Nonlinear Characteristics of Damaged Reinforced Concrete Beam from Hilbert-Huang Transform
Publication: Journal of Structural Engineering
Volume 133, Issue 8
Abstract
This note studies the signatures of nonlinear characteristics in the vibration response of a reinforced concrete beam with cracks using Hilbert-Huang transform with reference to their possible use for detecting damage in reinforced concrete structures. The measured vibration signal from different cracked states of the beam are decomposed into intrinsic mode function (IMF) using empirical mode decomposition with the Hilbert-Huang spectrum computed for each of them. The time history of the instantaneous frequency of the beam, obtained from the IMF, is found correlating with the opening and closure of cracks. The effects of amplitude modulation and the Gibb’s phenomenon in the instantaneous frequency fluctuation have been separately quantified. The acceleration-frequency or the amplitude-frequency relationship in one cycle of vibration show distinctly the nonlinear vibration characteristics, and the damping ratio and instantaneous frequency change could be two good indicators of damage in the reinforced concrete beam under study.
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Acknowledgments
The work described in this note was supported by a grant from the Hong Kong Polytechnic University Research Funding Project No. G-YW98.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 133 • Issue 8 • August 2007
Pages: 1186 - 1191
Copyright
© 2007 ASCE.
History
Received: Sep 14, 2005
Accepted: Dec 27, 2006
Published online: Aug 1, 2007
Published in print: Aug 2007
Notes
Note. Associate Editor: Ahmet Emin Aktan
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