Three-dimensional pushover analysis of jack-up platform

Steven Cheng, Mehrdad Kimiaei, Mark Cassidy

    Research output: Chapter in Book/Conference paperConference paperpeer-review

    Abstract

    Jack-ups, as the name indicates, are self-elevating units consisting of a floatable hull and, usually, three truss work or circular legs. As a mobile structure, jack-ups are mainly utilized for oil and gas exploration and maintenance purposes in shallow to medium water (up to 120 meters), though they have recently seen application in the construction of offshore wind energy infrastructure.

    The use of the finite element method for structural analyses of jack-ups is a common practice. However, most jack-up models remain elastic with the yielding of structural members or even the soil around the spudcan not accounted for. This paper describes the development of a comprehensive and integrated elasto-plastic jack-up model in ABAQUS [1]. This model is representative of a modern jack-up structure, and it can capture geometrical nonlinearities and plastic behaviour of the structural and soil materials.

    In this study, the discretisation of the structural elements, the choice of elements, the elasto-plastic behaviour of the material, and the mesh generation are described. Numerical results of a series of static pushover analyses for this sophisticated model under extreme loads are presented. The sensitivity of the results to the structural configurations is discussed. For instance, the choice of sectional properties of the chord member and the assumption of the behaviour of the spudcan (jack-up foundation)-soil interaction are shown to be critical to the prediction of the ultimate strength of the platform and the progressive failure mechanism.

    In conclusion, generic issues associated with static pushover analyses of jack-ups are discussed and possible numerical solutions are proposed.
    Original languageEnglish
    Title of host publicationProceedings of the ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering
    Place of PublicationUSA
    PublisherASME International
    Pages365-373
    Number of pages9
    Volume2
    ISBN (Print)9780791844892
    DOIs
    Publication statusPublished - 2012
    EventASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering - Rio de Janeiro, Brazil
    Duration: 1 Jul 20126 Jul 2012

    Conference

    ConferenceASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering
    Country/TerritoryBrazil
    CityRio de Janeiro
    Period1/07/126/07/12

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