A Novel Integrated Sensor for Stress Measurement in Steel Strand Based on Elastomagnetic and Magnetostrictive Effect

Liu, Xiucheng; Wu, Bin; He, Cunfu

doi:10.1007/978-3-319-09507-3_7

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…SHM is the process of continuous monitoring of structural parameters to derive information regarding the performance of a structure. 3 Several parameters have been linked to the magnitude of prestress losses such as natural frequencies of the structure, 4,5 magnetic permeability of the prestressing strands, 6,7 and the stress wave velocity in acoustoelastic methods, 8,9 among others. However, as detailed in a report by joint ACI-ASCE Committee 423 on estimating prestress losses, most successful field applications and large-scale laboratory experiments for monitoring prestress losses are based on strain measurements by means of strain sensors installed on the prestressing strands or other nonprestressed reinforcement embedded in the concrete.…”

Section: Introductionmentioning

confidence: 99%

Monitoring of long-term prestress losses in prestressed concrete structures using fiber optic sensors

Abdel-Jaber

Glišić

2018

Structural Health Monitoring

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This study presents a method for on-site assessment of prestress losses in prestressed concrete structures. The study is motivated by the increased use of prestressed concrete, the importance of prestressing force levels as a parameter, and the lack of formalized methods for its on-site assessment. The proposed method uses strain measurements from long-gauge fiber optic sensors to study strain changes at the centroid of stiffness (i.e. centroid of composite section) of the cross-sections. Its advantages include (1) robustness to operational load on the structure caused by seasonal and daily temperature variations, in addition to loading; (2) rigorous quantification of uncertainties associated with measurements and parameters; and (3) applicability to a wide range of beam-like structures. The application of the method is illustrated through application to measurements collected over a 7-year period from strain sensors embedded in Streicker Bridge, a post-tensioned concrete pedestrian bridge on the Princeton University campus. Application of the method indicates that prestress losses measured by sensors are of comparable magnitude to design estimates, which implies that estimates are not necessarily overly conservative.

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Section: Introductionmentioning

confidence: 99%

Monitoring of long-term prestress losses in prestressed concrete structures using fiber optic sensors

Abdel-Jaber

Glišić

2018

Structural Health Monitoring

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“…A primary coil fed with alternating or pulse current provides a dynamic magnetic field for cable magnetization and the magnetic response of the cable is measured by a secondary coil for tensile force characterization. 7 Feature parameters such as the voltage induced in the secondary coil, 8,9 coercive force, saturated magnetic induction, 10 and the estimated permeability [11][12][13] are used to assess the variation of the cable tension force. The EM methods have been widely applied in the determination of cable tension force through pre-calibration experimental tests 14,15 and field tests.…”

Section: Introductionmentioning

confidence: 99%

Temperature-insensitive cable tension monitoring during the construction of a cable-stayed bridge with a custom-developed pulse elasto-magnetic instrument

Feng

Liu

et al. 2018

Structural Health Monitoring

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Pulse elasto-magnetic method has numerous applications for monitoring cable tension force in cable-stayed bridges. In conventional pulse elasto-magnetic measurements, the feature parameters in frequency domain are seldom discussed. In this study, attempts are made to seek new parameters in frequency domain which are mainly influenced by cable tension force and less sensitive to temperature. A custom-developed pulse elasto-magnetic instrument is employed to conduct cable tension monitoring in the construction stage of a cable-stayed bridge. The field testing results show that only after temperature compensation, the monitoring results of the feature parameters extracted from the magnetic characteristic curve can reflect the stepped changes of cable tension force. Surprisingly, a new frequency-domain parameter, the summation of spectra amplitudes in a carefully selected frequency range, is found to be insensitive to temperature and can well reflect the stepped change behavior of cable tension force. The feasibility of this temperature-insensitive parameter for cable force measurements was verified by field test in two stay cables. The averaged value of the new parameter at each stage linearly depends on cable tension force. The findings about the new frequency-domain parameter may facilitate temperature-insensitive cable tension monitoring in cable-stayed bridge with a pulse elasto-magnetic instrument.

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An NCFA-Based Notch Frequency Feature Extraction Method for Guided Waves and Its Application in Steel Strand Tension Detection

Cui,

Li,

Liu

et al. 2023

J. Bridge Eng.

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A Novel Integrated Sensor for Stress Measurement in Steel Strand Based on Elastomagnetic and Magnetostrictive Effect

Cited by 4 publications

References 11 publications

Monitoring of long-term prestress losses in prestressed concrete structures using fiber optic sensors

Monitoring of long-term prestress losses in prestressed concrete structures using fiber optic sensors

Temperature-insensitive cable tension monitoring during the construction of a cable-stayed bridge with a custom-developed pulse elasto-magnetic instrument

An NCFA-Based Notch Frequency Feature Extraction Method for Guided Waves and Its Application in Steel Strand Tension Detection

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