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Title |
Conservation for the Seismic Models of Intake Tower with Nonlinear Behaviors and Fluid Structure Interaction
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Authors |
이계희(Gye-Hee Lee) ; 이명규(Myoung-Kyu Lee) ; 홍관영(Kwan-Young Hong) |
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DOI |
https://doi.org/10.11112/jksmi.2020.24.6.17 |
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Keywords |
취수탑; 콘크리트 비선형해석; 내진해석; 부가질량모델; CEL 유체구조물 상호작용 Intake Tower; Concrete Nonlinear Analysis; Seismic Analysis; Added Mass Model. CEL(Coupled Eulerian Lagrangian) Fluid-Structure Interaction |
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Abstract |
In this study, series of nonlinear seismic analysis were performed on a reinforced concrete intake tower surrounded by water. To consider the fluid effect around the structure, analysis models were composed using an added mass and CEL approach. At this time, the implicit method was used for the added mass model, and the explicit method was used for the fluid structure interaction model. The input motions were scaled to correspond to 500, 1000, and 2400 years return period of the same artificial earthquake. To estimate the counteractivity of the fluid coupled model, models without fluid effect were constructed and used as a reference. The material models of concrete and reinforcement were selected to consider the nonlinear behavior after yielding, and analysis were performed by ABAQUS. As results, in the acceleration response spectrum of the structure, it was found that the influence of the surrounding fluid reducing the peak frequency and magnitude corresponding to the fundamental frequency of the structure. However, the added mass model did not affect the peak value corresponding to the higher mode. The sectional moments were increased significantly in the case of the added mass model than those of the reference model. Especially, this amplification occurred largely for a small-sized earthquake response in which linear behavior is dominant. In the fluid structure interaction model, the sectional moment with a low frequency component amplifies compared to that of the reference model, but the sectional moment with a high requency component was not amplified. Based in these results, it was evaluated that the counteractivity of the additive mass model was greater than that of the fluid structure interaction model.
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