Abstract
Abstract Stiffened plates are the main structural building block in ship and offshore hulls and their structural response subject to loads is a topic of significant practical interest in ship and offshore structural design. To investigate the structural capacity for design and evaluation purposes, it is becoming an efficient and reliable practice to carry out non-linear finite element (FE) analysis. The present study is to assess the buckling strength of a stiffened deck panel on an FPSO vessel using the nonlinear finite element code ADVANCE ABAQUS, where imperfection sensitivity work is also accounted for. The cases studied correspond to in-plane bi-axial compression in the two orthogonal directions. The findings are compared with the DNVGL PULS (Panel Ultimate Limit State) buckling code for the stiffened panels. It is found that the strength values from the ADVANCE ABAQUS and DNVGL PULS code are very close. The results and insights developed from the present work are discussed in detail.
Highlights
A typical ship and an offshore structure can be considered as an assemblage of continuous stiffened plates with spaced longitudinal stiffeners of approximately the same size
The Panel Ultimate Limit State (PULS) code computerised buckling code is employed to compare the capacity estimates obtained from nonlinear finite element analysis by ABAQUS
The imperfection tolerances given in DNVGL CN30.1 have been used as the basis for the analyses, but several other combinations with both larger and smaller tolerances have been analysed
Summary
A typical ship and an offshore structure can be considered as an assemblage of continuous stiffened plates with spaced longitudinal stiffeners of approximately the same size. The ALPS/ULSAP method was used to determine the ultimate limit state of a stiffened panel under uniaxial or biaxial compression and lateral pressures, and the results were compared to the ANSYS nonlinear finite element analysis. Based on the numerical results, the empirical expressions were derived for the ultimate strength assessment of stiffened panels under combined in-plane axial compression and different levels of lateral pressure.
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