中文摘要：

点腐蚀作为海水浸没带腐蚀的一种主要形式，是现役船舶，特别是老龄船结构的重大安全隐患．为了研究点腐蚀对钢板的抗压极限承载能力的影响，文中对未穿透低碳钢板开展了非线性有’限元分析．计算结果表明，单侧点腐蚀引起的偏心对钢板的极限抗压能力有显著影响．点腐蚀越密集（DOP越大），板越薄（β越大），点腐蚀深度改变造成板的极限承载能力差异越大，DOP达到或超过20％时尤其显著．大部分船体板属于典型的柔性板（β为3左右），海水全浸带腐蚀现象严重，点腐蚀密度大，仅采用点腐蚀密集度参数DOP来表征板点腐蚀破坏程度还有所欠缺，薄壁效应需要给予充分考虑．

英文摘要：

As one of main corrosion type of immersed ship hull, pitting corrosion could bring about heavy damage even accident to in-service ships, particularly old aged ships. To investigate effects of pits on ultimate compressive strength of mild steel plates, a series of non-linear FEM analysis on plates with non-through pits are undertaken in the paper. It is presented that eccentricity induced by one-side pits has considerable effects on ultimate compressive capacity of plates. The more intense the pits are（the larger DOP）, or / and the thinner-the plate is（the largerβ）, the difference of ultimate compressive capacity caused by change of pits depth is more serious, especially when DOP reaches or beyond 20%. Moreover, majority of ship applied plates belongs to typical slender plates（β≥3）,hence under severe immersed corrosion, it is not enough to occupy DOP exclusively to represent the extent of damage caused by pits, ＂thin-plate effect＂ should be given ample consideration.