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Published September 2015 | public
Journal Article

Wide band-gap seismic metastructures


Metamaterials exploit local resonances to reflect acoustic signals with wavelengths well above the characteristic size of the material's structure. This has allowed obtaining materials that present low-frequency (albeit narrow) band gaps or devices for optical and acoustic cloaking. In this work, we propose to use an array of resonating structures (herein termed a "metastructure") buried around sensitive buildings to control the propagation of seismic waves. These seismic metastructures consist of arrays of cylindrical tubes containing a resonator suspended by soft bearings. To obtain broadband attenuation characteristics, each resonator in the array is designed to exhibit a different eigenfrequency. We study the response of these systems using numerical analysis and scaled (1:30) experiments. We target wave mitigation in the infrasound regime (1–10 Hz), a range of frequencies relevant for the protection of large buildings.

Additional Information

© 2015 Elsevier Ltd. Received 6 April 2015; Received in revised form 27 May 2015; Accepted 27 May 2015. We acknowledge helpful discussions with Prof. E. Schatzi (ETH Zurich), Prof. B. Stojadinovic (ETH Zurich) and A. Palermo (Univ. of Bologna). Furthermore we acknowledge the assistance of A. Bergamini (ETH Zurich) and J. Tomasina (ETH Zurich) in the development of the experimental setup.

Additional details

August 22, 2023
October 20, 2023