Author(s): S. Kioka; Y. Yamamoto; K. Sugawara; T. Endo; T. Takeuchi
Linked Author(s): Keiichi Sugawara
Keywords: No Keywords
Abstract: This paper reports on the results of a medium-scale experiment regarding the impact applied by ice floes against a pile structure using free-falling ice floes with a length of 0.3 to1.2m and a thickness of 0.15m under various conditions as a follow-on from our previous experiment and numerical simulation using the 3-D discrete element method (DEM). When ice causes brittle failure/splitting, and fragments move freely after impact with a structure (especially when the ice floe is large compared to the structure), the impact load or the impulse was small compared to cases without failure, and was presumed to become a constant value regardless of the level of the kinetic energy or the momentum. We also developed a fundamental numerical method to simulate the impact of ice on a structure. In this method, DEM with tension resistance among particles and FEM were applied to sea ice and a structure respectively. The simulation results showed a close correlation with the experimental outcome in terms of the time-series change of impact loads, the dynamic failure processes of the ice floe and the response of the structure to impact. The calculated results also agreed well with the trends of the experimental results in this study, such as the relationship between the kinetic energy and the ice load.
Year: 2010