Abstract
Effective prestress change detection has a guiding effect on the safety of prestressed concrete structures. The measurement method of inductance–capacitance (LC) electromagnetic oscillation circuit can directly reflect the correlation between the stress of the steel strands and the electromagnetic resonance frequency. In this paper, the post-tensioned unbonded prestressed steel strands inside the structure are treated as a helical coil. Combined with the inductance characteristics of the helical coil in the resonance circuit and the characteristics of stress in the prestressed structure, the relationship between the load and the stress of the structure under vertical loading is analyzed. A function model of the stress and resonance frequency in the LC oscillation circuit is established. Then a 4.8 m long unbonded prestressed concrete beam is used for 0–55 kN vertical loading experiments and the electromagnetic resonance circuit is completed to detect the change of the resonance frequency increment of the steel strands with the measured stress increment. Theoretical analysis and experimental results show that the electromagnetic resonance circuit can effectively detect structural load stress changes that are positively related to the electromagnetic resonance frequency of the steel strands.
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