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)
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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