Author(s): Mauri Maattanen
Linked Author(s): Mauri Määttänen
Keywords: No keywords
Abstract: Scale model tests have proven that at certain ice velocity range the natural mode frequency of the structure can control the ice failure rate while ice is crushing against a vertical structure. Fullscale data indicates the same phenomenon. As this is a resonant type loading the dynamic response of the structure will be severe. In ice load design there is not yet any well established bound for the lock-in vibrations velocity range. The future ISO 19906 Ice load code suggests a conservative upper bound. In this paper data on scale model and full scale measurements, as well as on less accurate in-field observations is assessed. Scale-model data is extrapolated into fullscale by scaling laws. Numerical simulation model results are compared in order to find out the limiting ice velocities. Physical reasoning with parameters that control the possible lock-in vibrations is discussed.
Year: 2008