International Journal of Naval Architecture and Ocean Engineering

The Society of Naval Architects of Korea (대한조선학회)
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A study on collision strength assessment of a jack-up rig with attendant vessel

  • Ma, Kuk Yeol (Department of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Kim, Jeong Hwan (The Korea Ship and Offshore Research Institute, Pusan National University) ;
  • Park, Joo Shin (Central Research Institute, Samsung Heavy Industries Co., Ltd.) ;
  • Lee, Jae Myung (Department of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Seo, Jung Kwan (The Korea Ship and Offshore Research Institute, Pusan National University)
  • Received : 2019.06.09
  • Accepted : 2019.10.06
  • Published : 2020.12.31
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Abstract

The rapid proliferation of oil/gas drilling and wind turbine installations with jack-up rig-formed structures increases structural safety requirements, due to the greater risks of operational collisions during use of these structures. Therefore, current industrial practices and regulations have tended to increase the required accidental collision design loads (impact energies) for jack-up rigs. However, the existing simplified design approach tends to be limited to the design and prediction of local members due to the difficulty in applying the increased uniform impact energy to a brace member without regard for the member's position. It is therefore necessary to define accidental load estimation in terms of a reasonable collision scenario and its application to the structural response analysis. We found by a collision probabilistic approach that the kinetic energy ranged from a minimum of 9 MJ to a maximum 1049 MJ. Only 6% of these values are less than the 35 MJ recommendation of DNV-GL (2013). This study assumed and applied a representative design load of 196.2 MN for an impact load of 20,000 tons. Based on this design load, the detailed design of a leg structure was numerically verified via an FE analysis comprising three categories: linear analysis, buckling analysis and progressive collapse analysis. Based on the numerical results from this analysis, it was possible to predict the collapse mode and position of each member in relation to the collision load. This study provided a collision strength assessment between attendant vessels and a jack-up rig based on probabilistic collision scenarios and nonlinear structural analysis. The numerical results of this study also afforded reasonable evaluation criteria and specific evaluation procedures.

Keywords

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (NRF2017R1A2B4004891).

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