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建立了核电站CPR1000堆型反应堆厂房的混合分析模型,上部结构采用集中质点—梁单元,下部筏基采用三维实体单元模拟。完成了对典型核电站结构的基础隔震设计,隔震层设置在筏板基础底面,采用铅芯橡胶支座,支座长期面压控制在5 MPa;比较了隔震前后反应堆厂房的动力特性;基于时程分析法,研究了隔震效果,建立了结构内部设备楼层的楼层反应谱;对隔震前后结构水平向和竖向的楼层反应谱进行了对比分析。结果表明,对于核电站结构采用混合分析模型兼有较高的计算效率和精度;隔震后可明显降低结构的地震反应和楼层反应谱,大大提高结构的抗震安全性。
The mixed analysis model of reactor plant CPR1000 in nuclear power station was established. The upper structure adopts the concentrated particle-beam unit and the lower raft base uses the three-dimensional solid unit simulation. The base isolation design of the typical nuclear power station structure is completed. The seismic isolation layer is set on the bottom of the raft foundation with lead rubber bearing. The long-term surface pressure of the bearing is controlled at 5 MPa. The dynamic characteristics of the reactor building before and after isolation are compared. Based on the time-history analysis method, the seismic isolation effect was studied and the floor response spectrum of the equipment interior floor was built. The horizontal and vertical floor response spectra of the structure before and after isolation were compared and analyzed. The results show that the hybrid analysis model for the structure of nuclear power plant has high computational efficiency and precision. Seismic isolation and floor response spectrum of the structure can be obviously reduced after isolation, greatly improving the seismic safety of the structure.