海洋石油平台结构抗疲劳断裂的概率损伤容限设计

Fatigue is one of the most serious and most important failure modes of marine and offshore, aeronautical and automotive structures. The target of this project is to establish a modern probabilistic damage tolerance design method for offshore structures against fatigue and fracture. And the project is divided into three parts. First, to establish a new fatigue loading counting method in which the loading sequence can be taken into account, so it will be superior to the traditional rain flow counting method. Second, to establish a new probabilistic model of fatigue crack iniation and growth of offshore structures under the combination of various stochastic loading time histories including wave, wind and current, etc. Third, to establish a probabilistic damage tolerance design method for structures and take all the uncertainties into consideration such as the randomness of initial and final crack's length, crack growth ratio, etc. And a systematic procedure of reliability based inspection and maintenance of offshore structures will be established at last.

本项目是目前国内外研究的热点和难点，研究内容有三部分：1研究结构疲劳载荷的概率组戏椒ú⒔⒈饶壳暗挠炅鞣ǜ酉冉难吩睾杉剖ǎ?建立平台构件在波浪力等随机时间历程加载下裂纹扩展的随机模型；3研究在初始缺陷等随机扰动下的结构完整性维修策略⒔峁箍蛊＠投狭训母怕仕鹕巳菹奚杓品椒ā１鞠钅坑兄匾难鹾途媒ㄉ枰庖濉