COMBINED SHIP HULL HORIZONTAL AND VERTICAL WAVE BENDING MOMENTS IN IRREGULAR SEAS

Rational design methods based on a statistical description of both the ship load and strength have been proposed by several authors in lieu of the traditional bending moment calculations. In general, the effect of horizontal moments on the primary strength has been neglected. It is shown in this paper, as several others have found, that the horizontal moments can be very significant. Two methods are described to obtain the magnitude of the equivalent combined moment. An example application is shown for a large tanker by use of the MIT seakeeping program. Wave moment trends with speed, sea state and wave heading are noted. Measured and predicted values of the vertical bending stress are compared. Finally, the parameters of the weibull distribution to describe long-term wave moment amplitudes are derived.

• Corporate Authors:

  Massachusetts Institute of Technology

  Department of Ocean Engineering, 77 Massachusetts Avenue
  Cambridge, MA  United States  02139
• Authors:
  • Baltazar, M A
• Publication Date: 1974-5

Subject/Index Terms

• TRT Terms: Bending moments; Hulls; Seakeeping; Ship motion; Strength of materials; Vehicle design
• Uncontrolled Terms: Ship design
• Old TRIS Terms: Hull bending moments; Hull strength
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00071698
• Record Type: Publication
• Source Agency: Massachusetts Institute of Technology
• Report/Paper Numbers: MS Degree
• Files: TRIS
• Created Date: Nov 12 1974 12:00AM