行波效应对大跨越输电塔-线体系纵向地震响应影响
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摘要
由于特高压大跨越输电塔-线体系塔身高跨度大,仅考虑单塔及塔-线体系的一致地震输入是远远不够的。考虑地震波沿大跨越线路传播时引起的地震行波效应,建立了特高压大跨越输电塔-线体系精细的三维空间有限元模型,运用几何非线性动力时程分析方法,研究了纵向地震作用下大跨越输电塔-线体系的地震响应特性,并和一致地震动输入下的反应进行了对比。结果表明:行波效应既可以增加又可以减小塔身的地震响应,主要与地震动作用于大跨越两端输电塔的相位差有关;行波效应对导线跨中竖向位移响应影响十分明显,对导线内力响应影响很小。
Because of high tower and long-span of a ultra-high voltage long-span transmission tower-cable system,it is not enough only to consider seismic responses of the system under the uniform excitation.Based on the established precise 3D finite element model of the ultra-high voltage long-span transmission tower-cable system,the longitudinal seismic responses characteristics of the system were studied under traveling wave excitation and compared with those under uniform excitation using the geometric nonlinear dynamic time history integration method.The results showed that the traveling wave excitation can increase,or decrease the seismic responses of the transmission tower,which is mainly related to the phase difference;the effect of traveling wave on the line's displacement responses is obvious in the vertical direction,but its effect on the line's axial force is not significant.
Because of high tower and long-span of a ultra-high voltage long-span transmission tower-cable system,it is not enough only to consider seismic responses of the system under the uniform excitation.Based on the established precise 3D finite element model of the ultra-high voltage long-span transmission tower-cable system,the longitudinal seismic responses characteristics of the system were studied under traveling wave excitation and compared with those under uniform excitation using the geometric nonlinear dynamic time history integration method.The results showed that the traveling wave excitation can increase,or decrease the seismic responses of the transmission tower,which is mainly related to the phase difference;the effect of traveling wave on the line's displacement responses is obvious in the vertical direction,but its effect on the line's axial force is not significant.
引文
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[11]田利,李宏男,黄连壮.多点激励下输电塔–线体系的侧向地震反应分析[J].中国电机工程学报,2008,28(16):108-144.
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[15]邹天晓.架空送电线路的电线力学计算[M].北京:水利电力出版社,1987.
[2]屈靖,郭剑波.“九五”期间我国电网稳定事故统计分析[J].电网技术,2004,28(21):60-62,68.
[3]谢强,李杰.电力系统自然灾害的现状与对策[J].自然灾害学报,2006,15(4):126-131.
[4]李宏男,陆鸣,王前信.大跨越自立式高压输电塔-电缆体系的简化抗震计算[J].地震工程与工程振动,1990,10(2):73-87.
[5]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):233-237.
[6]岳茂光,王东升,李宏男,等.近断层地震动作用下输电塔一导线体系反应分析[J].地震工程与工程振动,2005,25(4):116-125.
[7]屈铁军,王前信.多点输入地震反应分析研究的进展[J].世界地震工程,1993(1):30-36.
[8]潘旦光,楼梦麟,范立础.多点输入下大跨度结构地震反应分析研究现状[J].同济大学学报,2001,29(10):1213-1219.
[9]Ghobarah A,Aziz T S,El-AttarM.Response of transmissionlines to multiple support excitation[J].EngineeringStructures,1996,18(12):936-946.
[10]岳茂光,李宏男,王东升,等.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):145-150.
[11]田利,李宏男,黄连壮.多点激励下输电塔–线体系的侧向地震反应分析[J].中国电机工程学报,2008,28(16):108-144.
[12]全伟,李宏男,岳茂光.多点激励下输电塔-导线体系纵向地震反应分析[J].振动与冲击,2008,27(10):75-80.
[13]Wilson E L.Three dimensional static and dynamic analysis ofstructures:a physical app roach with emphasis on earthquakeengineering[M].Computers and Structures,Inc,Berkley,California,2002.
[14]张殿生.电力工程高压送电线路设计手册[M].北京:中国电力出版社,2005.
[15]邹天晓.架空送电线路的电线力学计算[M].北京:水利电力出版社,1987.
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