Laboratory investigation of a bridge scour monitoring method using decentralized modal analysis

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Title: Laboratory investigation of a bridge scour monitoring method using decentralized modal analysis
Authors: Khan, Muhammad ArslanMcCrum, DanielPrendergast, Luke J.O'Brien, Eugene J.Kim, Chul-Woo
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Date: 1-Nov-2021
Online since: 2022-06-03T12:14:40Z
Abstract: 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.
Funding Details: Science Foundation Ireland
Funding Details: National Science Foundation (NSF)
Invest Northern Ireland
US-Ireland R&D
Type of material: Journal Article
Publisher: SAGE
Journal: Structural Health Monitoring
Volume: 20
Issue: 6
Start page: 3327
End page: 3341
Copyright (published version): 2021 The Authors
Keywords: Bridge health monitoringStructural dynamicsBridge scour damageDecentralized modal analysisRe-deployable sensorsLaboratory-scaled bridge modelVehicle-bridge interaction
DOI: 10.1177/1475921720985122
Language: en
Status of Item: Peer reviewed
ISSN: 1475-9217
This item is made available under a Creative Commons License:
Appears in Collections:Civil Engineering Research Collection

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