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

被引：0
|
作者：
Li C. [1 ]
Wang Q. [1 ,3 ]
Zhu R. [2 ,3 ]
Hu Y. [1 ]
Wang B. [1 ]
机构：
[1] School of Mathematics, Hohai University, Nanjing
[2] College of Harbor Coastal and Offshore Engineering, Hohai University, Nanjing
[3] MOE Key Lab of Coastal Disaster and Defence, Hohai University, Nanjing
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2024年 / 43卷 / 05期
关键词：
composite energy factor; damage identification; high-piled wharf; signal reconstruction; wave excitation;
D O I：
10.13465/j.cnki.jvs.2024.05.004
中图分类号：
学科分类号：
摘要：
Waves are long-term and important external excitations for pile foundation of high-piled wharf. Exploring damage identification of pile foundation under wave excitation is of great significance for constructing a health monitoring system for wharfs. Dynamic responses of pile foundation under wave excitation present the characteristics of multi-type signals aliasing, narrowband and non-stationary, so existing damage identification methods are difficult to accurately judge them. Here, to solve the above problems, firstly, a signal automatic reconstruction method based on complete ensemble empirical mode decomposition with adaptive noise and K-means ++ was constructed to extract damage feature sub-signals. Then, by integrating information of energy and phase, a new composite energy factor for damage identification was constructed to improve the sensitivity and robustness of damage identification under small wave excitation. Furthermore, wave excitation tests were conducted under various damage conditions for pile foundation of a high-piled wharf to verify the effectiveness of the new method in damage identification. The results showed that the newly constructed composite energy factor can combine advantages of energy and phase, and accurately identify damage presence, damage position and damage degree. © 2024 Chinese Vibration Engineering Society. All rights reserved.
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页码：31 / 40and93
页数：4062
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