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(中國(guó)電力工程顧問(wèn)集團(tuán)西南電力設(shè)計(jì)院有限公司， 成都 610021)

［摘要］±800kV特高壓直流重冰區(qū)輸電鐵塔作為目前電網(wǎng)系統(tǒng)中最為復(fù)雜的結(jié)構(gòu)之一，若采用傳統(tǒng)的桁架模型或梁桿模型進(jìn)行結(jié)構(gòu)分析，其結(jié)果和試驗(yàn)值差異較大。已知螺栓連接滑移會(huì)影響結(jié)構(gòu)的剛度分布和承載力，因此考慮螺栓連接滑移對(duì)特高壓直流重冰區(qū)輸電鐵塔內(nèi)力性能的影響是十分必要的。以烏東德電站送電廣東廣西特高壓多端直流示范工程中重冰區(qū)鐵塔為對(duì)象，引入非線性彈簧單元，首次建立了該類鐵塔的螺栓連接滑移有限元模型，結(jié)合鐵塔足尺試驗(yàn)結(jié)果，進(jìn)行了多種荷載工況作用下的變形和內(nèi)力綜合分析。結(jié)果表明，螺栓連接滑移模型計(jì)算結(jié)果與試驗(yàn)結(jié)果比較吻合，建議針對(duì)變形較大的荷載工況如扭轉(zhuǎn)荷載，采用二階效應(yīng)彈性分析或者直接分析法進(jìn)行結(jié)構(gòu)分析，并通過(guò)提高整體或局部剛度等構(gòu)造措施來(lái)減小螺栓連接滑移引起的大變形。 

［關(guān)鍵詞］特高壓直流；重冰區(qū)；輸電鐵塔；螺栓連接滑移；非線性彈簧單元；有限元模型；足尺試驗(yàn) 

中圖分類號(hào)：TM753,TM721-1 文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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

作者簡(jiǎn)介：蔣銳，碩士，高級(jí)工程師, Email：jiangrui@swepdi.com。