地震作用下高架桥结构的脆弱性
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摘要
用能力谱方法和非线性动力分析方法分别建立了高架桥结构的脆弱性曲线。对用两种方法建立的脆弱性曲线进行比较发现:对于保护层混凝土剥落破坏状态,由两种方法分析的结果相差不大;对于纵筋屈曲和倒塌破坏状态,用能力谱方法分析的高架桥结构在给定地面运动强度下的失效概率偏低;用能力谱方法进行分析方便快速,但对于严重破坏状态分析精度较低;在应用非线性动力分析方法时需要对结构进行大量的动力时程分析,但结果精确可靠。
Fragility curves of viaduct structure were developed by capacity spectrum method and nonlinear dynamic analysis method respectively.The comparison between fragility curves got from the two methods shows that there is no remarkable difference for concrete spalling damage state in protection layer,and capacity spectrum method underestimates the failure probability of longitudinal reinforcement buckling and collapse for the viaduct structure under given ground motion intensity.Capacity spectrum method is simple and quick,but it provides low accurate results for severe damage states.In contrast,nonlinear dynamic analysis method can get the accurate and reliable results,but it requires much dynamic time-history analysis for structures.
Fragility curves of viaduct structure were developed by capacity spectrum method and nonlinear dynamic analysis method respectively.The comparison between fragility curves got from the two methods shows that there is no remarkable difference for concrete spalling damage state in protection layer,and capacity spectrum method underestimates the failure probability of longitudinal reinforcement buckling and collapse for the viaduct structure under given ground motion intensity.Capacity spectrum method is simple and quick,but it provides low accurate results for severe damage states.In contrast,nonlinear dynamic analysis method can get the accurate and reliable results,but it requires much dynamic time-history analysis for structures.
引文
[1]邵长江,吴永红,钱永久.混凝土桥梁结构非线性地震损伤演化[J].中国公路学报,2006,19(5):41-45.SHAO Chang-jiang,WU Yong-hong,QIAN Yong-jiu.Evolution of Nonlinear Seismic Damage of Con-crete Bridge Structure[J].China Journal of Highwayand Transport,2006,19(5):41-45.
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[11]GARDONI P.Probabilistic Models and Fragility Esti-mates for Structural Components and Systems[D].Berkeley:University of California,2002.
[12]宋一凡,王玉萍.计入弹性基础效应的钢筋混凝土桥梁结构塑性倒塌分析[J].交通运输工程学报,2003,3(3):26-31.SONG Yi-fan,WANG Yu-ping.Plastic CollapseMechanism of Seismic Assessment for Existing RCBridges with Flexible Foundation and Bearing Pads[J].Journal of Traffic and Transportation Engineer-ing,2003,3(3):26-31.
[13]宋一凡,贺拴海,曹继伟.基于能量原理的框架桥墩地震力分析[J].长安大学学报:自然科学版,2002,22(1):36-40.SONG Yi-fan,HE Shuan-hai,CAO Ji-wei.Analysisfor Transverse Seismic Forces of Frame Bridge PiersBased on Principle[J].Journal of Chang an Universi-ty:Natural Science Edition,2002,22(1):36-40.
[14]DUTTA A.On Energy Based Seismic Analysis andDesign of Highway Bridges[D].Buffalo:State Uni-versity of New York,1999.
[15]National Institute of Building Sciences.HAZUS 99Technical Manual[M].Washington DC:Federal E-mergency Management Agency,1999.
[16]VAMVATSIKOS D,CORNELL C A.IncrementalDynamic Analysis[J].Earthquake Engineering andStructural Dynamics,2002,31(3):491-514.
[17]SHOME N.Probabilistic Seismic Demand Analysis ofNonlinear Structures[D].Stanford:Stanford Univer-sity,1999.
[2]王锁军,王元清,吴杰,等.组合梁刚度对组合框架的抗震性能影响分析[J].建筑科学与工程学报,2006,23(1):39-44.WANG Suo-jun,WANG Yuan-qing,WU Jie,et al.A-nalysis of Composite Beam Rigidity Influencing Seis-mic Properties of Composite Frame[J].Journal of Ar-chitecture and Civil Engineering,2006,23(1):39-44.
