Finite element stress analysis of the midship transverse frame in an offshore production ship
- Norwegian Inst. of Tech., Trondheim (Norway)
Stress analysis of the midship transverse frame in an offshore production ship is performed. Four different models are applied for linear finite element stress analysis, namely, a conventional beam model as typically applied for tanker hull structures, a hybrid beam-membrane model with a superelement technique, a two-dimensional shell model considering half of the frame, and a most accurate three-dimensional shell model considering a quarter of the midship tank with two frames. Two critical load cases are applied, that is, full draught, cargo hold empty and ballast empty; and minimum draught, cargo hold full and ballast empty. Due to complex geometry of the transverse frame, the conventional beam model predicts maximum stress levels which are excessively large and beyond acceptance. The hybrid beam-membrane model results in improved stress predictions which become comparable with the results obtained by the shell models. The 3-D shell model is regarded as the most accurate, but the difference between the 2-D and 3-D models is small, and the 2-D model is numerically much more efficient.
- OSTI ID:
- 433651
- Report Number(s):
- CONF-940409--; ISBN 1-880653-10-9
- Country of Publication:
- United States
- Language:
- English
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