Numerical Analysis For Sea Ice Interacted With Conical Platform

With the increase of energy requirement, it presents the essential requirement from the design of offshore structures. Many researchers have devoted their efforts to the interactions between sea ice and offshore platform. In order to avoiding ice-induced vibration, explicit software LS-DYNA is used to simulate the failure process caused by sea ice impacted with conical platform.Simulate results indicates that the obtained bending process is consistent with in-situ test. The ice break length belongs to the typical range of in-situ measurements. Ice force exhibits the metrical triangle shape. The simulated results also give the vibration information in platform, such as displacement and acceleration history etc.The parametric analyses which affect ice failure process and ice force are performed. The ice-cone contact width is not a sensitive factor to the transformation of ice failure mode and break length. The effects of conical angle, ice thickness, elastic modulus and ice velocity also are considered. The simulate result also shows that there is no compress failure process at up-down conical intersection. But the peak force is high compare with other contact positions.The simulations of two platforms, Bohai JZ20-2 MUQ and NW, are performed in the fifth section, ice failure process, break length, ice force and vibration are consistent with true field experiments. The present results provide the reference to platform design.