Development of a real-time hybrid testing method in a centrifuge

V. Kong, Mark Cassidy, Christophe Gaudin

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)
    250 Downloads (Pure)

    Abstract

    This paper presents a pioneering real-time hybrid testing method for geotechnical centrifuges. The method was used to investigate the behaviour of a jack-up leg reinstalled near an existing footprint, a problem that is highly non-linear, stress dependent and involves complex soil–structure interactions. By physically modelling only the footprint–leg interaction and numerically modelling the rest of the jack-up structure, the method enables a realistic account of all the parameters involved in the interaction, including the footprint geometry, soil heterogeneity and structural properties of the jack-up unit. The paper also details the three-degree-of-freedom actuators developed to model the interaction, which features controlled loads and motions along the vertical, horizontal and moment directions, and the real-time algorithm that bridges the physical and numerical models. The algorithm allows the stiffness on each axis to be varied. Testing performed at 1g and in the centrifuge, modelling jack-ups with different stiffness on the horizontal and moment axes, is presented to validate the apparatus and methodology. The hybrid apparatus and real-time testing method were found to produce much more realistic boundary constraints than previous fixed-system apparatuses, and this allowed the test results to be considerably more informative, accurate and useful.
    Original languageEnglish
    Pages (from-to)169-190
    Number of pages22
    JournalInternational Journal of Physical Modelling in Geotechnics
    Volume15
    Issue number4
    Early online date13 Nov 2015
    DOIs
    Publication statusPublished - Dec 2015

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