ANALYSIS OF EXTREME ICE LOADS MEASURED ON USCGC POLAR SEA

Measured ice loads have been obtained from an instrumental panel on the bow of the USCGC POLAR SEA. The panel covers an area of 9.1 m and is capable of resolving pressures over an area of 0.15 m. During early 1983, the POLAR SEA conducted trials in the Bering Sea, Chukchi, and Beaufort Seas in level ice, pressure ridges, and thick multilayer ice. This paper presents an analysis of the ice forces and pressures, based on probability. The data for thick multilayer ice are analyzed and presented for extreme-value statistics of pressure versus area. A theoretical model of the ship/ice impact interaction was used to extend the statistical relationships to ships of other sizes. A general algorithm, therefore, is proposed that describes the statistics of ice pressure as a function of ship displacement, velocity, and stem angle, valid for any ship in thick multilayer ice. The general formulation is extended to all types of sea ice through the analysis of nondimensional ice loads for a range of ice thicknesses and ice strengths.

• Supplemental Notes:
  • Transactions paper
• Corporate Authors:

  Maritime Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Daley, C G
  • St John, J W
  • Seibold, F
• Publication Date: 1984

Media Info

• Features: References;
• Pagination: 12 p.
• Serial:
  • Society of Naval Architects and Marine Engineers-Transactions
  • Volume: 92
  • Issue Number: 1984
  • Publisher: Society of Naval Architects and Marine Engineers

Subject/Index Terms

• TRT Terms: Ice; Icebreakers; Impact loads; Loads; Pressure
• Uncontrolled Terms: Pressure distribution
• Old TRIS Terms: Extreme loads; Ice loads
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00651272
• Record Type: Publication
• Source Agency: Maritime Technical Information Facility
• Files: TRIS, USDOT
• Created Date: Jul 21 1994 12:00AM