曲率半径变化对曲线梁桥粘滞阻尼器减震效果的影响
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摘要
建立某曲线刚构-连续组合梁桥的空间有限元计算模型,在桥梁活动支座部位设置粘滞阻尼器,进而考虑曲率半径的变化,计算分析了结构在3条3向地震动作用下曲率半径变化对结构反应以及粘滞阻尼器减震效果的影响。结果表明:不添加阻尼器的曲线梁桥的动力反应不仅与曲线桥的曲率半径有关,而且还跟地震动特性有关;添加粘滞阻尼器后控制点内力在不同地震动作用下均随着曲线桥曲率半径的增大而增大;粘滞阻尼器对于曲线桥控制点内力和主梁位移的减震率在不同地震动作用下均随曲线桥曲率半径的增大而减小。为粘滞阻尼器在不同半径曲线梁桥上的应用提供了理论指导。
The 3D FE computational model of a curved rigid-continuous composite girder bridge was established,viscous dampers were set at the positions of sliding bearings.Considered the variation of radius of curvature,the effect of variation of radius of curvature on structural response and seismic mitigation effect of viscous dampers under three ground motions in three directions was analyzed.The results show that(1) the dynamic response of curved girder bridge without viscous dampers related to both radius of curvature and ground motion characteristics;(2) with viscous dampers,the internal force of control point increased when the radius of curvature increased under different ground motions;(3) the internal force of control point and seismic mitigation ratio of displacement of main girder due to viscous dampers decreased when the radius of curvature increased under different ground motions.The research provided theoretical guidance for application of viscous dampers on curved girder bridges with different radius.
The 3D FE computational model of a curved rigid-continuous composite girder bridge was established,viscous dampers were set at the positions of sliding bearings.Considered the variation of radius of curvature,the effect of variation of radius of curvature on structural response and seismic mitigation effect of viscous dampers under three ground motions in three directions was analyzed.The results show that(1) the dynamic response of curved girder bridge without viscous dampers related to both radius of curvature and ground motion characteristics;(2) with viscous dampers,the internal force of control point increased when the radius of curvature increased under different ground motions;(3) the internal force of control point and seismic mitigation ratio of displacement of main girder due to viscous dampers decreased when the radius of curvature increased under different ground motions.The research provided theoretical guidance for application of viscous dampers on curved girder bridges with different radius.
引文
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[2]李国豪.桥梁结构稳定与振动[M].修订版.北京:中国铁道出版社,2002.LI Guohao.Stability and Vibration of Bridge Structure[M].Rev.ed.Beijing:China Railway PublishingHouse,2002.
[3]邵容光,夏淦.混凝土弯梁桥[M].北京:人民交通出版社,1994.SHAO Rongguang,XIA Gan.Curved Concrete GirderBridge[M].Beijing:China CommunicationsPress,1994.
[4]胡大琳.桥涵工程试验检测技术[M].北京:人民交通出版社,2004.HU Dalin.Test Detection Technology of BridgeEngineering[M].Beijing:China CommunicationsPress,2004.
[5]LJIMA K,OBIYA H,ARAMAKI G,et al.A Study onPreventing the Fall of Skew and Curved Bridge Decks byUsing Rubber Bearings[J].Structural Engineering andMechanics,2001,12(4):347-362.
[6]陈永祁,杜义新.液体粘滞阻尼器在结构工程中的最新进展[J].工程抗震与加固改造,2006,28(3):65-72.CHEN Yongqi,DU Yixin.Latest Development of the FluidViscous Damper in Civil Engineering[J].EarthquakeResistant Engineering and Retrofitting,2006,28(3):65-72.
[7]赵国栋.斜拉桥地震反应分析与减震设计[D].北京:北京交通大学,2008.ZHAO Guodong.Earthquake Response Analysis andSeismic Mitigation Design of Cable-stayed Bridge[D].Beijing:Beijing Jiaotong University,2008.
[8]朱浩.粘滞阻尼器在斜拉桥减震设计中的应用[D].西安:长安大学,2005.ZHU Hao.Application of Viscous Dampers on SeismicMitigation Design of Cable-stayed Bridge[D].Xi'an:Chang'an University,2005.
[9]范立础,王志强.桥梁减隔震设计[M].北京:人民交通出版社,2001.FAN Lichu,WANG Zhiqiang.Seismic Absorption andIsolation Design for Bridges[M].Beijing:ChinaCommunications Press,2001.
[10]亓兴军,吴玉华.曲线连续梁桥的磁流变阻尼器减震控制[J].公路交通科技,2011,28(9):81-88.QI Xingjun,WU Yuhua.Seismic Mitigation Control forCurved Continuous Girder Bridge with MagnetorheologicalDampers[J].Journal of Highway and TransportationResearch and Development,2011,28(9):81-88.
[11]单德山,李乔.铁路曲线梁桥抗震设计分析[J].重庆交通学院学报,2005,24(1):1-4.SHAN Deshan,LI Qiao.Study of Aseismic Design forRailway Curved-girder Bridges[J].Journal of ChongqingJiaotong University,2005,24(1):1-4.
[12]胡聿贤.地震工程学[M].北京:地震出版社,2006.HU Yuxian.Earthquake Engineering[M].Beijing:Earthquake Press,2006.
[13]JTG/T B02-01—2008,公路桥梁抗震设计细则[S].JTG/T B02-01—2008,Guidelines for Seismic Design ofHighway Bridges[S].
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