For all practical purposes the stiffness of a ship hull girder can be altered only before construction has become advanced and, after a ship is completed, only small changes can reasonably be made. These would be costly. Any excess of hull girder stiffness will bring with it considerable added weight and will require some sacrifice to the ship's economic viability. Any potential deficiency of stiffness has been of concern, especially since the advent of nonferrous building materials and the increased use of high-strength steels. A review of possible problems reveals no cause for alarm over insufficient stiffness for its own sake. More relevant interests should be the whipping bending stress components from slamming or fatigue from springing. Although reductions of hull stiffness reduce whipping bending moments, the bending stresses increase. A procedure is proposed for estimating whipping bending stresses during preliminary design, as a function of hull stiffness. It is based upon the "dynamic load factor" concept and should merit further development for use also in later design cycles.

  • Supplemental Notes:
    • Paper presented at SNAME Annual Meeting, November 16-18, 1978.
  • Corporate Authors:

    Society of Naval Architects and Marine Engineers

    601 Pavonia Avenue
    Jersey City, NJ  United States  07306-2907
  • Authors:
    • EVANS, J H
    • Kline, R G
  • Publication Date: 1978-9

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00184805
  • Record Type: Publication
  • Source Agency: Society of Naval Architects and Marine Engineers
  • Report/Paper Numbers: Paper No. 4
  • Files: TRIS
  • Created Date: Jan 13 1979 12:00AM