|Table of Contents|

Research on Defect Detection and Stress Propagation Simulation of Grouting Sleeve Based on Piezoelectric Ceramics(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年04期
Page:
117-126
Research Field:
Publishing date:

Info

Title:
Research on Defect Detection and Stress Propagation Simulation of Grouting Sleeve Based on Piezoelectric Ceramics
Author(s):
ZHU Hong1;  SUN Yu1;  DONG Zhi-qiang1;  CHEN Dong-dong2;  WU Gang1
(1. Key Laboratory of C&PC Structures of Ministry of Education, Southeast University, Nanjing 211189, Jiangsu, China; 2. College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China)
Keywords:
piezoelectric ceramics;  grouting sleeve;  defect detection;  wave method;  numerical simulation
PACS:
TU317
DOI:
10.19815/j.jace.2021.07108
Abstract:
In order to judge the defects in the grouting sleeve, based on the piezoelectric ceramic detection method, the vertical sleeves and horizontal sleeves with different defect degrees were detected, and the effect of different cross-sectional grouting volume on the amplitude of the response signal was compared. The influence of cross-sectional grouting volume on the signal energy from the perspective of wavelet packet energy was analyzed. Based on the wavelet packet energy analysis, the defect evaluation index was proposed. Through the finite element method, the stress wave propagation in the grouting sleeve with different cross-sectional grouting volumes was simulated, and the influence of the defect size on the stress wave propagation was analyzed. The results show that the amplitude of the response signal increases with the severity of the internal defects of the grouting sleeve, and the average value of the amplitude in the case of complete voiding is 293% of that when the grouting is full. Through wavelet packet energy analysis, the response signal is a low-frequency signal. The defect evaluation index proposed based on wavelet packet energy analysis can quantitatively reflect the degree of internal defects in the grouting sleeve. The finite element simulation results visually show the propagation path of stress waves in the sleeve, and the severity of internal defects will affect the propagation path of the stress wave and the degree of energy dissipation. The smaller the amount of grouting, the larger the internal defects, and the more concentrated the stress wave propagation, and the smaller the final energy loss.

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Last Update: 2022-07-10