高频地震激励对核级阀门危害性分析  

Hazard Analysis of Nuclear Safety Class Valve Induced by High Frequency Seismic Excitation

作　　者：薛睿渊 俞树荣[1] 张希恒[1] XUE Ruiyuan;YU Shurong;ZHANG Xiheng(College of Petrochemical Technology,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050

出　　处：《原子能科学技术》2020年第9期1691-1698,共8页Atomic Energy Science and Technology

摘　　要：利用试验和修正后的集中质量有限元模型预测安装在管道中阀门在不同频率成分地震激励下的响应,研究高频地震激励对管道中质量较大核级阀门的危害性。研究结果表明:高频地震激励对核级阀门的危害在于使阀门以其自身固有振型发生共振,此时阀门顶部取代阀门与管道连接位置成为阀门中响应最大的位置,这会导致安装于阀门顶端的驱动机构遭受苛刻的地震工况。增加管道阻尼和阀门刚度能有效降低高频激励对阀门的危害,但增加阀门刚度会导致管道响应增大。利用等效静力法对阀门进行抗震鉴定时,分析结果对阀体水平部位内力估计不足,对阀体垂直部分、阀盖等阀门上部构件的内力估计结果具有较大裕度。The test and the updated lumped mass finite element model were used to predict the response of the valve installed in the pipeline under the seismic excitation of different frequency components,and the hazard of high frequency seismic excitation to large-mass nuclear safety class valves in the pipeline was studied.The results show that the high frequency seismic excitation causes the nuclear safety class valve to resonate with its own mode of vibration.At this moment,the top of the valve replaces the position where the valve is connected to the pipe to become the position with the largest response amplitude in the valve,which causes the drive mechanism installed on the top of the valve to suffer severe seismic conditions.Increasing the pipe damping and valve stiffness can effectively reduce the hazard of high frequency excitation to the valves,but increasing the valve stiffness will lead to the increase of the pipe response amplitude.When the equivalent static method is used for seismic identification of the valve,the analysis result is insufficient to estimate the internal force of the horizontal part of the valve body,and has a large margin to estimate the internal force of the vertical part of the valve body,the valve cover and other upper parts of the valve.

关 键 词：阀门 抗震鉴定 地震模拟试验 高频激励 

分 类 号：TH113.1[机械工程—机械设计及理论] TL353[核科学技术—核技术及应用]