Abstract: In order to broaden the elastic wave attenuation band of metaconcrete, a multiple resonant cement-based phononic crystal was proposed based on the local resonance theory. Using the finite element method, the energy band structure, eigenmodes and attenuation characteristics of the multiple resonant cement-based phononic crystal were calculated, the generation mechanism and the influence law of its band gap was studied, the band gap estimation formula was derived from the mass-spring system, and the vibration reduction performance of the metaconcrete filling layer structure was analyzed. The results showed that the multiple resonant cement-based phononic crystal had two band gaps in the 400 Hz, where the starting and cut-off frequencies of the band gaps were determined by the vibration modes of resonator I, resonator II, and cement mortar matrix. The elastic modulus, Poisson's ratio and thickness of the soft coating were the main factors affecting the band gap. The acceleration level of the metaconcrete filling layer structure composed of multiple resonant cement-based phononic crystals in the frequency band of 1—400 Hz was smaller than that of the ordinary self-compacting concrete filling layer structure, especially in the band gap frequency band, the vibration was reduced by 6—9 dB.
通讯作者:
*曾晓辉,中南大学土木工程学院教授、博士研究生导师。2004年华东冶金学院无机非金属材料科学与工程专业本科毕业,2007年中国建筑材料科学研究总院材料科学与工程专业硕士毕业,2010年中南大学土木工程材料专业博士毕业,2018年到中南大学工作至今。目前主要从事混凝土超材料、高性能混凝土材料等方面的研究工作。发表论文100余篇,包括Resources、Conservation and Recycling、Journal of Cleaner Production、Cement and Concrete Composites、《硅酸盐学报》等。zxhzlh@126.com
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2024, Vol. 38 
