Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Evaluation of Seismic Performance of Pile-supported Wharves Installed in Saturated Sand through Response Spectrum Analysis and Dynamic Centrifuge Model Test

동적원심모형실험 및 응답스펙트럼해석을 통한 포화지반에 관입된 잔교식 안벽의 내진성능 평가

  • Yun, Jung-Won (Dept. of Civil Engrg., Korea Army Academy at Yeongcheon) ;
  • Han, Jin-Tae (Dept. of Geotechnical Engrg. Research, Korea Institute of Civil Engrg. and Building Technology) ;
  • Lee, Seokhyung (Dept. of Geotechnical Engrg. Research, Korea Institute of Civil Engrg. and Building Technology)
  • 윤정원 (육군3사관학교 건설공학과) ;
  • 한진태 (한국건설기술연구원 지반연구본부) ;
  • 이석형 (한국건설기술연구원 지반연구본부)
  • Received : 2021.11.22
  • Accepted : 2021.12.13
  • Published : 2021.12.31
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Abstract

Pile-supported wharf is a structure that can transmit and receive cargo, and it is mainly installed on saturated inclined ground. In the seismic design of these structures, the codes suggest using the response spectrum analysis method as a preliminary design method. However, guideline on modeling method for pile-supported wharf installed in saturated soil is lacking. Therefore, in this study, the dynamic centrifuge model test and response spectrum analysis were performed to evaluate the seismic performance of pile-supported wharf installed into the saturated soil. For the test, some sections (3×3 pile group) among the pile-supported wharf were selected, and they were classified into two model (dry and saturated sand model). Then the response spectrum analysis was performed by using the soil spring method to the test model. As a result of test and analysis, the m om ent difference occurred within a m axim um of 51% in the dry sand m odel and the saturated sand model where liquefaction does not occur, and it was found that the pile moment by depth was properly simulated. Therefore, in the case of these models, it is appropriate to perform the modeling using the Terzaghi (1955) constant of horizontal subgrade reaction (nh)

잔교식 구조물은 선박을 안전하게 접안하여 화물을 송수신할 수 있는 구조물로서, 포화된 경사지반에 주로 설치된다. 이러한 잔교식 구조물의 내진설계 시 기준서에서는 예비 설계 방법으로 응답스펙트럼해석법을 활용하도록 제시하고 있으나, 현재 포화지반에 관입된 잔교식 구조물의 모델링 방법에 대한 지침은 부족한 실정이다. 그러므로 본 연구에서는 포화지반에 관입된 잔교식 구조물의 내진성능을 평가하기 위해 동적원심모형실험 및 응답스펙트럼해석을 수행하였다. 동적원심모형실험을 위해 잔교식 안벽 말뚝 중 일부 구간(3×3 군말뚝)을 선정하였으며, 지반 포화 여부에 따라 2가지 모델(건조, 포화)로 분류하였다. 이후 실험 모델에 지반 스프링 방법을 적용하여 응답스펙트럼해석을 수행하였다. 실험 및 해석을 비교한 결과, 건조지반 모델 및 액상화가 발생하지 않는 포화지반 모델의 경우 모멘트 차이가 최대 51% 이내로 발생하였으며, 깊이 별 모멘트를 적절히 모사하는 것으로 나타났다. 그러므로 본 모델의 경우 Terzaghi(1955)가 제시한 수평지반반력상수를 활용하여 모델링을 수행하는 것이 적절한 것으로 판단된다.

Keywords

Acknowledgement

본 논문은 한국건설기술연구원 주요사업 'Tech-lead형 액상화 위험지도 작성기술 고도화연구(20210162)'의 지원을 받았으며, 윤정원의 2021년도 박사학위논문 중 일부 내용을 재구성하여 작성하였습니다.

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