Engineered metabarrier as shield from seismic surface waves
By A. Palermo, S. Krödel, Alessandro Marzani, Chiara Daraio. 2016
283 citations recorded by the source corpus.
Resonant metamaterials have been proposed to reflect or redirect elastic waves at different length scales, ranging from thermal vibrations to seismic excitation. However, for seismic excitation, where energy is mostly carried by surface waves, energy reflection and redirection might lead to harming surrounding regions. Here, we propose a seismic metabarrier able to convert seismic Rayleigh waves into shear bulk waves that propagate away from the soil surface. The metabarrier is realized by burying sub-wavelength resonant structures under the soil surface. Each resonant structure consists of a cylindrical mass suspended by elastomeric springs within a concrete case and can be tuned to the resonance frequency of interest. The design allows controlling seismic waves with wavelengths from 10-to-100 m with meter-sized resonant structures. We develop an analytical model based on effective medium theory able to capture the mode conversion mechanism. The model is used to guide the design of metabarriers for varying soil conditions and validated using finite-element simulations. We investigate the shielding performance of a metabarrier in a scaled experimental model and demonstrate that surface ground motion can be reduced up to 50% in frequency regions below 10 Hz, relevant for the protection of buildings and civil infrastructures.
Subfields: Biomedical Engineering, Electronic, Optical and Magnetic Materials, Geophysics
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Citations in the corpus
- How to See Hidden Patterns in Metamaterials with Interpretable Machine Learning (2021, background): “or stiffness [13, 15]) has been experimentally observed at different scales, which has prompted engineers to explore their use in different applications, ranging from materials for advanced batteries [62], to energy harvesting [12], seismic protection [7, 26, 46, 47], vibration or sound insulation [”
- Hybridization of Guided Surface Acoustic Modes in Unconsolidated Granular Media by a Resonant Metasurface (2018, methodology): “We remark that similar resonant surface conditions have been successfully used to describe the hybridization of Rayleigh waves with resonances at a different length scale [10,14].”