, 2016; Carrara et al., 2013; Miniaci et al., 2016; Chen et al., 2016a ).”