三维地震动作用下曲线连续梁桥减震控制研究
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摘要
为了减少双支承曲线梁桥的地震破坏效应,提出了利用液体粘滞阻尼器进行曲线梁桥减震控制的方法,建立曲线连续梁桥的空间有限元模型和动力仿真模型,在桥梁墩台活动支座部位设置切向和径向液体粘滞减震装置,输入三维地震动计算分析了桥梁主动控制、半主动控制和被动控制三种减震方法的减震效果。结果表明,曲线梁桥的地震反应表现出显著的纵桥向与横桥向的耦合特性,在减震控制计算时必须同时输入三维地震动并设置纵横向减震装置。粘滞阻尼器能够控制曲线梁桥内外墩的内力趋于接近,三种减震控制方法均能有效地减小曲线梁桥的梁端位移和固定墩墩底内力,且三种方法的减震效果和地震反应时程的差别均相对较小,主动控制和半主动控制没有表现出明显的优越性,建议在实际曲线梁桥的抗震减震设计中应用粘滞阻尼器被动控制。
In order to reduce seismic damage effect of a curved girder bridge with double supports,the seismic response mitigation control technique with liquid viscous dampers was presented.The spatial finite element model and dynamic simulation model of a curved continuous girder bridge were established,and viscous dampers were set at the kinetic bearings of piers in tangent and radial orientations.Seismic mitigation effectiveness of active control,semi-active control and passive control for the bridge was calculated and analyzed with three-dimensional(3-D) ground motion input.The results indicated that the curved girder bridge has distinct characteristic of seismic coupling between longitudinal and transversal orientations;three orientations of the ground motion must be input simultaneously and longitudinal and transversal dampers are set simultaneously when seismic mitigation responses are calculated;the viscous dampers can control internal forces of inside pier and outside pier to be close to each other;the three mitigation approaches can effectively reduce displacement of girder and internal force of fixed piers of the curved girder bridge;the differences of seismic mitigation effectiveness and seismic response time histories are smaller for the three mitigation approaches;active control and semi-active control have no obvious advantage,and the passive control with viscous dampers can be widely applied in actual seismic design of a curved girder bridge.
In order to reduce seismic damage effect of a curved girder bridge with double supports,the seismic response mitigation control technique with liquid viscous dampers was presented.The spatial finite element model and dynamic simulation model of a curved continuous girder bridge were established,and viscous dampers were set at the kinetic bearings of piers in tangent and radial orientations.Seismic mitigation effectiveness of active control,semi-active control and passive control for the bridge was calculated and analyzed with three-dimensional(3-D) ground motion input.The results indicated that the curved girder bridge has distinct characteristic of seismic coupling between longitudinal and transversal orientations;three orientations of the ground motion must be input simultaneously and longitudinal and transversal dampers are set simultaneously when seismic mitigation responses are calculated;the viscous dampers can control internal forces of inside pier and outside pier to be close to each other;the three mitigation approaches can effectively reduce displacement of girder and internal force of fixed piers of the curved girder bridge;the differences of seismic mitigation effectiveness and seismic response time histories are smaller for the three mitigation approaches;active control and semi-active control have no obvious advantage,and the passive control with viscous dampers can be widely applied in actual seismic design of a curved girder bridge.
引文
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[2]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.
[3]Ruiz Julian F D,Hayashikawa T,Obata T.Seismic performance of isolated curved steel viaducts equipped with deck unseating prevention cable restrainers[J].Journal of Constructional Steel Research,2007,63(2):237-253.
[4]Lei Y H,Chien Y L.Applications of LRB and FPS to3-Dcurved box bridges[J].Tamkang Journal of Science and Engineering,2004,7(1):17-28.
[5]亓兴军,李小军,唐晖.曲线桥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.
[6]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.
[7]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.
[8]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.
[9]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.
[10]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.
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