ABSTRACT

Fire poses a significant threat in the shipping industry not only for humans (passenger, seafarers) but also for the ship structure. It is of great concern how elevated temperatures from a fire can influence the bending moment capacity of a hull girder due to the degradation of steel’s mechanical properties. The aim of the paper is to evaluate the ultimate bending moment capacity of a chemical oil/product carrier at ambient and elevated temperature conditions. The study defines the parameters and modelling that need to be considered in the finite element analysis (FEA) and proposes a modified incremental–iterative procedure for the bending moment capacity calculation at elevated temperatures. Smith Method was extended in order to incorporate neutral axis rotation and steel’s mechanical properties at elevated temperatures. The proposed modified Smith Method’s results present good agreement with the equivalent FEA results. It is concluded that with the proposed modified Smith Method, it is possible to determine the loading that can be carried by a hull girder with a specified temperature profile. The study also determines an analysis technique for the stiffened panel ultimate strength analysis at elevated temperatures.

摘要

火灾不仅对人类（乘客、海员）而且对船舶结构构成了航运业的重大威胁。由于钢的机械性能下降，火灾引起的高温如何影响船体梁的弯矩能力是非常令人担忧的。该论文的目的是评估化学油/产品载体在环境和高温条件下的极限弯矩能力。该研究定义了在有限元分析 (FEA) 中需要考虑的参数和建模，并提出了一种改进的增量迭代程序，用于在高温下计算弯矩能力。史密斯方法被扩展以将中性轴旋转和钢在高温下的机械性能结合起来。提议的修正史密斯方法的结果与等效的 FEA 结果非常吻合。得出的结论是，使用所提出的修正史密斯方法，可以确定具有指定温度分布的船体梁可以承受的载荷。该研究还确定了一种在高温下进行加筋板极限强度分析的分析技术。