Hierarchical large-scale elastic metamaterials for passive seismic wave mitigation
Hierarchical large-scale elastic metamaterials for passive seismic wave mitigation
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DOI：
10.1051/epjam/2021009
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发表时间：
2021-06-08
影响因子：
1.6
通讯作者：
Pugno, Nicola Maria
中科院分区：
文献类型：
--
作者：
Miniaci, Marco;Kherraz, Nesrine;Pugno, Nicola Maria
近年来，大规模弹性超材料因其作为地震波被动隔震结构的潜力而引起科学界越来越大的兴趣。特别是，在其他隔震策略(如阻尼器)不可行的情况下，提出了所谓的“地震屏障”来保护大片区域。在这项工作中，我们研究了一种基于单元分层设计的创新设计的可行性，即具有在不同尺度上重复的自相似几何的结构。结果表明，分层结构的引入使得单胞的概念在保持相同或改进的隔震效率的同时，相对于波长表现出较小的尺寸，以满足地震工程的需要。这使得更接近于这种地震屏蔽的实际实现，其中低频操作和可接受的大小都是可行性的基本特征。
Large scale elastic metamaterials have recently attracted increasing interest in the scientific community for their potential as passive isolation structures for seismic waves. In particular, so-called "seismic shields" have been proposed for the protection of large areas where other isolation strategies (e.g. dampers) are not workable solutions. In this work, we investigate the feasibility of an innovative design based on hierarchical design of the unit cell, i.e. a structure with a self-similar geometry repeated at different scales. Results show how the introduction of hierarchy allows the conception of unit cells exhibiting reduced size with respect to the wavelength while maintaining the same or improved isolation efficiency at frequencies of interest for earthquake engineering. This allows to move closer to the practical realization of such seismic shields, where low-frequency operation and acceptable size are both essential characteristics for feasibility.