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Debonding Detection in Grouted Sleeves Using Axisymmetric Longitudinal Guided Waves
Jiahe Liu1,2, Dongsheng Li1,2, Xiushi Cui1,2
1School of Civil Engineering, Dalian University of Technology, Dalian 116024, China.
Sensors (Basel, Switzerland)
|November 25, 2023
Summary
A new guided-wave structural health monitoring (SHM) method effectively detects debonding in grouted sleeves (GSs). The arrival time of wave packets decreases linearly with increasing debonding size, offering a reliable detection approach.
Area of Science:
- Civil Engineering
- Materials Science
- Structural Health Monitoring
Background:
- Grouted sleeves (GSs) are crucial precast joints for connecting steel rebars.
- Debonding in GSs, often caused by glue plug leakage, significantly degrades structural performance.
- Existing methods for detecting GS debonding are limited.
Purpose of the Study:
- To develop and validate a guided-wave-based structural health monitoring (SHM) method for detecting debonding in GSs.
- To investigate the relationship between wave propagation characteristics and debonding size.
- To provide a reliable method for assessing the integrity of GS multilayer structures.
Main Methods:
- Utilized guided wave propagation, specifically the axisymmetric longitudinal mode, for SHM.
- Employed eight symmetrically placed piezoelectric transducers (PZTs) for wave actuation and signal reception.
- Investigated four GS samples with varying debonding sizes.
- Performed theoretical derivation, numerical simulations, and experimental validation.
Main Results:
- Established a theoretical relationship between wave packet arrival time and debonding size.
- Demonstrated that arrival time decreases linearly with increasing debonding size.
- Validated the findings through numerical simulations and experimental tests, showing consistent trends.
Conclusions:
- The guided-wave-based SHM method is effective for detecting and quantifying debonding in GSs.
- The linear correlation between arrival time and debonding size provides a quantitative assessment tool.
- This approach offers a valuable reference for monitoring similar multilayer structures.
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