EXPERIENCE WITH LARGE RUSSIAN ICEBREAKERS

This article is based on experience with large Russian icebreakers navigating in the Arctic. Such ships are subjected to heavy ice- induced loads over much longer periods than was the case with the earlier, smaller and slower, icebreakers which did not sail in the Arctic regularly. With these large ships, it was found that 70% of all observed damages to the hull occur in the flat part of the bottom and at the turn of the bilge. The Authors present a diagram classifying ice-induced loads together with general methods of determining the magnitudes of the loads. The article then goes on to report some results of ice-load measurements taken on board the icebreakers Moskva and Vladivostok. The measurements involved the installation of strain gauges, distributed over the bottom structure. Ice-impact loads as well as permanent deformations of the bottom shell plating were determined. Among the general conclusions of the study it is stated that when icebreakers sail in ice-covered waters which are shallow <as is often the case in Arctic voyages>, pieces of ice can be forced under the hull, causing not only impact loads but also wear of the bottom plating by ice scraping against the bottom. Such wear must be allowed for in design scantlings of the plating. Impact pressures on the hull are of relatively long duration <about 0.4 sec.>as compared with the frequencies of natural vibration of the bottom structure, & they can therefore be regarded as static loads.

• Supplemental Notes:
  • Sudostroenie, No.11 <1982>, p.9 <Nov.> (3 pp., 5 diags., 1 graph, 7 refs.)
• Authors:
  • Barabanov
• Publication Date: 1982

Language

• Russian

Subject/Index Terms

• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00711033
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM