关键词: 海上, 采油, 平台, 断裂, 可靠性, 评估, 冰载

Abstract: Offshore production platforms in Bohai Gulf experience ice loading for more than three months each year.The ice load on a platform is much larger than any other environmental loads such as those from waves,current,wind or even earthquake.Therefore,reliability analysis,especially fracture reliability analysis,for the design of fixed production platforms in ice environment or under extremeice-loads is required to be conducted.This paper develops a reliability model to calculate the residual strength concerned with temperatures.It gives a probability distribution of fracture toughness CTOD valueδcwhich accounts for the residual strength of the components at different temperatures.The probability distribution of the maximum stress in the component Which depends on the ice thickness and ice compression strength is also given.According to this reliability model,a calculation method for the reliability of platform components is presented and a computation example is given to show the assessment process.

Key words: offshore, production, platform, fracture, reliability, assessment, ice load