输电塔-线体系覆冰作用非线性分析
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摘要
在重冰区,高柔大跨越输电塔-线体系在覆冰、风载等作用下具有强烈的耦合特性和非线性特征。推导了绝缘子、索以及边界条件的刚度表达式,以向家坝-上海±800 kV特高压直流输电线路为例,建立了输电塔、导线、绝缘子以及边界条件的简化数值分析模型。对大跨越输电塔-线体系进行了7种工况下的静力非线性分析。分析表明,在导线均匀覆冰及风荷载作用下,铁塔构件的P-Δ效应较小;在不均匀覆冰工况下,导线不平衡荷载对铁塔产生扭转效应,铁塔受压支座节点和最大悬臂处单元的轴向压力和弯矩具有较明显的P-Δ效应,应考虑荷载非线性的不利影响。
The intense coupled and nonlinear behaviors were observed on the tall long-span tower-line systems which were under the icing and wind loads in heavy icing areas.A set of stiffness equations of insulator,conductor and boundary conditions was deduced.Taking the ±800 kV UHV DC transmission line from Xiangjiaba to Shanghai as an example,the simplified numerical model of transmission tower,conductor,insulator and constraint was developed.The long span transmission tower-line system models under seven loads conditions were analyzed by static nonlinear methods.It was found that the P-Δ effect of tower components was small when the covered ice was uniformly distributed.The unbalanced wire loads on the tower would lead to twist effect when the covered ice was uneven distributed.The axial forces,moments at restraint nodes and the longest cantilever member were greatly affected by the P-Δ effect,under which the unfavorable effect on the structure should be considered.
The intense coupled and nonlinear behaviors were observed on the tall long-span tower-line systems which were under the icing and wind loads in heavy icing areas.A set of stiffness equations of insulator,conductor and boundary conditions was deduced.Taking the ±800 kV UHV DC transmission line from Xiangjiaba to Shanghai as an example,the simplified numerical model of transmission tower,conductor,insulator and constraint was developed.The long span transmission tower-line system models under seven loads conditions were analyzed by static nonlinear methods.It was found that the P-Δ effect of tower components was small when the covered ice was uniformly distributed.The unbalanced wire loads on the tower would lead to twist effect when the covered ice was uneven distributed.The axial forces,moments at restraint nodes and the longest cantilever member were greatly affected by the P-Δ effect,under which the unfavorable effect on the structure should be considered.
引文
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[16]GB50017-2003钢结构设计规范[S].北京:中国计划出版社.2003.
[2]LI HONG-NAN,BAI HAI-FENG.High-voltagetransmission Tower-line system subjected to disasterloads[J].Progress in Natural Science,2006,16(9):899-911.
[3]EL-GHAZALYT H A,AL-KHAIATZ H A.Analysisand design of guyed transmission towers-case study inKUWAIT[J].Computers&Structure,1998,55(3):413-431.
[4]DA SILVA J G S,DA S P C G,DE ANDRADE SAL,et al.Structural assessment of current steel designmodels for transmission and telecommunication towers[J].Journal of Constructional Steel Research.2005,61(8):1108-1134.
[5]PRASAD RAO N,KALYANARAMAN V.Non-linearbehaviour of lattice panel of angle Towers[J].Journalof Constructional Steel Research.2001,57(12):1337-1357.
[6]邓洪洲,陈晓明,屠海明,等.江阴大跨越输电塔模型试验研究[J].建筑结构学报,2001,22(12):31-35..DENG HONG-ZHOU,CHEN XIAO-MING,TUHAIMING,et al.Experimental study on model ofJiangyin long span transmission tower[J].JournalofBuilding Structures.2001,22(12):3l-35.
[7]PARK JI-HUN,MOON BYOUNG-WOOK,MINKYUNG-WON,et al.Cyclic loading test of friction-type reinforcing members upgrading wind-resistantperformance of transmission towers[J].EngineeringStructures.2007,29(11):3185-3196.
[8]ROY S,FANG S-J,ROSSOW EC.Secondary stresseson transmission tower structures[J].Journal of EnergyEngineering.1984,110(2):157-171.
[9]RONALDO C BATTISTAA,ROSANGELA SRODRIGUESA,et al.Dynamic behavior and stabilityof transmission line towers under wind forces[J].Journal of Wind Engineering and IndustrialAerodynamics.2003,91(8):1051-1067.
[10]ANTANAS KUDZYS.Safety of power transmissionline structures under wind and ice storms[J].Engineering Structures.2006,28(5):682-689.
[11]WAHBA Y M F,MADUGULA M K S,MONFORTON G R.Evaluation of non-linear analysisof guyed antenna towers[J].Computers&Structures.1998,68(1-3):207-212.
[12]胡松.大跨越输电线路的风振反应分析及振动控制研究[D].上海:同济大学土木工程学院.1999.12.
[13]李宏男,胡大柱,黄连状.地震作用下输电塔体系塑性极限状态分析[J].中国电机工程学报.2006,26(24):192-199.LI HONG-NAN,HU DA-ZHU,HUANG LIAN-ZHUANG.Plastic limit analysis of the transmissiontower system subjected to earthquake action[J].Proceedings of the CSEE.2006,26(24):192-199.
[14]梁峰,李黎,尹鹏.大跨越输电塔-线体系数值分析模型的研究[J],振动与冲击,2007,26(2):61-65.LIANG FENG,LI LI,YIN PENG.Numerical analysisof power transmission tower-line model[J].vibrationand shock,2007,26(2):61-65.
[15]SOROKINA S V,REGA G,GOULOIS A M.Onmodelling and linear vibrations of arbitrarily saggedinclined cables in a quiescent viscous fluid[J].Journalof Fluids and Structures,2007,23(7):1077-1092.
[16]GB50017-2003钢结构设计规范[S].北京:中国计划出版社.2003.
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