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An investigation of the changes in the natural frequency of a pile affected by scour
Date Issued
2013-12-09
Date Available
2015-05-20T12:32:48Z
Abstract
Scour around bridge foundations is one of the leading causes of bridge failure. Up until recently, the monitoring of this phenomenon was primarily based around using underwater instrumentation to monitor the progression of scour holes as they develop around foundation systems. Vibration¿based damage detection techniques have been used to detect damage in bridge beams. The application of these vibration based methods to the detection of scour has come to the fore in research in recent years. This paper examines the effect that scour has on the frequency response of a driven pile foundation system, similar to those used to support road and rail bridges. The effect of scour on the vibration characteristics of the pile is examined using laboratory and field testing. It is clear that there is a very clear reduction in the natural frequency of the pile as the severity of scour increases. It is shown that by combining state-of-the-art geotechnical techniques with relatively simple finite element modelling approaches, it is possible to accurately predict the natural frequency of the pile for a given scour depth. Therefore, the paper proposes a method that would allow the estimation of scour depth for a given observed pile frequency.
Sponsorship
European Commission - Seventh Framework Programme (FP7)
Higher Education Authority
Other Sponsorship
European Regional Development Fund (ERDF)
Type of Material
Journal Article
Publisher
Elsevier
Journal
Journal of Sound and Vibration
Volume
332
Issue
25
Start Page
6685
End Page
6702
Copyright (Published Version)
2013 Elsevier
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
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130
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