为探究超、特高压交直流同塔多回线路杆塔可靠度指标的影响因素;并对构件可靠度指标的提高措施进行研究,依照国家现行规范,采用一阶可靠性方法(FORM)对河西走廊即将实施的±800 kV/750 kV交直流同塔多回线路杆塔进行了详细的可靠度分析.分析结果表明:可变荷载效应比重、线条风荷载效应比重、轴心受力强度、轴心受压稳定以及风荷载重现期对可靠度指标均有一定影响;通过提高结构重要性系数能够提高杆塔构件的可靠度指标;但同时伴随着塔重的增加,以及更大经济的投入.%To explore the influencing factors of the reliability index of extra and ultra high voltage AC and DC tower with multi-circuit lines,and research some measures to improve the reliability of member,the FORM is used to analyze reliability of ± 800 kV/750 kV AC and DC towers with multi-circuit lines according to current national code in Hexi Corridor.The result indicates:the ratio of variable load effect、the ratio of string wind load effect,strength of axially loaded member,stability of axial compression member and the recurrence interval of wind load all have some influence on the reliability index;improving the coefficient for importance of structure can improve the reliability index of tower's member,but with the increasing of tower's weight and invest.
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