Numerical investigation on dynamic ultimate strength of stiffened panels considering real loading scenarios

ABSTRACT

In the last 10 years, the importance of whipping on the extreme hull girder loads has received much attention from designers and classification societies. The most common practice to evaluate the ultimate strength of a relatively soft floating structure is to compare the maximum dynamic vertical bending moment after a slamming event with the quasi-static hull girder capacity. Some aspects regarding the current procedure remain unclear, like the capability of the current hydro-elastic methods to accurately predict the extreme dynamic response on the basis of a linear elastic structural model. Moreover, the whipping-induced stresses have a higher frequency than the ordinary wave-induced stresses; hence, the dynamic effects may provide additional strength reserves for the structure and should be investigated. Therefore, the aim of this paper is to investigate the dynamic ultimate strength of stiffened panels considering real loading scenarios, associated with wave loads and whipping response.

KEYWORDS:

• Dynamic capacity
• ultimate strength
• strain rate sensitivity
• stiffened panels
• whipping
• ultra large container ship

Acknowledgments

The present research work was undertaken at Ecole Centrale de Nantes, France, as a part of the Ph.D. thesis on the analysis of whipping effects over the hull girder's ultimate strength.

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

George Jagite http://orcid.org/0000-0001-6479-2498

Additional information

Funding

The first author is pleased to acknowledge the funding and support of Bureau Veritas via BV-ECN cooperation.