CAJ | 학술논문

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.
침대갑판결구수압굴곡적실효모식,제출일충팽격재하작용하함선결구적가고성분석방법.기우수궤과정이론,계입팽격재하화파랑재하폭치적상관성,건립료함선재팽격、파랑급정수재하연합작용하갑판실효공능함수적수궤과정모형.채용상천솔급병련계통가고성분석방법구해차수궤과정적가고성.통과산례분석료함선결구적조니솔、팽격솔급재하상관계수대결구가고성적영향.결과표명,결구적조니솔결정료팽격재하대가고성적영향정도.동시대갑판결구각주요실효모식적가고성진행계산,발현가강근측경실효시최위험적.해방법장위합리평고함선결구적가고성제공이론삼고의거.
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 reli-ability were analyzed through an example, the results indicate that the damping rate decides the influ-ence of slamming load on the reliability. The reliabilities of all primary failure modes were also calculat-ed, 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.