Author(s): Masataka Tatsuta; Tetsuo Kimura
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Abstract: This report outlines the study made through experiments and by a non-linear finite element analysis on the ice-structure interaction of steel frame jacket structure which are being most frequently used as an offshore platform for the production of petroleum. The evaluation methods for ice load acting on frame structures have not been established and the phenomena described below make the ice load estimation complicated: 1. There is a possibility that ice load increases significantly when an ice sheet adfreezes to the structural members. 2. The configuration of the members may interfere with the smooth movement of an ice sheet, resulting in load increase. 3. The space between the frames may be filled with ice. This study was particularly focused on the adfreezing phenomenon of ice as well as the restraining effects caused by member configuration or contact between ice and members. Failure mode of adfrozen ice was clarified by testing a single leg and 4-legged structure. In addition, it was found that compared with normal crushing failures, the constraining of the obstructions in the vertical direction by adfrozen ice significantly increased the ice load.
Year: 1988