ABSTRACT

The consequence of the near realistic modelling of collision damage shape on the post-accidental ultimate hull girder strength of double-hull oil tanker is investigated. For known striking ship’s geometry of the bulbous bow, damaged elements are removed from the finite element model of the midship section of the struck ship. Progressive finite element collapse analysis is then performed to determine residual strength index (RSI) of damaged ship. The analysis is performed for set of 50 collision scenarios, obtained from the historical ship collision database. In addition, probabilistic analysis of RSI is performed by approximating damage shape as ‘rectangular box’, based on IMO and GOLADS project. Structural reliability analysis is then employed to assess the consequences of various modelling assumptions used in RSI computations. Results of the analysis show that near realistic modelling of damage shape results in much lower failure probability of damaged ship compared to the ‘rectangular box’ models.

摘要

研究了碰撞损伤形状的近似逼真的建模对双壳油轮事故后的最终船体梁强度的影响。对于球形船首的已知打击船几何形状，从打击船中段的有限元模型中删除了损坏的元素。然后进行渐进式有限元倒塌分析，以确定受损船舶的残余强度指标（RSI）。针对从历史船舶碰撞数据库获得的50个碰撞场景中的一组场景执行分析。此外，基于IMO和GOLADS项目，通过将损坏形状近似为“矩形框”来执行RSI的概率分析。然后，使用结构可靠性分析来评估RSI计算中使用的各种建模假设的后果。