Abstract
A mainshock can trigger several following severe aftershocks, which may take a threat to the structure. AP1000 nuclear power plant buildings (NPPB) may subject to severe mainshock and aftershock sequences during its whole life cycle. This paper mainly focuses on the seismic behavior of isolated AP1000 NPPB under mainshock and aftershock sequences. A 3D finite element model (FEM) of isolated AP1000 NPPB is established to perform the dynamic analysis. The effects of the mainshock-aftershock sequences on the maximum acceleration, peak displacement, acceleration response spectrum, and stress distribution are carried out using parametric analysis. The results indicate that the aftershock has a small impact on the seismic performance of the isolated nuclear island building (NIB) due to the isolation system. Mainshock and aftershock also influence the floor response spectrum in horizontal directions and the stress state to some extent, but the effects are relatively small compared with the non-isolated NIB.
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