Ice-induced non-structure vibration reduction of jacket platforms with isolation cone system

The jacket platforms are strong enough to resist extreme ice forces in Bohai Sea, China. However, ice-induced vibration acceleration has been observed and caused non-structure failure such as human discomfort and gas leakage due to flange loosing of pipes in winters. As a method of reducing ice-induced vibrations, this paper proposed an isolation cone system composed of cones, springs and dampers, which is located on the pile of jacket platforms at sea level. In order to examine the ice-induced vibration acceleration reduction effectiveness of the isolation cone system for jacket platforms, a numerical simulation is conducted to JZ20-2MUQ jacket platform as an example. It is shown from the numerical study and observed data that the isolation cone system is effective in reducing the ice-induced vibration acceleration responses and avoiding non-structure failure of jacket platform structures.