Smart Structures and Systems

  • 제4권5호
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  • Pages.605-628
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  • 2008
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Damage detection in beam-like structures using deflections obtained by modal flexibility matrices

  • Koo, Ki-Young (Department of Civil & Environmental Engineering, KAIST) ;
  • Lee, Jong-Jae (Civil & Environmental Engineering, Sejong University) ;
  • Yun, Chung-Bang (Department of Civil & Environmental Engineering, KAIST) ;
  • Kim, Jeong-Tae (Department of Ocean Engineering, Pukyong National University)
  • 투고 : 2007.10.20
  • 심사 : 2008.01.15
  • 발행 : 2008.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

In bridge structures, damage may induce an additional deflection which may naturally contain essential information about the damage. However, inverse mapping from the damage-induced deflection to the actual damage location and severity is generally complex, particularly for statically indeterminate systems. In this paper, a new load concept, called the positive-bending-inspection-load (PBIL) is proposed to construct a simple inverse mapping from the damage-induced deflection to the actual damage location. A PBIL for an inspection region is defined as a load or a system of loads which guarantees the bending moment to be positive in the inspection region. From the theoretical investigations, it was proven that the damage-induced chord-wise deflection (DI-CD) has the maximum value with the abrupt change in its slope at the damage location under a PBIL. Hence, a novel damage localization method is proposed based on the DI-CD under a PBIL. The procedure may be summarized as: (1) identification of the modal flexibility matrices from acceleration measurements, (2) design for a PBIL for an inspection region of interest in a structure, (3) calculation of the chord-wise deflections for the PBIL using the modal flexibility matrices, and (4) damage localization by finding the location with the maximum DI-CD with the abrupt change in its slope within the inspection region. Procedures from (2)-(4) can be repeated for several inspection regions to cover the whole structure complementarily. Numerical verification studies were carried out on a simply supported beam and a three-span continuous beam model. Experimental verification study was also carried out on a two-span continuous beam structure with a steel box-girder. It was found that the proposed method can identify the damage existence and damage location for small damage cases with narrow cuts at the bottom flange.

키워드

참고문헌

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피인용 문헌

  1. Structural model updating of steel box girder bridge using modal flexibility based deflections vol.7, pp.4, 2012, https://doi.org/10.3846/bjrbe.2012.34
  2. Noncontact laser ultrasonic crack detection for plates with additional structural complexities vol.12, pp.5-6, 2013, https://doi.org/10.1177/1475921713500515
  3. A multi-scale sensing and diagnosis system combining accelerometers and gyroscopes for bridge health monitoring vol.23, pp.1, 2014, https://doi.org/10.1088/0964-1726/23/1/015005
  4. Overall damage identification of flag-shaped hysteresis systems under seismic excitation vol.16, pp.1, 2015, https://doi.org/10.12989/sss.2015.16.1.163
  5. A new method to detect cracks in plate-like structures with though-thickness cracks vol.14, pp.3, 2014, https://doi.org/10.12989/sss.2014.14.3.397
  6. Damage detection of shear buildings using deflections obtained by modal flexibility vol.19, pp.11, 2010, https://doi.org/10.1088/0964-1726/19/11/115026
  7. Model-based identification of damage from sparse sensor measurements using Neumann series expansion vol.25, pp.2, 2017, https://doi.org/10.1080/17415977.2016.1160393
  8. Structural Damage Localization by the Principal Eigenvector of Modal Flexibility Change vol.9, pp.4, 2016, https://doi.org/10.3390/a9020024
  9. Feasibility study on an angular velocity-based damage detection method using gyroscopes vol.25, pp.7, 2014, https://doi.org/10.1088/0957-0233/25/7/075009
  10. Truncation error analysis on modal flexibility-based deflections: application to mass regular and irregular structures vol.142, 2017, https://doi.org/10.1016/j.engstruct.2017.03.057
  11. Smart sensing, monitoring, and damage detection for civil infrastructures vol.15, pp.1, 2011, https://doi.org/10.1007/s12205-011-0001-y
  12. Modal flexibility-based damage detection of cantilever beam-type structures using baseline modification vol.333, pp.18, 2014, https://doi.org/10.1016/j.jsv.2014.04.056
  13. The application of modal filters for damage detection vol.6, pp.2, 2008, https://doi.org/10.12989/sss.2010.6.2.115
  14. Structural health monitoring of a cable-stayed bridge using wireless smart sensor technology: data analyses vol.6, pp.5, 2008, https://doi.org/10.12989/sss.2010.6.5_6.461
  15. A simple method to detect cracks in beam-like structures vol.9, pp.4, 2008, https://doi.org/10.12989/sss.2012.9.4.335
  16. Output-only damage detection in buildings using proportional modal flexibility-based deflections in unknown mass scenarios vol.167, pp.None, 2008, https://doi.org/10.1016/j.engstruct.2018.04.036
  17. FEM Free Damage Detection of Beam Structures Using the Deflections Estimated by Modal Flexibility Matrix vol.21, pp.9, 2021, https://doi.org/10.1142/s0219455421501285