Seismic performance analysis of base-isolated nuclear island building in nonrocky soils
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.
base isolationnuclear island buildingnonrocky soilssoil-structure interactionexternal source wave motionvibration methodshear wave velocityseismic response
万方数据
维普
