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Shock and Vibration
Volume 2015, Article ID 354564, 6 pages
Research Article

Damage Detection Technique for Cold-Formed Steel Beam Structure Based on NSGA-II

1Department of Architectural Engineering, Yonsei University, Seoul 120-749, Republic of Korea
2Center for Structural Health Care Technology in Building, Yonsei University, Seoul 120-749, Republic of Korea
3Department of Architecture, Catholic University of Daegu, Gyeongsan-si 712-702, Republic of Korea

Received 2 June 2015; Accepted 16 July 2015

Academic Editor: Yeesock Kim

Copyright © 2015 Byung Kwan Oh et al. 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.


Cold-formed steel is uniform in quality, suitable for mass production, and light in weight. It is widely used for both structural and nonstructural members in buildings. When it is used in a bending structural member, damage such as local buckling is considered to be more important than general steel members in terms of failure mode. However, preceding studies on damage detection did not consider the failure characteristics of cold-formed beam members. Hence, this paper proposes a damage detection technique that considers the failure mode of local buckling for a cold-formed beam member. The differences between the dynamic characteristics from vibration-based measurements and those from finite element model are set to error functions. The error functions are minimized by the optimization technique NSGA-II. In the damage detection, the location of local damage and the severity of damage are considered variables. The proposed technique was validated through a simulation of damage detection for a cold-formed steel beam structure example.