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The Scientific World Journal
Volume 2014, Article ID 410539, 11 pages
http://dx.doi.org/10.1155/2014/410539
Research Article

Detection of Earthquake-Induced Damage in a Framed Structure Using a Finite Element Model Updating Procedure

1Department of Architectural Engineering, Hanyang University 222, Wangsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea
2Department of Architectural Engineering, Dankook University, Jukjeon-dong, Yongin-si 448-701, Republic of Korea

Received 31 October 2013; Accepted 17 December 2013; Published 16 January 2014

Academic Editors: A. K. Gupta, R. Su, and Q. W. Yang

Copyright © 2014 Eunjong Yu 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.

Abstract

Damage of a 5-story framed structure was identified from two types of measured data, which are frequency response functions (FRF) and natural frequencies, using a finite element (FE) model updating procedure. In this study, a procedure to determine the appropriate weightings for different groups of observations was proposed. In addition, a modified frame element which included rotational springs was used to construct the FE model for updating to represent concentrated damage at the member ends (a formulation for plastic hinges in framed structures subjected to strong earthquakes). The results of the model updating and subsequent damage detection when the rotational springs (RS model) were used were compared with those obtained using the conventional frame elements (FS model). Comparisons indicated that the RS model gave more accurate results than the FS model. That is, the errors in the natural frequencies of the updated models were smaller, and the identified damage showed clearer distinctions between damaged and undamaged members and was more consistent with observed damage.