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时间:2019-05-11
《斜拉桥在多车辆作用下的动力响应分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、桥梁建设2ol4年第44卷第6期(总第229期)BridgeConstruction,Vo1.44,No.6,2014(TotallyNo.229)81文章编号:1003—4722(2014)06—0081—07斜拉桥在多车辆作用下的动力响应分析王贵春,李武生(1.郑州大学土木工程学院,河南郑州450001;2.机械工业第六设计研究院,河南郑州450007)摘要:为研究车辆偏载和车辆间距对斜拉桥动力响应的影响,以福建长门大桥(主跨为550m的双塔双索面混合粱斜拉桥)为背景进行分析。基于有限元法和动力平衡原理分别建立车辆和桥梁2个子系统的力学模型和振动微分方程。根据2个子
2、系统之间位移协调条件和动力相互作用力相等的原则,利用ANSYS编写迭代计算的APDL命令流求解车一桥系统的振动微分方程。考虑不同偏载程度和车辆间距情况,分析桥梁结构的动力响应,结果表明:随着偏载程度的增大,桥梁结构动力响应在总体上增大,个别指标有一定的波动性和随机性;随着车辆间距的增大,桥梁结构动力响应在总体上减小。关键词:斜拉桥;车一桥耦合振动;车辆偏载;车辆间距;动力响应;有限元法中图分类号:U448.27;U441.3文献标志码:AAnalysisofDynamicResponsesofCable‘-StayedBridgeUnderActionofMultipl
3、eVehiclesWANGGui—chun。LIWu—sheng(1.SchoolofCivilEngineering,ZhengzhouUniversity,Zhengzhou450001,China;2.SIPPREngineeringGroupCo.,Ltd.,Zhengzhou450007,China)Abstract:Tostudytheeffectofvehicleeccentricloadingandvehiclespacingdistancesonthedynamicresponsesofcable—stayedbridge,theChangmenBri
4、dge(ahybridgirdercable—stayedbridgewithdoublepylons。doublecableplanesandwithamainspanof550m)inFujianwastakenasanexampleandwasanalyzed.Basedonthefiniteelementmethodanddynamicequilibriumprinciple,themechanicalmodelsandvibrationdifferentialequationsforthetwosubsystemsofthevehiclesandbridgew
5、ererespectivelybuilt.Ontheprinciplethatthecompatibledisplace—mentconditionsanddynamicinteraactiveforcesofthesubsystemswereequivalent,theANSYSwasusedtocompiletheAPDLcommandstreamforiterativecalculation。thevibrationdifferentialequationsforthevehicle—bridgesystemweresolvedandinconsideration
6、ofthedifferenteccentricloadingdegreesandspacingdistancesofthevehicles,thestructuralresponsesofthebridgewereanalyzed.Theresultsoftheanalysisindicatethatwiththeincreaseoftheeccentricloadingde—gree,thedynamicresponsesofthebridgeincreaseonthewhole,inwhichsomeoftheindividualindicesmayhavecert
7、ainfluctuationandrandomnessandwiththeincreaseofthevehiclespacingdistance,thedynamicresponsesofthebridgedecreasesingenera1.Keywords:cable-stayedbridge;vehicle—bridgecoupledvibration;vehicleeccentricloading;vehiclespacingdistance;dynamicresponse;finiteelementmethod1引言一个重要内容
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