上承式钢管混凝土拱桥车-桥耦合振动分析.pdf
市政·交通·水利工程设计
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上承式钢管混凝土拱桥车-桥耦合振动分析
Vehicle-BridgeCouplingVibrationAnalysisofUploadConcrete-Filled
SteelTubeArchBridge
江展航
肇庆粤肇公路有限公司,广东肇庆526000)
JIANGZhan-hang
(ZhaoqingYuezhaoExpresswayCo.Ltd.,Zhaoqing526000,China)
【摘要】采用分离法建立车-桥耦合振动分析模型,将其分离为车辆、桥梁两种模型,并建立相应的独立运动方程,根据两模型
车轮接触位置处的位移和受力协调条件,通过迭代法分析求解。以通用有限元软件ANSYS为依托,以一上承式钢管混凝土拱桥为
工程实例,分析了桥面平整度和拱肋核心混凝土脱空率对桥梁动力响应的影响程度。结果表明:相较其他因素,桥面平整度对桥
梁动力响应的影响较大;L/4位置处,脱空率对桥梁动力响应的影响比拱顶位置处要大;实际桥梁冲击系数计算过程中应该计入
桥面平整度的影响。
Abstract铱Separationmethodisadoptedtoestablishthevehicle-bridgecoupledvibrationanalysismodeloftheseparationforvehicles,
Bridges,twokindsofmodel,andestablishthecorrespondingindependencemovementequation,accordingtothelocationofthetwomodelsin
thewheelcontacttheharmonizeconditionofdisplacementandstressanalysisbyiterationmethodisusedtosolve.Basedonalong-span
concrete-filledsteeltube(CFST)archbridge,theeffectsofdeckflatnessandarchribcoreconcretevoidratioonthedynamicresponseare
analyzed.Theresultsshowthatcomparedwithotherfactors,thebridgedeckflatnesshasagreatinfluenceonthedynamicresponseofthe
bridge.AtL/4position,theeffectofvoidratioondynamicresponseofbridgeisgreaterthanthatatvaultposition.Theinfluenceofbridgedeck
flatnessshouldbetakenintoaccountinthecalculationofactualbridgeimpactcoefficient.
车-桥耦合振动;