Nonlinear loading phase in ice indentation

Tuomo Kärnä, Merja Sippola

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    2 Citations (Scopus)


    The global ice load acting on a wide offshore structure depends on the spatial correlation of the local Ice forces. To account for the correlation effects, a nonlinear model is developed for the loading phase of the dynamic ice-structure interaction process. The model is based on a series of laboratory tests where an indentor was pushed against a 100 mm thick sheet of freshwater ice. The analysis of experimental data shows that the strain-softening feature of the loading phase can be represented using a polynomial of the third order. The nominal compressive strength seems to increase slightly with the loading rate. Furthermore, an effective compressive modulus of the near field area at the ice edge exhibits a clear increase with an increase of the loading rate. The new loading model is incorporated in a numerical model for dynamic soil-structure-ice interaction.
    Original languageEnglish
    Title of host publicationThe proceedings of the Sixth (1996) International Offshore and Polar Engineering Conference
    EditorsJin S. Chung
    Place of PublicationGolden
    PublisherInternational Society of Offshore and Polar Engineers ISOPE
    ISBN (Print)978-1-880653-24-1
    Publication statusPublished - 1996
    MoE publication typeA4 Article in a conference publication
    Event6th International Offshore and Polar Engineering Conference (ISOPE) - Los Angeles, United States
    Duration: 26 May 199631 May 1996


    Conference6th International Offshore and Polar Engineering Conference (ISOPE)
    Country/TerritoryUnited States
    CityLos Angeles


    • offshore structures
    • ice forces
    • numerical modelling
    • ice failure
    • loading rate
    • nonlinear phenomena


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