Offshore structure made of concrete in ice-covered sea areas is likely to meet an abrasion due to sea ice movement, and needs to be a light weight because of long carriage for its installation. Therefore, it is necessary to determine the thickness of covered concrete with high accuracy. The method to estimate an amount and area of abrasion is shown in considering both local ice pressure distribution and change of water level due to tide. The way to reduce the abrasion is also proposed.
