Purpose
To assess the residual strength of ship and offshore structures after typical accidental incidents such as collision, grounding, explosions, falling objects etc. is vital for quantification of survival capacity. Strength assessments of damaged structures are also needed when repair actions are considered. Comprehensive strength analysis using simplified or more advanced analyses tools, such as non-linear FE programs, is provided. Simplified approaches can be justified under certain circumstances and can give value information about the residual strength while advanced non-linear analyses are required for higher accuracy and improved decision basis.

Benefits
DNV has long experience and in depth competence within the area of residual strength assessments of damaged structures. This competence and experience is linked to ultimate limit state design principles (ULS) of intact ship structures as the method and tools used are basically the same. Residual strength of structures needs to be assessed from a damage stability point of view also and the Emergency Response Service have long experience bringing ship stability and strength together. This in-house multi-discipline competence ensures professional assistance for residual strength assessments of practical cases.

Features
Features which are coped with are non-linear structural behaviour in general covering both geometrical and material effects. Simulating ex. collision damages, buckling of plates and stiffeners, cracks etc. and their effect on the residual ultimate strength is typical scope of work for a residual strength assessment.