Large scale phononic metamaterials for seismic isolation

Aravantinos-Zafiris, N.; Sigalas, M. M.

doi:10.1063/1.4928405

Cited by 40 publications

(21 citation statements)

References 19 publications

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“…This particular property has opened an innovative direction to reduce earthquake-induced vibrations. [10][11][12] At the outset, two types of applications have been proposed based on this phenomenon: (1) foundations with embedded resonators [13][14][15][16] capable of attenuating seismic waves effects and (2) barriers that are able to redirect surface waves back into the ground. [17][18][19][20] More precisely, Cheng and Shi 14 studied a periodic foundation composed of a reinforced concrete matrix and steel masses that are connected to the matrix with rubber layers.…”

Section: Background and Motivationsmentioning

confidence: 99%

“…This is due to their capability to exhibit low‐frequency band gaps that can be endowed with unit cells much smaller than the wavelength of the desired frequency region. This particular property has opened an innovative direction to reduce earthquake‐induced vibrations . At the outset, two types of applications have been proposed based on this phenomenon: (1) foundations with embedded resonators capable of attenuating seismic waves effects and (2) barriers that are able to redirect surface waves back into the ground …”

Section: Introductionmentioning

confidence: 99%

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Finite locally resonant Metafoundations for the seismic protection of fuel storage tanks

Basone

Wenzel

Bursi

et al. 2018

Earthq Engng Struct Dyn

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Summary This paper introduces a novel seismic isolation system based on metamaterial concepts for the reduction of ground motion‐induced vibrations in fuel storage tanks. In recent years, the advance of seismic metamaterials has led to various new concepts for the attenuation of seismic waves. Of particular interest for the present work is the concept of locally resonant materials, which are able to attenuate seismic waves at wavelengths much greater than the dimensions of their unit cells. Based on this concept, we propose a finite locally resonant Metafoundation, the so‐called Metafoundation, which is able to shield fuel storage tanks from earthquakes. To crystallize the ideas, the Metafoundation is designed according to the Italian standards with conservatism and optimized under the consideration of its interaction with both superstructure and ground. To accomplish this, we developed two optimization procedures that are able to compute the response of the coupled foundation‐tank system subjected to site‐specific ground motion spectra. They are carried out in the frequency domain, and both the optimal damping and the frequency parameters of the Metafoundation‐embedded resonators are evaluated. As case studies for the superstructure, we consider one slender and one broad tank characterized by different geometries and eigenproperties. Furthermore, the expected site‐specific ground motion is taken into account with filtered Gaussian white noise processes modeled with a modified Kanai‐Tajimi filter. Both the effectiveness of the optimization procedures and the resulting systems are evaluated through time history analyses with two sets of natural accelerograms corresponding to operating basis and safe shutdown earthquakes, respectively.

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Section: Background and Motivationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Finite locally resonant Metafoundations for the seismic protection of fuel storage tanks

Basone

Wenzel

Bursi

et al. 2018

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…The concept of metamaterials has been expanded to the elastoacoustic field in recent years. Such metamaterials are now widely applied in the fields of vibration and noise control [6][7][8][9][10], acoustic cloaking [11][12][13], seismic shields [14,15], acoustic wave lensing [16,17], wave trapping [18,19] and acoustic black holes [20,21] among other fields. Effective negative constants can be observed from elastic/acoustic metamaterials as well as electromagnetic metamaterials, including negative mass and dynamic stiffness [22][23][24], negative bulk modulus [25] and double negative characteristic [26,27].…”

Section: Introductionmentioning

confidence: 99%

Rainbow metamaterials for broadband multi-frequency vibration attenuation: Numerical analysis and experimental validation

Meng

Chronopoulos

Fabro

et al. 2020

Journal of Sound and Vibration

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In this study, we propose a 'rainbow' metamaterial to achieve broadband multifrequency vibration attenuation. The rainbow metamaterial is constituted of a Π-shaped beam partitioned into substructures by parallel plates insertions with two attached cantilever-mass acting as local resonators. Both resonators inside each substructure can be non-symmetric such that the metamaterial can have multi-frequency bandgaps. Furthermore, these cantilever-mass resonators have a progressively variant design along the beam, namely rainbow-shaped, for the purpose of achieving broader energy stop bands. Π-shaped beams partitioned by parallel plate insertions can be extended to honeycomb sandwich composites, hence the proposed rainbow metamaterial can serve as a precursor for future honeycomb composites with superior vibration attenuation for more industrial applications. A mathematical model is first developed to estimate the frequency response functions of the metamaterial. Interaction forces between resonators and the backbone structure are calculated by solving the displacement of the cantilever-mass resonators. The plate insertions are modeled as attached masses with both their translational and rotational motion considered. Subsequently, the mathematical model is verified by comparison with experimental results. Metamaterials fabricated through an additive manufacturing technique are tested with a laser doppler receptance measuring system. After the validation of the mathematical model, a numerical study is conducted to explore the influences of the resonator spatial

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“…[27] In 2015, Aravantinos-Zafiris et al considered network topology and a variable cross-section structure. [28] Ungureanu et al found in 2015 that the propagation of seismic waves with a frequency between 1 and 40 Hz can be affected by auxetic-like Figure 2. The metawedge showing, in (a), the geometry and material parameters.…”

Section: Outer-shielded Smsmentioning

confidence: 99%