Experimental Demonstration of a Mode Shape-Based Scour-Monitoring Method for Multispan Bridges with Shallow Foundations
Publication: Journal of Bridge Engineering
Volume 25, Issue 8
Abstract
This paper experimentally investigates a vibration-based scour monitoring approach applicable to bridges with multiple simply supported spans on shallow foundations. A monitoring strategy based on the relative changes in pier-mode shape amplitudes due to scour is postulated. The first global mode shape of a bridge structure with multiple spans is extracted from acceleration measurements using an output-only approach, frequency domain decomposition (FDD). The relative changes of the pier-mode shape amplitudes under scour are then tracked. Here, each pier-mode shape value is compared with the mean values of the remaining piers in a process that creates a mean-normalized mode shape (MNMS). The approach is demonstrated on a scaled model of a bridge with four spans, supported on sprung foundations, where scour is simulated by the replacement of springs, with springs of lower stiffness corresponding to a reduction in foundation stiffness. It is shown that at a given “scoured” pier, significant increases in the MNMS value occur, suggesting that the location of the scour can be identified. The magnitude of the MNMS at a given pier also increases with an increase in stiffness loss due to scour. In practice, the approach would work best by carrying out a visual inspection of the bridge to establish the initial health condition at the time of sensor installation. After this initial process, the bridge can be monitored remotely for scour on an ongoing basis.
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Acknowledgments
The authors wish to acknowledge the financial support received from Science Foundation Ireland under the US-Ireland Research Partnership Scheme, Grant No. 14/US/I3033.
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Published In
Journal of Bridge Engineering
Volume 25 • Issue 8 • August 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Mar 14, 2019
Accepted: Mar 13, 2020
Published online: May 29, 2020
Published in print: Aug 1, 2020
Discussion open until: Oct 29, 2020
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