CAJ | 학술논문

在海洋平台结构疲劳强度分析的不确定因素中波浪载荷的不确定性对其影响较大,为了评估疲劳载荷计算过程中波浪载荷的不确定性文章建立了海浪谱型、波高、波浪载荷传递函数、平均跨零周期、海况发生概率和浪向等引起的波浪载荷不确定性的评估方法和公式.同时为了评估波浪载荷传递函数的不确定性进行了波浪载荷模型试验.重点对西北太平洋和中国南海的海况进行了分析计算,定量统计回归出西北太平洋的有义波高和平均跨零周期修正公式,以及中国南海不同季节海况和浪向分布规律对半潜平台波浪载荷和疲劳寿命的影响因子.最后根据波浪载荷不确定性以及结构疲劳分析中的其他不确定因素计算分析了半潜平台典型结构的疲劳可靠度.
재해양평태결구피로강도분석적불학정인소중파랑재하적불학정성대기영향교대,위료평고피로재하계산과정중파랑재하적불학정성문장건립료해랑보형、파고、파랑재하전체함수、평균과령주기、해황발생개솔화랑향등인기적파랑재하불학정성적평고방법화공식.동시위료평고파랑재하전체함수적불학정성진행료파랑재하모형시험.중점대서북태평양화중국남해적해황진행료분석계산,정량통계회귀출서북태평양적유의파고화평균과령주기수정공식,이급중국남해불동계절해황화랑향분포규률대반잠평태파랑재하화피로수명적영향인자.최후근거파랑재하불학정성이급결구피로분석중적기타불학정인소계산분석료반잠평태전형결구적피로가고도.
Uncertainties of wave loading have large proportions in analysis of structural fatigue strength for ocean platform. In this paper, the assessing methods and formulas are built for wave spectrum, sea wave height, wave loading transfer function, cross-zero period, sea state occurring possibility and wave direction due to investigate the uncertainties of wave loading during calculating fatigue loading. The wave loading model trial is taken for assessing the uncertainty of wave loading transfer function. The correcting formulas of significant wave height and mean cross-zero period in Northwest Pacific are regressed statistically after specially calculating the sea states in Northwest Pacific and South China Sea, and the influence factors of difference season sea states and principle of wave direction distribution to wave loading and fatigue life of semi-submersible are investigated. Finally, the fatigue reliability index of typical structures for semi-sub-mersible is researched on the basis of uncertainties of wave loading and the other uncertainties during structural fatigue analysis.