Author(s): Mauri Maattanen
Linked Author(s): Mauri Määttänen
Keywords: No Keywords
Abstract: Ice-induced self-excited vibrations in bottom-founded structures due to laterally moving ice sheets were measured in model tests with about 1:10 scale ratio. The varied parameters were the stiffness of the structure, the mass of the superstructure and the inclination of the structure at the waterline. In all tests ice velocity was increased with constant rate to cover ice failure modes from ductile to brittle. The results of crushing tests indicate that ice-induced vibrations are the more pronounced the more there is energy interchange between the structure and ice, e. g. with flexible structures and heavy superstructures. The results prove that the frequency of crushing force is controlled by the properties of ice and the natural frequencies of the structure. The incidence angle at the waterline has its effects on the velocity when ice failure mode changes from bending to crushing with self-excited vibrations.
Year: 1984