大跨三塔悬索桥伸缩缝处纵向碰撞对结构地震反应的影响
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摘要
针对大跨桥梁在地震作用下伸缩缝处的碰撞现象,以一座大跨3塔悬索桥为例,建立了考虑塔、墩弹塑性的空间非线性碰撞模型,采用非线性时程法研究了地震作用下伸缩缝处碰撞对结构地震响应的影响。分析结果表明:当引桥振动基本周期大于主桥位移控制振型周期时,碰撞可能使引桥墩底、主引桥相对位移及引桥梁体搭接长度响应地震增大,且随着主桥和引桥位移控制振型周期差异逐渐增大,碰撞效应总体上对主桥的地震响应影响较小。
Based on the pounding phenomenon at expansion joints of long-span bridge under earthquake and in combination with a realistic engineering project of a long-span triple-pylon suspension bridge,the complex 3D nonlinear pounding model that considered elastoplastic character of pylon and piers was developed.The pounding effects on seismic responses of the main span and the approach span were studied by using nonlinear time history method.The results indicate that(1) as the vibration period of the approach span is longer than the control vibration period of displacement of the main span,the pounding could amplify the seismic responses of relative displacement between bottoms of piers of the approach span and main span as well as the hinge seat width of beam of approach span,and the effects increased gradually with the difference of control vibration period of relative displacement between main span and approach span increases;(2) the pounding has light effect on seismic responses of the main span.
Based on the pounding phenomenon at expansion joints of long-span bridge under earthquake and in combination with a realistic engineering project of a long-span triple-pylon suspension bridge,the complex 3D nonlinear pounding model that considered elastoplastic character of pylon and piers was developed.The pounding effects on seismic responses of the main span and the approach span were studied by using nonlinear time history method.The results indicate that(1) as the vibration period of the approach span is longer than the control vibration period of displacement of the main span,the pounding could amplify the seismic responses of relative displacement between bottoms of piers of the approach span and main span as well as the hinge seat width of beam of approach span,and the effects increased gradually with the difference of control vibration period of relative displacement between main span and approach span increases;(2) the pounding has light effect on seismic responses of the main span.
引文
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[9]邓育林,彭天波,李建中.大跨多塔悬索桥纵向地震碰撞反应参数研究[J].振动与冲击,2011,30(4):152-157.DENG Yulin,PENG Tianbo,LI Jianzhong.ParametricStudy of Longitudinal Seismic Pounding Response for aLong-span Multi-tower Suspension Bridges[J].Journal ofVibration and Shock,2011,30(4):152-157.
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[12]MENEGOTTO M,PINTO P E.Method of Analysis forCyclically Loaded Reinforced Concrete Plane FramesIncluding Changes in Geometry and Non-Elastic Behaviorof Elements under Combined Normal Force and Bending[C]∥Proceedings of IABSE Symposium on Resistanceand Ultimate Deformability of Structures.Lisbon:International Association for Bridge and StructuralEngineering,1973:15-22.
[13]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 Compactbetween Rods[J].Engineering Mechanics,2004,21(2):157-166.
[2]NAWAWI C,HONG H.Study of SSI and Non-uniformGround Motion effect on Pounding between Bridge Girders[J].Soil Dynamics and Earthquake Engineering,2005,25:717-728.
[3]ROBERT J,KRZYSZTOF W,YOZO F.Reduction ofPounding Effects in Elevated Bridges during Earthquakes[J].Earthquake Engineering and Structural Dynamics,2000,29:195-212.
[4]ANAT R,KAZUHIKO K.Relative DisplacementResponse Spectra with Pounding Effect[J].EarthquakeEngineering and Structural Dynamics,2001,30:1511-1538.
[5]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,2006,30(1):54-59.WANG Junwen,LI Jianzhong,FAN Lichu.Effect ofPounding at Expansion Joints on Seismic Response ofIrregular Girder Bridges[J].China Civil EngineeringJournal,2006,30(1):54-59.
[6]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.
[7]TAUCER F F,ENRICO S.Fiber Beam-column Model forSeismic Response Analysis of Reinforced ConcreteStructures,EERC Report 91-17[R].Berkeley:Earthquake Engineering Research Center,University ofCalifornia,1991.
[8]CHAU K T,WEI X X,GUO X,et al.Experimental andTheoretical Simulations of Seismic Poundings between TwoAdjacent Structures[J].Earthquake Engineering andStructural Dynamics,2003,32:537-554.
[9]邓育林,彭天波,李建中.大跨多塔悬索桥纵向地震碰撞反应参数研究[J].振动与冲击,2011,30(4):152-157.DENG Yulin,PENG Tianbo,LI Jianzhong.ParametricStudy of Longitudinal Seismic Pounding Response for aLong-span Multi-tower Suspension Bridges[J].Journal ofVibration and Shock,2011,30(4):152-157.
[10]KENT D C,PARK R.Flexural Members with ConfinedConcrete[J].Journal of the Structural Division,ASCE,1971,97(7):1969-1990.
[11]FILIPPOU.A Simple Model for Reinforcing BarAnchorages under Cyclic Excitations[J].Journal of theStructural Division,ASCE,1986,112(7):1639-1659.
[12]MENEGOTTO M,PINTO P E.Method of Analysis forCyclically Loaded Reinforced Concrete Plane FramesIncluding Changes in Geometry and Non-Elastic Behaviorof Elements under Combined Normal Force and Bending[C]∥Proceedings of IABSE Symposium on Resistanceand Ultimate Deformability of Structures.Lisbon:International Association for Bridge and StructuralEngineering,1973:15-22.
[13]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 Compactbetween Rods[J].Engineering Mechanics,2004,21(2):157-166.
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