ON THE TORSIONAL STRENGTH OF A SHIP WITH WIDE AND LONG HATCH OPENINGS

The major problem in designing a ship with wide and long hatch openings, such as a container ship, is to clarify her torsional behaviour. Many investigations have been done in regard to this problem, but have generally restricted themselves within rather a simple hull structure. It is, therefore, difficult to clarify the torsional behaviour of above mentioned ship by applying the results of investigations previously published. In this paper, the authors try to establish the method of theoretical calculation for the torsional behaviour of the ship holding her structural characteristics and then to verify the reliability of the method of calcula- tion by the torsion test on models. The results of the torsion test are analyzed according to the above mentioned method and yield the following conclusions. (1) The torsional behaviour of such a ship can be well characterized and estimated by the method of theoretical calculation developed here. (2) The distortion components of hatch openings due to warping of the cross section cannot be neglected compared to the ones due to change of the transverse displacement at the deck level. (3) The corner stress due to distortion of hatch openings reaches its maximum at the end of the cross deck where the opening is changing from wider to narrower.

• Corporate Authors:

  Ship Research Institute, Tokyo

  38-1, 6-chome, Shinkawa, Mitaka-shi
  Tokyo,   Japan 
• Authors:
  • Mori, M
  • Sakuragi, H
  • UMEZAKI, K
  • Hagiwara, K
  • NAKAGAWA, M
• Publication Date: 0

Media Info

• Features: Figures; References; Tables;
• Pagination: 18 p.

Subject/Index Terms

• TRT Terms: Distortion (Structures); Hatch covers
• Old TRIS Terms: Hatch distortion
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00007444
• Record Type: Publication
• Files: TRIS
• Created Date: Dec 22 1971 12:00AM