Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Residual Longitudinal Strengths of Asymmetrically Damaged Ships

비대칭 손상 선박의 잔류 종강도 평가

  • Choung, Joon-Mo (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Lee, Min-Seong (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Jeon, Sang-Ik (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Nam, Ji-Myung (Department of Naval Architecture and Ocean Engineering, Inha University) ;
  • Ha, Tae-Bum (Research and Development Center, Korean Register of Shipping)
  • 정준모 (인하대학교 조선해양공학과) ;
  • 이민성 (인하대학교 조선해양공학과) ;
  • 전상익 (인하대학교 조선해양공학과) ;
  • 남지명 (인하대학교 조선해양공학과) ;
  • 하태범 (한국선급 기술연구소)
  • Received : 2010.11.16
  • Accepted : 2011.04.05
  • Published : 2011.06.20
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Abstract

This paper presents estimation of deterministic damage extents and locations due to collision and grounding which are defined by ABS guideline and DNV ship rules. It is noted that the overall extents of damages from DNV are larger than those from ABS. Nonlinear FEAs are carried out to predict residual longitudinal strength of hull girder with asymmetric severe damages. The accuracy of the applied FEA procedure is proved by comparing FEA result with test result of a 1/3-scaled frigate. The investigated vessels are a VLCC and a large-sized bulker for which evenly distributed heeling angles from $0^{\circ}$(sagging) to $180^{\circ}$(hogging) by $30^{\circ}$ due to damage-induced flooding are taken into account. The reduction ratios of the ultimate residual strength for the damaged cases to those for the intact sagging case are shown. It is proved that the grounding damage case under DNV assumption reveals most critical the residual strength. The design formulas are presented to assure minimum residual ultimate moment after damage.

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References

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