Seismic metamaterials based on isochronous mechanical oscillators

Finocchio, G.; Casablanca, Orazio; Ricciardi, Giuseppe; Alibrandi, Umberto; Garescì, Francesca; Chiappini, M.; Azzerboni, B.

doi:10.1063/1.4876961

“…Shi et al (2014) propose a periodic foundation made up of concrete layers intermixed with rubber blocks, resulting in band gaps as low as 2.5 Hz, with the outcomes experimentally supported in Yan et al (2014) and Xiang et al (2012). Finocchio et al (2014) follow a different approach via composition of a seismic metamaterial from isochronous spherical oscillators rolling over a cycloidal trajectory. Shi (2013a, 2013b) integrate the periodic theory in the design of two-dimensional (2D) pile barriers and succeed in filtering out plane waves.…”

Section: Introductionmentioning

confidence: 99%

On the feasibility of structural metamaterials for seismic-induced vibration mitigation

Wagner

¹

,

Dertimanis

²

,

Antoniadis

³

et al. 2016

IJEIE

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This paper summarizes recent efforts toward development of locally resonant metamaterial structures for seismic isolation purposes. The metamaterial structure forms a blind zone in the frequency domain, inhibiting the propagation of waves characterised by frequencies lying within this range. The feasibility of fashioning such systems in the [0.5, 5] Hz frequency band, linked to earthquake induced response, is here explored. An analytical and numerical investigation is undertaken relying on Bloch's theory and classical vibration analysis. The analysed case-studies pertain to both one-dimensional and two-dimensional mass-in-mass lattice systems investigated for overlapping sub-bands. On the basis of the offered analysis, a basic unit cell design is proposed, and a parametric study is carried out revealing the critical influence of the external-to-internal stiffness ratios adopted for the unit cell design. A further discussion is offered with respect to limitations and extensions of the proposed designs.Keywords: seismic isolation; metamaterials; metastructures; Bloch's theory; 1D and 2D vibration response analysis; periodic lattice; mass-in-mass unit cells; band-gaps. On the feasibility of structural metamaterials 21Reference to this paper should be made as follows: Wagner, P.R., Dertimanis, V.K., Antoniadis, I.A. and Chatzi, E.N. (2016)

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“…16 Finocchio et al introduced a seismic metamaterial composed of a chain of mass-in-mass system, which is able to filter the S-waves of an earthquake. 17 Aravantinos-Zafiris et al 18 reported results for a new layer-by-layer structure, which was studied as a candidate for pentamode behavior and other interesting elastic metamaterial properties. The structure had a simple cubic symmetry with connecting silicon rods, and it was an easy to fabricate structure.…”

Section: Introductionmentioning

confidence: 99%

Large scale phononic metamaterials for seismic isolation

Aravantinos-Zafiris

¹

,

Sigalas

²

2015

Journal of Applied Physics

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A passively tunable acoustic metamaterial lens for selective ultrasonic excitationIn this work, we numerically examine structures that could be characterized as large scale phononic metamaterials. These novel structures could have band gaps in the frequency spectrum of seismic waves when their dimensions are chosen appropriately, thus raising the belief that they could be serious candidates for seismic isolation structures. Different and easy to fabricate structures were examined made from construction materials such as concrete and steel. The well-known finite difference time domain method is used in our calculations in order to calculate the band structures of the proposed metamaterials. V C 2015 AIP Publishing LLC.

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“…The high frequency threshold of the gap is associated to the optical mode, obtained for γα = 0. It may be proven that, for the undamped case, the frequency band of the gap resides in the following interval (Finocchio et al, 2014;Huang et al, 2009) …”

Section: D Infinite Chainmentioning

confidence: 99%

On the feasibility of structural metamaterials for seismic-induced vibration mitigation

Wagner

¹

,

Dertimanis

²

,

Antoniadis

³

et al. 2016

IJEIE

3

0

View full text Add to dashboard Cite

This paper summarizes recent efforts toward development of locally resonant metamaterial structures for seismic isolation purposes. The metamaterial structure forms a blind zone in the frequency domain, inhibiting the propagation of waves characterised by frequencies lying within this range. The feasibility of fashioning such systems in the [0.5, 5] Hz frequency band, linked to earthquake induced response, is here explored. An analytical and numerical investigation is undertaken relying on Bloch's theory and classical vibration analysis. The analysed case-studies pertain to both one-dimensional and two-dimensional mass-in-mass lattice systems investigated for overlapping sub-bands. On the basis of the offered analysis, a basic unit cell design is proposed, and a parametric study is carried out revealing the critical influence of the external-to-internal stiffness ratios adopted for the unit cell design. A further discussion is offered with respect to limitations and extensions of the proposed designs.Keywords: seismic isolation; metamaterials; metastructures; Bloch's theory; 1D and 2D vibration response analysis; periodic lattice; mass-in-mass unit cells; band-gaps. On the feasibility of structural metamaterials 21Reference to this paper should be made as follows: Wagner, P.R., Dertimanis, V.K., Antoniadis, I.A. and Chatzi, E.N. (2016)

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Seismic metamaterials based on isochronous mechanical oscillators

Cited by 103 publications

References 22 publications

On the feasibility of structural metamaterials for seismic-induced vibration mitigation

On the feasibility of structural metamaterials for seismic-induced vibration mitigation

Large scale phononic metamaterials for seismic isolation

On the feasibility of structural metamaterials for seismic-induced vibration mitigation

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