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

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

NTNU / Multiconsult, Trondheim, 7491 / Oslo, 0213, Norway

Bernt J. Leira

Department of Marine Technology, NTNU, Trondheim, 7491, Norway

Ole Øiseth

Department of Structural Engineering, NTNU, Trondheim, 7491, Norway

1Corresponding author.

ASME 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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