This paper investigates the characteristics of bending moments, shear forces and stresses at unit connections of VLFS (very large floating structures) under wave loads. The responses of VLFS are calculated by solving multi-body motion equation considering hydroelasticity and connection stiffness. Hydroelastic responses are calculated by the direct method. HOBEM(Higher-order boundary element method) is used for fluid analysis and FEM (finite element method) is introduced for structural analysis. The equation of motion is modified to describe the unit connections by employing spring elements. Bending moments and shear forces at the connections are obtained from the dynamic equilibrium condition for pressures and inertia forces. Two types of VLFS units such as tandem arranged units and side-by-side arranged units are considered in the numerical examples. The influences of connection stiffness, wave frequency and heading angle on responses of VLFS are investigated through the numerical examples. Rigid body analysis along with hydroelastic analysis is also carried out in the numerical analysis and comparison of those two approaches is discussed.
Evaluation of bending moments and shear forces at unit connections of very large floating structures using hydroelastic and rigid body analyses
Bestimmung von Biegemomenten und Scherkräften an Verbindungen von sehr großen Einheiten schwimmender Strukturen unter Verwendung hydroelastischer Analysen und von Analysen steifer Körper
Ocean Engineering ; 34 , 11-12 ; 1668-1679
2007
12 Seiten, 17 Quellen
Aufsatz (Zeitschrift)
Englisch
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