双向隔震铁路桥梁与列车的耦合振动响应研究
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摘要
为了研究铅芯橡胶双向隔震铁路桥梁在列车荷载作用下的动力性能,本文首先建立一座三跨隔震桥梁三维模型,然后对双向隔震铁路桥梁和列车组成的车桥系统耦合振动进行分析,研究其机理.结果表明,隔震桥梁在横桥向的隔震周期越大,桥梁梁体在列车荷载作用下横桥向位移越大,支座阻尼对桥梁梁体横桥向水平振动的衰减作用更加明显,对桥梁上部结构扭转角和竖向位移的影响可以忽略不计.桥梁横桥向的隔震周期的增大,使车体横摆、侧滚振动位移响应更加剧烈,对车体各个自由度的加速度响应影响可以忽略不计;隔震支座阻尼的增大对车体横摆、侧滚角、摇头角、沉浮和点头角位移响应以及对车体各自由度的加速度响应影响较小.
In order to research the dynamic performance of a railway bridge with bidirectional lead rubber seismic isolation bearings under train load,a three spans bridge was established with ANSYS.The coupling vibration mechanism was studied between bridge and train.The results show that,the transverse displacement increases with the isolation period of transverse increase.The bearing damp attenuates the horizontal vibration and has little action on the tensional and vertical displacement.The transverse wiggle,side rolling and vertical displacement change little with the transverse seismic period increase.The bearing damping has little influence on the transverse wiggle,side rolling angle,shaking angle,up and down displacement,nodding angle displacement and acceleration response of each degree of freedom.
In order to research the dynamic performance of a railway bridge with bidirectional lead rubber seismic isolation bearings under train load,a three spans bridge was established with ANSYS.The coupling vibration mechanism was studied between bridge and train.The results show that,the transverse displacement increases with the isolation period of transverse increase.The bearing damp attenuates the horizontal vibration and has little action on the tensional and vertical displacement.The transverse wiggle,side rolling and vertical displacement change little with the transverse seismic period increase.The bearing damping has little influence on the transverse wiggle,side rolling angle,shaking angle,up and down displacement,nodding angle displacement and acceleration response of each degree of freedom.
引文
[1]GHOSH G,SINGH Y.Bidirectional effects on the response ofan isolated bridge[J].International Journal of Recent Trendsin Engineering,2009,1(6):6-10.
[2]HUANG W H.Bidirectional testing,modeling,and systemresponse of seismically isolated bridges[D].Berkeley:Dept ofCivil and Einvironmental Engineering,University of California,2002.
[3]KUNDE M C,JANGID R S.Seismic behavior of isolatedbridges:A-state-of-the-art review[J].Electronic Journal ofStructural Engineering,2003,3(2):140-169.
[4]钟铁毅,杨风利,吴彬.铅芯橡胶支座隔震铁路简支梁桥双向地震响应分析[J].中国铁道科学,2007(3):38-43.ZHONG Tie-yi,YANG Feng-li,WU Bin.Analysis of the bi-directional seismic responses for seismically isolated railwaysimple supported beam bridge by Lead Rubber Bearing[J].China Railway Science,2007(3):38-43.(In Chinese)
[5]吴彬.铅芯橡胶支座力学性能及其在桥梁工程中减隔震应用的研究[D].北京:铁道科学研究院,2003.WU Bin.Study on mechanical characteristic of lead-rubberbearing and the response of isolated bridge with the lead-rub-ber bearing[D].Beijing:China Academy of Railway Sciences,2003.(In Chinese)
[6]夏禾.车辆与结构动力相互作用[M].2版.北京:科学出版社,2005:154-171.XIA He.Dynamic interaction of vehicles and structures[M].2 release.Beijing:Science Press,2005:154-171.(In Chinese)
[7]范立础.桥梁减隔震设计[M].北京:人民交通出版社,2001:166-177.FAN Li-chu.Seismic isolation design of bridges[M].Beijing:China Communications Press,2001:166-177.(In Chinese)
[8]钟铁毅,杨风利,夏禾.基于能量法的铅芯橡胶支座隔震桥梁设计方法[J].中国铁道科学,2009(2):43-48.ZHONG Tie-yi,YANG Feng-li,XIA He.The design methodof the seismically isolated bridge by lead rubber bearing basedon energy method[J].China Railway Science,2009(2):43-48.(In Chinese)
[2]HUANG W H.Bidirectional testing,modeling,and systemresponse of seismically isolated bridges[D].Berkeley:Dept ofCivil and Einvironmental Engineering,University of California,2002.
[3]KUNDE M C,JANGID R S.Seismic behavior of isolatedbridges:A-state-of-the-art review[J].Electronic Journal ofStructural Engineering,2003,3(2):140-169.
[4]钟铁毅,杨风利,吴彬.铅芯橡胶支座隔震铁路简支梁桥双向地震响应分析[J].中国铁道科学,2007(3):38-43.ZHONG Tie-yi,YANG Feng-li,WU Bin.Analysis of the bi-directional seismic responses for seismically isolated railwaysimple supported beam bridge by Lead Rubber Bearing[J].China Railway Science,2007(3):38-43.(In Chinese)
[5]吴彬.铅芯橡胶支座力学性能及其在桥梁工程中减隔震应用的研究[D].北京:铁道科学研究院,2003.WU Bin.Study on mechanical characteristic of lead-rubberbearing and the response of isolated bridge with the lead-rub-ber bearing[D].Beijing:China Academy of Railway Sciences,2003.(In Chinese)
[6]夏禾.车辆与结构动力相互作用[M].2版.北京:科学出版社,2005:154-171.XIA He.Dynamic interaction of vehicles and structures[M].2 release.Beijing:Science Press,2005:154-171.(In Chinese)
[7]范立础.桥梁减隔震设计[M].北京:人民交通出版社,2001:166-177.FAN Li-chu.Seismic isolation design of bridges[M].Beijing:China Communications Press,2001:166-177.(In Chinese)
[8]钟铁毅,杨风利,夏禾.基于能量法的铅芯橡胶支座隔震桥梁设计方法[J].中国铁道科学,2009(2):43-48.ZHONG Tie-yi,YANG Feng-li,XIA He.The design methodof the seismically isolated bridge by lead rubber bearing basedon energy method[J].China Railway Science,2009(2):43-48.(In Chinese)
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