摘要
基于深海平台系统的耦合时域分析技术和结构可靠性理论,分析深水系泊系统在灾害性极限海况下的失效模式。根据系泊链的结构形式特点,建立破断强度的概率模型;并根据系泊链动力响应时间历程,采用广义极值理论,通过对非线性随机动力响应的数值拟合,提出建立载荷概率模型的方法。并以某半潜平台系泊系统为研究对象,通过不同极限环境条件下的分析对比,研究载荷方向对可靠性指标的影响。根据分析结果可知,在200年一遇海况下,当环境载荷方向是135°时,系统可靠性指标,已低于目标可靠性指标要求,该系泊系统处于不安全状态。
A reliability assessment method for deepwater mooring system in catastrophic sea state is presented.The failure mode of mooring system is discussed based on the time domain coupled analysis for the deep-sea platform and structural reliability theory.The probabilistic model of breaking strength is developed according to the structural form of mooring chain.A method for establishing the load probabilistic model is developed through numerical simulation of the non-linear stochastic dynamic response using generalized extreme value theory.The result of the reliability analysis in different extreme environmental conditions is compared to find out the influence of load direction on reliability index.
出处
《海洋工程》
CSCD
北大核心
2010年第4期18-25,共8页
The Ocean Engineering
基金
国家863计划资助项目(2006AA09A109-6)
关键词
深水系泊系统
灾害性海洋环境
结构可靠性
安全评估
deepwater mooring system
catastrophic ocean environment
structural reliability
assessment
