竖向多点激励下输电塔线体系导(地)线及绝缘子动力响应分析
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摘要
考虑地震波以有限波速传播时所引起的地震行波效应及场地相干效应,基于建立的某大跨输电塔线体系空间有限元模型,在7度竖向地震作用下,采用考虑几何非线性的动力时程分析法,研究了该体系在竖向多点地震作用下的动力时程响应特性,并和一致激励下的响应情况进行比较。结果表明:竖向地震能明显增大绝缘子的内力,但对导线内力影响不大;多点激励对导地线及绝缘子的内力响应影响都很小,基本可以忽略。
Considering the effect of spatial variation of earthquake ground motion,based on the established finite element model of the lager-span transmission tower-line system,the vertical seismic responses of the systems are studied,which are analyzed by using the dynamic time history integration method under multi-support excitations considering the geometric nonlinearity.The seismic responses of the conductor and insulator are acquired under uniform and multi-support excitations.The results show that the vertical earthquake obviously increase the axial force of the insulators although the effects of vertical earthquake on conductor are slight,and the effects of spatial variation of earthquake on axial force of the conductors and insulators are slight and can be ignored.
Considering the effect of spatial variation of earthquake ground motion,based on the established finite element model of the lager-span transmission tower-line system,the vertical seismic responses of the systems are studied,which are analyzed by using the dynamic time history integration method under multi-support excitations considering the geometric nonlinearity.The seismic responses of the conductor and insulator are acquired under uniform and multi-support excitations.The results show that the vertical earthquake obviously increase the axial force of the insulators although the effects of vertical earthquake on conductor are slight,and the effects of spatial variation of earthquake on axial force of the conductors and insulators are slight and can be ignored.
引文
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[2]李宏男,石文龙,贾连光.导线对输电塔体系纵向振动大的影响界限及简化抗震计算方法[J].振动与冲击,2004,23(2):1-8.
[3]Li Hongnan,Shi Wenlong,Wang Guoxin,Jia Lian guang.Simpli-fied models and experimental verification for coupled transmissiontower-line system to seismic excitations[J].Journal of Sound andVibration,2005,286:569-585.
[4]瞿伟廉,殷惠君,陈波.输电线路动力分析的多质点模型研究[J].华中科技大学学报,2003,20(2):1-5.
[5]田利,李宏男.地震动差动下高压输电塔-线体系的纵向反应[J].地震工程与工程震动,2008,28(1):117-122.
[6]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.
[7]Hao H,Oliveira C S,Penzien J.Multiple-station ground motion pro-cessing and simulation based on SMART-1 array data[J].NuclearEngineering Design,1989,111:293-310.
[8]George Deodatis.Simulation of ergodic of multi variate stochasticprocesses[J].Journal of Engineering Mechanics,1996,122:778-781.
[9]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004:136-139.
[10]丁阳,林伟,李忠献.大跨度空间结构多维多点非平稳随机地震反应分析[J].工程力学,2007,24(3):97-103.
[11]屈铁军,王君杰,王前信.空间变化的地震动功率谱的实用模型[J].地震学报,1996,18(1):55-62.
[12]薛素铎,王雪生,曹资.基于新抗震规范的地震动随机模型参数研究[J].土木工程学报,2003,36(5):5-10.
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