摘要
针对载荷相关性在船体结构可靠性分析中的影响,提出一种可靠性分析模型。基于随机过程理论,建立了船体梁在砰击、波浪及静水载荷联合作用下功能函数的随机过程模型,考虑波浪载荷和砰击载荷幅值的相关性,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。通过算例分析载荷相关性对于舰船结构可靠性的影响,并讨论了结构失效概率随结构阻尼率、砰击率的变化趋势,最后计算分析了舰船结构各种失效模式的可靠性。结果表明:结构的阻尼率决定了载荷相关性对结构可靠性的影响大小,且舰船结构的受压屈曲破坏是结构失效的主要模式。
A reliability analysis model is developed when the load correlative was included in the ship structure reliability analysis. Based on the random process theory, this paper sets up the random process model for the performance function of the ship hull girder subjected to slamming, wave-induced and still water loads, when the correlation of the peak value of slamming and wave-induced load is considered. The reliability analysis is performed by means of up-crossing analysis and parallel system reliability method. The coefficient of correlation influences on the reliability are analyzed, and the trend of failure probability about damping ratio, slamming rate are discussed, separately. Finally, the reliability of all failure modes are also calculated. The results show that the damping ratio dominated the influence of load correlative on the reliability, and the buckling failure is the primary failure mode.
出处
《工程力学》
EI
CSCD
北大核心
2009年第10期44-49,共6页
Engineering Mechanics
关键词
可靠性分析
载荷相关性
随机过程
上穿率分析方法
船体梁
reliability analysis
load correlative
random process
up-crossing analysis method
ship hull girder
