ANALYSIS OF THE STRUCTURE OF THE PROPOSED CCG POLAR CLASS 8 ICEBREAKER UNDER EXTREME ICE LOADS

The Canadian Coast Guard is proposing the construction of a Polar icebreaker to the standard of Class 8 under the Canadian Arctic Shipping Pollution Prevention (CASPP) Regulations. Evidence indicates that the current CASPP Regulations, which provide guidance on the minimum structural requirements for icebreaking vessels, may not be adequate to ensure continued long-term safe and undamaged operation in heavy icebreaking conditions. The Canadian Coast Guard Polar 8 Icebreaker Project Office therefore commissioned a review of the structural design of the proposed vessel under extreme ice impact loads and the very large propulsion power available. The study addressed, among other aspects, local structural response at the bow of the vessel as well as the total hull girder response under impact loads such as may be experienced during heavy ramming. This paper describes the rationale for the selection of the extreme ice loads on the hull, and presents a real application of recent experience in ship/ice interaction to a new design. In this respect, the paper not only proposes designing beyond the current regulation when designing to higher ice classes for which there is no operating experience, but provides guidance on an appropriate technique for applying recent research results.

• Supplemental Notes:
  • Transactions paper
• Authors:
  • Glen, I F
  • Daley, C G
  • Tam, G
• Publication Date: 1985

Media Info

• Features: References;
• Pagination: 19 p.
• Serial:
  • Society of Naval Architects and Marine Engineers-Transactions
  • Volume: 93
  • Publisher: Society of Naval Architects and Marine Engineers

Subject/Index Terms

• TRT Terms: Design; Ice; Icebreakers; Impact loads; Loads; Structural analysis
• Identifier Terms: United States Coast Guard ships
• Uncontrolled Terms: Design criteria
• Geographic Terms: Canada
• Old TRIS Terms: Extreme loads; Ice loads
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00651474
• Record Type: Publication
• Source Agency: Maritime Technical Information Facility
• Files: TRIS
• Created Date: Jul 21 1994 12:00AM