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 The longitudinal wave induced stress which is the main part of hull girderstrength has been measured by the statistical strain apparatus fixed on severaldry cargo ship which make a voyage from China to Europe.Based on longterm accumulation of the data of stress,we apply themethod of mathematical statistics to analyse them,and come to the conclusionthat the frequency function of stress for the statistical sample of one voyagecoincide with negative exponential distribution.A method to predicate... The longitudinal wave induced stress which is the main part of hull girderstrength has been measured by the statistical strain apparatus fixed on severaldry cargo ship which make a voyage from China to Europe.Based on longterm accumulation of the data of stress,we apply themethod of mathematical statistics to analyse them,and come to the conclusionthat the frequency function of stress for the statistical sample of one voyagecoincide with negative exponential distribution.A method to predicate the maximun stress level for ship's whole life isalso presented in this paper.  船舶的波浪诱导纵向应力是决定船舶纵强度的重要组成部分。本文通过安装在船舶上的统计应变仪,长期积累,波浪诱导纵向应力数据,应用数理统计方法对测量数据进行分析,得到常规的万吨级干货船在中—欧航线上,以一个航次为统计样本的波浪诱导纵向应力符合负指数分布,并求得在船令期内船舶可能遭遇到的最大波浪诱导纵向应力值。  The causes for the cracks Classes III & IV in the permanent exposure area and the working surface of the dam section of the firstphase longitudinal cofferdam are mainly attributed to the long interval foundation consolidation grout and afterwards cold wave attack, excessive high ratio of length to width in structure, foundation restraining stress and cold wave induced stress. By change of steel reinforcement arrangement, the cracks would not have any impact on the integrity of the structure.... The causes for the cracks Classes III & IV in the permanent exposure area and the working surface of the dam section of the firstphase longitudinal cofferdam are mainly attributed to the long interval foundation consolidation grout and afterwards cold wave attack, excessive high ratio of length to width in structure, foundation restraining stress and cold wave induced stress. By change of steel reinforcement arrangement, the cracks would not have any impact on the integrity of the structure.  一期导流工程纵向围堰坝身段在永久暴露面及施工仓面RCC上发现Ⅲ、Ⅳ类裂缝 ,其主要原因是基础固结灌浆造成长间歇 ,后迂寒潮袭击 ,加之结构长宽比大 ,在基础约束应力和寒潮应力的作用下造成裂缝 ,经布筋处理 ,对建筑物的整体性无大的影响  In order to examine the effect of the physical correlation of the wave and slamming induced stresses and the non regularity of the wave induced stress on the maximum combined stress, on the basis of the time lag property of occurrence of slamming with respect to the peaks of wave induced stress and the characteristic of high frequency oscillation of slamming induced stress, the combined hogging and sagging stress peak values are... In order to examine the effect of the physical correlation of the wave and slamming induced stresses and the non regularity of the wave induced stress on the maximum combined stress, on the basis of the time lag property of occurrence of slamming with respect to the peaks of wave induced stress and the characteristic of high frequency oscillation of slamming induced stress, the combined hogging and sagging stress peak values are determined respectively. The numerical analysis results show that the derived method of predicting the maximum combined stresses is highly computationally efficient and the characteristic values of the predicted maximum combined stress exhibit the rational variation with the damping ratio of the ship hull structure and the rate of occurrence of slamming.  为了反映砰击与波浪诱导应力的物理相关性以及波浪诱导应力的非规则性对组合极值的影响 ,依据砰击诱导应力相对于非规则波浪诱导中拱应力峰的时间延迟特性 ,以及砰击诱导应力的高频振荡特性 ,分别确定组合中拱和中垂峰值 .数值结果表明 ,所导出的方法具有较高的计算效率 ,且能合理地反映结构阻尼和砰击发生率对组合极值的影响   << 更多相关文摘 
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