基于动力的预应力混凝土独塔斜拉桥承载力评估
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摘要
结合桥梁现场环境振动试验和有限元模型修正,本文提出了一套基于动力的大型桥梁承载力评估方法,并应用该方法对一座预应力混凝土斜拉桥的承载力以及发生可能损伤后的承载力进行了分析评估。结果表明:该斜拉桥在当前状态下能够满足设计要求,不需要进行调索,但拉索面积折减与超载对桥梁承载力具有较大的影响。此类评估对于桥梁养护与维修、长期健康监测具有重要的意义。
In this paper, combining with the field ambient vibration tests and finiting element (FE) model updating, a dynamic-based evaluation method is proposed and adopted to predict the load-carrying capacity of a prestressed concrete cable-stayed bridge with single tower under the current condition and several possible damage conditions. It is demonstrated that the cable-stayed bridge can satisfy the design requirements and the adjustment of cable forces is not needed under the current condition. The results also reveal that over-loading and the area discount of stay-cables caused by cautery make great influence on the load-carrying capacity of the bridge. This kind of evaluation can serve as a basis for the long-term health monitoring, maintenance and rehabilitation and it has great importance.
In this paper, combining with the field ambient vibration tests and finiting element (FE) model updating, a dynamic-based evaluation method is proposed and adopted to predict the load-carrying capacity of a prestressed concrete cable-stayed bridge with single tower under the current condition and several possible damage conditions. It is demonstrated that the cable-stayed bridge can satisfy the design requirements and the adjustment of cable forces is not needed under the current condition. The results also reveal that over-loading and the area discount of stay-cables caused by cautery make great influence on the load-carrying capacity of the bridge. This kind of evaluation can serve as a basis for the long-term health monitoring, maintenance and rehabilitation and it has great importance.
引文
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[2]史敏.中小桥梁承载能力评定方法研究[D].上海:同济大学,2001.
[3]孙九春,大型桥梁综合评估系统研究[D].上海:同济大学,2002.
[4]Wei XinRen,GeorgeEBlandford,IssamEHarik.RoeblingSuspensionBridge.I:Finite ElementMedolandFreeVibrationResponse[J].JournalofBridgeEngineering,ASCE,2004,9(2):110—118.
[5]Wei XinRen,IssamEHarik,GeorgeEBlandford,etc.RoeblingSuspensionBridge.II:AmbientTestingandLive loadResponse[J].JournalofBridgeEngineering,ASCE,2004,9(2):119—126.
[6]阮毅,既有混凝土独塔斜拉桥承载力评估[D].福州:福州大学,2004.
[7]Wei xinRen,Zhou hongZong.ExperimentalModalParameterIdentificationofCivilEngineeringStructures[J].InternationalJournalofStrcutureEngineeringandMechnanics.2004,17(3 4):429—444.
[8]PeetersB.SystemIdentificationandDamageDetectioninCivilEngineering[D].DepartmentofCivilEngineering,K.U.Leuven,Belgium,2000.
[9]陈刚,任伟新.基于环境振动的斜拉桥拉索基频识别[J].地震工程与工程振动,2003,23(3):101—106.
[10]ZhouhongZong,YiRuan,WeixinRen.Dynamicperformanceofaconcretecable stayedbridgewithsingletowerusingambientvibrationtesting[A].In:TheProceedingoftheEightthInternationalSymposiumonStructuralEngineeringforYoungExperts(ISSEYE 8)[C].Xian,China:SciencePress,2004,348—355.
[11]谭建国.使用ANSYS6.0进行有限元分析[M].北京:北京大学出版社,2002.
[12]FriswellMI,MottersheadJE.Finiteelementmodelupdatinginstructuraldynamics[M].TheNetherlands,KluwerAcademicPublishers,1995.
[13]JamesMW,Brownjohn,Pin QiXia.DynamicAssessmentofCurvedCable StayedBridgebyModelUpdating[J].JournalofStructuralEngineering,ASCE,2000,126(2):252—260.
[14]福州市三县洲大桥索力监测报告[R].武汉:中铁大桥工程局桥梁科学研究院,1999.
[15]福州市三县洲闽江大桥斜拉桥汽车荷载试验报告[R].福州:福州大学结构工程研究所,1999.
[16]ManualforConditionEvaluationandLoadRatingofHighwayBridgesUsingLoadandResistanceFactorPhilosophy[R],FinalreportpreparedforNationalCooperativeHighwayResearchprogram,TransportationResearchBoard,RationalResearchCouncil;SubmittedbylichtensteinConsultingEngineers,Inc.,Paramus,NJ.,May2001.
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