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Research Papers: Structures and Safety Reliability

Long-Term Extreme Response Analysis of Marine Structures Using Inverse SORM

[+] Author and Article Information
Finn-Idar G. Giske

NTNU/Multiconsult, 7491/Oslo,
Trondheim 0213, Norway
e-mail: figg@multiconsult.no

Bernt Johan Leira

Department of Marine Technology NTNU,
Trondheim 7491, Norway
e-mail: bernt.leira@ntnu.no

Ole Øiseth

Department of Structural Engineering NTNU,
Trondheim 7491, Norway
e-mail: ole.oiseth@ntnu.no

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received August 17, 2017; final manuscript received March 9, 2018; published online May 2, 2018. Assoc. Editor: Kazuhiro Iijima.

J. Offshore Mech. Arct. Eng 140(5), 051601 (May 02, 2018) (7 pages) Paper No: OMAE-17-1146; doi: 10.1115/1.4039718 History: Received August 17, 2017; Revised March 09, 2018

In this paper, the first-order reliability method (FORM) found in connection with structural reliability analysis is first used in an inverse manner to efficiently obtain an approximate solution of the full long-term extreme response of marine structures. A new method is then proposed where the second-order reliability method (SORM) is used to improve the accuracy of the approximation, resulting in an inverse SORM (ISORM) approach. This method is compared with exact results obtained using full numerical integration. The new method is seen to achieve significantly improved accuracy, yet keep the number of required short-term response analyses within acceptable levels.

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References

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Figures

Grahic Jump Location
Fig. 1

The joint PDF of the environmental parameters

Grahic Jump Location
Fig. 2

The generalized Pierson–Moskowitz spectrum

Grahic Jump Location
Fig. 3

The absolute value |HηR(ω)| of the transfer function

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