Journal of the Society of Disaster Information (한국재난정보학회 논문집)

The Korean Society of Disaster Information (한국재난정보학회)
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Soil-structure interaction analysis for the offshore wind tower with bucket foundation

버켓기초를 가진 해상풍력타워의 지반-구조물 상호작용해석

  • Lee, Gyehee (Department of Ocean Civil & Plant Construction Engineering, Mokpo National Maritime University) ;
  • Kim, Sejeong (Plant Structure Team, Chungwoo Co.) ;
  • Phu, Tranduc (Department of Ocean Civil & Plant Construction Engineering, Mokpo National Maritime University)
  • Received : 2014.03.11
  • Accepted : 2014.06.27
  • Published : 2014.06.30
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Abstract

In this study, seismic responses of the offshore wind tower supported by bucket foundation are analyzed in consideration of soil-structure interaction. The program SASSI is used as analyzing tool and an artificial seismic input for soft soil is used as input motion. The H/R ratio of bucket, the stiffness of bucket foundation and the soil stiffness are considered as parameters and its effects are estimated. The responses of structure are obtained at the base and the nacell. As results, the effects of H/R ratio, the stiffness of bucket and the stiffness of site are generally denoted different response tendency at the base and the nacell. However, these whole responses of the base and the nacell are much lager than that of rock site. Therefore, the consideration of this phemomia affect to the response of offshore wind tower with bucket foundation largely.

본 연구에서는 버켓기초로 지지된 해상풍력타워의 지진응답을 지반-구조물 상호작용을 고려하여 해석하였다. 해석프로그램으로는 SASSI를 사용하였으며 연약지반에 대해 생성된 인공지진파를 입력으로 사용하였다. 버켓기초의 형상과 강도를 매개변수로 하여 각 매개변수들의 영향을 파악하였다. 구조물의 응답은 타워의 하부와 나셀위치에서 얻어졌으며 응답스펙트럼으로 비교하였다. 해석결과 형상비, 버켓의 강도, 지반의 강도에 따라서 기초부와 나셀부에서 다른 경향의 응답을 보였다. 그러나 이러한 모든 지반-구조물상호작용의 고려는 암반으로 가정한 거동에 비하여 월등히 큰 응답 값을 보여 이의 고려가 버켓기초를 가진 해상풍력타워의 지진거동에 큰 영향을 미치는 것을 파악할 수 있었다.

Keywords

References

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