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Improvements in the accuracy of system identification and nondestructive damage evaluation in civil engineering structures.

机译:改善土木工程系统中系统识别和无损破坏评估的准确性。

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摘要

Many system identification (SID) techniques for estimating structural parameters and nondestructive damage evaluation (NDE) algorithms for assessing the structural integrity of civil engineering structures have been proposed and developed on various theoretical and experimental grounds. The identified structural parameters of the structures obtained using SID techniques can then be applied to the problems of NDE. Inaccurate results from a SID technique may yield incorrect locations and severity estimation of damage obtained from an NDE algorithm in civil engineering structures such as offshore structures and bridges. Therefore, more accurate SID and NDE methods for structural systems are paramount and one of the more pressing problems in the civil engineering field. In order to improve the accuracy of a SID technique and an NDE algorithm in civil engineering structures, the use of additional spectral information and an improved damage index are explored in this study. First, a baseline SID technique and NDE algorithm are selected. Second, an extended SID technique including additional spectral information and retaining the basic structure of the baseline SID is derived. Third, an extended NDE algorithm is developed to overcome some limitations of the baseline NDE algorithm. To demonstrate the improvements of the accuracy in SID and NDE using the extended methods, numerical and experimental studies are performed.
机译:已经在各种理论和实验基础上提出并开发了许多用于估计结构参数的系统识别(SID)技术和用于评估土木工程结构的结构完整性的无损破坏评估(NDE)算法。然后,可以将使用SID技术获得的结构的已识别结构参数应用于NDE问题。 SID技术的不正确结果可能会产生错误的位置,并且会严重破坏估计,这些结果是从NDE算法获得的土木工程结构(如海上结构和桥梁)中的破坏得出的。因此,更精确的结构系统SID和NDE方法是最重要的,并且是土木工程领域中更为紧迫的问题之一。为了提高SID技术和NDE算法在土木工程结构中的准确性,本研究探索了附加频谱信息的使用和改进的损伤指数。首先,选择基线SID技术和NDE算法。其次,推导了包括附加频谱信息并保留基线SID的基本结构的扩展SID技术。第三,开发了扩展的NDE算法以克服基线NDE算法的某些限制。为了证明使用扩展方法提高了SID和NDE的准确性,进行了数值和实验研究。

著录项

  • 作者

    Nam, Dong-Ho.;

  • 作者单位

    Texas A&M University.;

  • 授予单位 Texas A&M University.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 268 p.
  • 总页数 268
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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