DNV GL ANALYSIS TECHNIQUES V-1-4 PDF

Application, Scope 

These Guidelines specify the procedure for global strength assessment of multipurpose vessels (MPV) by means of Finite Element (FE) analysis. Application of this advanced analysis method, amending the standard Rule scope, allows evaluating complex structures using a more refined approach, thus enabling further optimisation of structural designs and material utilisation. 

Multipurpose vessels are ships equipped with appropriate facilities to carry general cargo, heavy cargo, project cargo and containers. Frequently observed characteristics are: • large deck openings and small deck strakes

• long cargo holds

• heavy lift cranes, generally situated at the ship sides

• arrangement of a stability pontoon for heavy lift operations

• large uniform distributed loads on tank tops (block loads)

• large uniform distributed loads and container stack loads on weather deck covers

• close fitted weather deck covers with stoppers at one ship side and if needed, stoppers at the opposite side to limit transverse deformations

• transmission of high hatch cover stopper forces into the hatch coaming at port and starboard sides

• arrangement of tween deck covers at different vertical positions A.3 The structural analysis is to be carried out on the basis of permissible stresses in accordance with GL Rules for Hull Structures (I-1-1).

Section 1 of these Guidelines outlines basic principles governing the FE analysis. 

Section 2 provides detailed guidance for a global strength analysis of multipurpose vessels, using a finite element model of the entire vessel. A global FE analysis focuses on global stresses and deformations. 

Computer programs used for finite element analyses have to be generally acknowledged and accepted. All finite element programs that yield results to the satisfaction of Germanischer Lloyd are considered recognised. 

Required fatigue strength assessment is to be based on GL Guidelines for Fatigue Strength Analyses of Ship Structures (V-1-2).