Author(s): S. E. Bruneau; G. B. Crocker; R. F. Mckenna; K. R. Croasdale; M. Metge; R. Ritch; J. S. Weaver
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Abstract: The forces exerted by large first year ridges and rubble fields on structures have received considerable attention for offshore installations. Particularly for large features, the load exerted by the rubble is a significant contributor to the overall load and the rubble shear strength is a key design parameter. Through extensive experiments in an indoor ice basin and field experiments in Canada and in the Sea ofOkhotsk, three methods were evaluated for measuring ice rubble strength properties. A punch technique, in which the top surface of the ice was loaded vertically downward, was first applied. The second technique involved direct shear along a horizontal plane just beneath the refrozen layer of a ridge or rubble field. The third was a pull-up test used to determine the strength of cohesive bonds between the refrozen layer and the rubble in the ridge keel. All three methods provided large-scale in silu strength measurements required as input to ridge keel load algoritiuns.
Year: 1998