Dynamic soil-structure interaction of monopile supported wind turbines in cohesive soil

Domenico Lombardi, Subhamoy Bhattacharya, David Muir Wood

    Research output: Contribution to journalArticlepeer-review

    175 Citations (Scopus)

    Abstract

    Offshore wind turbines supported on monopile foundations are dynamically sensitive because the overall natural frequencies of these structures are close to the different forcing frequencies imposed upon them. The structures are designed for an intended life of 25 to 30 years, but little is known about their long term behaviour. To study their long term behaviour, a series of laboratory tests were conducted in which a scaled model wind turbine supported on a monopile in kaolin clay was subjected to between 32,000 and 172,000 cycles of horizontal loading and the changes in natural frequency and damping of the model were monitored. The experimental results are presented using a non-dimensional framework based on an interpretation of the governing mechanics. The change in natural frequency was found to be strongly dependent on the shear strain level in the soil next to the pile. Practical guidance for choosing the diameter of monopile is suggested based on element test results using the concept of volumetric threshold shear strain.
    Original languageEnglish
    Pages (from-to)165-180
    Number of pages16
    JournalSoil Dynamics and Earthquake Engineering
    Volume49
    DOIs
    Publication statusPublished - Jun 2013

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