30 March 2009 Damage detection using frequency response functions under ground excitation
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This paper deals with the problem of damage localization and quantification using the Frequency Response Function (FRF) subjected to earthquake ground excitation. The damage identification equation is derived from the motion equation of the system before and after damage. The FRFs of the intact and damaged system as well as the system matrices of the intact system are required to solve the damage identification equation. The system matrices can be obtained from the state matrices identified by subspace identification technique. According to the numerical study of a frame structure, only a few discrete frequencies from the FRFs which are close to the system natural frequencies are sufficient to achieve a satisfactory precision of damage extent. The proposed technique was applied to an experimental data of a 6-story steel frame structure and its efficiency was confirmed.
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Ting-Yu Hsu, Ting-Yu Hsu, Chin-Hsiung Loh, Chin-Hsiung Loh, "Damage detection using frequency response functions under ground excitation", Proc. SPIE 7292, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009, 72923P (30 March 2009); doi: 10.1117/12.815441; https://doi.org/10.1117/12.815441

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