Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Verification of the Seismic Performance Evaluation Methods for Enclosure Dam

기존 방조제의 내진성능평가 방법 검증

  • Kim, Kwangjoon (Dept. of Civil and Environmental Eng., Wonkwang Univ.) ;
  • Kim, Hyunguk (Korea Authority of Land & Infrastructure Safety) ;
  • Kim, Sung-Ryul (Dept. of Civil and Environmental Eng., Seoul National Univ.) ;
  • Lee, Jinsun (Dept. of Civil and Environmental Eng., Wonkwang Univ.)
  • 김광준 (원광대학교 토목환경공학과) ;
  • 김현국 (국토안전관리원) ;
  • 김성렬 (서울대학교 건설환경공학부) ;
  • 이진선 (원광대학교 토목환경공학과)
  • Received : 2022.02.14
  • Accepted : 2022.03.30
  • Published : 2022.05.31
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Abstract

Newmark's sliding block analysis is the most commonly used method for predicting earthquake-induced permanent displacement of embankment slopes. Additionally, it yields the amount of slip circle sliding using the limit equilibrium theory. Thus, permanent displacement does not occur until the seismic load exceeds the yield acceleration, which induces sliding of the slip circle. The evolution of Newmark's sliding block analysis has been made by introducing the numerical seismic response analysis results since it was introduced. This study compares seismic performance evaluation results for the example enclosure dam section with the analysis methods. As a result, earthquake-induced permanent displacement using Newmark's sliding block analysis did not occur for the enclosure dam, indicating a high safety factor. However, nonlinear response history analysis gave reasonable results.

지진시 성토사면의 잔류변위 예측에 가장 많이 사용되는 방법은 Newmark변위법이다. Newmark변위법은 지진시 강체원호의 관성력에 의한 미끌어짐량을 산정하는 방법으로 한계상태평형이론에 근거하여 산정된다. 따라서, 원호의 미끌어짐이 발생하지 않는 항복가속도 이하의 지진이 발생하는 경우 잔류변위가 발생하지 않는다고 가정한다. Newmark 변위법은 최초 제안 이후 지진응답해석기법의 결과를 도입하는 방향으로 개선되었다. 본 논문에서는 방조제 예제 단면에 대해서 Newmark변위법의 적용방법과 비선형응답이력 해석을 통한 내진성능평가 결과의 차이를 살펴보았다. 검토 결과, 설계안전율이 큰 방조제 제체에서는 Newmark변위법에 의한 잔류변위는 거의 발생하지 않았다. 반면, 비선형 응답이력해석의 결과는 비교적 유의미한 잔류변위를 나타냄을 알 수 있었다.

Keywords

Acknowledgement

이 논문은 2021학년도 원광대학교의 교비지원에 의해 수행됨.

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