行波输入下连续梁桥纵向墩梁相对位移碰撞效应分析
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摘要
结合多跨连续梁桥的结构特点,提出了一种能模拟联间碰撞行为的连续梁桥碰撞分析模型。用非线性时程方法对行波输入下连续梁桥的地震碰撞反应进行了参数分析。结果表明:相邻联的周期比对短周期联位移的碰撞效应较大,考虑地震行波输入时伸缩缝处的碰撞效应可能会大幅度增大墩梁的相对位移,从而增大了地震作用下发生落梁的风险;墩梁相对位移随滑动支座摩阻系数的增大而减小。最后提出用一个碰撞效应增大系数来考虑连续梁桥相互碰撞对墩梁相对位移的影响,利用碰撞效应增大系数的概念为连续梁桥防止落梁的设计提供了一个新的思路。
Based on the characteristics of multispan continuous girder bridges,an analytical model simulating pounding behavior of continuous girder bridge was developed.The parametrical analysis of the pounding phenomenon associated with longitudinal excitation of traveling seismic wave was carried out by using the nonlinear time-history girder analysis method.The results show that the period ratio of adjacent girder has more effect on pounding response of short period segments,the relative displacements between adjacent bridge piers and girders is obviously increased considering the effects of pounding and of traveling seismic waves,which may even cause bridge girder to drop from piers and collapse;The relative displacements between adjacent bridge piers and girders decrease with increase of the coefficient of friction.In order to consider the effects of pounding on the seismic relative displacement responses,the pounding effect amplification factor of the relative displacement between the top of the transitional pier and the girder was introduced;The concept of the pounding effect amplification factor provides a new idea of the anti-girder drop bridge design.
Based on the characteristics of multispan continuous girder bridges,an analytical model simulating pounding behavior of continuous girder bridge was developed.The parametrical analysis of the pounding phenomenon associated with longitudinal excitation of traveling seismic wave was carried out by using the nonlinear time-history girder analysis method.The results show that the period ratio of adjacent girder has more effect on pounding response of short period segments,the relative displacements between adjacent bridge piers and girders is obviously increased considering the effects of pounding and of traveling seismic waves,which may even cause bridge girder to drop from piers and collapse;The relative displacements between adjacent bridge piers and girders decrease with increase of the coefficient of friction.In order to consider the effects of pounding on the seismic relative displacement responses,the pounding effect amplification factor of the relative displacement between the top of the transitional pier and the girder was introduced;The concept of the pounding effect amplification factor provides a new idea of the anti-girder drop bridge design.
引文
[1]黄勇.汶川地震中梁式桥的震害和预防震害的新方法[J].地震工程与工程振动,2008,28(5),20-26.Huang Yong.The performance of girder bridges in Wenchuan Earthquake and a new method for seismic protection[J].Journal of Earthquake En-gineering and Engineering Vibration,2008,28(5),20-26.
[2]高玉峰,蒲黔辉,李晓斌.梁式桥地震碰撞响应及防碰撞与落梁措施研究进展[J].地震工程与工程振动,2011,31(1),80-88.GAO Yufeng,PU Qianhui,LI Xiaobin.State-of-arts of earthquake-induced pounding responses of girder bridges and measures for preventingpounding and span collapse[J].Journal of Earthquake Engineering and Engineering Vibration,2011,31(1),80-88.
[3]王军文,李建中,范立础.桥梁结构地震碰撞效应及防落梁措施研究现状[J].公路交通科技,2007,24(5),71-75.WANG Junwen,LI Jianzhong,FAN Lichu.State of art of current studies on the effect of seismic Induced pounding between adjacent bridge decksand falling-off prevention measures[J].Journal of Highway and Transportation Research and Development,2007,24(5),71-75.
[4]DesRoches R,Muthukumar S.Effect of pounding and restrainers on seismic response of multipule-frame bridges[J].Journal of Structural Engi-neering,2002 128(7):860-869.
