Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Experimental research on vertical mechanical performance of embedded through-penetrating steel-concrete composite joint in high-temperature gas-cooled reactor pebble-bed module

  • Zhang, Peiyao (School of Transportation Science and Engineering, Beihang University) ;
  • Guo, Quanquan (School of Transportation Science and Engineering, Beihang University) ;
  • Pang, Sen (Research and Development Center, Beijing Building Research Institute Co. Ltd of CSCEC) ;
  • Sun, Yunlun (Chinergy Technology Co. Ltd) ;
  • Chen, Yan (Chinergy Technology Co. Ltd)
  • Received : 2020.08.13
  • Accepted : 2021.07.13
  • Published : 2022.01.25
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Abstract

The high-temperature gas-cooled reactor pebble-bed module project is the first commercial Generation-IV NPP(Nuclear Power Plant) in China. A new joint is used for the vertical support of RPV(Reactor Pressure Vessel). The steel corbel is integrally embedded into the reactor-cabin wall through eight asymmetrically arranged pre-stressed high-strength bolts, achieving the different path transmission of shear force and moment. The vertical monotonic loading test of two specimens is conducted. The results show that the failure mode of the joint is bolt fracture. There is no prominent yield stage in the whole loading process. The stress of bolts is linearly distributed along the height of corbel at initial loading. As the load increases, the height of neutral axis of bolts gradually decreases. The upper and lower edges of the wall opening contact the corbel plate to restrict the rotation of the corbel. During the loading, the pre-stress of some bolts decreases. The increase of the pre-stress strength ratio of bolts has no noticeable effect on the structure stiffness, but it reduces the ultimate bearing capacity of the joint. A simplified calculation model for the elastic stage of the joint is established, and the estimation results are in good agreement with the experimental results.

Keywords

Acknowledgement

This work was supported by National Natural Science Foundation of China (Grant No. 51778032). The authors greatly appreciate the financial support. However, the opinions presented in this paper do not necessarily reflect the views of the sponsors.

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