不完备模态测试下高桩码头基桩损伤识别方法研究

The foundations piles are the main structures to support superstructures of high-piled wharf. So the foundation pile inspection is an important measure to maintain the safe use of high-piled wharf. Previous researches usually employ low strain reflected wave method based on one-dimensional theory of elastic rods to study high-piled wharf foundation pile inspection methods, however the complex upper structure of the foundation piles shows great three-dimensional effects, which makes low strain method not applicable. The non-destructive testing methods based on the dynamic characteristics are applicable to complex structure patterns. But for the high-piled wharf, test information is incomplete in the actual project and that limits the practical application of damage diagnosis method. To solve this problem, the study research the theory of damage diagnosis method based on the dynamic characteristics for foundation piles of high-piled wharf with incomplete test information. We presume the tested pile as a substructure of high-piled wharf, then research the interfacial force identification methods using incomplete test information from substructure and also research the freedom matching methods on the level of substructure; Based on these, we build damage recognition algorithms to detect the damage of foundation piles submerged in water and mud, finally the validity and recognition accuracy of the algorithms will be examined through physical model. In this study, we try to overcome the difficulties that the interfacial force could not be identified just using incomplete test information from substructure, and establish the freedom matching methods on the level of substructure, in order to establish damage recognition algorithms which can inspect the damage of foundation piles in hidden parts, which provide a new idea and strategy to pile testing.

基桩是支撑高桩码头上部结构的主要受力构件，准确检测基桩完整性是维护码头安全的重要措施。现行高桩码头基桩检测方法，大多采用基于一维弹性杆理论的低应变反射波法，但此方法对于上部存在复杂结构、有明显三维效应的高桩码头基桩并不适用。基于动力特性的无损检测方法，对复杂结构有较好的适用性，但实际工程无法测得完备模态信息，导致在基桩检测应用中受到制约。针对这一问题，为建立不完备模态测试下基于动力特性的高桩码头基桩损伤识别方法，本研究将待测基桩视为高桩码头的子结构，建立仅需子结构上有限测点信息即可识别未知界面力的方法，进而研究子结构水平的自由度匹配方法；基于此，构建能够检测基桩水下及泥下部位损伤的识别算法，并通过物理试验验证与修正。本课题突破子结构测试信息不完备对界面力识别的限制，提出在子结构范畴的自由度匹配方法，建立能够识别基桩隐蔽部位损伤的方法，为基桩检测提供一种新的思路与策略。

基桩是支撑高桩码头上部结构的主要受力构件，准确检测基桩完整性是维护码头安全的重要措施。现行高桩码头基桩检测方法，大多采用基于一维弹性杆理论的低应变反射波法，但此方法对于上部存在复杂结构、有明显三维效应的高桩码头基桩并不适用。基于动力特性的无损检测方法，对复杂结构有较好的适用性，但实际工程无法测得完备模态信息，导致在基桩检测应用中受到制约。针对这一问题，本项目研究不完备模态测试下基于动力特性的高桩码头基桩损伤识别方法。通过理论分析、物理模型试验等开展环境激励下高桩码头模态参数识别方法、高桩码头基桩损伤敏感量选取、基于动力特性的高桩码头基桩损伤识别方法、不完备模态测试信息的动力扩阶方法等研究。.本项目突破传统的反射波法检测高桩码头基桩缺陷，建立能够识别基桩隐蔽部位损伤的方法，为基桩检测提供一种新的思路与策略。.通过本项目的资助，发表SCI检索论文一篇，EI检索论文三篇；申请“一种基于结构动力响应的髙桩码头基桩的损伤诊断方法”发明专利一项；以第一作者出版“高桩码头基桩损伤识别方法及承载力检测技术研究”专著一部；该项目的主要研究成果纳入到“码头结构病害静动态无损诊断与性能提升技术”中，获得2017年度中国航海学会科技进步特等奖；申请获得“天科院高桩码头基桩动力无损检测系统V1.0”软件著作权一项；参加国际学术会议一次。