|Table of Contents|

Concrete shear failure test based on acoustic emission technology(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2026年01期
Page:
129-141
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Concrete shear failure test based on acoustic emission technology
Author(s):
HUANG Lian1;  NONG Li-jun1;  LIU Yun2*;  WANG Shuo3;  YUAN Sheng2;  SHI Liu4
(1. School of Engineering and Architecture, Guangxi Minzu Uiniversity, Nanning 530006, Guangxi, China; 2. Institute of Road and Bridge Engineering, Hunan Communication Polytechnic, Changsha 410132,Hunan, China; 3. School of Civil and Environmental Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China; 4. School of Architectural Engineering,Hunan Sany Polytechnic College, Changsha 410100, Hunan, China)
Keywords:
bridge engineering;  concrete;  shear failure;  acoustic emission parameter;  RA-AF analysis;  b-value analysis
PACS:
U445.7
DOI:
10.19721/j.cnki.1671-8879.2026.01.010
Abstract:
To explore the acoustic emission characteristics of concrete during the process of shear damage and failure, direct shear and compression shear failure tests were conducted on Z-shaped specimens. A combination of various acoustic emission parameter analysis methods was employed, including variation curves of cumulative energy, amplitude and counts over time, count-amplitude, rise angle(RA)-average frequency(AF), and b-value analysis. The acoustic emission characteristics of concrete during shear damage and failure were elucidate. The research findings indicate that due to the horizontal force constraint, the compression shear specimens exhibit higher bearing capacities, greater internal damage and deterioration within the material, and more active acoustic emission signals. For all specimens, during the initiation stage of microcracks, the amplitudes of acoustic emission signals are concentrated within 80 dB and the counts are below 200. While during the formation, propagation, and macrocrack stages of shear cracks, the amplitudes exceed 80 dB, and this characteristic is independent of the loading type. The numbers of shear crack elements exceed 80% for all specimens, significantly greater than the total number of tensile crack elements, indicating that cracks produced in each specimen are mainly shear cracks. Moreover, the AF and RA at the clustering centers range between 20-40 kHz and 0.3-0.6 s/V, respectively. During vertical loading process, the b-value of compression shear specimens exhibit three-stage failure characteristics. In the initial stage, the b-value is high and the amplitude is below 70 dB. During the stable damage propagation stage, the b-value data points become dense and fluctuate around 1.4, while this feature is not prominent in the direct shear specimens. During the failure stage, the b-value continues to oscillate and decrease, and there is a significant increase in high-amplitude signals above 80 dB. Furthermore, the first continuous decrease in the b-value indicates the emergence of shear cracks in the concrete material. 10 figs, 32 refs.

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Last Update: 2026-02-20