Global Ice Loads on the Lighthouse Norströmsgrund in the Winter 2001

This paper describes a cylindrical structure, Norströmsgrund in a marine environment installed with 9 load measuring panels. The load measuring system covers 162± of the perimeter of the cylinder. With uni-directional ice drift against the structure about 180± of the structure perimeter may be affected by ice. Thus the estimated global load will depend on the number of panels that are involved in the ice-structure interaction. The first part of this paper deals with decomposition of forces and how to calculate the global ice load from the local panel components. A mirror technique for estimation of the global loads is described. The secound part deals with analyses of full-scale ice load measurements from the lighthouse Norströmsgrund, and the 14 highest global peak loads during that winter are analysed as well as 17 selected peak loads from events with crushing level ice. A major parameter for ice loads is the ice strength that is highly affected by the ice temperature. Thus the 14 global peak loads are correlated with the corresponding air temperatures as well as the effective pressure from events with crushing level ice are correlated with ice drift speeds. The effective pressure seems to decrease when the drift speed increases as well as the pressure seems to decrease when the ice thickness increase.

• Record URL:
  http://www.poac.com/Papers/POAC03_V2.zip
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9788274820623
• Supplemental Notes:
  • Abstract reprinted with permission of the International Conference on Port and Ocean Engineering Under Arctic Conditions (POAC).
• Corporate Authors:

  Port and Ocean Engineering under Arctic Conditions (POAC)

  ,    
• Authors:
  • Bjerkås, M
  • Moslet, P O
  • Jochmann, P
  • Løset, S
• Conference:
  • 17th International Conference on Port and Ocean Engineering under Arctic Conditions (POAC'03)
  • Location: Trondheim , Norway
  • Date: 2003-6-16 to 2003-6-19
• Publication Date: 2003

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References;
• Pagination: 10p
• Monograph Title: POAC '03: Proceedings of the 17th International Conference on Port and Ocean Engineering under Arctic Conditions
• Serial:
  • Proceedings of the International Conference on Port and Ocean Engineering Under Arctic Conditions
  • Publisher: Port and Ocean Engineering under Arctic Conditions (POAC)
  • ISSN: 0376-6756
  • EISSN: 2077-7841
  • Serial URL: http://www.poac.com/PapersOnline.html

Subject/Index Terms

• TRT Terms: Decomposition; Drift ice; Ice phenomena; Lighthouses; Loads; Winter
• Subject Areas: Environment; Marine Transportation; I15: Environment;

Filing Info

• Accession Number: 01583376
• Record Type: Publication
• ISBN: 9788274820623
• Files: TRIS
• Created Date: Dec 23 2015 8:09AM