Impact-resistant design of RC slabs in nuclear power plant buildings

Li Z.C.; Jia P.C.; Jia J.Y.; Wu H.; Ma L.L.

doi:10.1016/j.net.2022.05.027

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자료유형: 학술저널

저자정보: Li Z.C. (China Nuclear Power Engineering Co., Ltd) Jia P.C. (College of Civil Engineering, Tongji University) Jia J.Y. (China Nuclear Power Engineering Co., Ltd) Wu H. (College of Civil Engineering, Tongji University) Ma L.L. (College of Civil Engineering, Tongji University)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제54권 제10호

발행연도: 2022.10

수록면: 3,745 - 3,765 (21page)

DOI: 10.1016/j.net.2022.05.027

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The concrete structures related to nuclear safety are threatened by accidental impact loadings, mainly including the low-velocity drop-weight impact (e.g., spent fuel cask and assembly, etc. with the velocity less than 20 m/s) and high-speed projectile impact (e.g., steel pipe, valve, turbine bucket, etc. with the velocity higher than 20 m/s), while the existing studies are still limited in the impact resistant design of nuclear power plant (NPP), especially the primary RC slab. This paper aims to propose the numerical simulation and theoretical approaches to assist the impact-resistant design of RC slab in NPP. Firstly, the continuous surface cap (CSC) model parameters for concrete with the compressive strength of 20 e70 MPa are fully calibrated and verified, and the refined numerical simulation approach is proposed. Secondly, the two-degree freedom (TDOF) model with considering the mutual effect of flexural and shear resistance of RC slab are developed. Furthermore, based on the low-velocity drop hammer tests and high-speed soft/hard projectile impact tests on RC slabs, the adopted numerical simulation and TDOF model approaches are fully validated by the flexural and punching shear damage, deflection, and impact force time-histories of RC slabs. Finally, as for the two low-velocity impact scenarios, the design procedure of RC slab based on TDOF model is validated and recommended. Meanwhile, as for the four actual high-speed impact scenarios, the impact-resistant design specification in Chinese code NB/T 20012-2019 is evaluated, the over conservation of which is found, and the proposed numerical approach is recommended. The present work could beneficially guide the impact-resistant design and safety assessment of NPPs against the accidental impact loadings.

#Impact-resistant design #Nuclear power plant #Continuous surface cap model #Numerical simulation #TDOF model

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