摘要
采用随机有限元方法对受损伤的变电站人字型变电构架进行了可靠性计算分析。分析中主要考虑了材料和荷载的不确定性以及构件的损伤。分析结果表明,用随机有限元计算受损伤的人字型变电构架的随机响应是可行的。利用计算出的随机响应量的统计参数,在假定其分布后,可以用一次二阶矩法估算结构控制截面的可靠度指标,进而可以讨论损伤对构架控制截面可靠度指标的影响,并为下一步的模糊综合评判奠定了基础。
This paper adopts stochastic finite element method to calculate and analyze the reliability of weakened λ-shaped power-transformed frames. The uncertainties of materials and loads as well as the weaknesses of members are mainly taken into account in analysis. The analytic results has shown that it is practicable to calculate the stochastic response of weakened λ-shaped power-transformed frames with the stochastic finite element method. After assuming the distributions of the calculated statistic parameters of the stochastic responses, the indices of reliability of critical sections in structures can be estimated with first power-second moment method. Then a further discussion on the influences towards the frames' critical sections' indices of reliability caused by the weaknesses can be taken, and the foundation for the next step' s ambiguous syntheses judgement has been established accordingly.
出处
《河南科学》
2003年第3期299-303,共5页
Henan Science
关键词
变电站
随机有限元方法
人字型变电构架
可靠性
构件损伤
perturbation
stochastic finite element
weakness
stochastic variable
A-shaped power-transformed frames
degree of reliability
