YU A P, LIU T, LIU L Y, et al． Study on the propagation characteristics of acoustic emission signals from in-service RC columns [J]. Journal of Henan Polytechnic University( Natural Science)， doi: 10.16186/j.cnki.1673-9787.2024080040

doi: 10.16186/j.cnki.1673-9787.2024080040

Received： 2024-08-23

Revised： 2024-10-10

Online： 2026-07-16

Study on the propagation characteristics of acoustic emission signals from in-service RC columns (Online)

YU Aiping1, LIu Tao1, LIU Liyuan1, MIAO Tianjiao1, YU Xiaoping2

1. Guangxi Key Laboratory of Green Building Materials and Construction Industrialization, Guilin University of Technology, Guilin University of Technology，Guilin 541004, Guangxi, China; 2. Guilin University of Technology at Nanning, Chongzuo 532100, Guangxi, China

Abstract: Objectives The complex material parameters and structural forms of in-service RC columns pose significant challenges to the application of acoustic emission technology. To clarify the propagation characteristics of acoustic emission signals in in-service RC columns, this paper conducted acoustic emission detection experiments on in-service RC columns. Methods The attenuation law of acoustic emission signals of RC columns in service at different propagation distances is analyzed by acoustic emission amplitude parameters, energy parameters, center frequency parameters, FFT, WPT. Results The experimental results show that the energy, amplitude and center frequency of acoustic emission signal tend to decay with the increase of propagation distance when the propagation distance is less than 500 mm, and almost no longer decay when the propagation distance is greater than 500 mm. The attenuation coefficient of the energy parameter is 0.0093 by negative exponential fitting. When the signal is propagated to 400 mm, the main component of the wave begins to change dramatically; when it is propagated to 500 mm, the main component of the wave completely changes and the type of the wave changes; and when the propagation distance is greater than 500 mm, the wave received by the sensor contains a large number of noise waves; The main frequency of acoustic emission frequency domain signal gradually shifts from high frequency to low frequency with the increase of propagation distance. When the propagation distance is less than 200 mm, the energy of the high-frequency band signal transfers rapidly to the low-frequency band. In general, the energy proportion of the low-frequency band signal shows a continuous upward trend with the increase of the propagation distance. When the signal reaches 700 mm, the energy proportion of the frequency band 1 reaches 95.98%. Conclusions Low frequency signals are more advantageous in long-distance transmission, while high frequency signals are more easily attenuated. The presence of different wave types poses challenges to the detection of acoustic emissions, necessitating that the received signal by the sensor corresponds to the same wave type. Therefore, during acoustic emission detection of RC columns in service, it is recommended to maintain an arrangement distance between adjacent sensors not exceeding 400 mm and not surpassing 500 mm.

Key words: in-service RC columns; attenuation; amplitude; energy; FFT; WPT