Damage identification for pile foundation of high-piled wharf under wave excitation based on response composite energy factor

LI Chengming1,WANG Qiming1,3,ZHU Ruihu2,3,HU Yan1,WANG Bochun1

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (5) : 31-40.

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PDF(4347 KB)
Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (5) : 31-40.

Damage identification for pile foundation of high-piled wharf under wave excitation based on response composite energy factor

  • LI Chengming1,WANG Qiming1,3,ZHU Ruihu2,3,HU Yan1,WANG Bochun1
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Abstract

Waves are long-term and significant external excitations for the pile foundation in high-piled wharves. Identifying damage in pile foundations under wave excitation is crucial for constructing health monitoring systems. The dynamic response under wave excitation exhibits multi-type aliasing, narrow-band and non-stationarity, which pose challenges for accurate damage identification using existing methods. To address the above issues, an automatic reconstruction method based on Complete Ensemble Empirical Mode Decomposition with Adaptive Noise and K-means++ was proposed to extract damage sub-signals. Then, a novel composite energy damage index was constructed to enhance the sensitivity and robustness of damage identification under small wave excitation. Furthermore, wave excitation experiments were conducted on a high-piled wharf model under various damage conditions to verify the effectiveness of the new method in damage identification. The results show that the composite energy factor combines both energy and phase advantages, which can precisely identify the damage’s presence, location and severity.

Key words

damage identification / composite energy factor / high-piled wharf / wave excitation / signal reconstruction

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LI Chengming1,WANG Qiming1,3,ZHU Ruihu2,3,HU Yan1,WANG Bochun1. Damage identification for pile foundation of high-piled wharf under wave excitation based on response composite energy factor[J]. Journal of Vibration and Shock, 2024, 43(5): 31-40

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