Structural Engineering and Mechanics

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Fatigue performance of deepwater steel catenary riser considering nonlinear soil

  • Kim, Y.T. (Environmental and Plant Engineering Research Team, Daewoo Institute of Construction Technology) ;
  • Kim, D.K. (Ocean and Ship Technology, Deepwater Technology Mission Oriented Research, Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS) ;
  • Choi, H.S. (Graduate School of Engineering Mastership, Pohang University of Science and Technology) ;
  • Yu, S.Y. (Ocean and Ship Technology, Deepwater Technology Mission Oriented Research, Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS) ;
  • Park, K.S. (Steel Structure Research Group, POSCO Global R&D Center)
  • Received : 2016.06.13
  • Accepted : 2016.11.15
  • Published : 2017.03.25
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Abstract

The touch down zone (TDZ) and top connection point of the vessel are most critical part of fatigue damage in the steel catenary riser (SCR). In general, the linear soil model has been used to evaluate fatigue performance of SCRs because it gives conservative results in the TDZ. However, the conservative linear soil model shows the limitation to accommodate real behavior in the TDZ as water depth is increased. Therefore, the riser behavior on soft clay seabed is investigated using a nonlinear soil model through time domain approach in this study. The numerical analysis considering various important parameters of the nonlinear soil model such as shear strength at mudline, shear strength gradient and suction resistance force is conducted to check the adoptability and applicability of nonlinear soil model for SCR design.

Keywords

Acknowledgement

Supported by : Ministry of Trade, Industry & Energy (MI)

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