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A comparison of modal flexibility method and modal curvature method in structural damage detection

机译：模态柔度法与模态曲率法在结构损伤检测中的比较

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摘要

Vibration based damage detection techniques examines the changes in dynamic properties of a structure such as frequency, mode shape and damping to indicate the presence of damage. This method is preferred for its ease of implementation, non-destructive nature and its ability to identify damage that is invisible to the surface. Two vibration based damage detection methods are used in this study, namely Modal Flexibility Method and Modal Curvature Method. Although there have been numerous publications on these two methods, there is lack of study on the direct comparison of the methods. Finite element modal analysis of a reinforced concrete slab and steel frame was carried out to obtain the dynamic responses that were used to calculate the Modal Flexibility and Modal Curvature. The structural models were simulated using four damage cases: damage at single location, damage at multiple locations, damage at support location and damage at different damage severities. The comparison of the sensitivity and reliability of Modal Flexibility and Modal Curvature were evaluated using the results of these four damage cases. The results show that the sensitivity and reliability of both methods are affected by the size of the damaged area, its location relative to the support location and the number of damaged segments.
机译：基于振动的损坏检测技术检查结构的动态特性（例如频率，振型和阻尼）的变化，以指示是否存在损坏。优选该方法，因为其易于实施，无损性质并且能够识别表面不可见的损坏。本研究使用两种基于振动的损伤检测方法，即模态柔度法和模态曲率法。尽管有很多关于这两种方法的出版物，但是缺乏对这些方法的直接比较的研究。对钢筋混凝土楼板和钢框架进行了有限元模态分析，获得了用于计算模态柔韧性和模态曲率的动力响应。使用四种损坏情况对结构模型进行了模拟：单个位置的损坏，多个位置的损坏，支撑位置的损坏以及不同严重程度的损坏。使用这四个损伤案例的结果，评估了模态柔韧性和模态曲率敏感性和可靠性的比较。结果表明，两种方法的灵敏度和可靠性均受损坏区域的大小，相对于支撑位置的位置以及损坏段数的影响。

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    Zaharudin Noor Sabrina;

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  • 年度 2010
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  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
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