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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 22 — Aug. 1, 2009
  • pp: 4483–4489

Seismic damage identification for steel structures using distributed fiber optics

Shuang Hou, C. S. Cai, and Jinping Ou  »View Author Affiliations


Applied Optics, Vol. 48, Issue 22, pp. 4483-4489 (2009)
http://dx.doi.org/10.1364/AO.48.004483


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Abstract

A distributed fiber optic monitoring methodology based on optic time domain reflectometry technology is developed for seismic damage identification of steel structures. Epoxy with a strength closely associated to a specified structure damage state is used for bonding zigzagged configured optic fibers on the surfaces of the structure. Sensing the local deformation of the structure, the epoxy modulates the signal change within the optic fiber in response to the damage state of the structure. A monotonic loading test is conducted on a steel specimen installed with the proposed sensing system using selected epoxy that will crack at the designated strain level, which indicates the damage of the steel structure. Then, using the selected epoxy, a varying degree of cyclic loading amplitudes, which is associated with different damage states, is applied on a second specimen. The test results show that the specimen’s damage can be identified by the optic sensors, and its maximum local deformation can be recorded by the sensing system; moreover, the damage evolution can also be identified.

© 2009 Optical Society of America

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: February 13, 2009
Revised Manuscript: July 8, 2009
Manuscript Accepted: July 10, 2009
Published: July 28, 2009

Citation
Shuang Hou, C. S. Cai, and Jinping Ou, "Seismic damage identification for steel structures using distributed fiber optics," Appl. Opt. 48, 4483-4489 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-22-4483


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References

  1. J. P. Lynch, Y. Wang, K. C. Lu, T. C. Hou, and C. H. Loh, “Post-seismic damage assessment of steel structures instrumented with self-interrogating wireless sensors,” in Proceedings of the 8th National Conference on Earthquake Engineering (8NCEE) (Earthquake Engineering Research Institute, 2006).
  2. W. L. Schulz, J. P. Conte, and E. Udd, “Long gauge fiber optic Bragg grating strain sensors to monitor civil structures,” Proc. SPIE 4330, 56-65 (2001). [CrossRef]
  3. J. P. Ou and S. Hou, “Seismic damage identification using multi-line distributed fiber optic sensor system,” Proc. SPIE 5856, 1003-1008 (2005). [CrossRef]
  4. K. T. Wang and C. K. Y. Leung, “Applications of a distributed fiber optic crack sensor for concrete structures,” Sens. Actuators A, Phys. 135, 458-464 (2007). [CrossRef]
  5. C. K. Y. Leung, N. Elvin, N. Olson, T. F. Morse, and Y. F. He, “A novel distributed optical crack sensor for concrete structures,” Eng. Fract. Mech. 65(2-3), 133-148 (2005). [CrossRef]
  6. Y. B. Liao, Fiber Optics (Tsinghua University Press, 2000).
  7. J. P. Ou, S. Hou, Z. Zhou, and A. V. Dyshlyuk, “The multi-line distributed fiber optic crack detection system and its application,” Piezoelectrics Acoustooptics 29(2), 144-147 (2007).
  8. M. Mihalikova and J. Janek, “Influence of the loading and strain rates on the strength properties and formability of higher-strength sheet,” Metalurgija 46(2), 107-110 (2007).

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