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dc.contributor.authorKariyawasam, Kasun D.
dc.contributor.authorMiddleton, Campbell R.
dc.contributor.authorMadabhushi, Gopal
dc.contributor.authorHaigh, Stuart K.
dc.contributor.authorTalbot, James P.
dc.date.accessioned2020-09-30T15:12:41Z
dc.date.available2020-09-30T15:12:41Z
dc.date.issued2020-07-18
dc.date.submitted2020-01-10
dc.identifier.issn2190-5452
dc.identifier.others13349-020-00420-5
dc.identifier.other420
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/310909
dc.descriptionFunder: Gates Cambridge Trust (GB)
dc.description.abstractAbstract: One of the most prevalent causes of bridge failure around the world is “scour”—the gradual erosion of soil around a bridge foundation due to fast-flowing water. A reliable technique for monitoring scour would help bridge engineers take timely countermeasures to safeguard against failure. Although vibration-based techniques for monitoring structural damage have had limited success, primarily due to insufficient sensitivity, these have tended to focus on the detection of local damage. High natural frequency sensitivity has recently been reported for scour damage. Previous experiments to investigate this have been limited as a result of the cost of full-scale testing and the fact that scaled-down soil-structure models tested outside a centrifuge do not adequately simulate full-scale behaviour. This paper describes the development of what is believed to be the first-ever centrifuge-testing programme to establish the sensitivity of bridge natural frequency to scour. A 1/60 scale model of a two-span integral bridge with 15 m spans was tested at varying levels of scour. For the fundamental mode of vibration, these tests found up to a 40% variation in natural frequency for 30% loss of embedment. Models of three other types of foundation, which represent a shallow pad foundation, a deep pile bent and a deep monopile, were also tested in the centrifuge at different scour levels. The shallow foundation model showed lower frequency sensitivity to scour than the deep foundation models. Another important finding is that the frequency sensitivity to “global scour” is slightly higher than the sensitivity to “local scour”, for all foundation types. The level of frequency sensitivity (3.1–44% per scour depth equivalent to 30% of embedment of scour) detected in this experiment demonstrates the potential for using natural frequency as an indicator of both local and global scour of bridges, particularly those with deep foundations.
dc.languageen
dc.publisherSpringer Berlin Heidelberg
dc.rightsAttribution 4.0 International (CC BY 4.0)en
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectOriginal Paper
dc.subjectVibration-based scour monitoring
dc.subjectBridge scour
dc.subjectNatural frequency
dc.subjectCentrifuge modelling
dc.subjectIntegral bridge
dc.titleAssessment of bridge natural frequency as an indicator of scour using centrifuge modelling
dc.typeArticle
dc.date.updated2020-09-30T15:12:41Z
prism.endingPage881
prism.issueIdentifier5
prism.publicationNameJournal of Civil Structural Health Monitoring
prism.startingPage861
prism.volume10
dc.identifier.doi10.17863/CAM.58001
dcterms.dateAccepted2020-07-01
rioxxterms.versionofrecord10.1007/s13349-020-00420-5
rioxxterms.versionVoR
rioxxterms.licenseref.urihttps://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidKariyawasam, Kasun D. [0000-0003-0441-9258]
dc.identifier.eissn2190-5479
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/N021614/1)
pubs.funder-project-idInnovate UK (920035)
pubs.funder-project-idBill and Melinda Gates Foundation (OPP1144)
datacite.issupplementedby.urlhttps://doi.org/10.17863/CAM.54904


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Attribution 4.0 International (CC BY 4.0)
Except where otherwise noted, this item's licence is described as Attribution 4.0 International (CC BY 4.0)