Lessons learned from applications of vibration-based damage identification methods to a large bridge structure

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Over the past 30 years detecting damage in a structure from changes in dynamic parameters has received considerable attention from the aerospace, civil, and mechanical engineering communities. The general idea is that changes in the structure`s physical properties (i.e., stiffness, mass, and/or damping) will, in turn, alter the dynamic characteristics (i.e., resonant frequencies, modal damping, and mode shapes) of the structure. Properties such as the flexibility matrix, stiffness matrix, and mode shape curvature, which are obtained from modal parameters, have shown promise for locating structural damage. However, the application of these techniques to large civil engineering structures is limited because ... continued below

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23 p.

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Farrar, C.R. & Doebling, S.W. October 1, 1997.

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Description

Over the past 30 years detecting damage in a structure from changes in dynamic parameters has received considerable attention from the aerospace, civil, and mechanical engineering communities. The general idea is that changes in the structure`s physical properties (i.e., stiffness, mass, and/or damping) will, in turn, alter the dynamic characteristics (i.e., resonant frequencies, modal damping, and mode shapes) of the structure. Properties such as the flexibility matrix, stiffness matrix, and mode shape curvature, which are obtained from modal parameters, have shown promise for locating structural damage. However, the application of these techniques to large civil engineering structures is limited because of the inability to find structures that the owners will allow to be damaged. Also, the cost associated with testing these structures can be prohibitive. In this paper, the authors` experiences with performing modal tests on a large highway bridge, in its undamaged and damaged state, for the purpose of damage identification will be summarized. Particular emphasis will be made on the lessons learned from this experience and the lessons learned from recent tests on another bridge structure.

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23 p.

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OSTI as DE98000282

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  • International workshop on structural health monitoring, Stanford, CA (United States), 18-20 Sep 1997

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  • Other: DE98000282
  • Report No.: LA-UR--97-2469
  • Report No.: CONF-970993--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 539838
  • Archival Resource Key: ark:/67531/metadc690797

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  • October 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • May 20, 2016, 1:27 p.m.

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Farrar, C.R. & Doebling, S.W. Lessons learned from applications of vibration-based damage identification methods to a large bridge structure, article, October 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc690797/: accessed August 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.