Risk Assessment of Aged Concrete Gravity Dam Subjected to Material Deterioration Under Seismic Excitation

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) depending on two failure states has been used in the analysis. It represents the...

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Bibliographic Details
Published in:International journal of concrete structures and materials 2020-12, Vol.14 (1), p.1-17, Article 53
Main Authors: Nahar, Tahmina Tasnim, Cao, Anh-Tuan, Kim, Dookie
Format: Article
Language:English
Subjects:
Building Materials
capacity evaluation
Case studies
Dams
Engineering
fragility function
relative displacement
Risk assessment
seismic behavior
Solid Mechanics
South Korea
Structural Materials
tensile cracking
time-variant degradation
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Summary: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) depending 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 a way to estimate the CAV limit 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.
ISSN:1976-0485
2234-1315
DOI:10.1186/s40069-020-00430-z