近断层地震动作用下桥梁结构易损性曲面分析
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摘要
本文将易损性曲面方法拓展应用于近场地震动潜在破坏性效应对桥梁结构的影响分析,考虑近场和一般场地地震动效应,对某钢筋混凝土(RC)桥梁结构地震易损性进行了分析。该方法综合考虑了RC桥梁本身和烈度指标(IM)的不确定性以及桥梁体系的损伤特性,以评估近场地震效应的潜在破坏性。以一座城市桥梁为例,易损性分析结果表明:对RC桥梁结构进行地震易损性分析时,单一标量IM会低估地震动潜在破坏性效应,近场地震效应会增加桥梁结构的损伤概率。与传统标量的易损性曲线相比,本文方法可以有效地反映地震动烈度引起的RC桥梁结构失效概率变化。
The seismic fragility surface analysis method is extended into vulnerability analysis of RC bridges subjected to near-fault ground motion. Compared with classical site condition,the near-fault effect on the RC bridges is conducted. The assessment of the damage potential of near-fault ground motion has taken into account the uncertainty of RC bridge and of intensity measure( IM) and the damage characteristics of bridges. An urban bridge is taken as the analysis model. Fragility surfaces of the RC bridge illustrates that,taking into account the complexity of the seismic excitation,the scalar IM tends to neglect some important characteristics of ground motion when conducting the seismic vulnerability analysis. The near-fault effect will increase the failure probability. Compared with the fragility curves formed with scalar IM,the fragility surfaces can reflect the variability of vulnerability failure probability of the RC bridges caused by the variation of intensity measurement parameter. The fragility surface analysis can evaluate the seismic performance of the RC bridges more accurately.
The seismic fragility surface analysis method is extended into vulnerability analysis of RC bridges subjected to near-fault ground motion. Compared with classical site condition,the near-fault effect on the RC bridges is conducted. The assessment of the damage potential of near-fault ground motion has taken into account the uncertainty of RC bridge and of intensity measure( IM) and the damage characteristics of bridges. An urban bridge is taken as the analysis model. Fragility surfaces of the RC bridge illustrates that,taking into account the complexity of the seismic excitation,the scalar IM tends to neglect some important characteristics of ground motion when conducting the seismic vulnerability analysis. The near-fault effect will increase the failure probability. Compared with the fragility curves formed with scalar IM,the fragility surfaces can reflect the variability of vulnerability failure probability of the RC bridges caused by the variation of intensity measurement parameter. The fragility surface analysis can evaluate the seismic performance of the RC bridges more accurately.
引文
[1]Hwang H,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.
[2]Nielson B G.Analytical fragility curves for highway bridges in moderate seismic zones[D]:Georgia Institute of Technology.2005.
[3]Padgett J E,DesRoches R.Methodology for the development of analytical fragility curves for retrofitted bridges[J].Earthquake Engineering&Structural Dynamics.2008,37(8):1157-1174.
[4]Baker J W,Cornell C A.A vector-valued ground motion intensity measure consisting of spectral acceleration and epsilon[J].Earthquake Engineering&Structural Dynamics.2005,34(10):1193-1217.
[5]Seyedi D M,Gehl P,Douglas J,et al.Development of seismic fragility surfaces for reinforced concrete buildings by means of nonlinear time-history analysis[J].Earthquake Engineering&Structural Dynamics.2010,39(1):91-108.
[6]Gehl P,Seyedi D,Douglas J.Vector-valued fragility functions for seismic risk evaluation[J].Bulletin of Earthquake Engineering.2013,11(2):365-384.
[7]Li H,Yi W J,Yuan X X.Fuzzy-valued intensity measures for near-fault pulse-like ground motions[J].Computer-Aided Civil and Infrastructure Engineering.2013,28(10):780-795.
[8]Baker J W,Cornell C A.Vector-valued intensity measures incorporating spectral shape for prediction of structural response[J].Journal of Earthquake Engineering.2008,12(4):534-554.
[9]Pan Y,Agrawal A,Ghosn M,et al.Seismic fragility of multispan simply supported steel highway bridges in new york state.Ii:fragility analysis,fragility curves,and fragility surfaces[J].Journal of Bridge Engineering.2010,15(5):462-472.
[10]李杨.近场地震作用下钢筋混凝土桥梁的地震易损性分析[D].天津:天津大学.2013.
[11]Penzien J,Scheffey C F,Parmelee R A.Seismic analysis of bridges on long piles[J].Journal of Engineering Mechanics Division.1964,90(EM3):223-254.
[12]Aviram A,Mackie K,Stojadinovic B.Effect of abutment modeling on the seismic response of bridge structures[C]∥In Proc Proceedings of the Fifth National Seismic Conference on Bridges and Highways San Francisco,September 18-20,2006.
[13]Baker J W.Quantitative Classification of near-fault ground motions using wavelet analysis[J].Bulletin of the Seismological Society of America.2007,97(5):1486-1501.
[14]Hwang H,Liu J B,Chiu Y H.2001.Seismic fragility analysis of highway bridges[R].Mephis:Mid-America Earthquake Center.
[2]Nielson B G.Analytical fragility curves for highway bridges in moderate seismic zones[D]:Georgia Institute of Technology.2005.
[3]Padgett J E,DesRoches R.Methodology for the development of analytical fragility curves for retrofitted bridges[J].Earthquake Engineering&Structural Dynamics.2008,37(8):1157-1174.
[4]Baker J W,Cornell C A.A vector-valued ground motion intensity measure consisting of spectral acceleration and epsilon[J].Earthquake Engineering&Structural Dynamics.2005,34(10):1193-1217.
[5]Seyedi D M,Gehl P,Douglas J,et al.Development of seismic fragility surfaces for reinforced concrete buildings by means of nonlinear time-history analysis[J].Earthquake Engineering&Structural Dynamics.2010,39(1):91-108.
[6]Gehl P,Seyedi D,Douglas J.Vector-valued fragility functions for seismic risk evaluation[J].Bulletin of Earthquake Engineering.2013,11(2):365-384.
[7]Li H,Yi W J,Yuan X X.Fuzzy-valued intensity measures for near-fault pulse-like ground motions[J].Computer-Aided Civil and Infrastructure Engineering.2013,28(10):780-795.
[8]Baker J W,Cornell C A.Vector-valued intensity measures incorporating spectral shape for prediction of structural response[J].Journal of Earthquake Engineering.2008,12(4):534-554.
[9]Pan Y,Agrawal A,Ghosn M,et al.Seismic fragility of multispan simply supported steel highway bridges in new york state.Ii:fragility analysis,fragility curves,and fragility surfaces[J].Journal of Bridge Engineering.2010,15(5):462-472.
[10]李杨.近场地震作用下钢筋混凝土桥梁的地震易损性分析[D].天津:天津大学.2013.
[11]Penzien J,Scheffey C F,Parmelee R A.Seismic analysis of bridges on long piles[J].Journal of Engineering Mechanics Division.1964,90(EM3):223-254.
[12]Aviram A,Mackie K,Stojadinovic B.Effect of abutment modeling on the seismic response of bridge structures[C]∥In Proc Proceedings of the Fifth National Seismic Conference on Bridges and Highways San Francisco,September 18-20,2006.
[13]Baker J W.Quantitative Classification of near-fault ground motions using wavelet analysis[J].Bulletin of the Seismological Society of America.2007,97(5):1486-1501.
[14]Hwang H,Liu J B,Chiu Y H.2001.Seismic fragility analysis of highway bridges[R].Mephis:Mid-America Earthquake Center.
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