Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Evaluation of Seismic Performance of Takahama Wharf Using Nonlinear Effective Stress Analysis

비선형 유효응력해석을 이용한 Takahama 잔교식 안벽의 내진성능 평가

  • ;
  • 이진선 (원광대학교 토목공학부) ;
  • 김성렬 (동아대학교 토목공학과)
  • Received : 2017.03.03
  • Accepted : 2017.04.13
  • Published : 2017.04.30
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Abstract

Aseismic designs of pile-supported wharves are commonly performed utilizing simplified dynamic analyses, such as multi-mode spectral analyses. Simplified analyses can be useful for evaluating the limit state of structures. However, several pile-supported wharves, that have been damaged during past earthquakes, have shown that soil deformation and soil-pile dynamic interaction significantly affect the entire behavior of structures. Such behavior can be captured by performing nonlinear effective stress analyses, which can properly consider the dynamic interactions among the soil-pile-structure. The present study attempts to investigate the earthquake performance of a pile-supported wharf utilizing a three-dimensional numerical method. The damaged pile-supported wharf at the Kobe Port during the Hyogo-ken Nambu earthquake (1995) is selected to verify the applicability of the numerical modeling. Analysis results showed a suitable agreement with the observations on the damaged wharf, and the significant effect of excess pore pressure development and pile-soil dynamic interaction on the seismic performance of the wharf.

잔교식 안벽의 내진설계는 보통 다중모드 스펙트럼 해석과 같은 단순 동해석 방법을 적용하여 수행된다. 이러한 단순 해석법은 구조물의 한계상태를 평가하는데 유용할 수 있다. 그러나, 과거에 발생한 잔교식 안벽의 지진피해사례를 살펴보면, 기초지반의 변형 또는 지반-말뚝 사이의 동적 상호작용이 구조물의 전체 거동에 큰 영향을 미치는 것으로 나타났다. 이러한 거동은 지반-말뚝-구조물 동적 상호작용을 정밀하게 모사할 수 있는 비선형 유효응력 해석을 수행하여 평가할 수 있다. 본 연구에서는 잔교식 안벽의 내진성능을 평가할 수 있는 3차원 수치 모델링 기법을 선정하고, 이를 Hyogoken Nambu 지진(1995)시 고베항의 잔교식 안벽 피해사례에 적용하여 그 적용성을 검증하였다. 해석결과, 본 연구에서 적용한 수치 모델링 기법이 안벽의 지진피해 거동을 잘 모사할 수 있으며, 지반의 과잉간극수압증가 및 지반-구조물과의 동적 상호작용이 안벽의 지진거동에 큰 영향을 주는 것으로 나타났다.

Keywords

References

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