基于响应复合能量因子的波浪激励下高桩码头桩基损伤识别

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

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摘要波浪是高桩码头桩基长期、重要外部激励,探索波浪激励下桩基损伤识别对构建码头健康监测体系具有重要意义。由于波浪激励下桩基动力响应呈现多类型信号混叠、窄带、非平稳的特性,使得现有损伤识别方法难以实现准确判定。为解决上述问题,首先构建基于自适应噪声的完备集成经验模态分解与K-means++的信号自动重构方法,以提取损伤特征子信号;然后,通过融合能量、相位等信息,构建新型复合能量损伤识别指标,以提高微小波浪激励下损伤识别的敏感性和鲁棒性。进一步,在高桩码头桩基多种损伤工况下开展波浪激励试验,验证新方法在损伤识别方面的有效性。结果表明,新构建的复合能量因子兼顾能量、相位的优点,能准确识别出损伤存在、损伤位置和损伤程度。 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.

作者李成明王启明朱瑞虎胡艳王泊淳 LI Chengming;WANG Qiming;ZHU Ruihu;HU Yan;WANG Bochun(School of Mathematics,Hohai University,Nanjing 211100,China;College of Harbor Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China;MOE Key Lab of Coastal Disaster and Defence,Hohai University,Nanjing 210098,China)

机构地区河海大学数学学院河海大学港口海岸与近海工程学院河海大学海岸灾害及防护教育部重点实验室

出处《振动与冲击》 EI CSCD 北大核心 2024年第5期31-40,93,共11页 Journal of Vibration and Shock

基金国家重点研发计划(2022YFB3207400) 国家自然科学基金项目(51709093) 江苏省研究生科研与实践创新计划(422003263)。

关键词损伤识别复合能量因子高桩码头波浪激励信号重构 damage identification composite energy factor high-piled wharf wave excitation signal reconstruction

分类号 TU317 [建筑科学—结构工程]