栓接槽钢加固技术在输电线路抗台风中的应用研究
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摘要
针对输电线路在台风气象灾害下风致倒塔事故频发的现状,以广东某220 kV输电线路为背景,建立塔线体系有限元模型.首先对塔线体系进行不同等级台风荷载作用下的动力响应分析,通过分析铁塔主材应力比沿塔高的变化,找到了台风荷载作用下铁塔的薄弱部位,利用栓接槽钢加固技术对铁塔薄弱部位进行加固,并对加固后的铁塔进行抗风能力评估和稳定性分析.分析结果表明:在强台风荷载作用下,铁塔的薄弱部位出现在塔身及塔腿区段,利用栓接槽钢对输电塔薄弱部位进行加固设计,能大幅提高原塔角钢构件的承载力和塔身结构的抗风稳定性,算例的屈曲分析表明,加固后铁塔的屈曲系数比加固前提高了一倍,并且加固后铁塔的薄弱部位转移到塔头区段.由此可见,栓接槽钢加固技术在输电线路抗台风的加固中具有良好的力学性能与应用前景.
Concerning the hurricane accident occurred frequently in transmission lines under typhoon,a finite element model of a multi-tower-line system,whitch based on typical tower structure of a 220 kV transmission line in Guangdong province,is established in this paper.Firstly,the dynamic response analysis of the couple system was done under different levels of typhoon load.And then,by analyzing the variation of the main body's stress ratio alone the tower,the weak part of the tower under the action of the typhoon load was found.Reinforce the weak parts of the tower by using bolted channel steel reinforcement technology,and evaluate the wind resistance and stability of the reinforced tower.The results indicate that the weak part of the tower under strong typhoon load appears in the tower body and foot sections.Besides,the bearing capacity of steel members and structure stability can be improved greatly by the reinforcement treatment with bolted channel steel.The buckling analysis of the example shows that the buckling coefficient of the reinforced tower is doubled than that before reinforcement,and the weak part of the reinforced tower is transferred to the tower head section.It can be seen that the bolted steel reinforcement technology has good mechanical properties and application prospects in the reinforcement of transmission lines against typhoon.
Concerning the hurricane accident occurred frequently in transmission lines under typhoon,a finite element model of a multi-tower-line system,whitch based on typical tower structure of a 220 kV transmission line in Guangdong province,is established in this paper.Firstly,the dynamic response analysis of the couple system was done under different levels of typhoon load.And then,by analyzing the variation of the main body's stress ratio alone the tower,the weak part of the tower under the action of the typhoon load was found.Reinforce the weak parts of the tower by using bolted channel steel reinforcement technology,and evaluate the wind resistance and stability of the reinforced tower.The results indicate that the weak part of the tower under strong typhoon load appears in the tower body and foot sections.Besides,the bearing capacity of steel members and structure stability can be improved greatly by the reinforcement treatment with bolted channel steel.The buckling analysis of the example shows that the buckling coefficient of the reinforced tower is doubled than that before reinforcement,and the weak part of the reinforced tower is transferred to the tower head section.It can be seen that the bolted steel reinforcement technology has good mechanical properties and application prospects in the reinforcement of transmission lines against typhoon.
引文
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[12] 鞠彦忠,李佳洋,王德弘,等.K型钢管-板节点的极限承载力研究[J].东北电力大学学报,2018,38(1):73-81.
[13] 张宏杰,杨靖波,杨风利,等.台风风场参数对输电杆塔力学特性的影响[J].中国电力,2016,49(2):41-47.
[14] 郑莹.自定义截面在ANSYS分析复杂钢架结构中的应用[J].化学工程与装备,2015,37(9):134-136.
[15] 徐冠华,黄新波,肖渊,等.覆冰输电线路铁塔非线性屈曲分析[J].广东电力,2015,28(8):93-96.
[16] 李雪,李宏男,黄连壮.高压输电线路覆冰倒塔非线性屈曲分析[J].振动与冲击,2009,28(5):111-114.
[17] 钟万里,吴灌伦,王伟,等.一种高压输电塔在风场中的失稳与加固[J].中南大学学报:自然科学版,2013,44(2):593-597.
[2] 李宏男,李雪,李钢,等.覆冰输电塔-线体系风致动力响应分析[J].防灾减灾工程学报,2008,28(2):127-134.
[3] 贺博,修娅萍,赵恒,等.强台风下高压输电线路塔-线耦联体系的力学行为仿真分析二:动力响应分析[J].高压电器,2016,52(4):42-47.
[4] 楼文娟,夏亮,蒋莹,等.B类风场与台风风场下输电塔的风振响应和风振系数[J].振动与冲击,2013,32(6):13-17.
[5] 黄国胜,刘树堂,韩林田.基于石沅台风谱的输电塔风场数值模拟[J].华南地震,2014,34(S1):71-75.
[6] 安利强,张志强,黄仁谋,等.台风作用下输电塔线体系动力响应分析[J].振动与冲击,2017,36(23):255-262.
[7] 贺博,修娅萍,赵恒,等.强台风下高压输电线路塔-线耦联体系的力学行为仿真分析一:静力响应分析[J].高压电器,2016,52(4):36-41.
[8] 刘文洋,张文福.三维空间相关风场的计算机模拟及Matlab程序实现[J].空间结构,2008,14(2):14-17.
[9] GB50545-2010.110～750kV架空输电线路设计技术规范[S].北京:中国计划出版社,2010.
[10] 刘春城,龙祖良,查传明,等.考虑土-结构相互作用的输电塔风振系数计算[J].东北电力大学学报,2018,38(2):59-63.
[11] 张冰.台风作用下特高压输电铁塔动态响应分析[D].北京:华北电力大学,2014.
[12] 鞠彦忠,李佳洋,王德弘,等.K型钢管-板节点的极限承载力研究[J].东北电力大学学报,2018,38(1):73-81.
[13] 张宏杰,杨靖波,杨风利,等.台风风场参数对输电杆塔力学特性的影响[J].中国电力,2016,49(2):41-47.
[14] 郑莹.自定义截面在ANSYS分析复杂钢架结构中的应用[J].化学工程与装备,2015,37(9):134-136.
[15] 徐冠华,黄新波,肖渊,等.覆冰输电线路铁塔非线性屈曲分析[J].广东电力,2015,28(8):93-96.
[16] 李雪,李宏男,黄连壮.高压输电线路覆冰倒塔非线性屈曲分析[J].振动与冲击,2009,28(5):111-114.
[17] 钟万里,吴灌伦,王伟,等.一种高压输电塔在风场中的失稳与加固[J].中南大学学报:自然科学版,2013,44(2):593-597.