伸缩缝间隙及纵向阻尼器对斜拉桥的碰撞影响
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摘要
针对目前国内关于斜拉桥伸缩缝间隙对斜拉桥地震响应影响规律的研究还不够深入和全面,以九江斜拉桥为分析对象,建立碰撞分析模型,不仅较为系统地分析了伸缩缝间隙对斜拉桥与引桥之间碰撞响应的影响规律,而且研究了伸缩缝间隙对斜拉桥关键截面内力和梁端纵向位移的影响情况,并与设置纵向阻尼器后的情况进行了对比分析。研究表明:伸缩缝间隙不仅对伸缩缝处的碰撞响应有较大影响,而且对引桥固定墩墩底弯矩、塔底弯矩及梁端纵向位移响应也有一定影响。设置纵向阻尼器不仅可以有效降低伸缩缝处的碰撞响应,而且对控制斜拉桥主桥关键截面的内力和位移响应均有较好的效果,是一种比较理想的斜拉桥减震措施。
It is not overall deeply about the research of influence regularity of expansion joint gap on cable-stayed bridge seismic response.Taken the Jiujiang river cable-stayed bridge for example,the collision analysis models were built,the regularity of influence of expansion joint gap on the collision between cable-stayed bridge and approach span was studied systematically,and the influences of expansion joint gap on key sectional force and beam end longitudinal displacement were researched.And then,the comparison of the situations pre and post setting damper was performed.The results show that the expansion joint gap not only has rather influence on cable-stayed seismic collision response at expansion joint,but also has some influence on approach span fixed pier bottom moment,pylon bottom moment and beam end longitudinal displacement.Setting longitudinal dampers not only can reduce the collision response at expansion joint effectively,but also can control the key sectional force and displacement response.It is a better shock absorption measure for cable-stayed bridge.
It is not overall deeply about the research of influence regularity of expansion joint gap on cable-stayed bridge seismic response.Taken the Jiujiang river cable-stayed bridge for example,the collision analysis models were built,the regularity of influence of expansion joint gap on the collision between cable-stayed bridge and approach span was studied systematically,and the influences of expansion joint gap on key sectional force and beam end longitudinal displacement were researched.And then,the comparison of the situations pre and post setting damper was performed.The results show that the expansion joint gap not only has rather influence on cable-stayed seismic collision response at expansion joint,but also has some influence on approach span fixed pier bottom moment,pylon bottom moment and beam end longitudinal displacement.Setting longitudinal dampers not only can reduce the collision response at expansion joint effectively,but also can control the key sectional force and displacement response.It is a better shock absorption measure for cable-stayed bridge.
引文
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[10]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):95-99,123.XU Lueqin,LI Jianzhong,WU Taojing.Influence ofPounding Effects on Transverse Seismic Response of aNonstandard Girder Bridge[J].Journal of Vibration andShock,2011,30(4):95-99,123.
[2]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 ofCurrent Studies on the Effect of Seismic Induced Poundingbetween Adjacent Bridge Decks and Falling-off PreventionMeasures[J].Journal of Highway and TransportationResearch and Development,2007,24(5):71-75.
[3]KIM S H,LEE S W,MHA H S.Dynamic Behaviors ofthe Bridge Considering Pounding and Friction Effects underSeismic Excitations[J].Structural Engineering andMechanics,2000,10(6):621-633.
[4]SAIDI M,MARAGAKIS E,FENG S.Parameters in BridgeRestrainer Design for Seismic Retrofit[J].Journal ofStructural Engineering,1996,122(1):61-68.
[5]IZUNO K,KOBAYASHI H,KAMATA K.DemandCapacity for Unseating Prevention Cable to Support FallingGirder[J].Proceedings of Japan Society of CivilEngineers,2001,668:319-324.
[6]CHAU K T,WEI X X.Pounding of Structures Modelledas Non-linear Impacts of Two Oscillators[J].EarthquakeEngineering&Structural Dynamics,2001,30(5):633-651.
[7]王军文,李建中,范立础.连续梁桥纵向地震碰撞反应参数研究[J].中国公路学报,2005,18(4):42-47.WANG Junwen,LI Jianzhong,FAN Lichu.ParametricStudy of Longitudinal Seismic PoundingResponse for Continuous Girder Bridges[J].ChinaJournal of Highway and Transport,2005,18(4):42-47.
[8]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 BridgeGirders during Earthquakes Based on Collinear Impactbetween Rods[J].Engineering Mechanics,2004,21(4):81-85.
[9]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 ofPounding at Expansion Joints on Seismic Response ofLong-span Cable-stayed Bridge under Strong Earthquake[J].Journal of Vibration and Shock,2011,30(6):26-30.
[10]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):95-99,123.XU Lueqin,LI Jianzhong,WU Taojing.Influence ofPounding Effects on Transverse Seismic Response of aNonstandard Girder Bridge[J].Journal of Vibration andShock,2011,30(4):95-99,123.
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