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Sea Ice Indentation Accounting for Strain-Rate Variation

by Seng-Kiong Ting, MIT, Dep of Civil Engineering, Cambridge, MA, USA,
S. Shyam Sunder, MIT, Dep of Civil Engineering, Cambridge, MA, USA,



Document Type: Proceeding Paper

Part of: Civil Engineering in the Arctic Offshore

Abstract:

Two levels of ice loading are typically considered in the design of drilling and production platforms for the Arctic. Global ice pressures govern the overall structural geometry and dimensions as well as the foundation design, while local pressures are likely to dictate wall thicknesses and local framing, and may well govern structural cost. Global and local indentation pressures in the creeping mode of sea ice deformation are obtained, accounting for the spatial variation of strain-rates. Two approximate methods of analysis are considered; the upper bound and strain path methods. Theoretically postulated velocity fields required in the analysis are calibrated with field measurements. Sea ice behavior is described by a multi-axial power-law creep model and by the multi-axial extension of a new uniaxial model with accounts for both hardening and softening behavior. Results are compared with previously published indentation formulas.

Subject Headings: Strain | Sea ice | Offshore platforms | Ice | Strain rates | Creep | Strain hardening and softening | Arctic

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