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Rapid post-earthquake damage assessment of ageing reinforced concrete bridge piers using time-frequency analysis

Rapid post-earthquake damage assessment of ageing reinforced concrete bridge piers using time-frequency analysis
Rapid post-earthquake damage assessment of ageing reinforced concrete bridge piers using time-frequency analysis
The role of signal-based nonlinear system identification methods for the rapid post-earthquake damage assessment of reinforced concrete (RC) bridge piers is explored. Experimental data from the shaking table tests of six RC columns with and without corrosion damage are used as benchmark data. The specimens are excited under three different ground motions with different time-series characteristics, structural detailing, and corrosion levels. The proposed system identification methods make use of accelerations alone (but not displacements as these are costly in-situ) to estimate the instantaneous frequency. The Wigner-Ville distribution and Hilbert transform are utilised due to their high resolution in both time and frequency domains.
A combination of modal filtering and thresholding, using instantaneous amplitudes, are employed to attenuate the unreliable spikes in the Hilbert transform’s instantaneous frequency estimates. Their performance is benchmarked against a moving linear regression and standard white-noise tests. The comparison of the experimental results and time-frequency analysis indicates that the Wigner-Ville distribution and the Hilbert transform can produce reliable rapid damage detection when the response amplitude is large. The Wigner-Ville distribution has better robustness and higher resolution. The robustness of the more computationally efficient Hilbert transform can be significantly improved by the introduction of modal filtering and thresholding.
RC bridge piers, Hilbert transform, Wigner-Ville distribution, Post-earthquake damage assessment, Nonlinear system identification
1573-2479
Ge, Xiao
3df78992-78e0-4c86-b10e-dcdaa53cacdb
Alexander, Nicholas
1427c28c-d5ed-4b3f-a40d-6a4c6be67c6b
Kashani, Mohammad
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Ge, Xiao
3df78992-78e0-4c86-b10e-dcdaa53cacdb
Alexander, Nicholas
1427c28c-d5ed-4b3f-a40d-6a4c6be67c6b
Kashani, Mohammad
d1074b3a-5853-4eb5-a4ef-7d741b1c025d

Ge, Xiao, Alexander, Nicholas and Kashani, Mohammad (2020) Rapid post-earthquake damage assessment of ageing reinforced concrete bridge piers using time-frequency analysis. Structure and Infrastructure Engineering. (doi:10.1080/15732479.2020.1801769).

Record type: Article

Abstract

The role of signal-based nonlinear system identification methods for the rapid post-earthquake damage assessment of reinforced concrete (RC) bridge piers is explored. Experimental data from the shaking table tests of six RC columns with and without corrosion damage are used as benchmark data. The specimens are excited under three different ground motions with different time-series characteristics, structural detailing, and corrosion levels. The proposed system identification methods make use of accelerations alone (but not displacements as these are costly in-situ) to estimate the instantaneous frequency. The Wigner-Ville distribution and Hilbert transform are utilised due to their high resolution in both time and frequency domains.
A combination of modal filtering and thresholding, using instantaneous amplitudes, are employed to attenuate the unreliable spikes in the Hilbert transform’s instantaneous frequency estimates. Their performance is benchmarked against a moving linear regression and standard white-noise tests. The comparison of the experimental results and time-frequency analysis indicates that the Wigner-Ville distribution and the Hilbert transform can produce reliable rapid damage detection when the response amplitude is large. The Wigner-Ville distribution has better robustness and higher resolution. The robustness of the more computationally efficient Hilbert transform can be significantly improved by the introduction of modal filtering and thresholding.

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Ge et al_AcceptedManuscript - Accepted Manuscript
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More information

Accepted/In Press date: 21 May 2020
e-pub ahead of print date: 13 August 2020
Keywords: RC bridge piers, Hilbert transform, Wigner-Ville distribution, Post-earthquake damage assessment, Nonlinear system identification

Identifiers

Local EPrints ID: 441194
URI: http://eprints.soton.ac.uk/id/eprint/441194
ISSN: 1573-2479
PURE UUID: bbd9876e-bf9c-48b6-8b40-e149dc6d131d
ORCID for Mohammad Kashani: ORCID iD orcid.org/0000-0003-0008-0007

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Date deposited: 04 Jun 2020 16:31
Last modified: 17 Mar 2024 05:36

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Contributors

Author: Xiao Ge
Author: Nicholas Alexander

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