某核级后备盘台设备地震响应分析与振动台试验研究

Seismic Response Analysis and Qualification Test of a Nuclear-grade Back-up Panel

对核电站主控制室内的后备盘台在地震作用下的地震响应特性进行仿真分析和试验研究。反应谱分析结果表明,后备盘台的最大Mises应力为91.89 MPa,小于结构材料的最大屈服极限,即后备盘台具有良好的抗震性能。时程分析结果表明,随着高度的增加,结构的最大响应加速度幅值逐渐增加,且横向振动幅值增益最为明显。对后备盘台显示屏安装区域的振动信号进行时频分析,得到同一点3个方向的能量峰值均位于2~3 Hz,但出现的时间段各不相同,横向的能量峰值接近于纵向和垂向能量峰值的2倍。地震试验分析结果表明,随着高度增加,振动加速度幅值逐步增大,且在横向上的振动信号放大最为显著,因此抑制后备盘台横向运动是改善结构抗震性能的关键。地震试验后,后备盘台整体结构无变形和破裂,各连接件无松动和脱落,被试盘台通过了地震试验。

Both the numerical analysis and seismic qualification test of the response characteristics of the back-up panel(BUP)in the control room of the nuclear power plant subjected to the earthquake are carried out.The response-spectrum analysis shows that the maximum Mises stress of the BUP is 91.89 MPa,less than the maximum yield limit stress of structural material.Thus,the BUP has ideal aseismic performance.The time-history analysis shows that with the increase of the structure's height,the maximum response of the structure gradually increases,and the vibration amplitude in the lateral direction is the most obvious.Further,time-frequency analysis of the vibration signals in the installation area of the display screen is carried out,revealing that the peak energy in three directions at the same point is mainly located in 2-3 Hz,but the time interval is deferent.The lateral peak energy is about 2 times of the longitudinal and vertical ones.The seismic test and analysis show that with the increase of the height,the amplitude of the vibration acceleration increases gradually,and the vibration signal amplification in the lateral direction is the most significant.Therefore,inhibiting the lateral movement of the BUP is the key to improving the aseismic performance of the structure.After the seismic test,the overall structure of the BUP has no visible deformation or rupture,and the connectors do not loosen or fall off,suggesting that the BUP has passed the seismic test.