台山电厂输电线路大跨越钢管塔的结构可靠度分析

Structure reliability analysis of long span transmission line steel pole tower of Taishan electric power plant

采用一次二阶矩可靠度理论对大跨越钢管塔进行了分析,在分析其构件可变荷载效应与永久荷载效应比值范围的基础上,用JC法分析计算了广东省500 kV台山电厂至香山送电线路工程涯门大跨越塔的构件可靠度,通过平稳随机过程模型,近似假设杆塔主材构件可变荷载效应与永久荷载效应同比例增加,计算出该大跨越塔的构件可靠指标β=2.64,结果表明该大跨越输电塔的可靠度高于常规直线型杆塔,但仍低于建筑结构可靠度标准,需在今后的设计工作中引起足够的重视.

Long span crossing steel pole tower was analyzed with first order second moment reliability theory.After the ratio between live load effect and permanent load effect was analyzed,JC methods was used to analyze the reliability of long span crossing steel pole tower of Guangdong 500 KV transmission line from Tai Shan electric power plant to Xiang Shan.According to a stable random process model,the live load effect to permanent load effect of the main member segments increased in the same ratio approximately.The tower structure reliability index was calculated as β=2.64.It showed that the reliability of this long span crossing tower was higher than conventional linear tower,but it still lower than the architecture structure standard,which need to be paid more attention to in future design work.