ICE LOADS AND SHIP RESPONSE TO ICE: A SECOND SEASON; FINAL REPT

The report presents the results and final analysis of the local ice load measurement conducted on four deployments aboard the USCGC POLAR SEA between 1982-84. Data were collected in first year and multiyear ice in the Bering, Chukchi, and Beaufort Seas and first year level ice in McMurdo Sound, Antarctica. The objective of the most recent data collection effort (Beaufort Summer 84), was to gather additional data in heavy first year and multi-year ice in the Beaufort and North Chukchi Seas. A total of 337 events were analyzed of which 32 are known multi-year ice impacts. Level ice conditions varied in thickness from 2 to 3 ft (.6 to .9 m) and pressure ridges were transitted with sail heights as high as 8 ft (2.4 m). Speeds of advance during impacts varied from less than 1 kt to 7.5 kts (0.5 to 3.9 MPS). The highest single subpanel pressure measured was 1041 psi (7.2 MPa) and the highest peak force measured was 374 LT (380 MT). These values are about 25% smaller than the peak values for multi- year ice impacts measured on previous deployments. A statistical analysis of extreme pressures and forces was performed for the data collected on all four deployments and is presented in Volume II. Pressures over one subpanel, four subpanels, and total forces were fitted to 3 parameter extreme value distribution. The results of the statistical analysis were then used to suggest ice load criteria in support of icebreaking ship design and hull design regulations for icebreaking ships.

  • Supplemental Notes:
    • Also pub. as ARCTEC Canada Ltd., Kanata (Ontario) rept. no. ACL- 1723AC. See also PB91-153635.; Prepared in cooperation with ARCTEC Canada Ltd., Kanata (Ontario). Sponsored by Ship Structure Committee, Washington, DC., Maritime Administration, Washington, DC., and Transportation Development Centre, Montreal (Quebec).
  • Corporate Authors:

    ARCTEC Engineering, Incorporated

    Columbia, MD  United States 

    Arctec Canada Limited

    311 Legett Drive, Kanata
    Ottawa, Ontario  Canada  K2K I28

    Ship Structure Committee

    National Academy of Science, 2101 Constitution Avenue, NW
    Washington, DC  United States  20418

    Maritime Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    Transportation Development Centre

    Ottawa,   Canada 
  • Authors:
    • Daley, C
    • StJohn, J W
    • Brown, R
    • Meyer, J
    • GLEN, I
  • Publication Date: 1990-8

Language

  • English

Media Info

  • Pagination: 138 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00666781
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: AEI-1061C; SSC-339
  • Contract Numbers: DTMA-91-84C-41032
  • Files: TRIS, USDOT
  • Created Date: Oct 3 1994 12:00AM