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

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3. Case <strong>Study</strong>• Step 1. Design Scope (1/3)‣ Subject vessel• Type : Double hull oil tanker (AFRAMAX class)• Dead weight : 105,000 Ton• Principle dimension : 234m (LBP) x 42m (B) x 21.2m (D)• Draught : 15m• Applied rule : IACS CSR-Oil Tanker, RCN No.1• Delivery : September 2008‣ Structural member concerned• A bottom longitudinal stiffener located at midship• A kind of LSM (local supporting member)‣ Failure mode concerned• Yield strength resisting local bending due to both lateral pressure andvertical wave bending momentThe 6 th ASEF- 15 -
3. Case <strong>Study</strong>• Step 1. Design Scope (2/3)Details of Structural MemberScantling (gross)Corrosion addition450x11+150x22 F.B(T)3.0 mmSection modulus (100% net) 1,762.9 cm 3MaterialHT32 (A-grade)Load calculation point (m) x=118.34/ y=8.3/ z=0Stiffener spacing830 mmEffective bending span <strong>4.</strong>030 mInner Bottom PlatingBottom PlatingBTM LongL. Stiff. No.10The 6 th ASEF- 16 -
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 14 and 15: 2. Safety Level of LSM• Calculati
Page 18 and 19: 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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