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Research Papers

Structural Reliability of a Suezmax Oil Tanker Designed According to New Common Structural Rules

[+] Author and Article Information
C. Guedes Soares

Unit of Marine Technology and Engineering, Instituto Superior Tecnico, Technical University of Lisbon, 1049-001 Lisboa, Portugalguedess@mar.ist.utl.pt

Joško Parunov

 University of Zagreb, Faculty of Mechanical Engineering, and Naval Architecture, Department of Naval Architecture and Ocean Engineering, Ivana Lučića 5, 10000 Zagreb, Croatiajparunov@fsb.hr

J. Offshore Mech. Arct. Eng 130(2), 021003 (Feb 28, 2008) (10 pages) doi:10.1115/1.2779333 History: Received October 02, 2006; Revised June 12, 2007; Published February 28, 2008

The paper aims at quantifying the changes in notional reliability levels that result from redesigning an existing suezmax tanker to comply with new Common Structural Rules (CSR) requirement for ultimate vertical bending moment capacity. The probability of structural failure is calculated using a first-order reliability method. The evaluation of the wave-induced load effects that occur during long-term operation of the ship in the seaway is carried out in accordance to International Association of Classification Societies (IACS) recommended procedure. Comparative analysis of long-term distributions of vertical wave bending moment calculated by two independent computer seakeeping codes is performed. The still-water loads are defined on the basis of a statistical analysis of loading conditions from the loading manual. The ultimate collapse bending moment of the midship cross section, which is used as the basis for the reliability formulation, is evaluated by CSR single-step procedure and by program HULLCOLL for progressive collapse analysis of ship hull-girders. The reliability assessment is performed for as-built and corroded states of the existing ship and a reinforced design configuration complying with CSR. It is shown that hull-girder failure probability of suezmax tanker reinforced according to new CSR is reduced several times. Sensitivity analysis and a parametric study are performed to investigate the variability of results to the change of parameters of pertinent random variables within their plausible ranges.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Curves of bending moment-hull curvatures in sagging calculated by HULLCOLL

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Figure 2

Curves of bending moment-hull curvatures in hogging calculated by HULLCOLL

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Figure 3

Comparison of transfer functions of VWBM by two linear strip theory codes (transfer functions are made nondimensional by dividing them by ρgBL2)

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Figure 4

Comparison of long-term distribution of VWBM for FL condition and two different computer codes

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Figure 5

Ranges of reliability indices calculated by parametric variation

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