The authors conducted the short-term measurement of ice load exerted on the hull of icebreaker PM Teshio of Japan Coast Guard in 1999. Measurements were conducted in the selected vast ice floes in the south Sea of Okhotsk, near the coast of Hokkaido, Japan. Local ice load experienced by six transverse frames were measured using a pair of shear strain gauges. The measured maximum ice load attains to about 750kN/m, which is above the design ice load specified by the class IA-Super in the Finnish-Swedish Ice Class Rules. This sporadic event was observed in the bow area during the continuous icebreaking of 0.49m-thick ice. The magnitude and distribution of local ice load was discussed in relation to the icebreaking mode, propulsion power, and advancing speed.
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