四川轻化工大学学报（自然科学版）2026，Vol.39Issue(1)：62-71,10.DOI:10.11863/j.suse.2026.01.07
临近固定边界处混凝土柱冲击回波响应研究
Research on the Impact Echo Response of Concrete Columns Near Fixed Boundaries
摘要
Abstract
The accuracy of the impact-echo method is easily influenced by structural boundary conditions.For cylindrical structures,a significant shift in resonant frequency occurs near the fixed boundary areas.To investigate the cause of this frequency shift,ensemble empirical mode decomposition(EEMD)is used to analyze the impact-echo signals from field tests and numerical simulations.The results show that the resonant frequency in the central area of a 700 mm square cross-section column is 2.563 kHz,which is consistent with the theoretical thickness frequency;at the fixed boundary,the resonant frequency is 5.248 kHz,which aligns with the characteristic values of the cross-sectional vibration modes.The cross-sectional vibration modes dominate in the echo signals at the fixed boundaries,causing the frequency shift.It is noteworthy that the intrinsic mode functions(IMFs)of P-wave signals,free from surface waves and noise interference,can be obtained at different locations.Additionally,processing the IMF,which is derived from the decomposition of the original signal and represents the P-wave signal,can yield frequency information related to thickness,which is not affected by the boundary conditions of the column.By comparing this frequency with the thickness frequency theoretically calculated,the structural integrity can be verified.This method shows promise for the internal defect detection in the boundary areas of concrete columns.关键词
框架柱/冲击回波法/边界效应/集合经验模态分解/模态振动Key words
frame column/impact-echo method/boundary effects/ensemble empirical mode decomposition/modal vibration分类
交通工程引用本文复制引用
黄锦陶,刘运林..临近固定边界处混凝土柱冲击回波响应研究[J].四川轻化工大学学报（自然科学版）,2026,39(1):62-71,10.基金项目
安徽省住房城乡建设科学技术计划项目(2022-RK057) （2022-RK057）
安徽省高校省级自然科学研究项目(KJ2020ZD43) （KJ2020ZD43）
