Residual Longitudinal Strength of a VLCC Considering Probabilistic Damage Extents

摘要

This paper provides prediction of ultimate longitudinal strengths ofhull girder of a VLCC considering probabilistic damage extents due tocollision and grounding accidents based on IMO Guideline(2003). Theprobability density functions of damage extents are expressed as afunction of non-dimensional damage variables. The accumulatedprobability levels of 10%, 30%, 50%, and 70% are taken into accountfor the damage extent estimation. The ultimate strengths have beencalculated using in-house software UMADS (Ultimate MomentAnalysis of Damaged Ships) which is based on the progressive collapsemethod. Damage indices are provided for all heeling angles due to anypossible flooding of compartments from 0° to 180° which representfrom sagging to hogging conditions, respectively. The analysis resultsreveal that minimum damage indices show different values accordingto heeling angles and damage levels.