Large permanent deformation have occurred in the plating of the longitudinal bulkheads in several 320,000-dwt tankers of the same class. The distortion has, in general, taken the form of yield lines between longitudinal stiffeners, with the lines running diagonally over a short distance at the ends of the plate panels near traverses. Early investigations suggested that the deformations might be due to vertical compression stresses and initial imperfections, but this explanation was not entirely convincing. The Authors examine this problem and propose the alternative explanation that the deformations were caused by the simultaneous action of dynamic pressure from full ballast tanks and high hull-girder shear forces; there is no plate instability and collapse is prevented by the inplane restraint of the remainder of the bulkhead. A method of estimating the deflection is described, together with its application in the analysis of the damaged ships and other ships without bulkhead deformations. Some recommendations are given for preventing the trouble in new designs, and it is mentioned that, to obtain further data, full-scale measurements have been carried out at sea and are being correlated with theoretical methods. Order from: BSRA as No. 48,745.

  • Supplemental Notes:
    • Paper presented at 1978 Meeting.
  • Corporate Authors:

    Association Technique Maritime et Aeronautique

    47 rue de Moneeau
    75008 Paris,   France 
  • Authors:
    • McCallum, J
    • Kametar, A G
  • Publication Date: 1978

Media Info

  • Features: References;
  • Pagination: 19 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00180068
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Sep 27 1978 12:00AM