基于随机腐蚀的船舶结构极限承载力研究

Ultimate Bearing Capacity of Ship Structure Based on Random Corrosion

提出了综合考虑海洋环境温度、海水氧气含量和相对湿度影响的钢质海船腐蚀数学模型,采用有限元方法分析了随机腐蚀对船舶加筋板结构局部承载力以及船体梁总纵极限承载力的影响,揭示了随机腐蚀后的船舶结构极限承载力分布规律。相较于标称海洋环境,海洋环境温度、相对湿度和海水含氧量对船舶结构腐蚀极限承载力有显著影响,且同一年限加筋板和船体梁的极限承载力服从正态分布。

This paper puts forward a mathematical model for corrosion of steel made sea-going ships that takes the effect of marine environment temperature, seawater oxygen content and relative humidity into account. The effect of random corrosion on the local bearing capacity of stiffened plate structure of the ship and the longitudinal ultimate bearing capacity of ship hull girder is analyzed by finite element analysis. The distribution of ultimate bearing capacity of ship structure after being subjected from random corrosion is summarized. Compared with the nominal marine environment, the temperature, relative humidity and seawater oxygen content in marine environment have a significant impact on the ultimate bearing capacity of the ship structure. However, the ultimate bearing capacity of the stiffened plates and hull girder obeys a normal distribution after service for the same period of years.