Alternating prestress monitoring of steel strands based on the magnetoelastic inductance method

•The actual prestress variation of the steel strands was considered.•The stress-inductance relationship was explained by the established model.•The unreasonable prestress change can be evaluated by the inductance.•Varied within 10% design prestress, the monitoring error was less than 12.56%.•The con...

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Bibliographic Details
Published in:Measurement : journal of the International Measurement Confederation 2022-05, Vol.194, p.111024, Article 111024
Main Authors: Zhang, Senhua, Zhang, Hong, Zhou, Jianting, Liu, Huiling, Ma, Hu, Liao, Leng
Format: Article
Language:English
Subjects:
Alternating
Deformation
Deformation effects
Hysteresis
Inductance
Magnetic fields
Magnetoelastic inductance method
Magnetostriction
Monitoring
Monitoring systems
Plastic deformation
Prestress
Prestressing
Spectrum analysis
Steel
Steel strand
Strands
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Summary:•The actual prestress variation of the steel strands was considered.•The stress-inductance relationship was explained by the established model.•The unreasonable prestress change can be evaluated by the inductance.•Varied within 10% design prestress, the monitoring error was less than 12.56%.•The conclusions apply to the methods using the inverse magnetostriction effect. Alternating prestress is difficult to measure. By analyzing the inverse magnetostriction effect and the magnetic hysteresis, a theoretical model was established to describe the prestress-inductance relationship. The results of the prestress monitoring experiment showed that the inductance was influenced by the irreversible magnetization, the plastic deformation, and the hysteresis effect. Keeping the stress range constant, the inductance range was unaffected by the number of load cycles. The inductance can be used to judge whether the prestress is reasonable. The parabolic fitting method was employed to establish the mapping from the inductance to the prestress. When the stress range was 10% design prestress or 20% design prestress, the prestress monitoring error, less than 12.56% or 18.77%, was close to the magnetoelastic method and the frequency-based method. Based on the proposed calculation method, the MI method could monitor the alternating prestress of steel strands.
ISSN:0263-2241
1873-412X
DOI:10.1016/j.measurement.2022.111024