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

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

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2. Safety Level of LSM• Formulati<strong>on</strong> of Limit State Equati<strong>on</strong>Z R L WorkingLMTWorking2sP P M C M WKStatWKDynfbendzWKStatWKDynHGvert• Failure mode c<strong>on</strong>cerned Yielding failure of local stiffener, due to local bending• Load type c<strong>on</strong>cerned Local loads: lateral pressure from external sea and internal ballast/cargo Global loads: vertical wave bending moment• Resistance factor (R) = yield stress capacity of <strong>the</strong> material used• Load factor (L) = working stress <strong>on</strong> <strong>the</strong> stiffener c<strong>on</strong>sidered• Background Beam <strong>the</strong>ory (both ends fixed) Scantling <strong>for</strong>mulas in IACS CSR <strong>for</strong> double hull oil tanker Net scantling approachstiffScale0.001dIvertThe 6 th ASEF- 10 -

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