(中国电力工程顾问集团西南电力设计院有限公司， 成都 610021)

［摘要］±800kV特高压直流重冰区输电铁塔作为目前电网系统中最为复杂的结构之一，若采用传统的桁架模型或梁杆模型进行结构分析，其结果和试验值差异较大。已知螺栓连接滑移会影响结构的刚度分布和承载力，因此考虑螺栓连接滑移对特高压直流重冰区输电铁塔内力性能的影响是十分必要的。以乌东德电站送电广东广西特高压多端直流示范工程中重冰区铁塔为对象，引入非线性弹簧单元，首次建立了该类铁塔的螺栓连接滑移有限元模型，结合铁塔足尺试验结果，进行了多种荷载工况作用下的变形和内力综合分析。结果表明，螺栓连接滑移模型计算结果与试验结果比较吻合，建议针对变形较大的荷载工况如扭转荷载，采用二阶效应弹性分析或者直接分析法进行结构分析，并通过提高整体或局部刚度等构造措施来减小螺栓连接滑移引起的大变形。 

［关键词］特高压直流；重冰区；输电铁塔；螺栓连接滑移；非线性弹簧单元；有限元模型；足尺试验 

中图分类号：TM753,TM721-1 文献标识码：A文章编号：1002-848X(2021)16-0051-07

Analysis of full-scale test and the influence of bolt connection slippage of ±800kV UHVDC transmission tower in heavy ice area 

JIANG  Rui,  LIU  Xiangyun,  HE  Songyang,  YANG  Yang,  LI  Zhangmou,  LI  Lin 

(China Electric Power Engineering Consulting Group Southwest Electric Power Design Institute Co., Ltd., Chengdu 610021， China) 

Abstract: The ±800kV UHVDC transmission tower in heavy ice area is one of the most complex structures in the current power grid system. If the traditional truss model or beam pole model was used for structural analysis, the result will be quite different from the test values. It is known that bolt connection slippage will affect the stiffness distribution and bearing capacity of the structure, so it is necessary to consider the influence of bolt connection slippage on the internal force performance of UHVDC transmission tower in heavy ice area. Taking the tower in heavy ice area of Wudongde Hydropower Station transmission to Guangdong and Guangxi multi-terminal UHVDC demonstration project as the object, the non-linear spring element was introduced, and the finite element model of bolt connection slippage of this kind of tower was established for the first time. Combined with the full-scale test results of the tower, the comprehensive analysis of deformation and internal force under various loads conditions  were carried out. The results show that the calculation results of the bolt connection slippage model are in good agreement with the test results. It is suggested that the second-order effect elastic analysis or direct analysis method should be used for the structural analysis of the load condition with large deformation, such as  torsional load, and the structural measures such as improving the overall or local stiffness should be taken to reduce the large deformation caused by the bolt connection slippage. 

Keywords: UHVDC； heavy ice area； transmission tower； bolt connection slippage； non-linear spring element； finite element model； full-scale test

作者简介：蒋锐，硕士，高级工程师, Email：jiangrui@swepdi.com。