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.
- Report of Committee II.1, August 23-26, 1976.
International Ship Structures Congress (Sixth)Boston, MA United States
- Publication Date: 1976
- Features: References;
- Pagination: 70 p.
- TRT Terms: Bulk carriers; Containerships; Finite element method; Liquefied gases; Liquefied natural gas; Offshore structures; Roll on roll off ships; Structural analysis; Structural mechanics; Submersibles; Tankers
- Uncontrolled Terms: Structural response
- Subject Areas: Bridges and other structures; Design; Marine Transportation;
- Accession Number: 00157148
- Record Type: Publication
- Source Agency: British Ship Research Association
- Files: TRIS
- Created Date: Aug 4 1977 12:00AM