Ice forces on downward breaking cones

Lau, Michael Wai-Hung (1989) Ice forces on downward breaking cones. Masters thesis, Memorial University of Newfoundland.

[English] PDF (Migrated (PDF/A Conversion) from original format: (application/pdf)) - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (44MB) [English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. (Original Version)

Abstract

Structures located in ice-covered waters may use a conical form at the waterline to deflect wind and current driven ice. As the ice fails and displaces around the cone, the structure, together with its anchors and foundations, is subjected to multi-directional loads, and to moments which depend on the effective point of application of the ice load. This thesis reports the results of a series of model tests on downward breaking cones in level ice. The tests were carried out in the 96 m ice tank at the Institute for Marine Dynamics, in EGAD model ice. Displacements, bidirectional loads, and moments were measured in level ice for twenty-nine sets of different experimental conditions yielding a total of 142 data points. The value of this test series arises from the range of parameters which were examined. Ice thickness, flexural strength, cone angle, waterline diameter, ice-cone friction coefficient, advancing speed, and model set-up were systematically varied and their effects examined. In addition, tests with level ice were repeated with pre-sawn ice. Qualitative information about ice motion around the structure was also collected. The results are compared with available analytical predictions and model scale measurements from the literature.

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