A seismic response analysis method for three-dimensional floating offshore structures due to seaquakes is developed. The hydrodynamic pressure exerted on the structure is calculated taking into account the compressibility of the sea water, the fluid-structure interaction, the energy absorption by the seabed, and the energy radiation into infinity. To validate developed method, the hydrodynamic pressure induced by the vibration of a floating massless rigid circular disk is calculated and compared with an exact analytical solution. The developed method is applied to seismic analysis of a support structure for a floating offshore wind turbine subjected to the hydrodynamic pressures induced from a seaquake. Analysis results show that earthquake response of a floating offshore structure can be greatly influenced by the compressibility of fluid, the depth (natural frequencies) of the fluid domain, and the energy absorption capacity of the seabed.

1. 서 론
 2. 부유식 해양구조물의 3차원 운동에 대한 지배방정식
 3. 구조물에 작용하는 유체의 동수압
  3.1 유체 근역의 운동방정식
  3.2 유체 원역의 지배 운동방정식
  3.3 유체 원역의 자유장 문제
  3.4 유체 원역의 파 방사 문제
  3.5 구조물에 작용하는 동수압
 4. 부유식 해양구조물 시스템의 지배 운동방정식
 5. 검증 및 적용 예제
  5.1 무질량 강체 원형판의 강제진동 해석
  5.2 부유식 해양구조물의 지진응답 해석
 6. 결 론
 / 감사의 글 /
 / REFERENCES
 부록
  1) 무질량 강체 원형판의 강제진동에 대한 해석해
  2) 유체 정역학 강성 행렬

• 이진호(한국철도기술연구원 자기부상철도연구팀) | Jin Ho Lee Corresponding author
• 김재관(서울대학교 건설환경공학부) | Jae Kwan Kim