超高墩大跨部分曲线连续刚构桥地震反应分析
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摘要
基于时程分析法,借助大型有限元计算程序,以四川某超高墩大跨部分曲线连续刚构桥为背景,对该桥进行了自振特性及地震反应分析,对比研究了同条件下部分曲线桥与直线桥的抗震性能的差异,对左右幅之间的横向联系对结构整体刚度的贡献及对结构整体抗震性能的影响也进行了相应研究。研究结论表明:该类结构的曲线线形对自振频率的影响较少,其结构刚度主要受制于桥墩,若在左右幅之间增设横向联系,将在很大程度上改善结构的受力;该类结构的抗震性能受主梁与桥墩二者刚度比值的影响较明显,当二者刚度比值处于合理范围时能有效的降低结构位移动力响应,有利于结构的抗震;此外,桥墩的高度对结构的动力稳定性的影响较大,随着桥墩高度降低,结构动力稳定性越趋于稳定。
Based on the time history analysis method and large finite element program,the natural vibration characteristics and the seismic response of a partial curve long-span continuous rigid frame bridge with super high piers in Sichuan were analysed.Comparative study of antiseismic performance between partial curve bridge and straight bridge was performed.The contribution of the lateral rigidity reinforcement of the structure and its influence on antiseismic performance of the structure were researched respectively.The conclusion of the study shows that(1) The geometric configuration of this kind of structure has little influence on the natural frequency,and its structural rigidity is mainly effected by the bridge piers.If additionally build the lateral rigidity reinforcement,the mechanics characteristic of the structure will be improved greatly.(2) The antiseismic performance of this kind of structure is obviously influenced by the rigidity ratio between the girder and the pier.When the rigidity ratio is in the reasonable scope,the structural dynamic response can be effectively reduced to improve the structure seismic behavior.(2) The height of the piers has great influence on the dynamic stability,the lower the height is,the better the dynamic stability is.
Based on the time history analysis method and large finite element program,the natural vibration characteristics and the seismic response of a partial curve long-span continuous rigid frame bridge with super high piers in Sichuan were analysed.Comparative study of antiseismic performance between partial curve bridge and straight bridge was performed.The contribution of the lateral rigidity reinforcement of the structure and its influence on antiseismic performance of the structure were researched respectively.The conclusion of the study shows that(1) The geometric configuration of this kind of structure has little influence on the natural frequency,and its structural rigidity is mainly effected by the bridge piers.If additionally build the lateral rigidity reinforcement,the mechanics characteristic of the structure will be improved greatly.(2) The antiseismic performance of this kind of structure is obviously influenced by the rigidity ratio between the girder and the pier.When the rigidity ratio is in the reasonable scope,the structural dynamic response can be effectively reduced to improve the structure seismic behavior.(2) The height of the piers has great influence on the dynamic stability,the lower the height is,the better the dynamic stability is.
引文
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[7]何钦象,田小红,宋丹.高墩大跨径连续刚构桥抗震性能评估[J].振动与冲击,2009,28(1):68-71.HE Qinxiang,TIAN Xiaohong,SONG Dan.AstigmaticPerformance Evaluation of a Long-span Continuous RigidFrame Bridge with Tall Piers[J].Journal of Vibration andShock,2009,28(1):68-71.
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[10]KENTD C,PARK R.Flexural Members with ConfinedConcrete[J].Journal of Structural Division,ASCE,1971,97(ST7):1969-1990.
[11]WONG P K C,PRIESTLEY M J N,PARK R.SeismicResistance of Frames with Vertically DistributedLongitudinal Reinforcement in Beams[J].ACI StructuralJournal,1990,87(4):488-489.
[12]丰硕,项贻强,谢旭.超大跨度悬索桥的动力特性及地震反应分析[J].公路交通科技,2005,22(8):31-35.FENG Shuo,XIANG Yiqiang,XIE Xu.DynamicCharacteristics and Multi-support Seismic ResponseAnalysis of a Super-large-span Suspension Bridge[J].Journal of Highway and Transportation Research andDevelopment,2005,22(8):31-35.
[13]李晓莉,喻宝金.三塔单索面PC斜拉桥的地震反应研究[J].公路交通科技,2006,23(2):83-85.LI Xiaoli,YU Baojin.Analysis of Seismic Response forPC Cable-stayed Bridge with Three Towers and SingleCable Plane[J].Journal of Highway and TransportationResearch and Development,2006,23(2):83-85.
[14]张海龙,张鹏,黄鹏.深水桥梁结构的地震反应分析[J].公路交通科技,2007,24(9):83-86.ZHANG Hailong,ZHANG Peng,HUANG Peng.Earthquake Response of Deep Water Bridge Structure[J].Journal of Highway and Transportation Research andDevelopment,2007,24(9):83-86.
[15]亓兴军,李小军,侯春林.简支箱梁桥地震反应半主动控制分析[J].公路交通科技,2007,24(7):60-63.QI Xingjun,LI Xiaojun,HOU Chunlin.Analysis ofSeismic Response Semi-active Control for Simply SupportedBox Beam Bridge[J].Journal of Highway andTransportation Research and Development,2007,24(7):60-63.
