地震动多点激励下输电塔线的反应分析
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摘要
以5A-ZM2塔为基础建立输电塔线体系有限元模型,以考虑行波效应、部分相干效应和局部场地效应的人工合成地震动为输入,得到输电塔线体系在多点激励作用下的塔顶加速度时程曲线、塔顶位移时程曲线、主材单元内力时程曲线、斜材单元内力时程曲线,并与相应的一致激励作用下的地震反应结果进行比较。结果表明,仅考虑行波效应时,多点激励会比较明显的放大输电塔线体系的地震反应,对结构不利;考虑部分相干效应和局部场地效应时,多点激励可能放大,也可能减小输电塔线体系的地震反应,但其影响程度远小于行波效应;综合考虑行波效应、部分相干效应和局部场地效应时,多点激励会对输电塔线体系地震反应造成较大影响,且这些影响对结构不利。
The finite element model of multi-tower-line coupled system is established,which is based on the 500kV 5AZM2 transmission tower. Spatially variable ground motion time histories which consider traveling-wave effect,coherent effect and site effect are simulated. The responses of the transmission line system under uniform excitation and multiple support excitations are studied by using the time history analysis method. The results of seismic response,which include the time-history response curve of acceleration and displacement at tower top,the time-history response curve of internal force of main member and diagonal member are showed,and are compared with the results under uniform excitations.The results show that while considering traveling-wave effect,multi-support excitations obviously amplify the seismic response of the tower; while considering coherent effect and site effect,multi-support excitations slightly amplify or decrease seismic response of the tower; while considering traveling-wave effect,coherent effect and site effect,multisupport excitations will mainly amplify the seismic response of the tower.
The finite element model of multi-tower-line coupled system is established,which is based on the 500kV 5AZM2 transmission tower. Spatially variable ground motion time histories which consider traveling-wave effect,coherent effect and site effect are simulated. The responses of the transmission line system under uniform excitation and multiple support excitations are studied by using the time history analysis method. The results of seismic response,which include the time-history response curve of acceleration and displacement at tower top,the time-history response curve of internal force of main member and diagonal member are showed,and are compared with the results under uniform excitations.The results show that while considering traveling-wave effect,multi-support excitations obviously amplify the seismic response of the tower; while considering coherent effect and site effect,multi-support excitations slightly amplify or decrease seismic response of the tower; while considering traveling-wave effect,coherent effect and site effect,multisupport excitations will mainly amplify the seismic response of the tower.
引文
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[4]白凤龙,李宏男.地震动多点激励下大跨空间网架结构的反应分析[J].工程力学,2010,27(7):67-73(Bai Fenglong,Li Hongnan.Seismic response analysis of transmission line systems under multi-support excitations[J].Engineering Mechanics,2010,27(7):67-73(in Chinese))
[5]戴鸿哲,王伟,袁平,等.输电塔塔-线体系动力特性[J].哈尔滨工业大学学报,2008,40(12):1906-1909(Dai Hongzhe,Wang Wei,Yuan Ping,et al.Dynamic behavior analysis of transmission line system[J].Journal of Harbin Institute of Technology,2008,40(12):1906-1909(in Chinese))
[6]刘振亚.国家电网公司输变电工程典型设计-500kV输电线路分册[M].北京:中国电力出版社,2005:44-47
[7]Hong Hao.Arch response to correlated multiple excitations[J].Earthquake Engineering and Structure Dynamics,1993,22(5):389-404
[8]Clough R W,Penzien J.Dynamics of structures[M].2nd edition.New York:McGraw-Hill,1993
[9]Amin M,Ang A H S.Nonstationary stochastic model of earthquake motions[J].Journal of Engineering Mechanics,1968,94(2):213-228
[10]赵灿辉.大跨度桥梁地震响应分析中的非一致地震激励模型[J].西南交通大学学报,2002,37(3):236-240(Zhao Canhui.Seismic response analysis of long-span bridges[J].Journal of Southwest Jiaotong University,2002,37(3):236-240(in Chinese))
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