Abstract:

The dynamic reliability of offshore platform within its life cycle was analyzed. Three dynamic reliability models in consideration of fracture failure, corrosion failure and both of them were proposed. The dynamic fatigue reliability to platform system was investigated. The corresponding assessment methods and the relative formulae were given. The investigated example illustrated the validation of the proposed method. A new method to prediction of fatigue stress of offshore platform was proposed by combining the spectral method with the time domain method. The new method possesses the advantages of less computation work and more simple application.

Key words: offshore platform, dynamic reliability, corrosion failure, fracture failure, fatigue reliability, evaluation method

摘要：

对海洋平台寿命周期内的动态可靠性进行了研究,提出了单独考虑断裂、腐蚀失效以及同时考虑两种失效模式相互作用的3种动态可靠性分析模型。在此基础上,对平台系统的疲劳可靠性进行了研究,给出了相应的评估方法和计算公式。提出了一种谱分析与时间域相结合的疲劳应力分析方法。该方法结合了两者的优点,一方面可以较好地考虑系统的非线性,同时有效的减少计算工作量,便于实际工程计算。

关键词: 海洋平台, 动态可靠性, 腐蚀失效, 断裂失效, 疲劳可靠性, 评估方法