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Proceedings Paper

Seismic damage monitoirng for steel structure using smart distributed fiber optics
Author(s): Shuang Hou; C. S. Steve Cai; Jian He; Guoping Zhang; Jinping Ou
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Paper Abstract

Determination of structural seismic damage mechanisms and post-seismic damage assessment remains a major challenge for civil engineers. One of the main reasons is that traditional sensors cannot serve for such a long term to capture a destructive earthquake and the seismic damage cannot definitely be predicted in advance. In this paper, a smart distributed fiber optic monitoring method based on OTDR technology is developed for steel structure seismic damage identification. Geopolymer is used as a "smart material" to couple the sensing optic fiber with the structure of interest. It not only functions as the adhesive for bonding the optic fiber to the structure and protecting it, but also works as the sensing material by forming cracks when the pre-defined damage state occurs, which introduce optic power loss into the optic fiber. The power loss is able to be monitored through optic time domain reflectrometry (OTDR). Tentative tests are conducted to decide the composition of geopolymer. It is found that the Si/Al ratio of 3.8 provided cracking strains of about 1300 micro strain, which is desirable for monitoring the yielding of steel. Monotonic, cyclic and buckling loading tests on steel specimen were conducted to verify the efficiency of the proposed system in monitoring seismic damage mechanism.

Paper Details

Date Published: 30 March 2009
PDF: 9 pages
Proc. SPIE 7292, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009, 72923U (30 March 2009); doi: 10.1117/12.815616
Show Author Affiliations
Shuang Hou, Dalian Univ. of Technology (China)
Louisiana State Univ. (United States)
C. S. Steve Cai, Louisiana State Univ. (United States)
Jian He, Louisiana State Univ. (United States)
Guoping Zhang, Louisiana State Univ. (United States)
Jinping Ou, Dalian Univ. of Technology (China)

Published in SPIE Proceedings Vol. 7292:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009
Masayoshi Tomizuka, Editor(s)

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