500kV输电线路杆塔结构的可靠性分析

Reliability Analysis on Tower Structure for 500 kV Transmission lines

采用一次二阶矩法对不同时期的500kV线路进行了可靠度校准,并采用Ditlevsen算法计算了杆塔结构体系的可靠度,对实际的杆塔失效概率进行了统计分析。根据结构构件的可靠度计算结果,分析了我国不同历史时期设计的500kV输电杆塔的可靠度水平;理论可靠度计算与实际失效概率统计结果表明,我国500kV输电线路杆塔结构的可靠度水平在不断提高。

The reliability calibration for 500 kV transmission lines built in verious periods is conducted by first-order second-moment method; the reliability of tower system is calculated by Ditlevsen algorithm; and the statistical analysis is applied to the failure probability of actual towers. According to the reliability comutation results of structural elements, the reliability levels of towers designed for 500 kV transmission lines in different historical periods in China are analyzed. The results from theoretical reliability computation and statistical results of practical failure probability show that the reliability level of tower structure for 500 kV transmission lines in China is being improved increasingly.