Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Proposal of Rotating Stability Assessment Formula for an Interlocking Caisson Breakwater Subjected to Wave Forces

파랑하중에 대한 인터로킹 케이슨 방파제의 회전 안정성 평가식 제안

  • Park, Woo-Sun (Coastal Development and Ocean Energy Research Center, Korea Institute of Ocean Science and Technology) ;
  • Won, Deokhee (Maritime ICT R&D Center, Korea Institute of Ocean Science and Technology) ;
  • Seo, Jihye (Maritime ICT R&D Center, Korea Institute of Ocean Science and Technology) ;
  • Lee, Byeong Wook (Coastal Development and Ocean Energy Research Center, Korea Institute of Ocean Science and Technology)
  • 박우선 (한국해양과학기술원 연안개발.에너지연구센터) ;
  • 원덕희 (한국해양과학기술원 해양ICT융합센터) ;
  • 서지혜 (한국해양과학기술원 해양ICT융합센터) ;
  • 이병욱 (한국해양과학기술원 연안개발.에너지연구센터)
  • Received : 2019.11.28
  • Accepted : 2020.01.29
  • Published : 2020.02.28
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Abstract

The rotational stability of an interlocking caisson breakwater was studied. Using the analytical solution for the linear wave incident to the infinite breakwater, the phase difference effect of wave pressures in the direction of the breakwater baseline is considered, and Goda's wave pressure formula in the design code is adopted to consider the nonlinearity of the design wave. The rotational safety factor of the breakwater was defined as the ratio of the rotational frictional resistance moment due to caisson's own weight and the acting rotational moment due to the horizontal and vertical wave forces. An analytical solution for the rotational center point location and the minimum safety factor is presented. Stability assessment formula were proposed to be applicable to all design wave conditions used in current port and harbor structure design such as regular waves, irregular waves and multi-directional irregular waves.

인터로킹 케이슨에 의한 장대화된 방파제의 회전 안정성에 대해서 연구하였다. 무한 방파제에 경사지게 입사하는 선형파에 대한 해석해를 이용하여 방파제 기준선 방향으로의 파압 위상차 효과를 고려하였으며, 설계파의 비선형 특성을 고려하기 위하여 설계 기준 Goda 파압식을 차용하였다. 방파제의 회전 안전율을 케이슨 자중에 의한 회전 마찰저항모멘트와 수평 및 수직 파력에 의한 작용 회전모멘트의 비로 정의하고 최소 안전율을 보이는 회전 중심점 위치와 최소 안전율에 대한 해석해를 제시하였다. 규칙파, 불규칙파 및 다방향 불규칙파 등 현행 항만구조물 설계에 사용되고 있는 모든 설계파 조건에 대해서 적용 가능하도록 각 조건에 대한 평가식을 제안하였다.

Keywords

References

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