曲线连续梁桥的磁流变阻尼器减震控制
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摘要
建立双支承曲线连续梁桥的空间有限元模型和减震控制动力仿真模型,根据连续梁桥的支座布置在各活动支座的切向设置8组磁流变阻尼器,在纵桥向输入3种不同频谱特点的地震动,计算分析了曲线连续梁桥地震反应主动控制、半主动控制和被动控制方法的减震效果。结果表明,磁流变阻尼器能够有效地减小曲线梁桥的主梁切向位移和固定墩墩底的弯矩与扭矩。不同频谱特点地震动输入下磁流变阻尼器减震效果的差别较大,在设计曲线梁桥减震参数时需要合理选择地震动输入。总体上看,磁流变阻尼器主动控制、半主动控制和被动控制3种减震控制方法对于曲线连续梁桥大部分地震反应减震效果的差别较小,这可为简单易行的阻尼器耗能被动控制方法在曲线梁桥抗震减震设计中的广泛应用提供理论依据。
The finite element model and seismic mitigation control dynamic simulation model were established for curved continuous bridge with double supports.According to the arrangement of bearings of continuous bridge,eight magnetorheological dampers were set in the tangent orientation at active bearings.Three ground motions with different spectra were input in the longitudinal direction of curved bridge.Seismic mitigation effectiveness of seismic active control,semi-active control and passive control for curved continuous bridge was calculated and analyzed.The results indicate that(1) Magnetorheological dampers can effectively reduce tangent displacement of girder,bend moment and torsional moment of fixed pier's bottom.(2) Seismic mitigation effectiveness of magnetorheological dampers has great difference under ground motions of different frequency spectra.When designing seismic parameters of curved girder bridge,the ground motion input should be correctly selected.The three seismic mitigation control methods of magnetorheological dampers have a little difference to most seismic mitigation effectiveness of curved girder bridge.This can offer theoretical evidence for aboard application of simple passive energy dissipation control of dampers in the seismic design of curved girder bridge.
The finite element model and seismic mitigation control dynamic simulation model were established for curved continuous bridge with double supports.According to the arrangement of bearings of continuous bridge,eight magnetorheological dampers were set in the tangent orientation at active bearings.Three ground motions with different spectra were input in the longitudinal direction of curved bridge.Seismic mitigation effectiveness of seismic active control,semi-active control and passive control for curved continuous bridge was calculated and analyzed.The results indicate that(1) Magnetorheological dampers can effectively reduce tangent displacement of girder,bend moment and torsional moment of fixed pier's bottom.(2) Seismic mitigation effectiveness of magnetorheological dampers has great difference under ground motions of different frequency spectra.When designing seismic parameters of curved girder bridge,the ground motion input should be correctly selected.The three seismic mitigation control methods of magnetorheological dampers have a little difference to most seismic mitigation effectiveness of curved girder bridge.This can offer theoretical evidence for aboard application of simple passive energy dissipation control of dampers in the seismic design of curved girder bridge.
引文
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[2]MOHAMED W A,HAYASHIKAWA T,ALY A G,et al.Study on Seismic Response of Curved Viaduct Systems with Different Isolation Conditions under Great Earthquake Ground Motion[J].Journal of Structural Engineering,2003,49A(2):563-572.
[3]周绪红,戴鹏,狄谨.曲线PC箱梁桥隔震体系的非线性分析[J].中国公路学报,2008,21(1):65-70.ZHOU Xuhong,DAI Peng,DI Jin.Nonlinear Analysis of Curved Prestressed Concrete Box Girder Bridge withSeismic Isolation System[J].China Journal of Highway and Transport,2008,21(1):65-70.
[4]林凯.隔震曲线梁桥三维地震反应分析[D].武汉:华中科技大学,2007.LIN Kai.Three-dimensional Seismic Response Analysis of Seismically Isolated Curved Girder Bridges[D].Wuhan:Huazhong University of Science and Technology,2007.
[5]亓兴军,李小军,唐晖.曲线桥梁弯扭耦合减震半主动控制分析[J].公路交通科技,2006,23(9):54-57.QI Xingjun,LI Xiaojun,TANG Hui.Study on Semiactive Control of Seismic Bend Torsion Coupling for Curved Bridge[J].Journal of Highway and Transportation Research and Development,2006,23(9):54-57.
[6]全伟,李宏男.曲线桥多维多点地震激励半主动控制分析[J].工程力学,2009,26(3):79-85.QUAN Wei,LI Hongnan.Semi-active Control of Curved Bridge under Multi-component and Multi-support Earthquake[J].Engineering Mechanics,2009,26(3):79-85.
[7]全伟.大跨桥梁多维多点地震反应分析研究[D].大连:大连理工大学,2008.QUAN Wei.Seismic Analysis of Large-span Bridges Subjected to Multi-component and Multi-support Earthquake Excitations[D].Dalian:Dalian University of Technology,2008.
[8]欧进萍.结构振动控制:主动、半主动和智能控制[M].北京:科学出版社,2003 OU Jinping.Structural Vibration Control:Active,Semiactive and Intelligent Controls[M].Beijing:Science Press,2003.
[9]亓兴军.桥梁减震半主动控制研究[D].北京:中国地震局地球物理研究所,2006.QI Xingjun.Study on Seismic Semi-active Control for Bridges[D].Beijing:Institute of Geophysics of China Earthquake Administration,2006.
[10]亓兴军,李小军,唐晖.斜拉桥减震控制算法研究[J].铁道工程学报,2008,118(7):36-40.QI Xingjun,LI Xiaojun,TANG Hui.Research on the Seismic Mitigation Control Algorithm for Cable-stayed Bridge[J].Journal of Railway Engineering Society,2008,118(7):36-40.
[11]范立础.桥梁抗震[M].上海:同济大学出版社,1997.FAN Lichu.Seismic Design of Bridges[M].Shanghai:Tongji University Press,1997.
[12]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 for Railway Curve-girder Bridges[J].Journal of Chongqing Jiaotong University,2005,24(1):1-4.
[13]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.
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