LINEAR STRUCTURAL RESPONSE

This report concludes that the finite-element method still remains the principal tool for linear elastic analysis. When varied types of design are employed, as in LNG carriers and offshore structures, elaborate FEM calculations are quite common. In designs with less variation, or in those where structural interactions were clarified by previous calculations and experiments, simplified calculations tend to be employed. For supertankers, 2- or 3-dimensional frame analysis followed by FEM analysis is generally employed. In the case of container ships, structural thinking is widely used, particularly the use of strip elements as superelements combined with transfer matrices instead of stiffness matrices. This constitutes an important change, since the major analysis systems using FEM methods are not suitable for use with transfer matrices. Work in Germany is reported, dealing with improvement of methods for calculation of torsion stresses in container ships with particular consideration of discontinuities caused by lateral bracing as well as secondary shear deformations and warping torsion deformation. Other work in Germany includes computer optimization of the double bottoms of bulk carriers and the use of FEM for the statistical stress and deformation analysis of sea wave loaded structures. The need for further work on container ships is emphasized, particularly the need for a method to determine experimentally or theoretically the position of the torsional centre in a given section of a container ship.

  • Supplemental Notes:
    • Report of Committee II.1, August 23-26, 1976.
  • Corporate Authors:

    International Ship Structures Congress (Sixth)

    Boston, MA  USA 
  • Publication Date: 1976

Media Info

  • Features: References;
  • Pagination: 70 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00157148
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Aug 4 1977 12:00AM