Local Pressure in Ice-Structure Interactions

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by Frank G. Bercha, F. G. Bercha & Associates Ltd, Calgary, Alberta, Canada,
Thomas G. Brown, F. G. Bercha & Associates Ltd, Calgary, Alberta, Canada,
M. S. Cheung, F. G. Bercha & Associates Ltd, Calgary, Alberta, Canada,

Document Type: Proceeding Paper

Part of: Civil Engineering in the Arctic Offshore

Abstract: Two models for the determination of local pressures during marine ice or iceberg collisions with bottom-founded structures are presented. The first model is a two-dimensional analytical model based on simplifying assumptions regarding ice stiffness and strength which provides a quasi-static distribution of local ice-structure pressures. The second model is a three-dimensional finite element model which utilizes an n-type yield function that appears to give an accurate model of the failure of ice in biaxial or uniaxial states of stress. The finite element model is used to analyze the ice-structure contact footprint and the behaviour of the ice behind the contact area. The structural response may be characterized as elastic or inelastic and both local and global displacements are considered. Examples of model uses are given.

Subject Headings: Ice | Finite element method | Offshore structures | Model accuracy | Three-dimensional models | Structural analysis | Two-dimensional models | Structural models | Arctic

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