多点地震激励下考虑地形变化输电塔线体系的响应分析
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摘要
分别建立了中塔位于谷地和峰顶的输电塔线耦联体系三维空间有限元模型,模拟生成考虑地形变化场地上的多点地震动,运用非线性动力时程分析方法,进行多点地震激励下地形变化输电塔线体系的地震响应数值模拟.考虑多点地震动中的行波效应、部分相干效应和局部场地效应.分析多点地震动中行波效应和局部场地效应对结构地震响应的影响,并将计算结果与一致激励下的结果进行对比.研究结果表明,无论输电塔位于峰顶还是谷底,受行波波速的影响很大,但两种模型受行波波速的影响程度不同,忽略行波效应可能低估体系的地震响应;随着场地条件差异变大,结构的地震响应变大,对于输电塔位于峰顶的响应放大程度要大于输电塔位于谷底,因此应该考虑局部场地效应的影响.
Three-dimensional finite element models of transmission tower-line coupled system which the middle transmission towers are located at the summit and valley floor were established,respectively.Multi-support ground motions considering topographic variation site were simulated.Using nonlinear dynamic time history analysis method,seismic responses of the transmission tower-line system considering topographic variation site under multi-support excitations were carried out.Wave passage effect,coherency loss effect and different local site effect of multi-support ground motions were considered.Compared with the structural response under uniform excitation,the responses considering wave passage effect and local site effect of multi-support ground motion were analyzed,respectively.The results showed that the traveling wave velocity had a significant effect on the models that the middle transmission towers are located at the summit and valley floor,but the degrees of the effect were different for two models.Neglecting the wave passage effect could underestimate the seismic response of the system.The larger are the difference between the site conditions,the larger are the responses of the structure.The responses of the middle transmission tower located at the summit are larger than that located at valley floor.Therefore,the influence of the local site effect should be considered.
Three-dimensional finite element models of transmission tower-line coupled system which the middle transmission towers are located at the summit and valley floor were established,respectively.Multi-support ground motions considering topographic variation site were simulated.Using nonlinear dynamic time history analysis method,seismic responses of the transmission tower-line system considering topographic variation site under multi-support excitations were carried out.Wave passage effect,coherency loss effect and different local site effect of multi-support ground motions were considered.Compared with the structural response under uniform excitation,the responses considering wave passage effect and local site effect of multi-support ground motion were analyzed,respectively.The results showed that the traveling wave velocity had a significant effect on the models that the middle transmission towers are located at the summit and valley floor,but the degrees of the effect were different for two models.Neglecting the wave passage effect could underestimate the seismic response of the system.The larger are the difference between the site conditions,the larger are the responses of the structure.The responses of the middle transmission tower located at the summit are larger than that located at valley floor.Therefore,the influence of the local site effect should be considered.
引文
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[15]Bi K M,Hao H,Nawawi C.Required separation distance between decks and at abutments of a bridge crossing a canyonsite to avid seismic pounding[J].Earthquake Engineering and Structural Dynamics,2009,39(3):303-323
[16]田利,李宏男.基于《电力设施抗震设计规范》的地震动随机模型参数研究[J].防灾减灾工程学报,2010,30(1):17-22Tian Li,Li Hongnan.Parameter study on seismic random model based on code for design of seismic of electricalinstallations[J].Journal of Disaster Prevention and Mitigation Engineering,2010,30(1):17-22
[17]丁海平,刘启方,金星,等.基岩地震动的一个相干函数模型-倾滑断层情形[J].地震工程与工程振动,2003,23(2):8-11Ding Haiping,Liu Qifang,Jin Xing,et al.A coherency model of ground motion on base-rock corresponding to dip-slipfault[J].Earthquake Engineering and Engineering Vibration,2003,23(2):8-11
[18]丁海平,刘启方,金星,等.基岩地震动的一个相干函数模型-走滑断层情形[J].地震学报,2004,26(1):62-67Ding Haiping,Liu Qifang,Jin Xing,et al.A coherency fuction model of ground motion at base rock corresponding tostrike-slip fault[J].Acta Seismologica Sinica,2004,26(1):62-67
