摘要
超材料混凝土是具有弹性波带隙特性的新型复合材料,但因较高的带隙频率和较窄的带隙宽度使其在以低频振动控制为主的工程应用上受到很大限制.首先,本文基于局域共振理论,提出了一种新型三组元水泥基拟声子晶体模型,据此研发出拟声子晶体超材料混凝土.其次,计算和分析了拟声子晶体超材料混凝土的能带结构、带隙机理和频率响应函数,并开展了拟声子晶体超材料混凝土的室内试验.最后,用研发出的拟声子晶体超材料混凝土制备了拟声子晶体超材料混凝土地铁道床,并应用到实际地铁工程中以解决地铁运营过程中产生的低频振动问题.结果表明,拟声子晶体超材料混凝土在200 Hz频段内打开了6个低频带隙,在带隙频率范围内,衰减值大多都在10 dB以上,衰减效果较好;拟声子晶体超材料混凝土地铁道床在200 Hz频段内具有显著的低频减振效果,隧道壁三分之一倍频程插入损失的最大值为13.22 dB,隧道壁铅垂向最大Z振级差值为5.052 dB,隧道壁铅垂向最大分频振级差值为5.926 dB,4~200 Hz频段内铅垂向分频振级差值平均值为5.74 dB,低频减振效果明显.本文的相关研究成果为地铁工程和其他工程建设中解决低频振动难题提供了新的技术途径,突破了土木工程结构的传统减振控制技术.
Metamaterial concrete is a new type of composite material with elastic wave bandgap characteristics,but its high bandgap frequency and narrow bandgap width limit its application in engineering mainly focused on low-frequency vibration control.Firstly,based on the theory of local resonance,this paper proposes a novel three-component cement-based phononic-like crystal model,and develops a phononic-like crystal metamaterial concrete based on this model.Secondly,the band structure,bandgap mechanism,and frequency response function of phononic-like crystal metamaterial concrete are calculated and analyzed,and indoor tests of phononic-like crystal metamaterial concrete are conducted.Finally,a phononic-like crystal metamaterial concrete subway track bed is prepared using the developed phononic-like crystal metamaterial concrete,and applied to practical subway engineering to solve the lowfrequency vibration problem generated during subway operation.The results show that the phononic-like crystal metamaterial concrete opens 6 low-frequency bandgaps in the 200 Hz frequency band,and within the bandgap frequency range,the attenuation values are mostly above 10 dB,indicating a good attenuation effect.The phononic-like crystal metamaterial concrete subway track bed has a significant low-frequency vibration reduction effect in the 200 Hz frequency band.The maximum value of one-third octave insertion loss of the tunnel wall is 13.22 dB,the maximum vertical Z-vibration level difference of the tunnel wall is 5.052 dB,the maximum vertical frequency division vibration level difference of the tunnel wall is 5.926 dB,and the average vertical frequency division vibration level difference of the 4–200 Hz frequency band is 5.74 dB.The low-frequency vibration reduction effect is obvious.The relevant research results of this paper provide a new technical approach to solving the problem of low-frequency vibration in subway engineering and other engineering construction,breaking through the traditional vibration reduction control technology of civil engineering structures.
作者
肖鹏
缪林昌
郑海忠
雷利剑
XIAO Peng;MIAO LinChang;ZHENG HaiZhong;LEI LiJian(Institute of Geotechnical Enginering,School of Transportation,Southeast University,Nanjing 211189,China)
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2024年第9期1821-1836,共16页
Scientia Sinica(Technologica)
基金
国家自然科学基金项目(批准号:52173248,51578147)资助。
关键词
拟声子晶体模型
拟声子晶体超材料混凝土
局域共振理论
低频带隙
地铁道床
减振性能
phononic-like crystal model
phononic-like crystal metamaterial concrete
locally resonant theory
low frequency bandgap
subway track bed
vibration reduction performance
