Impact-resistant design of RC slabs in nuclear power plant buildings
Impact-resistant design of RC slabs in nuclear power plant buildings
复制标题
核电站厂房钢筋混凝土板的抗冲击设计
DOI：
10.1016/j.net.2022.05.027
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发表时间：
2022-05
影响因子：
2.7
通讯作者：
L L Ma
中科院分区：
文献类型：
--
作者：
Z C Li;P C Jia;J Y Jia;H Wu;L L Ma
与核安全有关的混凝土结构受到意外冲击荷载的威胁，主要包括低速落锤冲击（如，速度小于20 m/s的乏燃料桶和组件等）和高速射弹撞击（例如，钢管、阀门、涡轮机水斗等），而现有的研究在核电站（NPP）的抗冲击设计方面仍有局限性，尤其是主钢筋混凝土板。本文旨在提出数值模拟和理论方法，以辅助核电厂钢筋混凝土板的抗冲击设计。首先，对抗压强度为20-70 MPa的混凝土连续面帽（CSC）模型参数进行了全面的标定和验证，提出了精细化的数值模拟方法。其次，建立了考虑混凝土板抗弯、抗剪共同作用的二自由度模型。此外，基于低速落锤和高速软硬弹冲击试验，通过混凝土板的弯曲和冲剪损伤、挠度和冲击力时程，对所采用的数值模拟和TDOF模型方法进行了验证。最后，针对两种低速冲击情况，验证并推荐了基于TDOF模型的钢筋混凝土板设计方法。同时，针对4种实际高速碰撞情况，对我国规范NB/T 20012-2019中的抗冲击设计规范进行了评价，发现其存在过度保守的问题，并推荐了所提出的数值计算方法。本文的工作对核电站的抗冲击设计和事故冲击安全评价具有一定的指导意义。
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 20–70 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.
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影响因子：
1.7
作者：
Isao Kojima
通讯作者：
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影响因子：
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作者：
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DOI：
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发表时间：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
1.7
作者：
Y H Yang;W Y Dai;T Huang;H Wu
通讯作者：
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