Contribution of Transverse Bulkheads to Hull Stiffness of Large Container Ships

摘要

Vrlo veliki kontejnerski brodovi prilično su elastični i stoga podložni velikim valnim deformacijama. Zato se danas njihova čvrstoća istražuje metodama hidroelastičnosti. Pritom se radi jednostavnosti sprežu gredni strukturni model i 3D hidrodinamički model. U ovom članku istražen je doprinos velikoga broja poprečnih pregrada kontejnerskih brodova općoj krutosti trupa. Za te potrebe razmatran je prizmatični ponton s poprečnim presjekom velikoga kontejnerskog broda. Konstruiran je 3D model konačnih elemenata i provedena je analiza uvijanja s uključenim i isključenim poprečnim pregradama. Korelacijskom analizom deformacija za ova dva slučaja ustanovljen je utjecaj poprečnih pregrada na krutost brodskoga trupa. Pritom se koristila teorija uvijanja tankostjenih nosača.%Ultra large container ships are rather flexible and exposed to significant wave deformations. Therefore, the hydroelastic strength analysis is required for these types of ships. The coupling of a beam structural model and a 3D hydrodynamic model is preferable for reasons of simplicity. In this paper, the contribution of large number of transverse bulkheads to general hull stiffness is analysed. The prismatic pontoon with the cross-section of a large container vessel is considered for this purpose. The 3D FEM torsional analysis is performed with transverse bulkheads included and excluded. The correlation analysis of the obtained deformations indicated the influence of transverse bulkheads on the ship hull stiffness. The analysis is done by employing the torsional theory of thin-walled girders.