Acoustic Emission Mechanisms and Fracture Mechanisms in Reinforced Concrete Beams Under Cyclic Loading and Unloading.

Correspondingly, the spectral skewness of the acoustic emission signals shows an increasing trend, indicating a change in the asymmetry of the signal spectrum shape and a more noticeable shift of the energy distribution toward lower frequencies.

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In the figures, features with p < 0.05 are marked with **, and features with p < 0.1, indicating potentially marginally significant differences, are marked with *.

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It shows a decreasing trend from Stage I to Stage III, consistent with the transition of the fracture mechanism from high-frequency brittle fracture to low-frequency frictional slip.

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