The process of the dynamic interaction of a drifting ice cover with offshore structures accompanied by ice failure and formation of ice forces complicated with probabilistic character. The nature of ice failure depend on dimensions of interacting elements, dynamic and kinematic parameters of the process. The complication is conditioned by its complexity and high changeability of the ice properties. The numerical model describing process of ice sheet damage is accompanying by split of ice pieces was offered. Such kind of ice damage is sufficiently typical for this problem. The numerical model is based on failure specific energy of ice as a criteria of process. This model let to describe the initial penetration process of structure into ice sheet. The model was verified on results of experimental research. The results of comparison gave satisfactory coincidence with the absolute contact force and its frequencies. This model let to decide dynamic problem of the ice structure interaction. The results of numerical studies is presented.
As known, the ice force during interaction with rigid vertical piles depend on many parameters. The main among them are aspect ratio, strain rate, drift velocity, ice strength, structural shape etc. The ice force analysis must be based on mathematical model accounting for all principal features of physical phenomena which is close to experimental results in quality and quantity. Up to date there are known the two principal approaches considering the auto-vibration and forced vibration. The first one was developed by professor Maattenen and others and can be considered as very productive. But it is impossible impossible to describe the interaction process in all range of parameter changes for ice and structure. It is believed also from experimental data.
In this work the phenomenological model is presented accounting for a number of experimentally defined laws. This model belong to second approach.
