Fast Evaluation of the Reliability of Container Securing Arrangements

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Abstract

In this paper closed form expressions for the transfer functions for the motions and accelerations are used to generate linear transfer functions for forces in lashed and unlashed containers located anywhere in a ship. Long term statistics for these forces are derived by application of a proper operational profile and a scatter diagram for the specific route, taking into account the effect of weather routing. Wind forces are added to the wave inertia and gravity loads to determine the limit state equations for evaluating the re-liability of a stack of containers against damage or loss. Several modes of container failures are considered including racking and corner post failure. The associated probability of failure is determined using a FORM approach. The procedure can easily be programmed in a simple spreadsheet and the calculation time is very short due to the use of analytical transfer functions for the inertia loads. It can therefore be used in the operational phase to evaluate the impact of container stacking sequence, lashing system, ship route and weather condition on the probability of failure of stacks of containers stowed in a ship.
Original languageEnglish
Title of host publicationProceedings of PRADS´04
PublisherSeehafen Verlag
Publication date2004
Pages577-585
Publication statusPublished - 2004
Event9th International Symposium on Practical Design of Ships and Other Floating Structures - Luebeck-Travemünde, Germany
Duration: 12 Sep 200417 Sep 2004
Conference number: 9

Conference

Conference9th International Symposium on Practical Design of Ships and Other Floating Structures
Number9
CountryGermany
CityLuebeck-Travemünde
Period12/09/200417/09/2004

Cite this

Mansour, A. E., Jensen, J. J., & Olsen, A. S. (2004). Fast Evaluation of the Reliability of Container Securing Arrangements. In Proceedings of PRADS´04 (pp. 577-585). Seehafen Verlag.