A PZT-Based Smart Anchor Washer for Monitoring Prestressing Force Based on the Wavelet Packet Analysis Method

Prestressed steel strands in prestressed structures offset or reduce the tensile stress caused by external loads, making them the primary load-bearing components. Great concerns have been raised about prestress monitoring due to the growing use of structural health monitoring (SHM). Piezoceramic (PZ...

Full description

Saved in:
Bibliographic Details
Published in:Applied sciences 2024-01, Vol.14 (2), p.641
Main Authors: Wang, Long, Zhang, Liuyu, Mo, Di, Wu, Xiaoguang
Format: Article
Language:English
Subjects:
Acoustics
Actuators
Analysis
Concrete
Design
Energy dissipation
energy saturation
Entropy
Fractals
Interfaces
Methods
piezoceramic transducers
prestress monitoring
prestressed steel strand
Sensors
Shannon entropy
Stress (Psychology)
Stress concentration
Wave power
wavelet packet energy
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Prestressed steel strands in prestressed structures offset or reduce the tensile stress caused by external loads, making them the primary load-bearing components. Great concerns have been raised about prestress monitoring due to the growing use of structural health monitoring (SHM). Piezoceramic (PZT) active sensing methods are commonly used in this field. However, there appears to be a problem of “energy saturation” in the utilization of piezoceramic active sensing methods. In this study, a smart anchor washer with semi-cylinders was developed to alleviate the saturation problem. An intelligent monitoring system is formed by combining the upper and lower annular cylinders with two piezoelectric patches. The piezoelectric patch on the upper annular cylinder is used as an actuator to emit signals through the contact interface of the smart anchor washer, which are then received by the piezoelectric patch on the lower annular cylinder. Based on wavelet packet decomposition, we investigate the correlation between the energy of the received signal and the applied tension force. Finally, a prestressing force index is developed for monitoring prestressing force using Shannon entropy. It is found that the index decreases with the increase in tension. The proposed design and index are also sensitive to early monitoring of prestressing force and can be used to monitor the entire prestressing process of steel strands.
ISSN:2076-3417
2076-3417
DOI:10.3390/app14020641