Yuki SATO
Study on Application of Magnetic Stress Sensor to Stress Monitoring for Steel Bridges
Masatsugu NAGAI
Recently, a lot of accidents of steel bridges have been reported not only in overseas but also in Japan. As conventional maintenance techniques, visual inspection or hammer tone method have been conducted. However, they are qualitative, and tend to be subjective. Hence, quantitative and effective maintenance techniques are strongly needed.
The objective of this study is to examine the application of a magnetic stress sensor, which makes possible to measure absolute stress nondestructively, to stress monitoring for steel bridges.
At first, the accuracy of calibration curves needed in the magnetic sensor was examined under uni-axial tensile test using various test pieces.
Then, new calibration method without being influenced from lift-off, which is the distance between the sensor and measured surface, was proposed.
Finally, on-site measurement using the magnetic sensor was conducted for steel bridges in order to evaluate applicability.
As a result, it was found that the magnetic sensor had enough applicability to stress monitoring for steel bridges using the proposed method.
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