铁路隔震连续梁桥地震碰撞响应研究
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摘要
在地震作用下隔震桥梁的梁体位移比非隔震桥梁明显增加,使得相邻梁发生碰撞的概率增大。以1联3跨铁路隔震连续梁桥为例,选用3条人工地震波,采用非线性时程分析方法进行该桥的碰撞响应分析,研究梁间伸缩缝宽度和隔震支座刚度对梁间碰撞响应的影响。结果表明:随着伸缩缝宽度的增大和隔震支座刚度的增大,相邻梁碰撞的发生次数和碰撞力均有明显减小;地震作用下隔震固定墩墩底最大弯矩和最大剪力均随着隔震支座刚度的增加而增加。因此,在进行隔震桥梁设计时,应综合考虑隔震支座的隔震效果和碰撞响应,从而得到既经济又安全的隔震桥梁设计参数。
The beam displacement of seismically isolated bridge is much larger than that of non-isolated bridge under earthquakes,which increases the possibility of pounding between adjacent beams.The pounding responses of a 3-span seismically isolated railway continuous beam bridge were calculated and analyzed subjected to three artificial earthquake waves using nonlinear time history method.The influences of expansion joint widths between beams and the stiffness of isolation bearings on pounding responses were studied.The results show that both the pounding times and pounding forces are reduced obviously with the increase of expansion joint widths and the stiffness of isolation bearings.The peak bending moment and peak shear force at the bottom of the seismic isolation fixed pier are enhanced with the increase of the stiffness of isolation bearings.Thus,in the design of seismically isolated bridge,the isolation efficiency and pounding responses between beams should be considered comprehensively to achieve the safe and economic design parameters for seismically isolated bridges.
The beam displacement of seismically isolated bridge is much larger than that of non-isolated bridge under earthquakes,which increases the possibility of pounding between adjacent beams.The pounding responses of a 3-span seismically isolated railway continuous beam bridge were calculated and analyzed subjected to three artificial earthquake waves using nonlinear time history method.The influences of expansion joint widths between beams and the stiffness of isolation bearings on pounding responses were studied.The results show that both the pounding times and pounding forces are reduced obviously with the increase of expansion joint widths and the stiffness of isolation bearings.The peak bending moment and peak shear force at the bottom of the seismic isolation fixed pier are enhanced with the increase of the stiffness of isolation bearings.Thus,in the design of seismically isolated bridge,the isolation efficiency and pounding responses between beams should be considered comprehensively to achieve the safe and economic design parameters for seismically isolated bridges.
引文
[1]MARAGAKIS E,DOUGLAS B,VRONTINOS S.Classical Formulation of the Impact between Bridge Deck and A-butments during Strong Earthquake[C]//SHAMIM A Sheikh,S M Uzumeri.Proceedings of the 6th Canadian Con-ference on Earthquake Engineering.Toronto:University of Toronto Press,1991:205-212.
[2]HAO Hong.A Parametric Study of the Required Seating Length for Bridge Decks during Earthquake[J].Earth-quake Engineering and Structural Dynamics,1998,27(1):91-103.
[3]RUANGRASSAMEE A,KAWASHIMA K.Relative Displacement Response Spectra with Pounding Effect[J].Earthquake Engineering and Structural Dynamics,2001,30(10):1511-1538.
