非规则梁桥纵向地震反应及碰撞效应
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摘要
针对我国西部山区典型的非规则梁式桥梁 ,采用非线性时程地震反应分析方法 ,探讨了纵向地震作用下非规则梁桥相邻联的非同向振动特性和伸缩缝处的碰撞效应。结果表明 :当梁式桥相邻联周期相差较大时 ,纵向地震作用下 ,会导致伸缩缝处相邻梁体较大的相对位移和碰撞 ,碰撞导致低墩地震反应增大 ,对结构抗震不利。还提出了减小相邻联非同向振动和伸缩缝处碰撞效应的措施和方法
In this paper,the nonlinear seismic response of a model for girder bridges with unconventional configurations in western mountainous areas is evaluated.The characteristics of out-of-phase vibrations and pounding effects of adjacent girders at the movement joints are investigated.The results indicate that strong longitudinal earthquakes can lead to large relative displacements and pounding of adjacent girders at the movement joints due to the differences in the periods of adjacent girders.The pounding amplifies the responses of dwarf piers.Further more,a method for reducing the out-of-phase vibrations and pounding effects of adjacent girders at the movement joints are introduced.
In this paper,the nonlinear seismic response of a model for girder bridges with unconventional configurations in western mountainous areas is evaluated.The characteristics of out-of-phase vibrations and pounding effects of adjacent girders at the movement joints are investigated.The results indicate that strong longitudinal earthquakes can lead to large relative displacements and pounding of adjacent girders at the movement joints due to the differences in the periods of adjacent girders.The pounding amplifies the responses of dwarf piers.Further more,a method for reducing the out-of-phase vibrations and pounding effects of adjacent girders at the movement joints are introduced.
引文
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[4] RobertJankowski,KrzysztofWildeandYozoFujino.PoundingofSuperstructureSegmentsIsolatedElevatedBridgeDuringEarthquakes[J].EarthquakeEngineeringandStructuralDy namics,1998,27:487～502
[5] RobertJankowski,KrzysztofWildeandYozoFujino.Reduc tionofPoundingeffectsinElevatedBridgesDuringEarthquakes[J].EarthquakeEngineeringandStructuralDynamics,2000,29:195～212
[2] ManderJB ,PriestlyMJNandParkR .TheoreticalStressStrainModelforConfinedConcrete[J].JournalofStructuralEngineer,ASCE ,1988,114(8)
[3] PraveeenKMalhotra.DynamicsofSeismicPoundingatExpan sionJointsofConcreteBridges[J].JournalofEngineeringMechanics,ASCE ,1998,124(7)
[4] RobertJankowski,KrzysztofWildeandYozoFujino.PoundingofSuperstructureSegmentsIsolatedElevatedBridgeDuringEarthquakes[J].EarthquakeEngineeringandStructuralDy namics,1998,27:487～502
[5] RobertJankowski,KrzysztofWildeandYozoFujino.Reduc tionofPoundingeffectsinElevatedBridgesDuringEarthquakes[J].EarthquakeEngineeringandStructuralDynamics,2000,29:195～212
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