In a double-hull structure, the neutral axis lies near the center of the cross-section, so that high tensile and compressive stress of about the same level occurs alternately on the skin plate. Once skin panels are buckled, the stiffness of the girders decreases consequently. If this stiffness reduction leads to the expansion of the region of panel buckling, the hull's global strength decreases seriously. On the other hand, such panel elastic buckling does not have a serious effect on the hull's global strength if the buckled region is limited to the small area due to the redistribution of the applied load. Thus the assessment of the safety and reliability of a double-hull structure requires the confirmation of the buckling strength of the skin plate and the behavior of the global structure after buckling. However, complicated nonlinear analyses have not yet been effectively applied in the actual design stage because the global hull model is too large for this kind of analysis. In order to accurately evaluate the post-buckling behavior of the whole double-hull structure in a practical time frame, the authors have developed the new assessment system, named SAIAS-PB, by the iteration of linear FEM analysis, introducing a simplified plate element with the equivalent stiffness of the buckled panel. In this paper, we report on the investigation or the stiffness of the panel after elastic buckling, the development of a new plate element for the equivalent stiffness of the buckled panel, and the application to the actual double-hull structure.
Practical evaluation system for post-buckling strength of ship double-hull structures
International Journal of Offshore and Polar Engineering ; 13 , 3 ; 209-215
2003
7 Seiten, 6 Quellen
Article (Journal)
English
Buckling and post buckling behavior of transversely stiffened ship hull model
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