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dc.contributor.authorFutai, MM
dc.contributor.authorDong, J
dc.contributor.authorHaigh, Stuart
dc.contributor.authorMadabhushi, Gopal
dc.date.accessioned2018-10-03T04:44:17Z
dc.date.available2018-10-03T04:44:17Z
dc.date.issued2018-12
dc.identifier.issn0267-7261
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/283053
dc.description.abstractMonopiles are one of the most commonly used offshore foundation for wind turbines. Their static capacity, p-y curve and cyclic loading behaviour have been studied using 1g tests and centrifuge tests, but there is little experimental data regarding their natural frequency, especially using centrifuge testing. The design of offshore wind turbine foundations is largely governed by natural frequency as resonance due to cyclic loading can cause damage and even failure. Understanding the dynamic response of the monopile under free vibration is thus critical to design. This paper presents the results of novel monopile (large diameter) and single pile (small diameter) tests in a centrifuge to for the first time directly determine the natural frequency (fn) of the pile-soil system. An experimental methodology was used to define the natural frequency via measured acceleration and force time histories and their fast Fourier transforms (FFT) under a force applied at a controlled frequency. The effects of pile diameter, embedded length, free length of the tower and soil density on fn were investigated in the centrifuge tests. The same models used in the centrifuge test at 50 g were also tested at 1 g in order to assess the relevance of earlier 1 g investigations into system behaviour. The measured natural frequency of wind turbine monopiles in centrifuge models during harmonic loading from a piezo-actuator, confirmed that soil structure interaction at an appropriate stress level must be taken into account to obtain the correct natural frequency. The experimental data was compared to theoretical solutions, giving important insights into the behaviour of these systems.
dc.description.sponsorshipSão Paulo Research Foundation Brazilian National Council for Scientific and Technological Development
dc.publisherElsevier BV
dc.titleDynamic response of monopiles in sand using centrifuge modelling
dc.typeArticle
prism.endingPage103
prism.publicationDate2018
prism.publicationNameSoil Dynamics and Earthquake Engineering
prism.startingPage90
prism.volume115
dc.identifier.doi10.17863/CAM.30416
dcterms.dateAccepted2018-08-03
rioxxterms.versionofrecord10.1016/j.soildyn.2018.08.007
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2018-12-01
dc.contributor.orcidHaigh, Stuart [0000-0003-3782-0099]
dc.contributor.orcidMadabhushi, Gopal [0000-0003-4031-8761]
dc.identifier.eissn1879-341X
rioxxterms.typeJournal Article/Review
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/H013857/1)
rioxxterms.freetoread.startdate2019-12-01


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