LOAD CRITERIA FOR SHIP STRUCTURAL DESIGN

Consideration is given to the critical loads on ships' hulls, as indicated by possible modes of structural damage and/or failure. An ultimate load criterion is then set up involving the following bending moments: quasi-static wave-induced, vertical and lateral combined, still water, including effect of ship's own wave, dynamic loads, including slamming, whipping, and springing, and thermal effects. The determination of each of these loads is discussed in detail, and the need for further clarification of dynamic loads is brought out. Methods of combining these loads, all expressed in probability terms, are considered. A criterion for cyclic loading is discussed, involving the prediction of the expected number of combined loads of different levels, as well as the expected shifts of mean value. A criterion for brittle fracture is also discussed. Attention is given to estimating an acceptable probability of failure for use in design. Finally, calculations of loads are carried out for a typical cargo ship, the S.S. Wolverine State. The loads are then combined in accordance with the proposed ultimate load criterion and compared with the standards under which the ship was designed. (Author)

• Corporate Authors:

  Webb Institute of Naval Architecture

  Glen Cove, NY  United States 
• Authors:
  • Lewis, E V
  • Hoffman, D
  • Maclean, W M
  • Van Hooff, R
  • Zubaly, R B
• Publication Date: 1973-5

Media Info

• Pagination: 118 p.

Subject/Index Terms

• TRT Terms: Bending; Bending moments; Cargo ships; Costs; Design; Dynamic loads; Failure; Fracture mechanics; Hulls; Loads; Ocean waves; Slamming; Structural design; Thermal stresses
• Identifier Terms: Ship Structure Committee
• Uncontrolled Terms: Design criteria; Ship hulls
• Old TRIS Terms: Hull bending moments; Hull springing; Loading mechanics
• Subject Areas: Design; Finance; Marine Transportation; Materials;

Filing Info

• Accession Number: 00051224
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: SSC-240 Tech Rpt.
• Contract Numbers: N00024-71-C-5372
• Files: TRIS
• Created Date: Mar 25 1974 12:00AM