Modelling the degradation of vibration characteristics of reinforced concrete beams due to flexural damage

Hamad, W.I. and Owen, J.S. and Hussein, M.F.M. (2015) Modelling the degradation of vibration characteristics of reinforced concrete beams due to flexural damage. Structural Control and Health Monitoring, 22 (6). pp. 939-967. ISSN 1545-2255

[img]
Preview
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Available under Licence Creative Commons Attribution Non-commercial.
Download (1MB) | Preview

Abstract

This paper presents an improved crack model incorporating non-linearity of flexural damage in concrete to reproduce changes in vibration properties of cracked reinforced concrete beams. A reinforced concrete beam model with multiple-distributed flexural cracks is developed, in which the cracked regions are modelled using the fictitious crack approach and the undamaged parts are treated in a linear-elastic manner. The model is subject to incremental static four-point bending, and its dynamic behaviour is examined using different sinusoidal excitations including swept sine and harmonic signals. From the swept sine excitations, the model simulates changes in resonant frequency with increasing damage. The harmonic excitations are utilised to investigate changes in modal stiffness extracted from the restoring force surfaces, and changes in the level of non-linearity are deduced from the appearance of super-harmonics in the frequency domain. The simulation results are compared with experimental data of reinforced concrete beams subject to incremental static four-point bending. The comparisons revealed that the proposed crack model is able to quantitatively predict changes in vibration characteristics of cracked reinforced concrete beams. Changes are sensitive to support stiffness, where the sensitivity increases with stiffer support conditions. Changes in the level of non-linearity with damage are not suitable for damage detection in reinforced concrete structures because they do not follow a monotonic trend.

Item Type: Article
Additional Information: This is the peer reviewed version of the following article: Hamad, W. I., Owen, J. S., and Hussein, M. F. M. (2015), Modelling the degradation of vibration characteristics of reinforced concrete beams due to flexural damage. Struct. Control Health Monit., 22, 939–967. doi: 10.1002/stc.1726, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/stc.1726/abstract. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Keywords: Reinforced concrete beams; vibration-based damage detection; non-linear vibration; flexural crack modelling; vibration measurements
Schools/Departments: University of Nottingham UK Campus > Faculty of Engineering
Identification Number: https://doi.org/10.1002/stc.1726
Depositing User: Eprints, Support
Date Deposited: 29 Jul 2016 12:37
Last Modified: 14 Sep 2016 11:26
URI: http://eprints.nottingham.ac.uk/id/eprint/35566

Actions (Archive Staff Only)

Edit View Edit View