Assessing the impact of riser-soil interaction model on the fatigue life of large diameter SCRs

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Abstract

This paper investigates the effect of riser-soil interaction model selection on the assessment of steel catenary riser (SCR) fatigue life for realistic environmental conditions at a deep-water Australian North west shelf (NWS) site. Using a fatigue wave scatter diagram consisting of 100 metocean conditions at the site (combining irregular seas, swell and current), a dynamic timedomain finite element analysis is coupled with the rain-flow cycle counting algorithm in order to determine the fatigue life of SCRs due to first-order motions of the host floater. Rigid, linear elastic and nonlinear riser-soil interaction models are used in order to assess the impact of model selection on the fatigue life of example deep-water SCRs of varying diameter. It is shown that the use of a nonlinear riser-soil interaction model for a representative deep-water NWS site can give an almost two-fold increase in SCR fatigue life over a stiff linear seabed assumption, albeit at a significant computational expense. It is further shown that a recently developed method for calculating equivalent linear soil stiffness may be used in place of the computationally expensive nonlinear approach in order to estimate SCR fatigue life to a reasonable level of accuracy. A methodology for applying the equivalent linear stiffness method to irregular sea-states is proposed and general insight into the selection of the most appropriate soil-riser interaction model for the fatigue analysis of large diameter deep-water SCRs is provided.

Original languageEnglish
Title of host publicationProceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering
Subtitle of host publicationOMAE2018
Place of PublicationUSA
PublisherThe American Society of Mechanical Engineers (ASME)
Volume5
ISBN (Electronic)9780791851241
DOIs
Publication statusPublished - 1 Jan 2018
EventASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2018 - Madrid Marriott Auditorium Hotel & Conference Centre, Madrid, Spain
Duration: 17 Jun 201822 Jun 2018
https://www.asme.org/events/omae

Conference

ConferenceASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2018
Abbreviated titleOMAE 2018
CountrySpain
CityMadrid
Period17/06/1822/06/18
Internet address

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