大跨越钢管混凝土输电塔线体系的地震响应分析
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摘要
建立一个大跨越钢管混凝土输电线路的单塔和塔线体系有限元模型,对这两种模型进行地震响应分析。首先,利用振型分解反应谱法分析两种模型在地震作用下的响应;然后,选取两条实际地震波和一条人工波,利用时程分析法获得两种模型在三种地震波作用下的响应。计算表明:塔线体系的固有频率与单塔相比变化很小;由于输电线的减振作用,塔线模型的底部剪力和一些单元的应力比单塔模型的有所减小;由功率谱法指出结构的一阶模态对结构的地震响应起决定性作用;时程法得到的结构底部剪力均不小于反应谱法的80%,说明所选的这组地震波是合适的。反应谱法与时程分析法计算的结果具有较好的可比性,说明采用的计算方法、过程和结果是有效的。
FEM models of a single concrete filled steel-tube tower and a long-span transmission tower-line system were established to analyze the seismic responses.The seismic behaviors of the two models were studied first by using mode-decomposition response spectrum method.Then,two seismic records and an artificial seismic wave were selected to analyze the seismic behaviors of the two models by using time-history analysis method.The results indicated: ①the natural frequencies of the tower-line system were very similar to those of the single tower;②the tower-line system developed smaller axial stresses in some members and smaller shear forces on supports than the single tower because of the wires acting as a tuned mass damper;③the power spectrum analysis revealed that the seismic responses of the structure were mostly dominated by the structural first-order mode;④the seismic results obtained from the response spectrum method and time-history analysis method were in good agreement.
FEM models of a single concrete filled steel-tube tower and a long-span transmission tower-line system were established to analyze the seismic responses.The seismic behaviors of the two models were studied first by using mode-decomposition response spectrum method.Then,two seismic records and an artificial seismic wave were selected to analyze the seismic behaviors of the two models by using time-history analysis method.The results indicated: ①the natural frequencies of the tower-line system were very similar to those of the single tower;②the tower-line system developed smaller axial stresses in some members and smaller shear forces on supports than the single tower because of the wires acting as a tuned mass damper;③the power spectrum analysis revealed that the seismic responses of the structure were mostly dominated by the structural first-order mode;④the seismic results obtained from the response spectrum method and time-history analysis method were in good agreement.
引文
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[3]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(Li Hongnan,Shi Wenlong,JiaLianguang.Limitations of effects of lines on in-planevibration of transmission towers and simplified seismiccalculation method[J].Journal of Vibration and Shock,2004,23(2):1-8(in Chinese))
[4]Li Hongnan,Shi Wenlong,Wang Guoxin,et al.Simplifiedmodels and experimental verification for coupled transmissiontower-line system to seismic excitations[J].Journal of Soundand Vibration,2005,286(3):569-585
[5]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(Qu Weilian,Yin Huijun,Chen Bo.Study on mulit-degree-of-freedom model of transmission tower-line system[J].Journal of Huazhong University of Science andTechnology,2003,20(2):1-5(in Chinese))
[6]傅鹏程,邓洪洲,吴静.输电塔结构的动力特性研究[J].特种结构,2005,22(1):47-49(Fu Pengcheng,Deng Hongzhou,Wu Jing.Research on dynamic charactersof electrical transmission tower[J].Special Structures,2005,22(1):47-49(in Chinese))
[7]曹枚根,周福霖,徐忠根.钢管组合大跨越输电塔线体系简化模型研究[J].钢结构,2005,20(6):27-32(Cao Meigen,Zhou Fulin,Xu Zhonggen.Simplified modelresearch of combo steel tube tower for large crossingtransmission lines[J].Steel Structures,2005,20(6):27-32(in Chinese))
[8]Yasui H,Murukawa H,Momomura Y.Analytical study onwind-induced vibration of power transmission towers[J].Journal of Wind Engineering and Industrial Aerodynamic,1999,83(1/2/3):431-441
[9]Albermani F G A,Kitipornchai S.Numerical simulation ofstructural behavior of transmission towers[J].Thin-WalledStructure,2003,41(2/3):167-177
[10]沈国辉,孙炳楠,何运祥,等.大跨越输电塔线体系的地震响应研究[J].工程力学,2008,25(11):212-217(Shen Guohui,Sun Bingnan,He Yunxiang,et al.Seismicresponses of long-span transmission tower-line system[J].Engineering Mechanics,2008,25(11):212-217(inChinese))
[11]杨溥,李英民,赖明.结构时程分析法输入地震波的选择控制指标[J].土木工程学报,2000,33(6):33-37(Yang Pu,Li Yingmin,Lai Ming.A new method forselecting inputing waves for time-history analysis[J].China Civil Engineering Journal,2000,33(6):33-37(inChinese))
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