4. Study on the Risk-Based Methodology for Ship Structural Design

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2. Safety Level of LSM• Calculation of Design Safety LevelTo calculate Failure Probability (P f ), when the vessel experiences a wavehaving a specific direction (headingangle) in a given loading condition.To combine the Probabilities calculated, in case one wave approaches the vessel, considering all the possible loadingconditions and wave directions.To estimate Design Safety Level, that means the probability ofno structural failure occurrencethroughout the vessel’s lifetime.Pf LC, angle Z(LC,angle)Z 0Pf LC ranglePfLC,angleanglePfonewave rLCPfPSafeDesignLCLC P(n 0, T) ePf onewaveLC – a given loading conditionangle – a given wave direction (heading angle)r angle – ratio of each wave direction to 360 Or LC – ratio of each loading condition to lifetimeT – vessel’s lifetime (design life)n – number of occurrence of specific failure eventHomogeneous Poisson Processn( T)TP( n,T) e for n 0, 1, 2, n!TThe 6 th ASEF- 13 -
3.Case <strong>Study</strong>The 6 th ASEF- 14 -
Page 2 and 3: Contents1. Safety Level Based Hull
Page 4 and 5: 1. Safety Level Based Assessment•
Page 10 and 11: 2.Safety Level of LSM(Local Support
Page 12 and 13: 2. Safety Level of LSM• Considera
Page 16 and 17: 3. Case Study• S
Page 28 and 29: 4. Conclusion• I
Page 30: The 6 th ASEF- 29 -

4. Study on the Risk-Based Methodology for Ship Structural Design

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