[2]何波,朱宏平,李俊,等.大跨薄壁墩连续刚构桥抗震性能分析[J].华中科技大学学报:城市科学版,2006,23(4):51-56.HE Bo,ZHU Hongping,LI Jun,et al.Ant-seismicPerformance Analysis of a Large-span Continuous RigidFrame Bridge[J].Journal of Huazhong University:UrbanScience Edition,2006,23(4):51-56.
[3]陈卉卉,贾程.大跨度连续刚构桥的地震反应分析[J].盐城工学院学报:自然科学版,2008,21(2):74-78.CHEN Huihui1,JIA Cheng.Seismic Analysis of Long-span Continuous Rigid Fame Bridges[J].Journal ofYancheng Institute of Technology:Natural ScienceEdition,2008,21(2):74-78.
[4]张伟,刘建新,张茜,等.大跨径连续刚构桥地震反应分析[J].工程抗震与加固改造,2005,27(6):75-78.ZHANG Wei,LIU Jianxin,ZHANG Qian,et al.SeismicResponse Analysis of Long-span Continuous Rigid-framedBridge[J].Earthquake Resistant Engineering andRetrofitting,2005,27(6):75-78.
[5]黄小国,胡大琳.地震动的空间变化对连续刚构桥随机地震反应分析[J].公路工程,2008,33(2):58-63.HUANG Xiaoguo,HU Dalin.Random Seismic ResponseAnalysis of Continuous Rigid-framed Bridge for SpatiallyVariant Ground Motion[J].Highway Engineering,2008,33(2):58-63.
[6]李黎,叶志雄,吴璟.隔震连续梁桥地震作用下梁间碰撞响应的研究[J].公路交通科技,2009,26(7):100-104.LI Li,YE Zhixiong,WU Jing.Analysis on SeismicPounding Responses of Isolated Continuous Girder Bridgeunder Earthquake Excitation[J].Journal of Highway andTransportation Research and Development,2009,26(7):100-104.
[7]何钦象,田小红,宋丹.高墩大跨径连续刚构桥抗震性能评估[J].振动与冲击,2009,28(1):68-71.HE Qinxiang,TIAN Xiaohong,SONG Dan.AstigmaticPerformance Evaluation of a Long-span Continuous RigidFrame Bridge with Tall Piers[J].Journal of Vibration andShock,2009,28(1):68-71.
[8]吴启明,王典斌.高墩大跨连续刚构桥的抗震能力分析[J].中国水运,2009,9(4):211-213.WU Qiming,WANG Dabin.Analysis of SeismicResponses for High-pier Long-span Continual Rigid FrameBridge[J].China Water Transport,2009,9(4):211-213.
[9]黄小国,胡大琳,张后举.行波效应对大跨度连续刚构桥地震反应的影响[J].长安大学学报:自然科学版,2008,28(1):72-76.HUANG Xiaoguo,HU Dalin,ZHAN Ghouju.Effects ofTraveling Wave to Seismic Response of Long Span Rigid-framed Bridge[J].Journal of Chang an University:Natural Science Edition,2008,28(1):72-76.
[10]KENTD C,PARK R.Flexural Members with ConfinedConcrete[J].Journal of Structural Division,ASCE,1971,97(ST7):1969-1990.
[11]WONG P K C,PRIESTLEY M J N,PARK R.SeismicResistance of Frames with Vertically DistributedLongitudinal Reinforcement in Beams[J].ACI StructuralJournal,1990,87(4):488-489.
[12]丰硕,项贻强,谢旭.超大跨度悬索桥的动力特性及地震反应分析[J].公路交通科技,2005,22(8):31-35.FENG Shuo,XIANG Yiqiang,XIE Xu.DynamicCharacteristics and Multi-support Seismic ResponseAnalysis of a Super-large-span Suspension Bridge[J].Journal of Highway and Transportation Research andDevelopment,2005,22(8):31-35.
[13]李晓莉,喻宝金.三塔单索面PC斜拉桥的地震反应研究[J].公路交通科技,2006,23(2):83-85.LI Xiaoli,YU Baojin.Analysis of Seismic Response forPC Cable-stayed Bridge with Three Towers and SingleCable Plane[J].Journal of Highway and TransportationResearch and Development,2006,23(2):83-85.
[14]张海龙,张鹏,黄鹏.深水桥梁结构的地震反应分析[J].公路交通科技,2007,24(9):83-86.ZHANG Hailong,ZHANG Peng,HUANG Peng.Earthquake Response of Deep Water Bridge Structure[J].Journal of Highway and Transportation Research andDevelopment,2007,24(9):83-86.
[15]亓兴军,李小军,侯春林.简支箱梁桥地震反应半主动控制分析[J].公路交通科技,2007,24(7):60-63.QI Xingjun,LI Xiaojun,HOU Chunlin.Analysis ofSeismic Response Semi-active Control for Simply SupportedBox Beam Bridge[J].Journal of Highway andTransportation Research and Development,2007,24(7):60-63.
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