摘要
流动加速腐蚀造成核电厂二回路碳钢管道发生非均匀腐蚀。根据腐蚀的随机性,基于马尔科夫链理论,提出管线腐蚀模型,导出管线腐蚀剩余有效截面面积随时间变化的概率分布。提出核电腐蚀管道简化计算模型,推导出腐蚀核电管线的地震反应表达式。利用Monte Carlo方法求出了腐蚀管线在地震激励下轴向位移和轴向应力反应的均值和方差。建立了腐蚀核管线的失效极限状态方程,采用一次二阶矩JC法分析了腐蚀核管道在计算时间时的抗震可靠性指标。对核电二回路管道的抗震评估和震后修复提供了工程参考。
The flow accelerated corrosion （FAC） is one of the main causes of the non-uniform corrosion in seconda- ry loop piping system in nuclear power plant. A corrosion model for nuclear pipes is presented based on the Markov chain method considering the randomness of corrosion so that the time-dependent probability distribution of the re- sidual effective section area of corroded pipes is derived. The simplified calculation model for corroded nuclear pipes is given to derive the responses under earthquake. The Monte Carlo method is used to calculate the mean val- ue and standard derivation of axial displacement and stress for corroded pipes under the action of earthquake. The First Order Second Moment method is used to analyze the seismic reliability of corroded pipes based on the estab- lished failure model. The methods discussed in this paper provide an engineering reference for seismic evaluation and renovation of the nuclear piping system.
出处
《世界地震工程》
CSCD
北大核心
2015年第4期264-269,共6页
World Earthquake Engineering
基金
国家自然科学基金重点基金(51138001)
关键词
核电管道
马尔科夫链
管线腐蚀模型
地震激励
可靠度
nuclear pipe
markov chain
corrosion model
earthquake excitation
seismic reliability
