Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Evaluation of Seismic Performance of Pile-supported Wharves with Batter Piles through Response Spectrum Analysis

응답스펙트럼해석을 통한 경사말뚝이 설치된 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) ;
  • Kim, JongKwan (Dept. of Geotechnical Engrg. Research, Korea Institute of Civil Engrg. and Building Technology)
  • 윤정원 (육군3사관학교 건설공학과) ;
  • 한진태 (한국건설기술연구원 지반연구본부) ;
  • 김종관 (한국건설기술연구원 지반연구본부)
  • Received : 2021.11.19
  • Accepted : 2021.12.10
  • Published : 2021.12.31
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Abstract

The pile-supported wharf is the port structure in which the upper deck is supported by piles or columns. By installing batter piles in this structure, horizontal load such as earthquake loads can be partially delivered as axial forces. The codes suggests using the response spectrum analysis as a preliminary design method for seismic design of pile-supported wharf, and suggests modeling the piles using virtual fixed points or soil spring methods for this analysis. Recently, several studies have been conducted on pile-supported wharves composed of vertical piles to derive a modeling method that appropriately simulates the dynamic response of structures during response spectrum analysis. However, studies related to the response spectrum analysis of pile-supported wharves with batter piles are insufficient so far. Therefore, this study performed the dynamic centrifuge model test and response spectrum analysis to evaluate the seismic performance according to the modeling method of pile-supported wharves with batter piles. As a result of test and analysis, it is confirmed that modeling using the Terzaghi (1955) constant of horizontal subgrade reaction (nh) most appropriately simulates the actual response in the case of the pile-supported wharf with batter piles.

잔교식 구조물은 상판을 말뚝 또는 기둥으로 지지하는 형식의 항만 구조물로서, 경사 말뚝을 설치하여 지진하중과 같은 수평하중을 부분적으로 축력으로 분담하도록 설계할 수 있다. 기준서에서는 잔교식 구조물 내진설계 시 예비 설계 방법으로 응답스펙트럼해석법을 활용하도록 설명하고 있으며, 응답스펙트럼 해석 시 말뚝을 가상고정점 방법 및 지반스프링 방법을 적용하여 모델링하도록 제시하고 있다. 최근 응답스펙트럼해석 시 구조물의 동적 응답을 적절히 모사하는 모델링 방법을 도출하기 위해 연직 말뚝으로 구성된 잔교식 구조물에 관한 몇몇 연구들이 수행되어 왔으나, 현재까지 경사말뚝이 적용된 잔교식 구조물에 대한 응답스펙트럼해석 관련 연구는 부족한 실정이다. 그러므로 본 연구에서는 경사말뚝이 설치된 잔교식 구조물의 모델링 방법에 따른 내진성능을 평가하기 위해 동적원심모형실험과 더불어 응답스펙트럼 해석을 수행하였다. 실험 및 해석을 비교한 결과, 경사말뚝이 설치된 잔교식 구조물의 경우 실제 응답을 적절히 모사하기 위해 Terzaghi(1955)가 제시한 수평지반반력상수를 활용하여 모델링을 수행하는 것이 적절한 것으로 나타났다.

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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