Effect of welding initial imperfections on the ultimate strength of hull girder
[Objectives]The aim of this paper is to evaluate the longitudinal ultimate strength of a hull girder more accurately and determine its collapse process.[Methods]A bulk carrier is finely modeled in nonlinear finite element software ABAQUS,and the effects of slight,average,and severe welding initial de-formations and average welding residual stress on the ultimate strength of the hull girder under hogging and sagging bending moments are fully considered.[Results]The calculation results show that the hull girder's ultimate strength and bending stiffness decrease gradually with the increase of the initial deformation amp-litude.Severe welding initial deformation makes the ultimate strength of the bulk carrier decrease by 14.25%,and the bulk carrier's ultimate strength decreases by up to 8.22%under the effect of welding residual stress in-dividually.The combined effect of welding initial deformation and residual stress on the hull girder's ultimate strength is not a linear combination of the effects of the two initial deformations individually.[Conclusions]The combined effect of welding initial deformation and residual stress on a hull girder's ultimate strength should be considered more carefully in research on the ultimate strength of hull girders.
hull girdersstructural analysisultimate strengthwelding initial deformationwelding resid-ual stressfinite element methodABAQUS
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