基于柔度矩阵差比值法的梁式结构损伤识别的研究
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摘要
在工程结构投入使用后,由于受到火灾、地震、飓风等自然灾害的侵蚀,再加上长期的疲劳荷载,结构本身容易产生不同程度的损伤。随着这些损伤的不断积累,结构会出现巨大的安全隐患,严重影响人民群众的人身安全,造成国民经济的直接重大损失。所以对工程结构开展损伤识别研究,帮助人们对结构进行实时监测、修复或改变结构的操作使用方法,有着重要的理论意义和实用价值。
目前,结构损伤识别是土建领域中一个新兴的研究方向,尚未形成统一的理论与方法,仍处于起步阶段.本文针对工程结构的损伤提出识别参数ζ法,并对该方法进行了研究分析,具体如下：
(1)查阅国内外相关研究文献,介绍了结构健康监测和结构损伤识别的意义,以及结构检测技术的应用前景；详细阐述了现阶段国内外在损伤识别领域的研究现状和研究成果,提出了本文的主要研究内容；
(2)详细描述了结构动力检测方法、结构动力检测的理论基础以及检测过程；
(3)详细论述柔度矩阵、柔度矩阵差比值、损伤识别参数的理论基础,分析了结构各阶频率以及相应的模态振型向量与损伤识别之间的关系。将模拟分析分为十个工况,对每一种损伤情况应用损伤识别参数法进行模拟识别,验证该方法的准确性、有效性、可行性；
(4)通过对一悬臂梁损伤前后的动力测试试验,在已知损伤的情况下利用ζ参数进行损伤识别,从而验证了损伤识别参数法的有效性、准确性、可行性；
(5)总结本文的研究内容及结论,得到一种切实可行的损伤识别的方法,并指出损伤识别参数法在实际应用中存在的一些问题。
After the application of engineering structure, due to fires, earthquakes, hurricanes and other natural disasters influence, plus long fatigue load, the structure itself is easy to produce different degree of damage. As accumulation of these damages, structure will appear huge security risk which will affect life and property safety, caused the direct losses of national economy. Therefore conducting a damage identification research into engineering structure helps people to promptly and accurately identify the damage of structure, repair or change the structure of the operating methods, and further propose the effective and practical solutions, and has important theoretical significance and practical value.
Structural damage identification is an emerging in civil engineering research field, which has not formed a unified theory and method, and is still in the initial stage of engineering structures. This article proposes parameter identification law based on engineering structures damage and analyzes this question as follows:
(1) After reviewing related literatures both in China and abroad, the significance of structural health monitoring and structure damage identification and application prospect of detecting technology is introduced in the paper. It elaborates the present research field in damage identification and research, and puts forward the main research contents.
(2) Gave a detailed description of structural dynamic detection methods, structure dynamic detection theoretical base and detection process.
(3) After described flexibility matrix, flexibility matrix difference ratio, parameters theoretical basis in detail, analyzed the relationship among various order frequency, corresponded modal shape vector and damage identification. Simulation analysis is divided into ten conditions and is used to verify the feasibility and validity, accuracy of this method by simulating identification of each injury application through parametric method.
(4) Through testing the dynamic power of a cantilever beam before and after injury, this paper identifies the damage of parameters on the basis of the known injury to verify the validity and accuracy of the parameter method.
(5) Summarized research contents and conclusions, got a feasible damage identification method and points out some problems existing in practical applications in this article.
目前,结构损伤识别是土建领域中一个新兴的研究方向,尚未形成统一的理论与方法,仍处于起步阶段.本文针对工程结构的损伤提出识别参数ζ法,并对该方法进行了研究分析,具体如下：
(1)查阅国内外相关研究文献,介绍了结构健康监测和结构损伤识别的意义,以及结构检测技术的应用前景；详细阐述了现阶段国内外在损伤识别领域的研究现状和研究成果,提出了本文的主要研究内容；
(2)详细描述了结构动力检测方法、结构动力检测的理论基础以及检测过程；
(3)详细论述柔度矩阵、柔度矩阵差比值、损伤识别参数的理论基础,分析了结构各阶频率以及相应的模态振型向量与损伤识别之间的关系。将模拟分析分为十个工况,对每一种损伤情况应用损伤识别参数法进行模拟识别,验证该方法的准确性、有效性、可行性；
(4)通过对一悬臂梁损伤前后的动力测试试验,在已知损伤的情况下利用ζ参数进行损伤识别,从而验证了损伤识别参数法的有效性、准确性、可行性；
(5)总结本文的研究内容及结论,得到一种切实可行的损伤识别的方法,并指出损伤识别参数法在实际应用中存在的一些问题。
After the application of engineering structure, due to fires, earthquakes, hurricanes and other natural disasters influence, plus long fatigue load, the structure itself is easy to produce different degree of damage. As accumulation of these damages, structure will appear huge security risk which will affect life and property safety, caused the direct losses of national economy. Therefore conducting a damage identification research into engineering structure helps people to promptly and accurately identify the damage of structure, repair or change the structure of the operating methods, and further propose the effective and practical solutions, and has important theoretical significance and practical value.
Structural damage identification is an emerging in civil engineering research field, which has not formed a unified theory and method, and is still in the initial stage of engineering structures. This article proposes parameter identification law based on engineering structures damage and analyzes this question as follows:
(1) After reviewing related literatures both in China and abroad, the significance of structural health monitoring and structure damage identification and application prospect of detecting technology is introduced in the paper. It elaborates the present research field in damage identification and research, and puts forward the main research contents.
(2) Gave a detailed description of structural dynamic detection methods, structure dynamic detection theoretical base and detection process.
(3) After described flexibility matrix, flexibility matrix difference ratio, parameters theoretical basis in detail, analyzed the relationship among various order frequency, corresponded modal shape vector and damage identification. Simulation analysis is divided into ten conditions and is used to verify the feasibility and validity, accuracy of this method by simulating identification of each injury application through parametric method.
(4) Through testing the dynamic power of a cantilever beam before and after injury, this paper identifies the damage of parameters on the basis of the known injury to verify the validity and accuracy of the parameter method.
(5) Summarized research contents and conclusions, got a feasible damage identification method and points out some problems existing in practical applications in this article.
引文
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