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Structural Engineering and Mechanics Volume 57, Number 3, February10 2016 , pages 403-423 DOI: https://doi.org/10.12989/sem.2016.57.3.403 |
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Significance of seabed interaction on fatigue assessment of steel catenary risers in the touchdown zone |
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Hany Elosta, Shan Huang and Atilla Incecik
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| Abstract | ||
| The challenges involved with fatigue damage assessment of steel catenary riser (SCR) in the touchdown zone (TDZ) are primarily due to the non-linear behaviour of the SCR-seabed interaction, considerable uncertainty in SCR-seabed interaction modelling and geotechnical parameters. The issue of fatigue damage induced by the cyclic movements of the SCR with the seabed has acquired prominence with the touch down point (TDP) interaction in the TDZ. Therefore, the SCR-seabed response is critical for reliable estimation of fatigue life in the TDZ. Various design approaches pertaining to the lateral pipe-soil resistance model are discussed. These techniques have been applied in the finite element model that can be used to analyse the lateral SCR-seabed interaction under hydrodynamic loading. This study investigates the sensitivity of fatigue performance to geotechnical parameters through a parametric study. In this study, global analyses are performed to assess the influence of vertical linear seabed springs, the lateral seabed model and the non-linear seabed model, including trench evolution into seabed, seabed normalised stiffness, re-penetration offset parameter and soil suction resistance ratio, on the fatigue life of SCRs in the TDZ. | ||
| Key Words | ||
| steel catenary riser; touchdown zone; soil model; lateral seabed; soil stiffness; geotechnical parameters; deepwater; soft clay, non-linear seabed | ||
| Address | ||
| Hany Elosta: Flexible Systems Design, FORSYS SUBSEA An FMC Technologies and Technip Company, Asker, Norway Shan Huang and Atilla Incecik: Department of Naval Architecture and Marine Engineering, University of Strathclyde, Glasgow, UK | ||