[3]刘健新,张伟,张茜.洛河特大桥抗震性能计算[J].交通运输工程学报,2006,6(1):57-62.LIU Jian-xin,ZHANG Wei,ZHANG Qian.Anti-seis-mic Performance Calculation of Luohe Bridge[J].Journal of Traffic and Transportation Engineering,2006,6(1):57-62.
[4]李忠献,黄健,丁阳,等.不同地震激励下大跨度斜拉桥的地震反应分析[J].中国公路学报,2005,18(3):48-53.LI Zhong-xian,HUANG Jian,DING Yang,et al.Seis-mic Responses of Long-span Cable-stayed BridgesUnder Different Patterns of Earthquake Excitations[J].China Journal of Highway and Transport,2005,18(3):48-53.
[5]易伟建,张颖.混凝土框架结构抗震设计的弯矩增大系数[J].建筑科学与工程学报,2006,23(2):46-51.YI Wei-jian,ZHANG Ying.Moment MagnificationFactor in Anti-seismic Design of Concrete FrameStructure[J].Journal of Architecture and Civil Engi-neering,2006,23(2):46-51.
[6]王东升,杨海红,王国新.考虑邻梁碰撞的多跨长简支梁桥落梁震害分析[J].中国公路学报,2005,18(3):54-59.WANG Dong-sheng,YANG Hai-hong,WANG Guo-xin.Seismic Analysis of Girders Falling Down inMulti-span Long Simply Supported Bridges with Ad-jacent Pounding Effects[J].China Journal of Highwayand Transport,2005,18(3):54-59.
[7]MEDINA R.Seismic Demands for Non-deterioratingFrame Structures and Their Dependence on GroundMotion[D].Stanford:Stanford University,2002.
[8]GB 50011—2001,建筑抗震设计规范[S].GB 50011—2001,Code for Seismic Design of Build-ings[S].
[9]李新乐.近断层区桥梁结构的设计地震与抗震性能的研究[D].北京:北京交通大学,2004.LI Xin-le.Study on Earthquake and Seismic Perform-ance of Bridge near Fault Areas[D].Beijing:BeijingJiaotong University,2004.
[10]BERRY M P,EBERHARD M O.Performance Mod-els for Flexural Damage in Reinforced Concrete Col-umns[R].Berkeley:PEER,2003.
[11]GARDONI P.Probabilistic Models and Fragility Esti-mates for Structural Components and Systems[D].Berkeley:University of California,2002.
[12]宋一凡,王玉萍.计入弹性基础效应的钢筋混凝土桥梁结构塑性倒塌分析[J].交通运输工程学报,2003,3(3):26-31.SONG Yi-fan,WANG Yu-ping.Plastic CollapseMechanism of Seismic Assessment for Existing RCBridges with Flexible Foundation and Bearing Pads[J].Journal of Traffic and Transportation Engineer-ing,2003,3(3):26-31.
[13]宋一凡,贺拴海,曹继伟.基于能量原理的框架桥墩地震力分析[J].长安大学学报:自然科学版,2002,22(1):36-40.SONG Yi-fan,HE Shuan-hai,CAO Ji-wei.Analysisfor Transverse Seismic Forces of Frame Bridge PiersBased on Principle[J].Journal of Chang an Universi-ty:Natural Science Edition,2002,22(1):36-40.
[14]DUTTA A.On Energy Based Seismic Analysis andDesign of Highway Bridges[D].Buffalo:State Uni-versity of New York,1999.
[15]National Institute of Building Sciences.HAZUS 99Technical Manual[M].Washington DC:Federal E-mergency Management Agency,1999.
[16]VAMVATSIKOS D,CORNELL C A.IncrementalDynamic Analysis[J].Earthquake Engineering andStructural Dynamics,2002,31(3):491-514.
[17]SHOME N.Probabilistic Seismic Demand Analysis ofNonlinear Structures[D].Stanford:Stanford Univer-sity,1999.
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