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An improved method to detect damage using modal strain energy based damage index

Wahalthantri, B.L., Thambiratnam, D.P., Chan, T.H.T., & Fawzia, S. (2012) An improved method to detect damage using modal strain energy based damage index. Advances in Structural Engineering, 15(5), pp. 727-742.

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Abstract

This paper presents two novel concepts to enhance the accuracy of damage detection using the Modal Strain Energy based Damage Index (MSEDI) with the presence of noise in the mode shape data. Firstly, the paper presents a sequential curve fitting technique that reduces the effect of noise on the calculation process of the MSEDI, more effectively than the two commonly used curve fitting techniques; namely, polynomial and Fourier’s series. Secondly, a probability based Generalized Damage Localization Index (GDLI) is proposed as a viable improvement to the damage detection process. The study uses a validated ABAQUS finite-element model of a reinforced concrete beam to obtain mode shape data in the undamaged and damaged states. Noise is simulated by adding three levels of random noise (1%, 3%, and 5%) to the mode shape data. Results show that damage detection is enhanced with increased number of modes and samples used with the GDLI.

Impact and interest:

2 citations in Scopus
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1 citations in Web of Science®

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230 since deposited on 07 Aug 2012
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ID Code: 52921
Item Type: Journal Article
Keywords: Modal strain energy based damage index, Noise, Sequential curve fitting technique, False alarms, Probability, Generalized damage localization index
DOI: 10.1260/1369-4332.15.5.727
ISSN: 1369-4332
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 Please consult the authors.
Deposited On: 07 Aug 2012 11:06
Last Modified: 14 Aug 2012 23:00

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