地震波反应谱对大跨径桥梁结构地震反应的影响研究
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摘要
地震经验表明:地面运动的频谱特性对大跨径桥梁结构地震反应的影响显著。生成合理的人工波,对一座高速公路双塔大跨径斜拉桥进行非线性动力时程分析,对比地震波反应谱与斜拉桥结构地震反应的相关性表明:不同反应谱区段的累积质量参与系数以及谱形的差异程度对结构地震反应影响显著,短周期反应谱区段的影响要大于长周期区段。在动力分析中选择输入地面运动时,需要综合考虑对结构地震反应贡献显著的所有反应谱区段与目标谱的匹配情况。
The frequency content of earthquake ground motions has an important effect on the seismic response of the long-span bridges because of complexity of dynamic properties.The nonlinear dynamic time-history analysis is conducted for a two-pylon long-span cable-stayed bridge from artificial earthquake accelerograms.The correlation between the frequency content of earthquake accelerograms and the seismic response of the cable-stayed bridge reveals that the cumulative modal mass participation and difference in different parts of response spectra have significant effects on the seismic response of structures.The effects of the short-period parts of response spectra on seismic response are more significant than those of the long-period parts.All parts of response spectra which have great contribution to the seismic response of structures should be matched to target spectra.
The frequency content of earthquake ground motions has an important effect on the seismic response of the long-span bridges because of complexity of dynamic properties.The nonlinear dynamic time-history analysis is conducted for a two-pylon long-span cable-stayed bridge from artificial earthquake accelerograms.The correlation between the frequency content of earthquake accelerograms and the seismic response of the cable-stayed bridge reveals that the cumulative modal mass participation and difference in different parts of response spectra have significant effects on the seismic response of structures.The effects of the short-period parts of response spectra on seismic response are more significant than those of the long-period parts.All parts of response spectra which have great contribution to the seismic response of structures should be matched to target spectra.
引文
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11 Jamie E.Padgett,Bryant G.Nielson and ReginaldDesRoches.Selection of optimal intensity measures inprobabilistic seismic demand models of highway bridgeportfolios[J].Earthquake Engineering And Structur-al Dynamics.2008,37:711-725.
12 Bryant G.Nielson and Reginald DesRoches.Seismicfragility methodology for highway bridges using acomponent level approach[J].Earthquake EngngStruct.Dyn.2007;36:823-839.
13 Jorge Eduardo Carballo Arevalo.Probabilistic Seis-mic Demand Analysis-Spectrum Matching and Design[D].Ph.D.Thesis,Stanford University,2000.
14 H.Hwang,刘晶波.地震作用下钢筋混凝土桥梁结构易损性分析[J].土木工程学报,2004,37(6):47-51.
15 Olsson A.J.and Sandberg G.E..Latin HypercubeSampling for Stochastic Finite Element Analysis[J].Jour-nal of Engineering Mechanics.2002.128(1):121-125.
2 Sashi K.Kunnath.Application of the PEER PBEEMethodology to the I-880 Viaduct[R].PacificEarthquake Engineering Research Center College ofEngineering University of California,Berkeley.PEERReport 2006/10.
3 Shome N.Probabilistic seismic demand analysis of non-linearstructures.Ph.D.Thesis,Stanford University[D].1999.
4 Shome,N.,Cornell,C.A.,Bazzurro,P.,and Carbal-lo,J.E.Earthquakes,records and nonlinear responses[J].Earthquake Spectral.1998,14(3):469-500.
5 Bazzuro P.,Probabilistic seismic demand analysis[D].,Ph.D.Dissertation,Dept.of Civil and Environmental En-gineering,Stanford University,California.1998.
6胡聿贤.地震工程学(第二版)[M].北京:地震出版社,2006:150-173.
7李杰,李国强.地震工程学导论[M].北京:地震出版社,1992:46-74.
8范立础.桥梁抗震[M].上海:同济大学出版社,1997:57-75.
9陈亮,李建中,盛光祖.考虑强地面运动持时的概率分布对桥墩结构概率地震需求的影响[J].公路交通科技,2009,26(2):47-52.
10 Baker J.W.,Vector-Valued Ground Motion Inten-sity Measures for probabilistic Seismic Demand Analy-sis[D].Ph.D.Thesis,Stanford University.2005.
11 Jamie E.Padgett,Bryant G.Nielson and ReginaldDesRoches.Selection of optimal intensity measures inprobabilistic seismic demand models of highway bridgeportfolios[J].Earthquake Engineering And Structur-al Dynamics.2008,37:711-725.
12 Bryant G.Nielson and Reginald DesRoches.Seismicfragility methodology for highway bridges using acomponent level approach[J].Earthquake EngngStruct.Dyn.2007;36:823-839.
13 Jorge Eduardo Carballo Arevalo.Probabilistic Seis-mic Demand Analysis-Spectrum Matching and Design[D].Ph.D.Thesis,Stanford University,2000.
14 H.Hwang,刘晶波.地震作用下钢筋混凝土桥梁结构易损性分析[J].土木工程学报,2004,37(6):47-51.
15 Olsson A.J.and Sandberg G.E..Latin HypercubeSampling for Stochastic Finite Element Analysis[J].Jour-nal of Engineering Mechanics.2002.128(1):121-125.
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