Load Criteria for Ship Structural Design
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1973
- Accession Number
- AD0767389
Entities
People
- Dan Hoffman
- Edward V. Lewis
- Richard Van Hooff
- Robert B. Zubaly
- Walter M. Maclean
Organizations
- Webb Institute