[4]王军文,李建中,范立础.非规则梁桥伸缩缝处的碰撞对地震反应的影响[J].土木工程学报,2006,29(1):54-59.(WANG Junwen,LI Jianzhong,FAN Lichu.Effect of Pounding at Expansion Joints on Seismic Response of Irregu-lar Girder Bridges[J].China Civil Engineering Journal,2006,29(1):54-59.in Chinese)
[5]王军文,张运波,李建中,等.地震动行波效应对连续梁桥纵向地震碰撞反应的影响[J].工程力学,2007,24(11):100-105.(WANG Junwen,ZHANG Yunbo,LI Jianzhong,et al.Seismic Wave Passage Effect’s Influences on LongitudinalSeismic Pounding Response for Continuous Girder Bridges[J].Engineering Mechanics,2007,24(11):100-105.inChinese)
[6]李忠献,岳福青,周莉,等.基于随机振动理论确定桥梁地震碰撞的临界间隙[J].地震工程与工程振动,2006,26(4):156-161.(LI Zhongxian,YUE Fuqing,ZHOU Li,et al.Determination of Critical Gap Length of Seismic Pounding for Bridg-es Based on Random Vibration Theory[J].Earthquake Engineering and Engineering Vibration,2006,26(4):156-161.in Chinese)
[7]李忠献,周莉,岳福青.城市桥梁粘滞阻尼器防地震碰撞分析与参数设计[J].地震工程与工程振动,2006,26(5):195-200.(LI Zhongxian,ZHOU Li,YUE Fuqing.Seismic Pounding Prevention Analysis and Parametric Design of UrbanBridges Using Viscous Damper[J].Earthquake Engineering and Engineering Vibration,2006,26(5):195-200.inChinese)
[8]李忠献,岳福青,周莉.地震时桥梁碰撞分析的等效Kelvin撞击模型[J].工程力学,2008,25(4):128-133.(LI Zhongxian,YUE Fuqing,ZHOU Li.Equivalent Kelvin Impact Model for Pounding Analysis of Bridges duringEarthquake[J].Engineering Mechanics,2008,25(4):128-133.in Chinese)
[9]陈学喜,朱晞,高学奎.地震作用下桥梁梁体间的碰撞响应分析[J].中国铁道科学,2005,26(6),75-79.(CHEN Xuexi,ZHU Xi,GAO Xuekui.Analysis on the Pounding Responses between Adjacent Bridge Beams underEarthquakes[J].China Railway Science,2005,26(6),75-79.in Chinese)
[10]孟宪峰,朱晞.近场地震作用下高速铁路简支梁桥的碰撞行为[J].北京交通大学学报,2006,30(4):73-76.(MENG Xianfeng,ZHU Xi.Pounding Behavior of High-Speed Railway Simple Supported Bridges under the Near-Fault Earthquakes[J].Journal of Beijing Jiaotong University,2006,30(4):73-76.in Chinese)
[11]王东升,冯启民,王国新.基于直杆共轴碰撞理论的桥梁地震反应邻梁碰撞分析模型[J].工程力学,2004,21(2):157-166.(WANG Dongsheng,FENG Qimin,WANG Guoxin.Analysis Model of Pounding between Adjacent Bridge Girdersduring Earthquakes Based on Collinear Impact between Rods[J].Engineering Mechanics,2004,21(2):157-166.in Chinese)
[12]龚万江,保石才,刘维娟.地震作用下高墩连续T形梁桥梁端碰撞分析[J].世界地震工程,2009,25(3):187-192.(GONG Wanjiang,BAO Shicai,LIU Weijuan.Analysis on the Impact Simulation between Adjacent Girders of aHigh-Pier Continuous T Shaped-Beam Bridge under Earthquakes[J].World Information on Earthquake Engineering,2009,25(3):187-192.in Chinese)
[13]PRAVEEN K Malhotra.Dynamics of Seismic Pounding at Expansion Joints of Concrete Bridges[J].Journal of En-gineering Mechanics,1998,124(7):794-802.
[2]HAO Hong.A Parametric Study of the Required Seating Length for Bridge Decks during Earthquake[J].Earth-quake Engineering and Structural Dynamics,1998,27(1):91-103.
[3]RUANGRASSAMEE A,KAWASHIMA K.Relative Displacement Response Spectra with Pounding Effect[J].Earthquake Engineering and Structural Dynamics,2001,30(10):1511-1538.
