Smith’s method has been widely used for the progressive collapse analysis of a ship’s hull girder under longitudinal bending. In the Smith’s method, a hull girder’s cross section is divided into the plate and stiffened-panel elements which are given a priori an average stress-average strain relationship under uniaxial tension/compression considering buckling and yielding. This implies that pure axial load is applied to each element while no curvature effect over the element span due to hull girder bending is considered. In addition, it is assumed that the cross section remains in a plane during hull girder bending and that all elements deform independently with no interaction between adjacent elements. The objective of this study attempts to investigate the influences of these assumptions that are used in the Smith's method. Progressive collapse behavior of a 14,000TEU container ship is analyzed by the Smith’s method using the average stress-average strain relationships of the plate and stiffened-panel elements estimated by the nonlinear finite element method (NFEM). On the other hand, the progressive collapse behavior of the hull girder is directly analyzed by NFEM using 3D-shell model. Comparing both results, the model uncertainty of the Smith’s method due to its basic assumptions is discussed. It is found that global hull-girder curvature, usually neglected in the Smith’s method, significantly affects collapse behavior of the stiffened panels.
A Study on Progressive Collapse Analysis of a Hull Girder Using Smith’s Method – Uncertainty in the Ultimate Strength Prediction
Lecture Notes in Civil Engineering
Practical Design of Ships and Other Floating Structures ; 2019 ; Yokohama, Japan September 22, 2019 - September 26, 2019
2020-10-04
17 pages
Article/Chapter (Book)
Electronic Resource
English
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