| 重冰区输电塔-线体系脱冰振动的数值模拟 |
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| 引用本文： | 晏致涛,李正良,汪之松.重冰区输电塔-线体系脱冰振动的数值模拟[J].工程力学,2010(1). |
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| 作者姓名： | 晏致涛 李正良 汪之松 |
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| 作者单位： | 重庆大学土木工程学院; |
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| 基金项目： | 国家自然科学基金项目(50708118,50678181);;重庆市自然科学基金项目(CSTC,2007BB0133) |
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| 摘 要： | 重冰区架空线路的脱冰振动可能造成金具损坏、导线断股、杆塔折损等机械事故,也可能造成闪络、烧断导线等电气事故。考虑几何非线性的影响,采用有限元理论建立了输电线路塔-线体系的脱冰振动精细化数值分析模型。以向家坝―上海800kV特高压直流输电线路为例进行了脱冰振动分析,分析了脱冰工况下导(地)线跳跃高度、最大水平张力、绝缘子内力和摆动位移、支座反力等变化规律。结果表明:导线脱冰振动将引起较大的竖向振动,导线最大水平张力增大了近20%,输电塔支座反力增大了约30%。基于上述模型,进行了12种工况下的参数分析,探讨了脱冰程度、绝缘子摆动刚度、阻尼比、不等跨、跨数、风荷载等参数对脱冰振动的影响规律。
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| 关 键 词： | 有限元模拟 非线性 覆冰导线 脱冰 输电线 |
SIMULATION OF ICE-SHEDDING OF TRANSMISSION TOWER-LINE SYSTEM IN HEAVY ICE REGIONS |
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| YAN Zhi-tao,LI Zheng-liang,WANG Zhi-song.SIMULATION OF ICE-SHEDDING OF TRANSMISSION TOWER-LINE SYSTEM IN HEAVY ICE REGIONS[J].Engineering Mechanics,2010(1). |
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| Authors: | YAN Zhi-tao LI Zheng-liang WANG Zhi-song |
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| Affiliation: | College of Civil Engineering;Chongqing University;Chongqing 400045;China |
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| Abstract: | The vibration of overhead lines caused by ice-shedding in ice regions may damage metal members and wires stocks,even result in tower collapsed and other machinery accidents.A refined ice-shedding vibration model of transmission tower-line system is established by finite element method considering geometric nonlinearity.Taking the 800 kV transmission line UHV DC from Xiangjiaba to Shanghai as an example,the ice-shedding vibration is analyzed,obtaining the high-jump,the biggest horizontal tension forces,the s... |
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| Keywords: | finite element modeling nonlinear iced cables ice-shedding transmission lines |
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