[5]Praveen K.Malhotra.Dynamics of seismic pounding at expansion joints of concrete bridges[J].Journal of Engineering Mechanics,1998,124(7):794―802.
[6]Robert Jankowski,Krzysztof Wilde,Yozo Fujino.Pounding of superstructure segments in isolated elevated bridge during earthquakes[J].Earth-quake Engineering and Structural Dynamics,1998,27:487-502.
[7]Dimitrakopoulos E,Makris N,Kappos A J.Dimensional analysis of the earthquake-induced pounding between adjacent structures[J].Earth-quake Engineering and Structural Dynamics,2009,38(7):867-886.
[8]高玉峰,蒲黔辉,李晓斌.考虑碰撞效应的双柱式高墩桥梁非线性地震反应特性研究[J].公路交通科技,2011,28(4),36-45.GAO Yufeng,PU Qianhui,LI Xiaobin.Nonlinear seismic response characteristics of bridge with double-column high-rise piers consideringpounding effect[J].Journal of Highway and Transportation Research and Development,2011,28(4),36-45.
[9]李建中,范立础.非规则梁桥纵向地震反应及碰撞效应[J].土木工程学报,2005,38(1):84-90.Li Jianzhong,Fan Lichu.Longitudinal seismic response and pounding effects of girder bridges with unconventional configurations[J].China CivilEngineering Journal,2005,38(1):84-90.
[10]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 during earthquake[J].Engineering Me-chanics,2008,25(4),128-133.
[11]Anxin Guo,Zhongjun Li,Hui Li,et al.Experimental and analytical study on pounding reduction of base-isolated highway bridges using MRdampers[J].Earthquake Engineering and Structural Dynamics,2009,38(11):1307-1333.
[12]邓育林,彭天波,李建中.强震作用下大跨斜拉桥伸缩缝处碰撞效应的影响研究[J].振动与冲击,2011,30(6):26-30.DENG Yulin,PENG Tianbo,LI Jianzhong.Effect of pounding at expansion joints on seismic response of long-span cable-stayed bridge understrong earthquake[J].Journal of Vibration and Shock,2011,30(6):26-30.
[13]徐略勤,李建中,吴陶晶.碰撞效应对非规则梁桥横向地震反应的影响[J].振动与冲击,2011,30(4):95-99.XU Lueqin,LI Jianzhong,WU Taojing.Influence of pounding effects on transverse seismic response of a nonstandard girder bridge[J].Journal ofVibration and Shock,2011,30(4):95-99.
[14]李黎,叶志雄,吴璟.隔震连续梁桥地震作用下梁间碰撞响应的研究[J].公路交通科技,2009,26(7),100-104.LI Li,YE Zhixiong,WU Jing.Analysis on Seismic Pounding Responses of Isolated Continuous Girder Bridge under Earthquake Excitation[J].Journal of Highway and Transportation Research and Development,2009,26(7),100-104.
[15]王斌斌,叶爱君.地震作用下大跨度斜拉桥和引桥间碰撞分析[J].振动与冲击,2010,29(3):95-99.WANG Binbin,YE Aijun.Pounding effects between long-span cable-stayed bridge and its approach bridges under earthquake[J].Journal ofVibration and Shock,2011,30(6):26-30.
[16]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 girders during earthquakes based on col-linear impact between rods[J].Engineering Mechanics,2004,21(2),157-166.
[2]高玉峰,蒲黔辉,李晓斌.梁式桥地震碰撞响应及防碰撞与落梁措施研究进展[J].地震工程与工程振动,2011,31(1),80-88.GAO Yufeng,PU Qianhui,LI Xiaobin.State-of-arts of earthquake-induced pounding responses of girder bridges and measures for preventingpounding and span collapse[J].Journal of Earthquake Engineering and Engineering Vibration,2011,31(1),80-88.
