To investigate the seismic performance of base-isolated nuclear power plants in nonrocky soils,a seismic soil-structure interaction(SSI)analysis method for nuclear power engineering structures based on the theory of ex-ternal source wave motion is proposed.This method achieves high-precision input of seismic motion and direct solu-tion of the overall system,with its efficacy confirmed by comparison with the traditional vibration method of a closed system.Furthermore,a comprehensive finite element model of a base-isolated nuclear island building-soil system was established.Seismic response analysis was conducted,and the seismic isolation performance of the nuclear is-land building in nonrocky soils with different shear wave velocities was discussed.The research findings indicated that in nonrocky soils,the base-isolated nuclear island building exhibited remarkable seismic isolation effects.As the shear wave velocity of the site decreased,the seismic isolation capacity of the base isolation gradually de-creased.Compared with a site with a shear wave velocity of 1 067 m/s,when the shear wave velocity of the site was 305 m/s,the seismic isolation rates of the floor response spectra,acceleration amplification factor,and inter-story displacement angle at the top of the nuclear island building structure decreased by 14.30%,13.50%,and 23.41%,respectively.To ensure the safety of nuclear power plants,SSI effects on nonrocky soils should be fully considered in base isolation designs.
关键词
基础隔震/核岛厂房/非基岩场地/土-结构相互作用/外源波动/振动法/剪切波速/地震响应
Key words
base isolation/nuclear island building/nonrocky soils/soil-structure interaction/external source wave motion/vibration method/shear wave velocity/seismic response
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