Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
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Evaluation of Seismic Fragility of Concrete Faced Rockfill Dam

콘크리트 표면차수벽형 석괴댐의 지진 취약도 평가

  • Baeg, Jongmin (Dept. of Civil and Env. Engineering., Hanyang University) ;
  • Park, Duhee (Dept. of Civil and Env. Engineering., Hanyang University) ;
  • Yoon, Jinam (Dept. of Civil and Env. Engineering., Hanyang University) ;
  • Choi, Byoung-Han (Rural Research Institute, Korea Rural Community Co.)
  • Received : 2018.11.05
  • Accepted : 2018.11.23
  • Published : 2018.12.30
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Abstract

The fragility curves for CFRD dams are derived in this study for probabilistic damage estimation as a function of a ground motion intensity. The dam crest settlement, which is a widely used damage index, is used for minor, moderate, and extensive damage states. The settlement is calculated from nonlinear dynamic numerical simulations. The accuracy of the numerical model is validated through comparison with a centrifuge test. The fragility curve is represented as a log normal distribution function and presented as a function of the peak ground acceleration. The fragility curves developed in this study can be utilized for real time assessment of the damage of dams.

본 연구에서는 지반진동 강도에 따른 콘크리트 표면차수벽 석괴댐(CFRD)의 확률론적 피해예측을 위하여 취약도 함수를 개발하였다. 댐의 손상평가에 널리 사용되는 지표인 댐마루 침하량을 손상지수로 사용하여 경미(Minor), 중간(Moderate), 심각(Severe) 손상수준을 정의하였다. 침하량은 댐 표준단면에 대한 비선형 동적 수치해석을 통하여 계산하였다. 수치해석 모델은 원심모형시험결과와 비교하여 정확성을 검증하였다. 취약도 곡선은 대수정규분포함수로 나타내어 최대지반가속도를 기준으로 도출하였다. 본 연구에서 도출된 취약도 곡선은 댐의 실시간 피해예측에 활용될 수 있을 것으로 판단된다.

Keywords

HKTHB3_2018_v17n4_103_f0001.png 이미지

Fig. 1. Numerical modeling of CFRD typical section

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Fig. 2. Shear wave velocity of rockfill

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Fig. 3. Layouts of model dams and instrumentation in the model scale (Kim et al., 2011)

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Fig. 4. Numerical modeling of CFRD of the centrifuge test

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Fig. 5. Comparison of measured acceleration from centrifuge test and numerical results at selected locations

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Fig. 6. 5% damped response spectrum of input motions and design response spectrum of Korea (MPSS, 2017) normalized to the PGA

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Fig. 7. Fragility curve of CFRD

Table 1. Material properties applied to the CFRD numerical model

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Table 2. Centrifuge material properties (Kim et al., 2011)

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Table 3. Definition of damage states and damage index (Kong et al., 2017)

HKTHB3_2018_v17n4_103_t0003.png 이미지

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