负泊松比局域共振型地震超材料隔震屏障

扫码查看

原文链接

万方数据

中文摘要：近几十年来，地震超材料在保护土木工程基础设施免受地震破坏方面的应用受到了广泛关注。尤其是局域共振地震超材料的提出，为使用小尺寸隔离屏障实现低频地震波隔离提供了可能。然而，以往的研究中，未考虑局域共振地震超材料的能量吸收特性。利用负泊松比(NPR)超材料良好的能量吸收特性，将局域共振的地震超材料与NPR超材料结合，创造性地设计了一种新的地震超材料结构，以隔离地震波。采用声锥技术结合透射谱从混合波中识别表面波。详细讨论了频率带隙的产生机制和所提出的地震超材料的隔震效果。结果表明，超材料结构在0。65 Hz-18。9Hz范围内产生的超低、超宽频带隙主要是由于地震超材料结构的局域共振和能量吸收所致，通过将表面波转换为体波获得了良好的隔振效果。随着每个谐振器之间距离的增加，频率带隙变窄。此外，NPR垫层的泊松比、密度和弹性模量等力学性能对频率带隙有显著影响，特别是对上限频率(UBF)的影响更大。在实际工程中，负泊松比局域共振地震超材料结构的设计建议选择负泊松比值、密度及弹性模量均较小的负泊松比材料。对实际地震波的时域分析表明，该材料在隔离超低、超宽频率地震波方面具有良好的应用前景，隔振效果大于70％。这项工作为局域共振地震超材料隔离低频地震波提供了一种新的设计思想。

外文标题：Negative Poisson's ratio locally resonant seismic metamaterials vibration isolation barrier

外文摘要：In recent decades,the application of seismic metamaterials to protect civil infrastructures being free of the damage of earthquakes has been attracting extensive attention.Specifically,the proposed locally resonant seismic metamaterials provide the probability of isolating the low-frequency seismic wave using a small-size isolation barrier.However,in previous studies,the energy absorption properties of locally resonant seismic metamaterials remain one of the least understood aspects of isolation.Benefit from the fascinating energy absorption characteristic of negative Poisson ratio(NPR)metamaterial,we creatively design a new seismic metamaterial structure by assembling the locally resonant seismic metamaterial and NPR metamaterial,to isolate seismic waves.The sound cone technique combining the transmission spectrum is employed to identify the surface wave from the hybrid waves.The generation mechanism of frequency bandgap and the isolation effectiveness of the proposed seismic metamaterial are discussed in detail.The results indicate that the generation of ultra-low and ultra-wide frequency bandgap with the range of 0.65 Hz-18.9 Hz is attributed to the locally resonant and energy absorption of the proposed seismic metamaterial structure and the excellent isolation effect is achieved by transforming the surface wave into the bulk wave.The frequency bandgap narrows as the distance increases between each resonator.In addition,the mechanical properties of the NPR bearing,such as the Poisson ratio,mass density,and elastic modulus,have remarkable impact on the frequency bandgap,especially on the upper bound frequency.In practical engineering,the NPR bearing with a low Poisson ratio,small mass density,and high elastic modulus is suggested for the design of the NPR locally resonant seismic meta-material structures.Time domain analysis for the practical seismic wave verifies that the proposed seismic metamaterial has a promising application in isolating ultra-low and ultra-wide seismic waves,with the isolation effectiveness larger than 70％.This work contributes a new locally resonance seismic metamaterial design idea for isolating and adjusting the low-frequency seismic wave.

外文关键词：

Seismic metamaterialsLocally resonantNegative Poisson ratio(NPR)Seismic wavesFrequency bandgapVibration isolation barrier

作者：

丁海滨、黄年勇、Muhammad、徐长节、童立红

展开 >

作者单位：

State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,Nanchang 330013,China

Institute of Geotechnical Engineering,School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China

Department of Mechanical,Manufacturing and Biomedical Engineering,Trinity College Dublin,Dublin D02PN40,Ireland

Department of Mechanical Engineering,University of Galway,University Road,Galway H91 HX31,Ireland

展开 >

关键词：

Seismic metamaterials Locally resonant Negative Poisson ratio(NPR) Seismic waves Frequency bandgap Vibration isolation barrier

基金：

National Natural Science FoundationNational Natural Science FoundationNatural Science Foundation of Jiangxi ProvinceNatural Science Foundation of Jiangxi ProvinceEducation Department of Jiangxi ProvinceOpen Project of State Key Laboratory

项目编号：

522083445227835020224BAB21406820212BDH81034GJJ2200673HJGZ2022204

出版年：

2024

DOI：

10.1007/s10409-024-23370-x

力学学报(英文版)

CSTPCD

影响因子：0.363

ISSN：0567-7718

年,卷(期)：2024.40(8)