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电网技术  2010 

1000kV双回路钢管塔次应力的影响因素

, PP. 20-23

Keywords: 特高压钢管塔,杆单元,梁单元,次应力

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Abstract:

对我国第一基1000kV交流特高压双回路钢管塔(SZT2塔)进行了真型试验。用输电铁塔设计软件建立了SZT2塔杆单元桁架模型;在限元软件ANSYS平台上,建立了SZT2塔梁–杆混合桁架模型。将SZT2塔的杆单元桁架模型与梁–杆混合桁架模型的计算结果进行了对比,并与试验实测结果进行了比较,得出了其次应力分布规律及影响因素。结果表明对SZT2塔次应力影响最大的位置在塔身变坡处,在其它条件不变的前提下,次应力影响随杆件长径比的增加而减小;SZT2塔身主材次应力最大已达到30%,在设计时应予以考虑。

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