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Earthquakes and Structures
  Volume 14, Number 1, February 2018, pages 033-44
DOI: http://dx.doi.org/10.12989/eas.2018.14.1.033
 


Effect of the incoherent earthquake motion on responses of seismically isolated nuclear power plant structure
Kaiser Ahmed, Dookie Kim and Sang H. Lee

 
Abstract
    Base-isolated nuclear power plant (BI-NPP) structures are founded on expanded basemat as a flexible floating nuclear island, are still lacking the recommendation of the consideration of incoherent motion effect. The effect of incoherent earthquake motion on the seismic response of BI-NPP structure has been investigated herein. The incoherency of the ground motions is applied by using an isotropic frequency-dependent spatial correlation function to perform the conditional simulation of the reference design spectrum compatible ground motion in time domain. Time history analysis of two structural models with 486 and 5 equivalent lead plug rubber bearing (LRB) base-isolators have been done under uniform excitation and multiple point excitation. two different cases have been considered: 1) Incoherent motion generated for soft soil and 2) Incoherent motion generated for hard rock soil. The results show that the incoherent motions reduce acceleration and the lateral displacement responses and the reduction is noticeable at soft soil site and higher frequencies.
 
Key Words
    incoherent earthquake motion; base-isolated nuclear power plant; seismic response
 
Address
Kaiser Ahmed, Dookie Kim: Department of Civil Engineering, Kunsan National University, Gunsan-si, 54150, Republic of Korea
Sang H. Lee: Power Engineering Research Institute, KEPCO E&C, Gimcheon, Republic of Korea
 

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