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Scale Effects and Randomness in the Estimation of Compressive Ice Loads

  • Ian Jordaan
  • John Pond
Part of the Solid Mechanics and Its Applications book series (SMIA, volume 94)

Abstract

The paper deals with impacts of ice masses with ships and offshore installations, considering the higher velocities found under these circumstances. The perspective is the determination of design criteria for local and global pressures. The uncertainties associated with these estimates are addressed, and scale effects in local and global situations are considered with different but inter-related models. Non-simultaneous failure provides the explanation for scale effects in the case of local pressures, based primarily on probabilistic averaging. Global pressures, averaged over the nominal interaction area, also show a decrease with area, related to fractures in the ice. There is a need for better modelling of the physical processes in this area, and the use of probabilistic failure theories is explored.

Keywords

Scale Effect Hull Girder Offshore Mechanics Nominal Contact Area Offshore Installation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Ashby, M.F., Palmer, A.C., Thouless, M., Goodman, D.J., Howard, M., Hallam, S.D., Murrell, S.A.F., Jones, N., Sanderson, T.J.O. and Ponter, A.R.S. 1986. Nonsimultaneous failure and ice loads on arctic structures. Offshore Technology Conference pp 399–404Google Scholar
  2. Bolotin, V.V. 1969. Statistical methods in structural mechanics. Holden-Day, San Francisco. (Translated from the Russian by Samuel Aroni)zbMATHGoogle Scholar
  3. Dempsey, J.P. 1996. Scale effects on the fracture of ice. The Johannes Weertman Symposium. The Minerals, Metals and Materials Society, pp 351–361Google Scholar
  4. Dome Petroleaum Ltd., 1982. Report on full scale measurement of ice impact loads and response of the ‘Canmar Kigoriak’ — August and October 1981. Prepared by Dome Petroleum Ltd.Google Scholar
  5. Evans, A.G. 1978. A general approach for the statistical analysis of multiaxial fracture. J. Amer. Ceram. Soc. 61, 7–8, 302–308CrossRefGoogle Scholar
  6. Frankenstein, G.E., 1959. Strength data on lake ice. CRREL Technical Report 59.Google Scholar
  7. Frankenstein, G.E., 1961. Strength data on lake ice. CRREL Technical Report 80.Google Scholar
  8. Fuglem, M., Muggeridge, K. and Jordaan, I.J. 1999. Design load calculations for iceberg impacts. International Offshore and Polar Engineering Conference, Montreal, Canada, 1998. 2:460–467.Google Scholar
  9. Fuglem, M., Muggeridge, K. and Jordaan, I.J. 1999. Design load calculations for iceberg impactsInternational Journal of Offshore and Polar Engineering,1999. 9;4:298–306Google Scholar
  10. Glen, I.F. and Blount, H. 1984. Measurements of ice impact pressures and loads onboard CCGS Louis S. St. Laurent. In Proceedings, 3rd Offshore Mechanics and Arctic Engineering Symposium, ASME, New Orleans, La, III 246–252.Google Scholar
  11. Gow, A.J., Udea, H.T., Govoni, J.W. and Kalafut, J., 1988. Temperature and structure dependence of the flexural strength and modulus of freshwater model ice. CRREL Report 88–6.Google Scholar
  12. Jordaan, I.J. 2001. Mechanics of ice-structure interaction. Engineering Fracture Mechanics (in press).Google Scholar
  13. Jordaan, I.J., Maes, M.A., Brown, P.W. and Hermans, I.P. 1993a. Probabilistic analysis of local ice pressures. Journal of Offshore Mechanics and Arctic Engineering. 115:83–89.CrossRefGoogle Scholar
  14. Jordaan, I.J., Xiao, J. and Zou, B. 1993b. Fracture and damage of ice: towards practical implementation. In: Ice Mechanics — 1993, J.P. Dempsey, Z.P. Bazant, Y.D.S. Rajapakse and S.S. Sunder (eds), ASME AMD Vol. 163:251–260.Google Scholar
  15. Jordaan, I.J., Fuglem M. and Matskevitch, D.G. 1996. Pressure-area relationships and the calculation of global ice forces. Proceedings, IAHR Symposium on Ice, Beijing, China, Vol. 1, pp. 166–175.Google Scholar
  16. Jordaan, I.J. and Xiao, J. 1999a. Compressive ice failure. In: Ice in Surface Waters, H.T. Shen (ed.), Balkema, Rotterdan, Vol.2: 1025–1031.Google Scholar
  17. Jordaan, I.J., Mastskevitch, D.G., and Meglis, I.L. 1999b. Disintegration of ice under fast compressive loading. International Journal of Fracture 97: 279–300.CrossRefGoogle Scholar
  18. Kry, P.R. 1978. A statistical prediction of effective ice crushing stresses on wide structures. Proceedings of the 5th International IAHR Conference, Lulea, Sweden, Part 1:33–47.Google Scholar
  19. Maes, M.A. 1985. Extremal analysis of structural loads. Ph.D. Thesis, 1985. Memorial University of Newfoundland.Google Scholar
  20. Maes, M.A. 1992. Probabilistic behaviour of a Poisson field of flaws in ice subjected to indentation. IAHR Ice Symposium, Banff, Alberta, vol 2 pp 871–882.Google Scholar
  21. Riska, K., Rantala, H. and Joensuu, A. 1990. Full scale observations of ship-ice impact. Helsinki University of Technology, Report M-97, 1990.Google Scholar
  22. Sanderson, T.J.O. 1988. Ice mechanics: risks to offshore structures. Graham and Trotman.Google Scholar
  23. St. John, J.W. and Daley, C.G., 1984. Shipboard measurements of ice pressures in the Bering, Chukchi and Beaufort Seas. International Offshore Mechanics and Arctic Engineering Symposium, New Orleans, LA, Proceedings, (ASME), 3rd, V.3: 260–266Google Scholar
  24. Weibull, W. 1951. A statistical distribution function of wide applicability. J. Appl. Mech., 18: 293–297.zbMATHGoogle Scholar
  25. Zou, B. 1996. Ships in ice: the interaction process and principles of design. Ph.D. Thesis, 1996. Memorial University of Newfoundland.Google Scholar
  26. Zou, B., Xiao, J. and Jordaan, I.J. 1996. Ice fracture and spalling in ice-structure interaction. Cold Regions Science and Technology 24: 213–220CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2001

Authors and Affiliations

  • Ian Jordaan
    • 1
  • John Pond
    • 1
  1. 1.Ocean Engineering Research Centre, Faculty of Engineering and Applied ScienceMemorial University of NewfoundlandCanada

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