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Seismic performance analyses of reactor building structures in nuclear power plant under strong earthquake motions

GUO Jing;FANG Huolang;ZHANG Yiqun;ZENG Zebin;College of Civil Engineering and Architecture,Zhejiang University;Faculty of Mechanical Engineering and Automation,Zhejiang Sci-Tech University;  
This study focuses on the seismic capacity evaluation of the reactor building structures in a nuclear power plant located in the strong earthquake area abroad.A lumped mass model considering nonlinear shear-flexure interaction behaviors is established and its dynamic elasto-plastic time history analyses are carried out by use of the open-source seismic simulation software Open Sees.The seismic response performances and safety margins of the reactor building structures are investigated under the design and beyond-design basis earthquake motions.The results show that the reactor building structures generate relatively small deformations and are basically in elastic state under the design basis earthquake motion.However,the structures generate relatively large de formations and some parts of structures characterize obvious nonlinear deformation behaviors under two times the design basis earthquake motion,especially the bottom of the prestressed concrete containment vessel reaches to the yielding state in the shear deformation.Although cracking and yielding in some structures appear under two times the design basis earthquake motion,the reactor building structures still remain integral as a whole.Therefore,it can be concluded that the reactor building structures meet the seismic safety requirements and have a certain degree of seismic safety margin.
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