大跨桥梁非一致激励地震响应分析(英文)
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摘要
目前一致激励被广泛应用于工程结构的地震响应分析中,但对于跨度和支点距离较大的大跨桥梁,非一致激励效应的影响越发明显,有必要针对悬索桥和斜拉桥等大跨桥梁进行非一致地震激励响应研究。以一座大跨度斜拉桥为例,考虑行波效应、部分相干效应和局部场地效应,对非一致激励对大跨桥梁地震响应的影响进行了分析。研究结果表明一致激励并不能控制大跨桥梁的地震设计,非一致激励的影响明显,应在同类桥梁的抗震分析中予以计入。
Currently,the method under uniform seismic excitation is widely applied in earthquake response analysis of practical projects.However,for the long-span bridge,large distance of supports and long extension makes non-uniform seismic excitations effect become very distinct.Consequently,seismic response research under non-uniform excitation of random earthquake ground motion is necessary for anti-seismic design of long-span bridge.Seismic response analysis of a long-span cable-stayed bridge is simulated under random seismic excitations in stochastic method in this study.Traveling wave effect,partial coherence effect and local site effect are considered in the study.The result indicates that uniform seismic excitation does not control the seismic design of long-span bridge and the influence of traveling wave excitation and multi-support excitation of random earthquake ground motion on the seismic responses must be considered.
Currently,the method under uniform seismic excitation is widely applied in earthquake response analysis of practical projects.However,for the long-span bridge,large distance of supports and long extension makes non-uniform seismic excitations effect become very distinct.Consequently,seismic response research under non-uniform excitation of random earthquake ground motion is necessary for anti-seismic design of long-span bridge.Seismic response analysis of a long-span cable-stayed bridge is simulated under random seismic excitations in stochastic method in this study.Traveling wave effect,partial coherence effect and local site effect are considered in the study.The result indicates that uniform seismic excitation does not control the seismic design of long-span bridge and the influence of traveling wave excitation and multi-support excitation of random earthquake ground motion on the seismic responses must be considered.
引文
[1]Xiang Haifan.Earthquake response analysis of cable-stayed bridges under the action of traveling waves[J].Journal of Tongji University,1983,19(2):23-28.
[2]Fan Lichu,Yuan Wancheng,Hu Shide.Longitudinal seismic response analysis for Shanghai Nanpu Bridge[J].China Civil Engineering Journal,1992,25(3):2-8.
[3]Nazmy A S,Abdel G A M.Effects of ground motion spatial variability on the response of cable-stayed bridges[J].Earthquake Engineering andStructural Dynamics,1992,21(1):1-20.
[4]Chen Youping,Zhou Hongye.Seismic behavior of cable-stayed bridges under traveling wave excitation[J].China Civil Engineering Journal,1996,29(6):61-68.
[5]Fang Lichu,Wang Junjie,Chen Wei.Response characteristics of long-span cable-stayed bridges under non-uniform seismic action[J].Chi-nese Journal of Computational Mechanics,2001,18(3):358-363.
[6]Liu Hongbing,Zhu Xi.Effects on large-span cable-stayed bridge for spatially varying earthquake ground motions[J].Journal of Northern Jiao-tong Universit,2000,24(1):23-27.
[7]Allam S M,Datta TK.Analysis of cable-stayed bridges under multi-component random ground motion by response spectrum method[J].En-gineering Structure,2000,22(10):1367-1377.
[8]Allam S M,Datta TK.Seismic behavior of cable-stayed bridges under multi-component random ground motion[J].Engineering Structure,1999,21(1):62-74.
[9]Soyluk K,Dumanoglu A A.Comparison of asynchronous and stochastic dynamic responses of a cable-stayed bridge[J].Engineering Structure,2000,22(5):435-445.
[10]Kiureghian A D,Neuenhofer A.Response spectrum method for multi-support seismic excitations[J].Earthquake Engineering and StructuralDynamics,1992,21(8):713-740.
[11]Loh C H,Yeh Y T.Spatial variation and stochastic modeling of seismic differential ground movement[J].Earthquake Engineering and StructuralDynamics,1988,16(4):583-596.
[12]Pu Huairen,Li Sanzhen,Ning Xiaojun.Analytical research on the dynamic characteristics and calculation model of long-span cable-stayedbridge[J].Journal of Kunming University of Science and Technology,2002,27(6):96-98.
[2]Fan Lichu,Yuan Wancheng,Hu Shide.Longitudinal seismic response analysis for Shanghai Nanpu Bridge[J].China Civil Engineering Journal,1992,25(3):2-8.
[3]Nazmy A S,Abdel G A M.Effects of ground motion spatial variability on the response of cable-stayed bridges[J].Earthquake Engineering andStructural Dynamics,1992,21(1):1-20.
[4]Chen Youping,Zhou Hongye.Seismic behavior of cable-stayed bridges under traveling wave excitation[J].China Civil Engineering Journal,1996,29(6):61-68.
[5]Fang Lichu,Wang Junjie,Chen Wei.Response characteristics of long-span cable-stayed bridges under non-uniform seismic action[J].Chi-nese Journal of Computational Mechanics,2001,18(3):358-363.
[6]Liu Hongbing,Zhu Xi.Effects on large-span cable-stayed bridge for spatially varying earthquake ground motions[J].Journal of Northern Jiao-tong Universit,2000,24(1):23-27.
[7]Allam S M,Datta TK.Analysis of cable-stayed bridges under multi-component random ground motion by response spectrum method[J].En-gineering Structure,2000,22(10):1367-1377.
[8]Allam S M,Datta TK.Seismic behavior of cable-stayed bridges under multi-component random ground motion[J].Engineering Structure,1999,21(1):62-74.
[9]Soyluk K,Dumanoglu A A.Comparison of asynchronous and stochastic dynamic responses of a cable-stayed bridge[J].Engineering Structure,2000,22(5):435-445.
[10]Kiureghian A D,Neuenhofer A.Response spectrum method for multi-support seismic excitations[J].Earthquake Engineering and StructuralDynamics,1992,21(8):713-740.
[11]Loh C H,Yeh Y T.Spatial variation and stochastic modeling of seismic differential ground movement[J].Earthquake Engineering and StructuralDynamics,1988,16(4):583-596.
[12]Pu Huairen,Li Sanzhen,Ning Xiaojun.Analytical research on the dynamic characteristics and calculation model of long-span cable-stayedbridge[J].Journal of Kunming University of Science and Technology,2002,27(6):96-98.
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