EXAMINATION OF SERVICE AND STRESS DATA OF THREE SHIPS DEVELOPMENT OF HULL GIRDER LOAD CRITERIA

This is a follow-on project to SSC-240, "Load Criteria for Ship Structural Design", which proposed methods for the estimation and superposition of the primary loads and performed sample calculations for one conventional dry cargo ship. It involved the following bending moments: Still-water due to weight and buoyancy; Ship's own wave train; Quasi-static wave-induced, vertical and lateral combined; Dynamic loads, including slamming, whipping and springing; Thermal effects. Here the service and full-scale stress data of three larger and/or faster ships (Containership SL-7, Bulk Carrier FOTINI-L and very large Crude Carrier UNIVERSE IRELAND) are examined for the purpose of the eventual development of hull-girder criteria. The examination is limited to extreme midship bending moment loads which are related to the ultimate strength. An assessment is made of the compatibility between the service and stress data of the distinctly different study ships and the analysis methods of SSC-240 and their assumptions for cargo ship type. Considerable insight is obtained into the probable correct mathematical approximations of the loads and their interrelationships. It appears that still-water bending moments can be approached probabilistically, however, considerable additional information on experienced loading conditions must be gathered to determine the statistical distributions. Additional effort is required to determine the suitable probabilistic expression and a synthesis method for the contribution of vibration to the extreme load.

  • Corporate Authors:

    Rosenblatt (M) and Son, Incorporated

    350 Broadway
    New York, NY  USA  10013

    Naval Ship Engineering Center

    Department of the Navy
    Washington, DC  USA  20362

    Ship Structure Committee

    National Academy of Science, 2101 Constitution Avenue, NW
    Washington, DC  USA  20418
  • Authors:
    • Dalzell, J F
    • Maniar, N M
    • Hsu, M W
  • Publication Date: 1979-4

Media Info

  • Features: References;
  • Pagination: 180 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00197071
  • Record Type: Publication
  • Source Agency: Ship Structure Committee
  • Report/Paper Numbers: SSC-287 Final Rpt.
  • Contract Numbers: N00024-75-C-4324
  • Files: TRIS
  • Created Date: Aug 28 1979 12:00AM