瑞利波衰减的地震超材料:土埋水箱超屏障的新概念

IF 3.8 3区 工程技术 Q1 MECHANICS
Andrea Francesco Russillo, Giuseppe Failla
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引用次数: 0

摘要

在正在进行的地震超材料研究的背景下,本文提出了一种用于地震瑞利波衰减的新型超屏障,该屏障被设想为嵌入土壤的圆柱形水箱的周期性阵列,作为土壤表面下的谐振单元。建立了一个理论框架,其中水箱的动力学用经典的三维线性、基于压力的地震流固相互作用模型来处理,土壤被理想化为均匀和各向同性介质,与地震超材料的类似研究一致。由Floquet-Bloch频散分析得到的频散图显示,在瑞利地震波的低频范围内,以及由其他地面振动源(如铁路或道路交通)引起的瑞利地震波的高频范围内,都存在相关的带隙。用有限水箱阵列进行的土域频域分析验证了带隙,并显示出相当大的衰减。所提出的超屏障的一个吸引人的特征是水箱谐振单元可以通过改变水位来调谐;事实上,通过这种方式,可以改变带隙的打开频率和大小。这是替代地震超材料的一个显著优势,一般来说,这些材料的设计不是可调的。所有的计算都在COMSOL Multiphysics中实现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seismic metamaterials for Rayleigh wave attenuation: A novel concept of soil-embedded water-tank metabarrier
In the context of ongoing research on seismic metamaterials, this paper proposes a novel metabarrier for seismic Rayleigh wave attenuation, conceived as a periodic array of soil-embedded cylindrical water tanks acting as resonant units below the soil surface. A theoretical framework is developed, where the dynamics of the water tank is treated by a classical 3D linear, pressure-based model for fluid-structure interaction under earthquake and the soil is idealized as homogeneous and isotropic medium, in agreement with similar studies on seismic metamaterials. The dispersion diagram obtained from the Floquet–Bloch dispersion analysis exhibits relevant band gaps in the low frequency range of seismic Rayleigh waves, as well as in the higher frequency range of Rayleigh waves caused by other ground vibration sources as, e.g., railway or road traffic. Frequency-domain analyses of a soil domain with a finite array of water tanks validate the band gaps and show considerable attenuation. An appealing feature of the proposed metabarrier is that the water-tank resonant units can be tuned by varying the water level; indeed, it is shown that, in this manner, opening frequencies and sizes of the band gaps can be changed. This is a remarkable advantage over alternative seismic metamaterials that, in general, are not designed to be tunable. All calculations are implemented in COMSOL Multiphysics.
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来源期刊
CiteScore
6.70
自引率
8.30%
发文量
405
审稿时长
70 days
期刊介绍: The International Journal of Solids and Structures has as its objective the publication and dissemination of original research in Mechanics of Solids and Structures as a field of Applied Science and Engineering. It fosters thus the exchange of ideas among workers in different parts of the world and also among workers who emphasize different aspects of the foundations and applications of the field. Standing as it does at the cross-roads of Materials Science, Life Sciences, Mathematics, Physics and Engineering Design, the Mechanics of Solids and Structures is experiencing considerable growth as a result of recent technological advances. The Journal, by providing an international medium of communication, is encouraging this growth and is encompassing all aspects of the field from the more classical problems of structural analysis to mechanics of solids continually interacting with other media and including fracture, flow, wave propagation, heat transfer, thermal effects in solids, optimum design methods, model analysis, structural topology and numerical techniques. Interest extends to both inorganic and organic solids and structures.
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