Partially Embedded Gradient Metabarrier: Broadband Shielding from Seismic Rayleigh Waves at Ultralow Frequencies

Liu, Ze; Qin, Kai-Qiang; Yu, Gui‐Lan

doi:10.1061/(asce)em.1943-7889.0001752

Cited by 29 publications

(22 citation statements)

References 31 publications

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“…which is the ratio of the displacement (u) in a depth of twice (2λ) of the Rayleigh wave wavelength to the entire depth (H) of the substrate. 11,35 The full complex band structure (1 > ξ > 0) is shown on the left of the Fig. 2(a).…”

Section: ξ = ∫ |𝒖|𝑑𝑠mentioning

confidence: 99%

Coupling the first and second attenuation zones in seismic metasurface

Zeng

Cao

Zhu

et al. 2021

Applied Physics Letters

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Semi-infinite elastic metamaterials and metasurfaces on homogeneous elastic halfspaces have attracted significant attention in the past two decades as efficient artificial structures to control and mitigate surface waves. In this research, the first two attenuation zones of an elastic metasurface composed of different arrangements of pillars on a substrate are investigated. First, the lowest-frequency attenuation zone (LFAZ) is numerically investigated. Then, the rainbow trapping effect of the second attenuation zone (SAZ) is demonstrated by numerical simulations and experiments. The different characteristics of these two attenuation zones are brought together to connect lower bound of the SAZ and the upper bound of the LFAZ allowing designing a seismic 2 metasurface that only uses one kind of artificial structure on a half-space to attenuate Rayleigh waves in the frequency range extending from 5 Hz to 22 Hz.

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Section: ξ = ∫ |𝒖|𝑑𝑠mentioning

confidence: 99%

Coupling the first and second attenuation zones in seismic metasurface

Zeng

Cao

Zhu

et al. 2021

Applied Physics Letters

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“…Studies have shown that to simulate the half-space, the thickness of the soil layer should be no less than two Rayleigh wavelengths, 13 that is, H ! 2k Rmax , where k Rmax is the maximum Rayleigh wavelength related to the soil parameters.…”

Section: Problem Description and Finite Element Modelingmentioning

confidence: 99%

“…Pu and Shi 12 studied the attenuation effect of periodic pile barriers for Rayleigh surface waves in layered soils, and verified that periodic pile barriers can effectively attenuate ground vibration caused by trains. Recently, Liu et al 13 studied the seismic isolation mechanism of partially embedded gradient metabarrier (PEGM). The research showed that the PEGM broadens the frequency attenuation zone and the piecewise PEGM further extends the zone to cover the main frequency range of seismic waves from 1 to 20 Hz.…”

Section: Introductionmentioning

confidence: 99%

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Shielding performance of T-shaped periodic barrier for surface waves in transversely isotropic soil

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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Aiming at the vibration isolation in transversely isotropic soil, a T-shaped partially embedded periodic barrier for surface waves is proposed, and its shielding performance is explored by using finite element method combined with Bloch-Floquet theory. Seven independent dimensionless material parameters are derived and their influences on band gaps are discussed numerically. The results show that the band gaps exhibit strong sensitivity to the three parameters out of seven, and the band gaps are far wider in transversely isotropic soils than that in the isotropic. The mass density ratio and the shear modulus ratio of the barrier to the soil, as well as the length ratio of the barrier above the ground to that below, can be used to adjust band gaps effectively to meet the shielding requirements for different frequency ranges under different anisotropic soils. As a case of study, the El Centro seismic wave is considered and found that it can be considerably attenuated by the designed periodic barrier.

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“…Therefore, FADs can be designed to meet the vibration isolation frequency requirements in practical engineering to protect the building. In recent years, many scholars have studied the theory and application of periodic wave barriers, such as periodic piles (Cheng et al., 2013; Liu, Qin, & Yu, 2020; Meng & Shi, 2019), periodic walls (Huang et al., 2017; Marfia & Sacco, 2012), periodic lattice sandwich panels (Yu & Miao, 2019), which can all be used in the real‐life civil/infrastructure engineering to attenuate vibrations caused by cars, railways, subways, or earthquakes.…”

Section: Introductionmentioning

confidence: 99%

A deep learning model for the topological design of 2D periodic wave barriers

Liu

2021

Computer aided Civil Eng

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This study presents a new deep learning (DL) model to design topological configurations of periodic wave barriers to meet different target frequencies and site conditions. The new DL model is composed of an auto‐encoder (AE) and a conditional variational AE, and 230,000 sets of data are generated for training, validating, and testing it. The designed results are in good agreement with the targets, and it only takes a few seconds to complete a design. Two barriers are designed by the proposed method for two practical examples, and the vibrations in peak frequency ranges are attenuated. The DL model makes the design of periodic wave barriers smarter and more efficient.

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Partially Embedded Gradient Metabarrier: Broadband Shielding from Seismic Rayleigh Waves at Ultralow Frequencies

Cited by 29 publications

References 31 publications

Coupling the first and second attenuation zones in seismic metasurface

Coupling the first and second attenuation zones in seismic metasurface

Shielding performance of T-shaped periodic barrier for surface waves in transversely isotropic soil

A deep learning model for the topological design of 2D periodic wave barriers

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