Abstract
The welded stiffened plate is widely used in naval architecture and offshore engineering as a basic structural member. The aim of this study is to investigate the effect of welding residual stress and steel grade on the ultimate strength of stiffened plates under uniaxial compressive load by non-linear finite element analysis. Nineteen stiffened plates built with three types of stiffeners with various column slenderness ratios provided in the ISSC’2000 VI.2 benchmark calculations are employed in the present study. The commercial finite element code ABAQUS is applied to simulate the collapse behavior of the stiffened plates and verified against the benchmark calculations. Fabrication-related imperfections, such as initial deflections and residual stresses, are accounted for in the simulations. The ultimate strength of stiffened plates built in common shipbuilding steels, namely S235, S315, S355 and S390, are investigated by varying the yield strength of materials in the simulation. Analysis of the numerical results shows that the welding residual stress reduces the ultimate strength of stiffened plates, and increase in yield strength of the material can effectively improve the ultimate strength of common ship stiffened plates; and quantitative analyses of their influences have also been performed.
Highlights
Due to the self-weight, cargo weights, buoyancy forces, wave forces and other local loads, the ship hull girder is subject to alternating overall bending moment, and a hogging or sagging condition will result
The objective of the present study is to investigate the effects of welding residual stress and materials on the ultimate strength of stiffened plates fabricated in Steels S235, S315, S355 and S390, for they are the most commonly used steels in shipbuilding, no matter merchant or military vessels
Stiffened plates were employed that were built with three types of stiffener, commercial finite element code ABAQUS
Summary
Due to the self-weight, cargo weights, buoyancy forces, wave forces and other local loads, the ship hull girder is subject to alternating overall bending moment, and a hogging or sagging condition will result. Because of the overall bending of the hull girder, i.e., hogging or sagging, the structure members in the deck or the bottom will be subject to longitudinal compressive loads [1]. The stiffened plate is a basic structural member of ship hull structures which has a small addition of weight in the form of stiffeners, while generating a large increment in the strength of the structure [2]. The ultimate strength assessment of the stiffened plates has been investigated in many studies; experimentally, analytically and numerically
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