[4]王军文,李建中,范立础.非规则梁桥伸缩缝处的碰撞对地震反应的影响[J].土木工程学报,2006,29(1):54-59.(WANG Junwen,LI Jianzhong,FAN Lichu.Effect of Pounding at Expansion Joints on Seismic Response of Irregu-lar Girder Bridges[J].China Civil Engineering Journal,2006,29(1):54-59.in Chinese)
[5]王军文,张运波,李建中,等.地震动行波效应对连续梁桥纵向地震碰撞反应的影响[J].工程力学,2007,24(11):100-105.(WANG Junwen,ZHANG Yunbo,LI Jianzhong,et al.Seismic Wave Passage Effect’s Influences on LongitudinalSeismic Pounding Response for Continuous Girder Bridges[J].Engineering Mechanics,2007,24(11):100-105.inChinese)
[6]李忠献,岳福青,周莉,等.基于随机振动理论确定桥梁地震碰撞的临界间隙[J].地震工程与工程振动,2006,26(4):156-161.(LI Zhongxian,YUE Fuqing,ZHOU Li,et al.Determination of Critical Gap Length of Seismic Pounding for Bridg-es Based on Random Vibration Theory[J].Earthquake Engineering and Engineering Vibration,2006,26(4):156-161.in Chinese)
[7]李忠献,周莉,岳福青.城市桥梁粘滞阻尼器防地震碰撞分析与参数设计[J].地震工程与工程振动,2006,26(5):195-200.(LI Zhongxian,ZHOU Li,YUE Fuqing.Seismic Pounding Prevention Analysis and Parametric Design of UrbanBridges Using Viscous Damper[J].Earthquake Engineering and Engineering Vibration,2006,26(5):195-200.inChinese)
[8]李忠献,岳福青,周莉.地震时桥梁碰撞分析的等效Kelvin撞击模型[J].工程力学,2008,25(4):128-133.(LI Zhongxian,YUE Fuqing,ZHOU Li.Equivalent Kelvin Impact Model for Pounding Analysis of Bridges duringEarthquake[J].Engineering Mechanics,2008,25(4):128-133.in Chinese)
[9]陈学喜,朱晞,高学奎.地震作用下桥梁梁体间的碰撞响应分析[J].中国铁道科学,2005,26(6),75-79.(CHEN Xuexi,ZHU Xi,GAO Xuekui.Analysis on the Pounding Responses between Adjacent Bridge Beams underEarthquakes[J].China Railway Science,2005,26(6),75-79.in Chinese)
[10]孟宪峰,朱晞.近场地震作用下高速铁路简支梁桥的碰撞行为[J].北京交通大学学报,2006,30(4):73-76.(MENG Xianfeng,ZHU Xi.Pounding Behavior of High-Speed Railway Simple Supported Bridges under the Near-Fault Earthquakes[J].Journal of Beijing Jiaotong University,2006,30(4):73-76.in Chinese)
[11]王东升,冯启民,王国新.基于直杆共轴碰撞理论的桥梁地震反应邻梁碰撞分析模型[J].工程力学,2004,21(2):157-166.(WANG Dongsheng,FENG Qimin,WANG Guoxin.Analysis Model of Pounding between Adjacent Bridge Girdersduring Earthquakes Based on Collinear Impact between Rods[J].Engineering Mechanics,2004,21(2):157-166.in Chinese)
[12]龚万江,保石才,刘维娟.地震作用下高墩连续T形梁桥梁端碰撞分析[J].世界地震工程,2009,25(3):187-192.(GONG Wanjiang,BAO Shicai,LIU Weijuan.Analysis on the Impact Simulation between Adjacent Girders of aHigh-Pier Continuous T Shaped-Beam Bridge under Earthquakes[J].World Information on Earthquake Engineering,2009,25(3):187-192.in Chinese)
[13]PRAVEEN K Malhotra.Dynamics of Seismic Pounding at Expansion Joints of Concrete Bridges[J].Journal of En-gineering Mechanics,1998,124(7):794-802.
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