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<p>To effectively attenuate environmental vibration impact on underground protective structures, laminated toroidal metastructures (LTMs) composed of stiff concrete layers and thin soft rubber layers were proposed, and scaled metastructure models were constructed. Frequency sweep tests (FTS) and finite element simulations were conducted to investigate their wave attenuation performance. The results indicate that the scaled metastructure models exhibit excellent vibration attenuation characteristics, primarily due to the laminated stiff-soft configuration and local resonance mechanisms. A slight reduction in the thickness of the rubber layer has minimal effect on the damping performance, whereas increasing the thickness of the innermost concrete layer significantly enhances the attenuation bandwidth. Moreover, under the condition of a constant total specimen thickness and identical inner concrete layer thickness, increasing the number of LTMs layers effectively improves low-frequency vibration attenuation and enhances the overall vibration damping performance. This research provides a promising underground protective structure with excellent wave attenuation.</p>

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Laminated Toroidal Metastructure for Wave Attenuation: Scaled Model and Experimental Research

  • 期刊论文

  • 发表日期：

    2025年7月19日

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  • Sanfeng Liu,
  • Xuanxuan Hou,
  • Hualin Fan

摘要

To effectively attenuate environmental vibration impact on underground protective structures, laminated toroidal metastructures (LTMs) composed of stiff concrete layers and thin soft rubber layers were proposed, and scaled metastructure models were constructed. Frequency sweep tests (FTS) and finite element simulations were conducted to investigate their wave attenuation performance. The results indicate that the scaled metastructure models exhibit excellent vibration attenuation characteristics, primarily due to the laminated stiff-soft configuration and local resonance mechanisms. A slight reduction in the thickness of the rubber layer has minimal effect on the damping performance, whereas increasing the thickness of the innermost concrete layer significantly enhances the attenuation bandwidth. Moreover, under the condition of a constant total specimen thickness and identical inner concrete layer thickness, increasing the number of LTMs layers effectively improves low-frequency vibration attenuation and enhances the overall vibration damping performance. This research provides a promising underground protective structure with excellent wave attenuation.