桥梁高墩地震反应中高阶振型贡献程度的分析
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摘要
针对山区典型不同高度桥墩,通过增量动力分析(Incremental Dynamic Analysis-IDA)研究高墩在地震作用下从弹性状态到极限状态的整个反应过程,得到不同塑性程度下墩身的位移分布,并通过对各级地震动输入下墩底曲率达到最大时刻的结构刚度进行瞬时模态分析,探讨了整个非线性过程中瞬时振型、瞬时振型参与系数、瞬时质量参与系数以及各阶瞬时周期对应的延性位移谱值随着墩底曲率增加的变化,揭示了整个非线性过程中高阶振型参与程度的变化,进而对在各级地震动作用下墩底达到曲率最大值时刻的墩身位移分布中的高阶振型贡献程度进行评估。
For the bridges pier with different height in mountainous areas,the incremental dynamic analysis(IDA) is used to research the entire process of nonlinear seismic response from elastic state to ultimate state,thus getting the displacement cures of pier under different degrees of nonlinearity.Modal analysis is carried out for transient structure stiffness when pier curvature reaches the maximum value under different lever ground motion.The change trend of transient mode shape,transient modal participation factors,transient modal participating mass ratios and displacement spectral amplification of constant-ductility inelastic spectra are investigate with the increasing of pier base curvature,revealing the trend of higher modes contribution,and then an evaluation is made of higher modes contribution to the displacement curves when the pier base curvature reaches the maximum value under different lever ground motion.
For the bridges pier with different height in mountainous areas,the incremental dynamic analysis(IDA) is used to research the entire process of nonlinear seismic response from elastic state to ultimate state,thus getting the displacement cures of pier under different degrees of nonlinearity.Modal analysis is carried out for transient structure stiffness when pier curvature reaches the maximum value under different lever ground motion.The change trend of transient mode shape,transient modal participation factors,transient modal participating mass ratios and displacement spectral amplification of constant-ductility inelastic spectra are investigate with the increasing of pier base curvature,revealing the trend of higher modes contribution,and then an evaluation is made of higher modes contribution to the displacement curves when the pier base curvature reaches the maximum value under different lever ground motion.
引文
[1]重庆交通科研设计院.JTG/T B02-01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
[2]California Department of Transportation.Caltrans Seismic Design Criteria Version 1.5[S].State of California:Business Trans-portation and Housing Agency,2009.
[3]李建中,宋晓东,范立础.桥梁高墩位移延性能力的探讨[J].地震工程与工程振动,2005,25(1):43-48.
[4]梁智垚.非规则高墩桥梁抗震设计理论研究[D].上海:同济大学土木工程学院,2007.
[5]Rosario Ceravolo,Giacomo Vincenzo Demarie,Luca Giordano,Giuseppe Mancini,Donato Sabia.Problems in applying code-specified capacity design procedures to seismic design of tall piers[J].Engineering Structures,2009,31:1811-1821.
[6]Anil K Chopra.Dynamics of structures:theory and applications to earthquake engineering[M].New Jersey:Prentice Hall,Inc,2001.
[7]Silvia Mazzoni,Frank McKenna,Michael H.Open system for earthquake engineering simulation user manual[M].Berkeley:Pacific Earthquake Engineering Research Center,University of California,2007.
[8]Mander J B,Priestly M J N,Park R.Theoretical stress-strain model for confined concrete[J].Journal of Structural Engineer,ASCE,1988,114(8):1806-1826.
[2]California Department of Transportation.Caltrans Seismic Design Criteria Version 1.5[S].State of California:Business Trans-portation and Housing Agency,2009.
[3]李建中,宋晓东,范立础.桥梁高墩位移延性能力的探讨[J].地震工程与工程振动,2005,25(1):43-48.
[4]梁智垚.非规则高墩桥梁抗震设计理论研究[D].上海:同济大学土木工程学院,2007.
[5]Rosario Ceravolo,Giacomo Vincenzo Demarie,Luca Giordano,Giuseppe Mancini,Donato Sabia.Problems in applying code-specified capacity design procedures to seismic design of tall piers[J].Engineering Structures,2009,31:1811-1821.
[6]Anil K Chopra.Dynamics of structures:theory and applications to earthquake engineering[M].New Jersey:Prentice Hall,Inc,2001.
[7]Silvia Mazzoni,Frank McKenna,Michael H.Open system for earthquake engineering simulation user manual[M].Berkeley:Pacific Earthquake Engineering Research Center,University of California,2007.
[8]Mander J B,Priestly M J N,Park R.Theoretical stress-strain model for confined concrete[J].Journal of Structural Engineer,ASCE,1988,114(8):1806-1826.
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