Author(s): K. R. Croasdale; R. Frederking; B. Wright; G. Comfort
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Keywords: No Keywords
Abstract: Pack ice driving forces are synonymous with the internal stress that can be transmitted through pack ice. It is an important parameter in ice movement modelling as well as in predicting ice loads on structures. In the latter situation, ice loads due to extreme ice features may be limited by the pack ice driving forces pushing these features against a structure. In recognition of this possible limiting mechanism, research was initiated in 1986 to measure the internal stresses in a relatively uniform multi-year floe within converging pack ice. This type of project has now been repeated several times and a significant number of ice pressure events have now been gathered. In addition, lower-bound values for the forces driving multi-year floes frozen within first year ice have been inferred from several loading situations on the Molikpaq caisson structure in the Canadian Beaufort Sea. This paper describes work to examine the collective data measured to date on pack ice forces. The data are reviewed in the context of how pack ice forces might be averaged spatially to give an effective size effect across various widths of influence. The effects of ice thickness and boundary conditions are also discussed. Finally, the importance of pack ice forces in the context of ice loads is revisited in the context of the insights obtained from the measured data.
Year: 1992