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Advances in Materials Science and Engineering
Volume 2013, Article ID 405143, 7 pages
Research Article

Estimation of Curvature Changes for Steel-Concrete Composite Bridge Using Fiber Bragg Grating Sensors

1Advanced Infrastructure Research Team, Korea Railroad Research Institute, 360-1 Woram-dong, Gyeonggi-do, Uiwang-si 437-757, Republic of Korea
2Department of Civil Engineering, Kyung Hee University, Gyeonggi-do, Yongin-si 446-701, Republic of Korea

Received 5 September 2013; Revised 1 November 2013; Accepted 1 November 2013

Academic Editor: Noriah Bidin

Copyright © 2013 Donghoon Kang and Wonseok Chung. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This study is focused on the verification of the key idea of a newly developed steel-concrete composite bridge. The key idea of the proposed bridge is to reduce the design moment by applying vertical prestressing force to steel girders, so that a moment distribution of a continuous span bridge is formed in a simple span bridge. For the verification of the key technology, curvature changes of the bridge should be monitored sequentially at every construction stage. A pair of multiplexed FBG sensor arrays is proposed in order to measure curvature changes in this study. They are embedded in a full-scale test bridge and measured local strains, which are finally converted to curvatures. From the result of curvature changes, it is successfully ensured that the key idea of the proposed bridge, expected theoretically, is viable.