[3]王军文,李建中,范立础.桥梁结构地震碰撞效应及防落梁措施研究现状[J].公路交通科技,2007,24(5),71-75.WANG Junwen,LI Jianzhong,FAN Lichu.State of art of current studies on the effect of seismic Induced pounding between adjacent bridge decksand falling-off prevention measures[J].Journal of Highway and Transportation Research and Development,2007,24(5),71-75.
[4]DesRoches R,Muthukumar S.Effect of pounding and restrainers on seismic response of multipule-frame bridges[J].Journal of Structural Engi-neering,2002 128(7):860-869.
[5]Praveen K.Malhotra.Dynamics of seismic pounding at expansion joints of concrete bridges[J].Journal of Engineering Mechanics,1998,124(7):794―802.
[6]Robert Jankowski,Krzysztof Wilde,Yozo Fujino.Pounding of superstructure segments in isolated elevated bridge during earthquakes[J].Earth-quake Engineering and Structural Dynamics,1998,27:487-502.
[7]Dimitrakopoulos E,Makris N,Kappos A J.Dimensional analysis of the earthquake-induced pounding between adjacent structures[J].Earth-quake Engineering and Structural Dynamics,2009,38(7):867-886.
[8]高玉峰,蒲黔辉,李晓斌.考虑碰撞效应的双柱式高墩桥梁非线性地震反应特性研究[J].公路交通科技,2011,28(4),36-45.GAO Yufeng,PU Qianhui,LI Xiaobin.Nonlinear seismic response characteristics of bridge with double-column high-rise piers consideringpounding effect[J].Journal of Highway and Transportation Research and Development,2011,28(4),36-45.
[9]李建中,范立础.非规则梁桥纵向地震反应及碰撞效应[J].土木工程学报,2005,38(1):84-90.Li Jianzhong,Fan Lichu.Longitudinal seismic response and pounding effects of girder bridges with unconventional configurations[J].China CivilEngineering Journal,2005,38(1):84-90.
[10]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 during earthquake[J].Engineering Me-chanics,2008,25(4),128-133.
[11]Anxin Guo,Zhongjun Li,Hui Li,et al.Experimental and analytical study on pounding reduction of base-isolated highway bridges using MRdampers[J].Earthquake Engineering and Structural Dynamics,2009,38(11):1307-1333.
[12]邓育林,彭天波,李建中.强震作用下大跨斜拉桥伸缩缝处碰撞效应的影响研究[J].振动与冲击,2011,30(6):26-30.DENG Yulin,PENG Tianbo,LI Jianzhong.Effect of pounding at expansion joints on seismic response of long-span cable-stayed bridge understrong earthquake[J].Journal of Vibration and Shock,2011,30(6):26-30.
[13]徐略勤,李建中,吴陶晶.碰撞效应对非规则梁桥横向地震反应的影响[J].振动与冲击,2011,30(4):95-99.XU Lueqin,LI Jianzhong,WU Taojing.Influence of pounding effects on transverse seismic response of a nonstandard girder bridge[J].Journal ofVibration and Shock,2011,30(4):95-99.
[14]李黎,叶志雄,吴璟.隔震连续梁桥地震作用下梁间碰撞响应的研究[J].公路交通科技,2009,26(7),100-104.LI Li,YE Zhixiong,WU Jing.Analysis on Seismic Pounding Responses of Isolated Continuous Girder Bridge under Earthquake Excitation[J].Journal of Highway and Transportation Research and Development,2009,26(7),100-104.
[15]王斌斌,叶爱君.地震作用下大跨度斜拉桥和引桥间碰撞分析[J].振动与冲击,2010,29(3):95-99.WANG Binbin,YE Aijun.Pounding effects between long-span cable-stayed bridge and its approach bridges under earthquake[J].Journal ofVibration and Shock,2011,30(6):26-30.
[16]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 girders during earthquakes based on col-linear impact between rods[J].Engineering Mechanics,2004,21(2),157-166.
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