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| Experimental research on monitoring the alternating stress of the prestressed steel strand based on the method of magnetic resonance |
| LIU Huiling1,2,ZHANG Hong1,2,ZHANG Senhua1,2,XIA Junfeng1,2,ZHOU Jianting1,2 |
1.State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
2.School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China |
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Abstract The alternating stress of the prestressed steel strand is difficult to measure. In order to clarify the applicability of magnetic resonance method for monitoring the alternating stress of prestressed steel strand, based on the magnetoelastic effect and hysteresis effect, the inductance variation of induction coil induced by tensile strain effect during stress alternation is analyzed, and the steel stranded wire stress monitoring test under the action of the alternation load was carried out. Changes of corresponding sensor induced voltages under different alternating load is researched, the corresponding relationship between the sensor induced voltages and the alternation load is clarified, and the influence mechanism of the alternation load on the sensor induced voltages is revealed. The results show that there is a linear relationship between induced voltage and load, and the stress monitoring error is less than 5%. The magnetic resonance method can monitor the alternating stress of prestressed steel strands.
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Received: 11 July 2022
Published: 28 July 2023
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