Damage detection at the web/flange junction of welded I-section steel beam based on the impact-optic technique

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (24) : 123-130.

XU Ying，NIU Li，ZU Hongguang

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Abstract

Welded I-section steel members are widely used in engineering, and it is prone to fatigue damage at the web/flange junction under cyclic load.Due to the sudden damage and the heavy losses, it is necessary to detect the damage in time.Based on the study of stress wave propagation mechanism in steel beam, a broadband impact wave was generated by a hammer striking on the surface of a steel Ⅰ-beam, and the fiber interferometer was attached to the surface of steel beam to receive the stress wave signal.By analyzing the impact echo signal spectrum, the existence and location of the damage was determined.Numerical analysis and experimental results show that it is feasible to detect the fatigue damage at the flange/web junction of the steel Ⅰ-beam by the impact-optic method.

Key words

/ impact-echo, fiber interferometer, frequency spectrum, fatigue damage, FFT

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XU Ying，NIU Li，ZU Hongguang. Damage detection at the web/flange junction of welded I-section steel beam based on the impact-optic technique[J]. Journal of Vibration and Shock, 2018, 37(24): 123-130

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