engleski

Restoring stiffness in the hydroelastic analysis of marine structures

The restoring stiffness, that couples displacements and deformations, plays very important role in hydroelastic analysis of marine structures. The problem of its formulation is quite complex and is still discussed in the relevant literature. In the paper, the recent formulations of restoring stiffness are correlated and analyzed. Due to some equivalent terms of the restoring and geometric stiffness as a result of common load, the unifi ed stiffness is established and compared with the complete restoring stiffness known in the relevant literature. It is found out that the new formula deals with more terms, and, that under some assumptions, it is reduced to the known complete restoring stiffness. The unified stiffness constitution is analyzed through derived analytical formulae for prismatic pontoon. Its consistency is checked for the rigid body displacements. Also, numerical results of the hydroelastic response of segmented barge are correlated with available model test results. Some issues, that are important for practical implementation in the hydroelastic code for flexible structures, are described.

Geometric stiffness ; Hydroelasticity ; Restoring stiffness ; Segmented barge

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