Earthquakes and Structures

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Ratcheting behavior of 90° elbow piping under seismic loading

  • Chen, Xiaohui (School of Control Engineering, Northeastern University) ;
  • Huang, Kaicheng (School of Control Engineering, Northeastern University) ;
  • Ye, Sheng (School of Control Engineering, Northeastern University) ;
  • Fan, Yuchen (School of Control Engineering, Northeastern University) ;
  • Li, Zifeng (School of Mechanical Engineering, Yanshan University)
  • Received : 2019.06.04
  • Accepted : 2019.09.26
  • Published : 2019.11.25
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Abstract

Elastic-plastic behavior of nuclear power plant elbow piping under seismic loads has been conducted in this study. Finite element analyses are performed using classical Bilinear kinematic hardening model (BKIN) and Multilinear kinematic hardening model (MKIN) as well as a nonlinear kinematic hardening model (Chaboche model). The influence of internal pressure and seismic loading on ratcheting strain of elbow pipe is studied by means of the three models. The results found that the predicted results of Chaboche model is maximum, closely followed by the predicted results of MKIN model, and the minimum is the predicted results of BKIN model. Moreover, comparisons of analysis results for each plasticity model against predicted results for a equivalent cyclic loading elbow component and for a simplified piping system seismic test are presented in the paper.

Keywords

Acknowledgement

Supported by : Natural Science Foundation of Hebei Province of China, China Postdoctoral Science Foundation, Central Universities

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