ICE LOADS AND SHIP RESPONSE TO ICE: USCG POLAR CLASS 1982/83 DEPLOYMENT
This paper presents work toward development of local ice load criteria for icebreaking ships. A bow panel of approximately 100 sq.ft. was instrumented, being divided into 60 sub-panel areas over which uniform pressures were calculated during each impact with ice. Finite element models of the hull structure were used to develop a data reduction matrix relating the measured strains to uniform pressures. Approximately 1400 events over a preset threshold strain were recorded. Extreme pressure-area curves were developed for each event, and extreme envelopes for each of five geographical areas. Trends in peak force and peak pressure are examined in terms of ship impact speed and ice conditions. Frequency-of-occurrence tables for highest average pressure are developed as a function of impact area for each geograhpical area. A statistical analysis of the extremes of the north Chukchi Sea data indicated that the peak pressure data followed a Gumbel extreme value distribution. Finally, a non- dimensional analysis was performed on selected data, and an empirically based approach is presented for developing extreme pressure-area curves as a function of ice conditions, ship impact speeds, and the return period.
-
Supplemental Notes:
- Report; Vol.1-Report; Vol.2-Appendices; For related reports, see AN 1789, Record 2098; AN 1791, Record 2099
-
Corporate Authors:
Arctec Canada Limited
311 Legett Drive, Kanata
Ottawa, Ontario Canada K2K I28Arctec, Incorporated
9104 Red Branch Road
Columbia, MD United States 21045Maritime Administration
1200 New Jersey Avenue, SE
Washington, DC United States 20590 Transportation Development Centre, 800 Rene-Levesque Boulevard West, Suite 600
Montreal, Quebec Canada H3B 2X1 -
Authors:
- St John, J W
- Daley, C
- Blount, H
- Publication Date: 1984-12
Media Info
- Features: References;
Subject/Index Terms
- TRT Terms: Design; Ice; Icebreakers; Icebreaking; Loads
- Uncontrolled Terms: Design criteria
- Geographic Terms: Beaufort Sea; Bering Sea
- Old TRIS Terms: Chukchi sea; Ice forces; Ice loads
- Subject Areas: Design; Marine Transportation;
Filing Info
- Accession Number: 00650067
- Record Type: Publication
- Source Agency: Maritime Technical Information Facility
- Report/Paper Numbers: AI-757C, ACL-FR991C, TC-TP-6039E
- Files: TRIS, USDOT
- Created Date: Jul 21 1994 12:00AM