3 August 2001 Development of a remote coil magnetoelastic stress sensor for steel cables
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Abstract
Despite the increasing popularity of cable-stayed bridges there is no convenient and accurate means available to measure the forces in the cable stays. The measurement of the forces is important for monitoring excessive wind or traffic loadings, to gage the redistribution forces which may occur after seismic events, and for detecting corrosion via loss of the cross-section. Although magnetoelastic stress sensors have been extensively tested on many types of prestressing cables, and have demonstrated accuracies of < 1%, to-date they have been based upon a solenoid geometry, which is not practical for cable force measurements in existing bridges having hundreds of cables. In order to address this problem a magnetoelastic sensor for the direct measurement of stress in steel cables is currently under development. The sensor differs from previous magnetoelastic sensors in that the cable is magnetized by a removable C- shaped circuit, rather than by a solenoid. We report preliminary results on measurement of the initial permeability curve indicating adequate sensitivity to stress with this geometry, but further work is necessary to understand the influence of the more complicated field geometry on data reduction and calibration procedures.
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Ming L. Wang, George M. Lloyd, Ondrej Hovorka, "Development of a remote coil magnetoelastic stress sensor for steel cables", Proc. SPIE 4337, Health Monitoring and Management of Civil Infrastructure Systems, (3 August 2001); doi: 10.1117/12.435584; https://doi.org/10.1117/12.435584
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