基于时程分析法分析500kV长短腿猫头直线塔的地震反应
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摘要
采用ANSYS有限元分析软件和数学软件Matlab,通过对等长腿铁塔和6 m塔腿高差长短腿铁塔在地震作用下的反应进行分析得出:长短腿铁塔的整体刚度较等长腿铁塔大;在受动力作用时,长短腿铁塔的短腿支座、短腿一侧塔头附近的主弦杆为薄弱环节;长短腿铁塔容易在塔腿部位形成局部扭转振型,对整个铁塔特别是对支座反力和塔腿附近杆件内力产生了很大的影响。
Based on the finite element software ANSYS and Matlab,the estimating seismic responses of 500 kV transmission towers with unequal legs by time-history method have been analysed,and the conclusion has been made as follow:the structural global stiffness related with transmission towers with unequal legs is larger than that related with transmission towers with equal legs,so,the transmission towers with unequal legs will be the priority in the process of transmission tower design,in the mountainous region;under the same dynamical load and compared with transmission towers with equal legs,among the components of the transmission tower with unequal legs,the surport of the short legs and the poles lacated in the section of towertip would be the weakness which should be paid more attention;the adversity of the transmission tower with unequal legs is the formation of lacal tortional vibration mode,which would place a significant effect on the reaction force and the axial force of the poles lacated in the section of transmission tower legs.
Based on the finite element software ANSYS and Matlab,the estimating seismic responses of 500 kV transmission towers with unequal legs by time-history method have been analysed,and the conclusion has been made as follow:the structural global stiffness related with transmission towers with unequal legs is larger than that related with transmission towers with equal legs,so,the transmission towers with unequal legs will be the priority in the process of transmission tower design,in the mountainous region;under the same dynamical load and compared with transmission towers with equal legs,among the components of the transmission tower with unequal legs,the surport of the short legs and the poles lacated in the section of towertip would be the weakness which should be paid more attention;the adversity of the transmission tower with unequal legs is the formation of lacal tortional vibration mode,which would place a significant effect on the reaction force and the axial force of the poles lacated in the section of transmission tower legs.
引文
[1]王东升,冯启民,翟桐.近断层地震动作用下钢筋混凝土桥墩的抗震性能[J].地震工程与工程振动,2003,23(1):95-102.
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[3]DL/T5092-1999 110～500 kV架空送电线路设计技术规程[S].
[4]GB 50260-96电力设施抗震设计规范[S].
[5]岳茂光,李宏男,王东升,翟桐.行波激励下输电塔—导线体系纵向地震反应分析[J].中国电机工程学报,2006,26(23).
[6]李宏男,白海峰.高压输电塔—线体系抗灾研究的现状与发展趋势[J].土木工程学报,2007,40(2).
[7]李宏男,石文龙,贾连光.考虑导线影响的输电塔侧向简化抗震计算方法[J].振动工程学报,2003,16(2):101-105.
[8]Harikrishna P,Shanmugasundaram J,et al.Analytical and experi-mental studies on the gust response of a 52m tall steel lattice towerunder wind loading[J].Comput.&struct.,1999,70:149-160.
[9]何敏娟,杨必峰.江阴500 kV拉线式输电塔脉动实测[J].结构工程,2003(3):76-81.
[10]虞终军,马人乐,徐荣璞.大跨度钢塔的多点地震输入反应[J].特种结构,1999(4):1-3.
[2]尹荣华,李东亮,刘戈林,等.高压输电塔震害及抗震研究[J].世界地震工程,2005,23(1).
[3]DL/T5092-1999 110～500 kV架空送电线路设计技术规程[S].
[4]GB 50260-96电力设施抗震设计规范[S].
[5]岳茂光,李宏男,王东升,翟桐.行波激励下输电塔—导线体系纵向地震反应分析[J].中国电机工程学报,2006,26(23).
[6]李宏男,白海峰.高压输电塔—线体系抗灾研究的现状与发展趋势[J].土木工程学报,2007,40(2).
[7]李宏男,石文龙,贾连光.考虑导线影响的输电塔侧向简化抗震计算方法[J].振动工程学报,2003,16(2):101-105.
[8]Harikrishna P,Shanmugasundaram J,et al.Analytical and experi-mental studies on the gust response of a 52m tall steel lattice towerunder wind loading[J].Comput.&struct.,1999,70:149-160.
[9]何敏娟,杨必峰.江阴500 kV拉线式输电塔脉动实测[J].结构工程,2003(3):76-81.
[10]虞终军,马人乐,徐荣璞.大跨度钢塔的多点地震输入反应[J].特种结构,1999(4):1-3.
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