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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Metabarriers with multi-mass locally resonating units for broad band Rayleigh waves attenuation
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Metabarriers with multi-mass locally resonating units for broad band Rayleigh waves attenuation

机译：带有多质量局部谐振单元的元势垒，用于宽带瑞利波衰减

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摘要

Artificial soils engineered with periodic or resonant structures, also referred as “seismic metamaterials” have been investigated for earthquake mitigation applications. In particular, an array of sub-wavelength single-mass resonators buried close the soil surface, namely the metabarrier, has been recently proposed to attenuate the ground motion induced by Rayleigh seismic waves. Here we demonstrate that the use of multi-mass resonators allows for enhanced performances of the metabarrier, in terms of amount and bandwidth of ground motion attenuation, with a smaller array of resonators. To this aim, after reviewing the single-mass metabarrier, we describe the dynamic of a multi-mass metabarrier using analytical and numerical approaches. In particular, we provide a detailed study of a metabarrier with double-mass resonators and compare its performances with those of a single-mass metabarrier with equivalent overall mass. Finally, we exploit Genetic Algorithms to design a metabarrier with multi-mass resonators with minimal mass and able to target selected frequencies. As a case study, the fundamental frequencies of two concrete-frame buildings of known dynamic properties are considered. The example shows the possibility to protect multiple buildings from Rayleigh waves with more compact metabarriers.
机译：已经研究了具有周期性或共振结构的人工土壤，也称为“地震超材料”，用于减震应用。特别地，近来已经提出了掩埋在土壤表面附近的亚波长单质量谐振器的阵列，即亚势垒，以衰减由瑞利地震波引起的地震动。在这里，我们证明了使用多质量谐振器可以在较小的谐振器阵列的情况下，在地震动衰减的数量和带宽方面提高元屏障的性能。为此，在回顾了单质元势垒后，我们使用分析和数值方法描述了多质元势垒的动力学。特别是，我们对带有双质量谐振器的超分子屏障进行了详细研究，并将其性能与整体质量相等的单质量超分子屏障进行了比较。最后，我们利用遗传算法设计具有最小质量且能够以选定频率为目标的多质量谐振器的元势垒。作为案例研究，考虑了两个具有已知动态特性的混凝土框架建筑物的基频。该示例显示了使用更紧凑的超屏障来保护多座建筑物免受瑞利波袭击的可能性。

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