Fatigue Reliability Analysis of Offshore Structures in Ice Environment

摘要

In Bohai Gulf, some offshore platforms and other installations have collapsed by sea ice due to fatigue and fracture of the main supporting components in ice environments. This paper presents some results on fatigue reliability of these structures in the Gulf by investigating the distributions of ice parameters such as its floating direction and speed, sheet thickness, compressive strength, ice forces on the structures, and hot spot stress in the structure. The presentation also takes into account the low emperature, ice breaking modes and component fatigue failure modes to analyze the fatigue reliability of the offshore structures experiencing both random ice loading and low temperatures. The results could be applied to the design and operation of offshore platforms in Bohai Gulf.