多点激励下输电塔-导线体系纵向地震反应分析
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摘要
基于所建立的输电塔-导线体系空间有限元模型,利用非线性时程分析法研究了体系在多点地震输入下的反应特性。首先依据《电力设施抗震设计规范》,在传统的谐波叠加合成算法的基础上,给出了拟合规范反应谱的输电塔-导线体系多点地震动模拟算法。利用生成的人造地震动研究了行波效应、部分相干效应以及局部场地土效应对体系的影响规律,研究结果表明,在所考虑的行波波速下,行波效应对塔的受力有利,但放大了导线的轴力和位移响应;部分相干效应对于塔的受力、导线的轴力和位移响应均不利;局部场地土条件的差异同样会放大塔和导线的响应,随着各塔场地土条件差异变大,响应被强烈的放大了;在实际分析中,应该综合考虑三个因素对结构地震响应的影响,以保证结构体系的安全。
Based on the model of a power transmission tower-cable system established,the influence of spatially ground motion on the longitudinal seismic response of the system is studied using nonlinear time history analysis.First,an artificial earthquake motion being compatible with the code response spectrum is generated using harmonic wave superimposing method.Structural seismic responses are compared under non-uniform excitation considering wave passage effect,incoherence effect and local site effect.The results indicate that wave passage effect is favorable for the internal forces of the tower,and increases the cable axis forces,longitudinal and vertical displacements of the cables;incoherence effect is unfavorable for both the tower and the cables;the bigger the local site differences among the tower bases,the larger the detrimental effect.Therefore,the three factors should be properly considered in the seismic response analysis in order to guarantee the safety of the tower-cable system.
Based on the model of a power transmission tower-cable system established,the influence of spatially ground motion on the longitudinal seismic response of the system is studied using nonlinear time history analysis.First,an artificial earthquake motion being compatible with the code response spectrum is generated using harmonic wave superimposing method.Structural seismic responses are compared under non-uniform excitation considering wave passage effect,incoherence effect and local site effect.The results indicate that wave passage effect is favorable for the internal forces of the tower,and increases the cable axis forces,longitudinal and vertical displacements of the cables;incoherence effect is unfavorable for both the tower and the cables;the bigger the local site differences among the tower bases,the larger the detrimental effect.Therefore,the three factors should be properly considered in the seismic response analysis in order to guarantee the safety of the tower-cable system.
引文
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[14]Trujillo D M.Anewapproach to the integration of accelerom-eter data[J].Earthquake Engineering and Structural Dynam-ics,1982,10:529—535.
[15]岳茂光,王东升,李宏男,等.近断层地震动作用下输电塔-导线体系反应分析[J].地震工程与工程振动,2005,25(4):116—125.
[2]全伟,李宏男.大跨结构多维多点输入抗震研究进展[J].防灾减灾工程学报,2006,26(3):343—351.
[3]范立础,王君杰,陈玮.非一致地震激励下大跨度斜拉桥的响应特征[J].计算力学学报,2001,18(3):358—363.
[4]亓兴军,李小军,申永刚.地震行波输入下大跨连续刚构桥梁半主动控制效应分析[J].振动与冲击,2007,26(2):117—120.
[5]董贺勋,叶继红.多点输入下大跨空间网格结构的可靠度分析[J].振动与冲击,2007,25(3):131—137.
[6]江宜城,杨德喜,李黎,等.LRB隔震桥梁空间变异性地震随机响应分析[J].振动与冲击,2007,26(1):104—107.
[7]Ghobarah A,Aziz TS,El-Attar M.Response of transmissionlines to multiple support excitation[J].Engineering Struc-tures,1996,18(12):936—946.
[8]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.
[9]Hao H,Oliveira C S,Penzien J.Multiple station ground mo-tion processing and simulation based on SMART-1 array data[J].Nuclear Engineering and Design,1989,111:293—310.
[10]Shama A A.Simplified procedure for simulating spatially cor-related earthquake ground motions[J].Engineering Struc-tures,2007,29:248—258.
[11]董汝博,周晶,冯新.一种考虑局部场地收敛性的多点地震动合成方法[J].振动与冲击,2007,13(1):28—34.
[12]中华人民共和国国家标准.电力设施抗震设计规范(GB50260-96).北京:中国计划出版社,1997.
[13]李建波,陈健云,林皋.相互作用分析中地震动输入长周期校正研究[J].大连理工大学学报,2004,44(4):550—555.
[14]Trujillo D M.Anewapproach to the integration of accelerom-eter data[J].Earthquake Engineering and Structural Dynam-ics,1982,10:529—535.
[15]岳茂光,王东升,李宏男,等.近断层地震动作用下输电塔-导线体系反应分析[J].地震工程与工程振动,2005,25(4):116—125.
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