Double-gradient seismic metamaterials with zero-frequency bandgap characteristic in a layered soil medium

IF 1.8 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

EPL Pub Date : 2023-10-01 DOI:10.1209/0295-5075/ad04ee

Nannan Shi, Han Liu, Lihui Wang, Jinbao Ji, Zhenbao Li, Shui Guo, Jian Wang

引用次数: 0

Abstract

Abstract Seismic metamaterials (SMs) are an artificially composite material designed within the sub-wavelength range. To attenuate low-frequency seismic surface waves, a metamaterial structural unit composed of a lead core and an auxetic foam coating layer was proposed; the higher impedance ratio results in the creation of a zero-frequency bandgap under layered soil conditions. To broaden the attenuation zone (AZ), double-gradient seismic metamaterials (DGSMs) were designed. The frequency domain analysis indicates that the attenuation area covering the range of 0–10 Hz is 89.8%. Through displacement-field analysis, the attenuation mechanism of DGSM on specific frequency surface waves can be fully explained. Finally, Taft seismic wave excitation is input for time history analysis, and the acceleration amplitude within 0–2 Hz decreases by 58.6%, which verifies the effectiveness of DGSMs in attenuation of low-frequency seismic waves.

查看原文本刊更多论文

层状土介质中具有零频带隙特性的双梯度地震超材料

摘要地震超材料是一种在亚波长范围内设计的人工复合材料。为了对低频地震表面波进行衰减，提出了一种由铅芯和增氧泡沫涂层组成的超材料结构单元;较高的阻抗比导致在层状土壤条件下产生零频率带隙。为了拓宽衰减带，设计了双梯度地震超材料(DGSMs)。频域分析表明，在0 ~ 10hz范围内的衰减面积为89.8%。通过位移场分析，可以充分解释DGSM对特定频率表面波的衰减机理。最后，输入塔夫脱地震波激励进行时程分析，0 ~ 2 Hz范围内的加速度幅值减小58.6%，验证了DGSMs对低频地震波衰减的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

EPL 物理-物理：综合

CiteScore

3.30

自引率

5.60%

发文量

332

审稿时长

1.9 months

期刊介绍： General physics – physics of elementary particles and fields – nuclear physics – atomic, molecular and optical physics – classical areas of phenomenology – physics of gases, plasmas and electrical discharges – condensed matter – cross-disciplinary physics and related areas of science and technology. Letters submitted to EPL should contain new results, ideas, concepts, experimental methods, theoretical treatments, including those with application potential and be of broad interest and importance to one or several sections of the physics community. The presentation should satisfy the specialist, yet remain understandable to the researchers in other fields through a suitable, clearly written introduction and conclusion (if appropriate). EPL also publishes Comments on Letters previously published in the Journal.

文献相关原料

公司名称	产品信息	采购帮参考价格