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1、第26卷第12期公路交通科技Vol126No1122009年12月JournalofHighwayandTransportationResearchandDevelopmentDec12009文章编号:1002O0268(2009)12O0050O06预应力CFRP板加固钢梁抗弯疲劳试验研究1,221叶华文,T1Ummenhofer,强士中(11西南交通大学土木工程学院,四川成都610031;21InstituteforRehabilitationofBuildingsandStructures,UniversityofBraunschweig,Braunschweig38106
2、,Germany)摘要:首先,采用修正的Pairs公式分析粘贴预应力CFRP板加固的钢构件的疲劳裂纹扩展行为。然后通过粘贴CFRP板的预制裂纹钢梁4点弯曲进行疲劳试验研究,最后基于阻止裂纹扩展的角度提出一种初步估计加固所需预应力大小的简化计算和设计方法。结果表明,粘贴预应力CFRP板对钢梁疲劳寿命的影响很大,与预制裂纹阶段比寿命提高最高可达10倍以上。不同的预制裂纹,同样的加固措施效果差别可达10倍。采用后张法施加预应力效果很好,锚固装置可以实时控制有效预应力,且预应力损失很小。关键词:桥梁工程;加固;疲劳试验;预应力CFRP板;预应力损失中图分类号:U445147文献标识码:A
3、ExperimentalStudyofFlexuralFatiguePerformanceofSteelGirderReinforcedbyPrestressedCFRPPlate1,221YEHuawen,T1Ummenhofer,QIANGShizhong(11SchoolofCivilEngineering,SouthwestJiaotongUniversity,ChengduSichuan610031,China;21InstituteforRehabilitationofBuildingsandStructures,TechnicalUniversityofBrauns
4、chweig,Braunschweig38106,Germany)Abstract:BondingPrestressedcarbonfiberreinforcementpolyester(CFRP)plateisapromisingtechniquetostrengthensteelmemberdamagedbyfatigue1First,amodificationofParis.equationwasusedtoanalyzethecrackpropagationofthesteelmemberstrengthenedbyCFRPplate1FourOpointbendingf
5、atiguetestofpreOcrackedsteelgirderstrengthenedwithprestressedCFRPplateswasalsoconductedtoinvestigatetheflexuralfatigueperformanceofreinforcedsteelgirder1Intheendasimplifiedcalculationanddesignmethodwasalsopresentedtoestimatethere-quiredprestresspreliminarytostopthepropagationoffatiguecracks1T
6、heresultshowsthat(1)thistechniquepro-ducesasignificantincrementoffatiguelifeofsteelgirderwhichismorethan10timescomparedwiththatofpreOcrackstage;(2)thefatiguelives,whichextendedfromthereinforcementwithdifferentpreOcracksizes,differupto10times1ThepostOtensioningmethodwasappliedtoprestresstheCFR
7、Pofsteelgirderplatesuccessfullyandan-choragesystemcanrealOtimecontroltheprestressinCFRPplatesandtheprestresslossisslight1Keywords:bridgeengineering;reinforcement;fatiguetest;prestressedCFRPplate;prestressloss[1][2][3]止疲劳裂纹扩展。赵启林、邓军和Triantafil
