Damage identification in a concrete beam using curvature difference ratio

Al-Ghalib, A., Mohammad, F.A. ORCID: 0000-0001-6955-4261, Rahman, M. and Chilton, J.C., 2011. Damage identification in a concrete beam using curvature difference ratio. Journal of Physics - Conference Series, 305 (1), pp. 143-154. ISSN 1742-6588

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Previous studies utilising changes in mode shape or curvature to locate damage rely on the fact that the greatest change occurs around the defect. However, in concrete beams this fact is undermined due to the nature of the defect as distributed multi-site cracks. In addition, differences in mode shape and curvature as ways to locate the damage is unstable because of occurrence of modal nodes and inflection points. In this paper, one interesting solution to this problem is being tested by establishing a new non-dimensional expression designated the 'Curvature Difference Ratio (CDR)'. This parameter exploits the ratio of differences in curvature of a specific mode shape for a damaged stage and another reference stage. The expression CDR is reasonably used to locate the damage and estimate the dynamic bending stiffness in a successively loaded 6m concrete beam. Results obtained by the proposed technique are tested and validated with a case study results done by Ren and De Roeck [1] also by Maeck and De Roeck [2]. Another contribution of this work is that relating changes in vibration properties to the design bending moment at beam sections as defined in Eurocode 2 specifications [3]. Linking between a beam section condition and the change in vibration data will help to give a better comprehension on the beam condition than the applied load.

Item Type: Journal article
Description: Presented at 9th International Conference on Damage Assessment of Structures.
Publication Title: Journal of Physics - Conference Series
Creators: Al-Ghalib, A., Mohammad, F.A., Rahman, M. and Chilton, J.C.
Publisher: Institute of Physics
Date: 2011
Volume: 305
Number: 1
ISSN: 1742-6588
Rights: © 2011 IOP Publishing
Divisions: Schools > School of Architecture, Design and the Built Environment
Record created by: EPrints Services
Date Added: 09 Oct 2015 09:51
Last Modified: 09 Jun 2017 13:12
URI: https://irep.ntu.ac.uk/id/eprint/3783

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