Professional paper

The ultimate strength of the ship hull

Kalman Žiha
Joško Parunov
Berislav Tušek

Abstract

This review paper fi rst reveals for Croatian readers the basic issue and the history of ultimate strength and conclusions according to the International Ship Structure Committee. The following briefly recapitulates the practical method for ultimate strength analysis according to common rules of classifi cation societies and presents a computer program, ULTIS, implemented at the Faculty of Mechanical Engineering and Naval architecture in Zagreb, based on IACS recommendations. Subsequently, benchmark studies of ultimate strength of a bulk carrier built in a Croatian shipyard employing ULTIS are attached to illustrate the stepwise yielding and buckling scenario of hull elements both for deck and bottom structures in sagging and hogging conditions, as well as the effect of higher tensile steel during the ship bending. Finally, the paper investigates a possible increase of the ship’s hull ultimate strength by strengthening longitudinal structural elements after their failure sequence under bending.

Keywords

bulk carriers; classifi cation societies rules; hull strength; oil tankers; ship construction; ultimate strength

Hrčak ID:

11582

URI

https://hrcak.srce.hr/11582

Publication date:

31.3.2007.

Article data in other languages: croatian

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