[논문]기존 방조제의 내진성능평가 방법 검증

김광준; 김현국; 김성렬; 이진선

doi:10.7843/kgs.2022.38.5.19

기존 방조제의 내진성능평가 방법 검증
Verification of the Seismic Performance Evaluation Methods for Enclosure Dam 원문보기

韓國地盤工學會論文集 = Journal of the Korean geotechnical society, v.38 no.5, 2022년, pp.19 - 33

김광준 (원광대학교 토목환경공학과) , 김현국 (국토안전관리원) , 김성렬 (서울대학교 건설환경공학부) , 이진선 (원광대학교 토목환경공학과)

초록
AI-Helper

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.

Abstract ▼ AI-Helper

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.

주제어

표/그림 (24)

표 Table 1. Seismic performance class and design earthquake of tidal embankment (MAFRA, 2019)
그림 Fig. 1. Comparison of two types of gross-motions (Reproduced from Newmark, 1965)
그림 Fig. 2. Estimation of residual displacement by Newmark sliding block analysis
그림 Fig. 3. Earthquake induced permanent displacement of slope by Newmark's sliding block analysis
그림 Fig. 4. Estimation of slip circle sliding under seismic loading by Newmark’s sliding block analysis (Lee et al., 2019)
그림 Fig. 5. Hysteresis loop constructed using non-linear constitutive model
그림 Fig. 6. Cross section of the enclosure dam used in this study
그림 Fig. 7 Analysis model
표 Table 2. Material properties of the enclosure dam and the subsoil layers
그림 Fig. 8 Non-linear characteristics of the soils in small to medium strain range
표 Table 3. Seismic performance evaluation scheme by analysis methods
표 Table 4. Plasticity index fuction used in Eq. (4)
표 Table 5. Criteria for selecting input earthquake motion histories by countries
표 Table 6. Earthquake bin for seismic performance evaluation of enclousure dam (KALIS, 2021)
표 Table 7. Strong ground motions used in this study
그림 Fig. 9. Spectrum matched earthquake time histories and spectal accelerations
그림 Fig. 10. Safety factor of the slope in normal condition
그림 Fig. 11. Acceleration histories acting on the slip circle
그림 Fig. 12. Numerical model for non-linear response history analysis
그림 Fig. 13. Comparison of acceleration histories acting on the slip circle
표 Table 8. Residual displacement of the enclosure dam by analysis methods and input motions (unit in cm)
그림 Fig. 14. Residual settlement contour with deformed shape for Nahanni earthquake
표 Table 9. Vertical settlement of the enclosure dam at the crest of the embankment (in cm)
표 Table 10. Crest settlement of the example enclosure dam for input motions and the seismic performance evaluation methods (unit in cm)

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