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Ultimate limit state design of ship stiffened panels and grillages

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Author Admin 작성일01-11-03 16:50 Hit63,352 Count Comments0 Count

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Presented at the 2001 SNAME annual meeting
October 24~27, Orlando, SNAME, Vol. 109


Ultimate limit state design of ship stiffened panels and grillages

Author(s): Jeom Kee Paik, Anil Kumar Thayamballi, Bong Ju Kim, Ge Wang, Yung Sup Shin and Donald Liu
Abstract:This paper is a logical sequel to the authors’2000 SNAME Annual Meeting paper (Paik et al.2000), and aims to deal with the advanced ultimate limit state design of stiffened panels and grillages that form parts of ship structures. In contrast, the previous paper dealt with the buckling and ultimate strength design of plate elements within such stiffened panels. In achieving a more advanced ultimate limit state design of stiffened panels and grillages, we are still confronted with a number of problem areas which have not been more completely solved. Related to such problem areas, this paper proposes a more advanced, yet design oriented ultimate limit state design methodology for ship stiffened panels and grillages. Possible failure modes involved in collapse of stiffened panels and grillages are first categorized. The ultimate strength of the stiffened panel under combined loads is calculated taking into account all of the possible failure modes and the interplay of various factors such as geometric and material properties, loading and post-weld initial imperfections. As is usual, the collapse of stiffened panels is considered to occur at the lowest value among the various ultimate loads calculated for each of the collapse patterns. The design oriented strength formulations developed accommodate all potential applied load components including biaxial compression / tension, biaxial in-plane bending, edge shear and lateral pressure loads. The fabrication related initial imperfections (initial deflections and residual stresses) are included in the developed strength formulations as parameters of influence. The validity of the proposed ultimate strength formulations is confirmed by a comparison with the nonlinear finite element solutions and mechanical collapse test results. Important insights developed from the present study are summarized. Recommendations are made with respect to needed future research.

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