摘要
针对甲板结构受压屈曲的失效模式,提出一种砰击载荷作用下舰船结构的可靠性分析方法。基于随机过程理论,计入砰击载荷和波浪载荷幅值的相关性,建立了舰船在砰击、波浪及静水载荷联合作用下甲板失效功能函数的随机过程模型。采用上穿率及并联系统可靠性分析方法求解此随机过程的可靠性。通过算例分析了舰船结构的阻尼率、砰击率及载荷相关系数对结构可靠性的影响。结果表明,结构的阻尼率决定了砰击载荷对可靠性的影响程度。同时对甲板结构各主要失效模式的可靠性进行计算,发现加强筋侧倾失效是最危险的。该方法将为合理评估舰船结构的可靠性提供理论参考依据。
Considering the buckling failure modes of ship deck,a method of assessing the reliability of ship structure under slamming load was proposed.The random process model of deck failure function under the combining actions of slamming,wave-induced and stillwater loads was set up based on the random process theory,considering the correlation of amplitudes of slamming and wave-induced loads. The reliability of the process was solved by up-crossing rate and parallel system reliability analysis method.The influences of damping,slamming rates and correlation coefficient of the loads on the reliability were analyzed through an example,the results indicate that the damping rate decides the influence of slamming load on the reliability.The reliabilities of all primary failure modes were also calculated,the results show that the stiffener tripping failure is the most dangerous.The method can provide theoretical foundation for evaluating the structural reliability of ship reasonably.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2009年第12期1668-1673,共6页
Acta Armamentarii
基金
国家自然科学基金委员会和中国工程物理研究院联合基金项目(10276013)
江苏省重点实验室项目(163220154)
关键词
概率论
可靠性分析
砰击载荷
随机过程模型
上穿率分析方法
probability reliability analysis slamming load random process model up-crossing analysis method
