A Rational Basis for the Selection of Ice Strengthening Criteria for Ships. Volume I.

摘要

This report presents the results of a study to develop the basis for rational selection of ice strengthening criteria for vessels. Volume I describes sources and differences between ice strengthening criteria in use by various classification societies, and Government regulations such as Canadian Artic Pollution Prevention Regulations, and Swedish-Finnish Winter Navigation Board Regulations. A comparison of the different criteria is presented on the basis of a relative weight and relative cost. Effectiveness of the criteria is evaluated on the basis of statistical ice damage data and on a sample of individual ice damage cases. In addition, a comparison of different materials and fabrication techniques used for ice strengthening is presented. Deficiencies in current ice strengthening procedures are identified and a rational procedure for selecting appropriate ice strengthening criteria is presented. In addition, recommendations for research needed to improve current ice strenghtening criteria are described. Volume II contains the appendices to the report including maximum and average ice conditions by month, tabular data, and a review of methods for damage analysis.