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한국콘크리트학회|IJCSM 2020년 11월

논문명 Risk Assessment of Aged Concrete Gravity Dam Subjected to Material Deterioration Under Seismic Excitation
저자명 (Tahmina Tasnim Nahar) ; (Anh-Tuan Cao) ; (Dookie Kim)
발행사 한국콘크리트학회
수록사항 IJCSM, Vol.14 No.6 (2020-11)
페이지 시작페이지(959) 총페이지(17)
ISSN 1976-0485
주제분류 재료 / 구조
주제어 ; capacity evaluation; seismic behavior; time-variant degradation; tensile cracking; relative displacement; fragility function; cumulative absolute velocity; capacity model
요약2 This paper proposes an approach to assess and predict the seismic risk of existing concrete gravity dams (CGDs) considering the ageing effect. The combination of fragility function and cumulative absolute velocity (CAV) depend-ing on two failure states has been used in the analysis. It represents the time-variant degradation of the concrete structure and the conditional change of structural vulnerability in the case of the seismic excitation. Therefore, the seismic risk assessment captures here the nonlinear dynamic behavior of a concrete gravity dam through the fragility analysis. Incremental dynamic analysis for the fragility curves is adopted to state the performance of the dam in terms of different intensity measures. To assess the capacity of the aged concrete gravity dam, this research introduces away to estimate the CAVlimit of CGDs with varying time. For a case study, an existing concrete gravity dam in Korea has been taken into consideration to apply this approach. The numerical finite element model is validated by optimizing the recorded field data. The proposed approach and its findings will be helpful to CGDs operators to ensure whether a dam needs to stop after a specific time using the extracted mathematical model. Furthermore, as this mathematical model is the function of time, the operator can get an idea about dam conditions at any specific time and can take necessary steps.
소장처 한국콘크리트학회
언어 영어
DOI https://doi.org/10.1186/s40069-020-00430-z