[19]梁树霞.地震小区划方法的综合比较[D].大连:大连理工大学硕士学位论文,2009Liang Shuxia.Comprehensive comparison of seismic microzonation methods[D].Dalian:Dalian University ofTechnology,Master’s Degree Thesis,2009
[2]王蕾,赵成刚,王智峰.考虑地形影响和多点激励的大跨高墩桥地震响应分析[J].土木工程学报,2006,39(1):50-59.Wang Lei,Zhao Chenggang,Wang Zhifeng.Seismic response analysis of continuous rigid-framed bridge piersconsidering topographic effects and multi-support excitations[J].China Civil Engineering Journal,2006,39(1):50-59
[3]肖文海.大型河谷场地地震动特征研究[D].北京:中国地震局工程力学研究所硕士学位论文,2009Xiao Wenhai.Research on ground motion characteristics at the site of large-scale valley[D].Beijing:Institute ofEngineering Mechanics,China Earthquake Administration,Master’s Degree Thesis,2009
[4]王光远,程耿东,邵卓民,等.抗震结构的最优设防烈度与可靠度[M].北京:科学出版社,1999Wang Guangyuan,Cheng Gengdong,Shao Zhuomin,et al.Optimal fortification intensity and reliability of aseismicstructures[M].Beijing:Scientific Press,1999
[5]首培杰,刘曾武,朱镜清.地震波在工程中的应用[M].北京:地震出版社,1982Sou Peijie,Liu Zengwu,Zhu Jingqing.Application of earthquake wave in engineering[M].Beijing:Seismological Press,1982
[6]刘必灯.考虑地形影响的多点输入下大跨桥梁地震反应及碰撞反应分析[D].北京:中国地震局工程力学研究所硕士学位论文,2008Liu Bideng.Seismic responses and collision responses analysis of long-span bridges for multi-supported excitations andtopographic effects[D].Institute of Engineering Mechanics,China Earthquake Administration,Master’s Degree Thesis,2008
[7]刘洪兵,朱晞.地震中地形放大效应的观测和研究进展[J].世界地震工程,1999,15(3):20-25Liu Hongbing,Zhu Xi.Advance on topographic amplification effects of seismic response[J].World Information onEarthquake Engineering,1999,15(3):20-25
[8]刘如山,张美晶,邬玉斌,等.汶川地震四川电网震害及功能失效研究[J].应用基础与工程科学学报,2010,18:200-211Liu Rushan,Zhang Meijing,Wu Yubin,et al.Damage and failure study of Sichuan electric power grid in Wenchuanearthquake[J].Journal of Basic and Engineering,2010,18:200-211
[9]李宏男.结构多维抗震理论[M].北京:科学出版社,2006Li Hongnan.Theoretical analysis of structures to multiple earthquake excitations[M].Beijing:Scientific Press,2006
[10]GB50260-96,电力设施抗震设计规范[S].北京:中国计划出版社,1996GB 50260-96,Code for design of seismic of electrical installations[S].Beijing:China Plan Press,1996
[11]邓洪洲,陈晓明,屠海明,等.江阴大跨越输电塔模型实验研究[J].建筑结构学报,2001,22(6):31-35Deng Hongzhou,Chen Xiaoming,Tu Haiming,et al.Experimental study on model of Jiangyin long span transmissiontower[J].Journal of Building Structures,2001,22(6):31-35
[12]沈世钊,徐崇宝,赵臣.悬索结构设计[M].北京:中国建筑工业出版社,1997Shen Shizhao,Xu Chongbao,Zhao Chen.Design of suspension structure[M],Beijing:China Architecture and BuildingPress,1997
[13]Hao H,Nawawi C.Spatial ground motion variation site amplification effects[C].Proceedings of a Conference Held bythe Australian Earthquake Engineering Society,Albury,2005
[14]Bi K M,Hao H.Simulation of spatially varying ground motions with non-uniform intensities and frequency content[C].Proceedings of a Conference Held by the Australian Earthquake Engineering Society,Ballarat,2008
[15]Bi K M,Hao H,Nawawi C.Required separation distance between decks and at abutments of a bridge crossing a canyonsite to avid seismic pounding[J].Earthquake Engineering and Structural Dynamics,2009,39(3):303-323
[16]田利,李宏男.基于《电力设施抗震设计规范》的地震动随机模型参数研究[J].防灾减灾工程学报,2010,30(1):17-22Tian Li,Li Hongnan.Parameter study on seismic random model based on code for design of seismic of electricalinstallations[J].Journal of Disaster Prevention and Mitigation Engineering,2010,30(1):17-22
[17]丁海平,刘启方,金星,等.基岩地震动的一个相干函数模型-倾滑断层情形[J].地震工程与工程振动,2003,23(2):8-11Ding Haiping,Liu Qifang,Jin Xing,et al.A coherency model of ground motion on base-rock corresponding to dip-slipfault[J].Earthquake Engineering and Engineering Vibration,2003,23(2):8-11
[18]丁海平,刘启方,金星,等.基岩地震动的一个相干函数模型-走滑断层情形[J].地震学报,2004,26(1):62-67Ding Haiping,Liu Qifang,Jin Xing,et al.A coherency fuction model of ground motion at base rock corresponding tostrike-slip fault[J].Acta Seismologica Sinica,2004,26(1):62-67
[19]梁树霞.地震小区划方法的综合比较[D].大连:大连理工大学硕士学位论文,2009Liang Shuxia.Comprehensive comparison of seismic microzonation methods[D].Dalian:Dalian University ofTechnology,Master’s Degree Thesis,2009
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