Hierarchical large-scale elastic metamaterials for passive seismic wave mitigation

Miniaci, Marco; Kherraz, Nesrine; Croënne, Charles; Mazzotti, Matteo; Morvaridi, Maryam; Gliozzi, Antonio; Onorato, Miguel; Bosia, Federico; Pugno, Nicola

doi:10.1051/epjam/2021009

Cited by 16 publications

(7 citation statements)

References 19 publications

(23 reference statements)

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“…This is due to an optimized geometric design of the internal structure [20,21] that can be conveniently manufactured using 3D printing at different scales [28][29][30]. Seismic metamaterials have been successfully proposed to protect buildings from seismic waves by creating shields around the structure through Bragg-scattering structured soils, buried mass or above-surface resonators, auxetic and hierarchical materials [31][32][33][34][35][36]. The periodicity of these media is often at the meter scale, which makes them not suited for use as seismic isolators.…”

Section: Introductionmentioning

confidence: 99%

A biomimetic sliding–stretching approach to seismic isolation

et al. 2021

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There is growing demand in industrialized and developing countries to provide people and structures with effective earthquake protection. Here, we employ architectured material concepts and a bio-inspired approach to trail-blaze a new path to seismic isolation. We develop a novel seismic isolator whose unit cell is formed by linkages that replicate the bones of human limbs. Deformable tendons connect the limb members to a central post carrying the vertical load, which can slide against the bottom plate of the system. While the displacement capacity of the device depends only on the geometry of the limbs, its vibration period is tuned by dynamically stretching the tendons in the nonlinear stress–strain regime, so as to avoid resonance with seismic excitations. This biomimetic, sliding–stretching isolator can be scaled to seismically protect infrastructure, buildings, artworks and equipment with customized properties and sustainable materials. It does not require heavy industry or expensive materials and is easily assembled from metallic parts and 3D-printed components.

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Section: Introductionmentioning

confidence: 99%

A biomimetic sliding–stretching approach to seismic isolation

et al. 2021

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“…The spectral stiffness equation of in-plate vibration for the Kirchhoff plate is given by Eq. ( 7) according [22]:…”

Section: In-plane Vibrationmentioning

confidence: 99%

Periodic structure as seismic barriers

2024

JCE

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Some seismic barriers are periodic structures with the characteristic of frequency band gaps (BGs) similar to sonic crystals, which can protect buildings from damage caused by earthquakes. Their working idea is to arrange periodic structures in the foundation around the buildings you want to protect, and the seismic wave is blocked outside the buildings when the frequencies of seismic waves exactly fall in the frequency BGs of the seismic barriers. Based on sonic crystal, a periodic structure is first presented here, which not only can be utilised as seismic barriers but also has a large internal space to provide the possibility for other functions such as civil air defence construction, line access, etc. The frequency BGs of the presented structure are determined by the spectral element method, and the influence of geometrical parameters and the number of unit cells on the frequency BGs is analysed. Numerical calculation confirms that the proposed structure can effectively isolate some seismic waves.

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“…Subsequent laboratory experiments further demonstrated the efficiency of this attenuation [8][9][10]. Previous SMs can be classified into two groups: resonators fixed on the soil surface [11][12][13][14][15] and piles buried underground [16][17][18][19][20][21]. Recognizing the cost associated with burying piles [22], designed and numerically investigated H-fractal resonator SMs.…”

Section: Introductionmentioning

confidence: 99%

Bio-inspired branch structure seismic metamaterial: attenuating low-frequency Rayleigh waves

Bai,

Li,

Liao

2023

J. Phys. D: Appl. Phys.

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This study investigates the transmission characteristics of natural forests with branches and introduces a bio-inspired branch structure seismic metamaterial designed to create bandgaps for low-frequency Rayleigh waves. Employing the finite element method, we reveal the mechanism behind the generation of these Rayleigh wave bandgaps and their transmission properties. A distinct 'collectivization mode' within the bio-inspired branch structure seismic metamaterial is identified, effectively attenuating Rayleigh waves. A collectivization coefficient is introduced for quantitative characterization, and we extend the analysis to multi-layered soil mediums, demonstrating an interface with the metamaterial's bandgaps. Frequency-domain analysis highlights the difference between using the collectivization mode and traditional methods for attenuating surface waves, offering a novel approach to low-frequency Rayleigh wave reduction with implications in seismology and related fields.

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Hierarchical large-scale elastic metamaterials for passive seismic wave mitigation

Cited by 16 publications

References 19 publications

A biomimetic sliding–stretching approach to seismic isolation

A biomimetic sliding–stretching approach to seismic isolation

Periodic structure as seismic barriers

Bio-inspired branch structure seismic metamaterial: attenuating low-frequency Rayleigh waves

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