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特高压拉线塔拉线的非线性静力特性及其整体简化有限元模型

DOI: 10.13334/j.0258-8013.pcsee.2015.S.032, PP. 232-240

Keywords: 特高压拉线塔,拉线,静力特性,有限元分析,等效弹性模量

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Abstract:

特高压拉线塔拉线的非线性静力分析是进行拉线塔静力特性分析的基础。首先建立特高压拉线塔拉线的静力理论分析模型,给出描述拉线对主柱弹性支撑作用的等效弹性模量公式,研究拉线的非线性静力特性。然后阐述拉线的基于双线性杆单元的整体简化模型,并提出基于多分段线性杆单元的整体简化模型。最后通过特高压拉线塔在大风工况下的算例对整体简化模型进行对比验证。研究结果表明:当拉线弦向伸长量较大时,拉线的等效弹性模量趋近于拉线材料的弹性模量,拉线弦向应力近似随伸长量线性变化;当拉线弦向缩短量较大时,随拉线弦向长度减小,拉线的等效弹性模量变化较慢且值较小;随拉线初应力增大,拉线弦向变形与弦向应力的非线性程度减弱;所提基于多分段线性杆单元的整体简化方法具有较高的精度,是进行特高压拉线塔拉线静力有限元分析的有效方法。

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