Journal
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
Volume 20, Issue 6, Pages 3327-3341Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/1475921720985122
Keywords
Bridge health monitoring; structural dynamics; bridge scour damage; decentralized modal analysis; re-deployable sensors; vehicle-bridge interaction; laboratory-scaled bridge model
Funding
- Science Foundation Ireland (SFI) under the US/Ireland RD Partnership
- National Science Foundation (NSF)
- Invest Northern Ireland [16/US/13277]
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This article presents a new approach using modal analysis to detect bridge scour at shallow pad foundations and extract modal information. Testing on a numerical model showed that using modal analysis can help locate scour damage on bridges.
Scour is a significant issue for bridges worldwide that influences the global stiffness of bridge structures and hence alters the dynamic behaviour of these systems. For the first time, this article presents a new approach to detect bridge scour at shallow pad foundations, using a decentralized modal analysis approach through re-deployable accelerometers to extract modal information. A numerical model of a bridge with four simply supported spans on piers is created to test the approach. Scour is modelled as a reduction in foundation stiffness under a given pier. A passing half-car vehicle model is simulated to excite the bridge in phases of measurement to obtain segments of the mode shape using output-only modal analysis. Two points of the bridge are used to obtain modal amplitudes in each phase, which are combined to estimate the global mode shape. A damage indicator is postulated based on fitting curves to the mode shapes, using maximum likelihood, which can locate scour damage. The root mean square difference between the healthy and scoured mode shape curves exhibits an almost linear increase with increasing foundation stiffness loss under scour. Experimental tests have been carried out on a scaled model bridge to validate the approach presented in this article.
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