摘要
本文建立了混凝土超材料原胞有限元模型,探讨了谐振骨料的形状、材料参数、几何参数和材料组成等设计参数对原胞带隙特性及调控规律的作用机制,并针对关键设计参数进行了评估与讨论,提出了谐振骨料的设计原则。结果表明:谐振骨料的形状和放置方向均对混凝土超材料原胞的带隙范围有显著影响,建议采用球形作为混凝土超材料原胞的谐振骨料形状;仅通过调整包裹层的弹性模量和泊松比,无法同时获得低频带隙和宽带隙,设计原则应侧重于通过降低包裹层弹性模量和泊松比来获得低频带隙,再通过调整散射体密度和谐振骨料几何参数来实现更宽的带隙范围;对于100 Hz以下的低频振动,包裹层材料推荐选用聚氨酯泡沫,散射体材料则选用铅;此外,还需通过增大包裹层厚度使混凝土超材料原胞产生低频带隙,增大谐振骨料的填充率使其产生宽带隙。
In this paper,a finite element model of the metaconcrete cell was established to analyze the effects of design parameters,including the shape,material parameters,geometric parameters,and material composition of the resonant aggregates,on the bandgap characteristics and regulation laws of the metaconcrete cell.The key design parameters were evaluated and discussed,and design principles of resonant aggregates were proposed.The results show that the bandgap region of the metaconcrete cell is influenced by the shape and orientation of the resonant aggregate.It is suggested that the spherical shape should be used as the resonant aggregate shape of the metamaterial cell.For the metaconcrete cell,achieving a low-frequency bandgap and wide bandgap cannot be accomplished solely by adjusting the elastic modulus and Poissons ratio of the soft coating.The design principles should focus on reducing the elastic modulus and Poissons ratio of the soft coating to obtain a low-frequency bandgap,and then adjusting the resonator density and resonant aggregate geometry parameters to achieve a wider bandgap range.For low-frequency vibration below 100 Hz,it is recommended to use polyurethane foam as the soft coating material and lead as resonator material.Furthermore,increasing the thickness of the soft coating is necessary to create a low-frequency bandgap,and increasing the filling rate of resonant aggregates is crucial for generating a wide bandgap.
作者
陈俊豪
陈国东
曾晓辉
龙广成
谢友均
CHEN Junhao;CHEN Guodong;ZENG Xiaohui;LONG Guangcheng;XIE Youjun(College of Architectural and Engineering,Neijiang Normal University,Neijiang 641000,China;School of Civil Engineering,Central South University,Changsha 410000,China;Infrastructure Department,Hainan University,Haikou 570100,China)
出处
《硅酸盐通报》
北大核心
2025年第7期2474-2486,共13页
Bulletin of the Chinese Ceramic Society
基金
国家重点研发计划(2023YFB2604300)
国家自然科学基金(52078490)
内江市基础研究与应用基础研究项目(2024NJJCYJNJSY014)
内江师范学院大学生创新创业训练计划资助项目(X2024072)。
关键词
混凝土超材料
原胞
谐振骨料
带隙
设计参数
设计原则
metaconcrete
cell
resonant aggregate
bandgap
design parameter
design principle
