In the present study, effective hydrodynamic pressure modeling methods for three-dimensional earthquake safety analysis of a dam intake tower structure are investigated. Time history analysis results using the Westergaard added mass and Chopra added mass methods are compared with the one by the CASI (Coupled Acoustic Structural Interaction) method, which is accepted as giving almost exact solutions, to evaluate the difference in displacement response, stress and dynamic eccentricity. The 3D time history analysis of a realistic intake tower, which has the standard geometry widely used in Korea, shows that the Chopra added mass method gives similar results in displacement and stress and less conservative results in dynamic eccentricity to CASI ones, while the Westergaard added mass yields much more conservative results in all measures. This study suggests to use the CASI method directly for three-dimensional earthquake safety analysis of a dam intake tower, if computationally possible.

A B S T R A C T
 1. 서 론
 2. 구조물-유체 상호작용에 따른 동수압 산정
  2.1 부가질량법
  2.2 CASI 기법
  2.3 부가질량법과 CASI 기법의 동수압 비교
 3. 댐 취수탑 구조물에 대한 동적내진해석
  3.1 취수탑 제원 및 수치모형 모델링
  3.2 동적내진해석 결과
 4. 결 론
 REFERENCES

• 송광석(동국대학교 건설환경공학과) | Song, Gwang-Seok
• 민경욱(동국대학교 건설환경공학과) | Min, Kyoung-Uk
• 배정주(한국시설안전공단) | Bea, Jungju
• 이지호(동국대학교 건설환경공학과) | Lee, Jeeho Corresponding author