碳纤维抗弯加固钢筋混凝土梁的剥离破坏研究

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1、东南大学博士学位论文碳纤维抗弯加固钢筋混凝土梁的剥离破坏研究姓名：潘建伍申请学位级别：博士专业：结构工程指导教师：程文瀼;曹双寅20050617东南大学博士学位论文StudyonDebondingFailureinCFRPFlexuralStrengthenedRCBeamsDuringtherecontdecade．duet0妞developmentofmaterialindusn了,theapplicationofCFRP(CarbonFiberReinforcedPolymer)inmen蛐gRCstructuresisdevelo

2、peddramatically．CFRPhaveadvantagessuchashighspcx斌cs衄-ngth，easeofconstruction,gooddurability,etc．However,thepe而onnancoofsUengtbencdmembersmayalwaysbecoRlpromisedbydebondingofCFRP．Sothecharacteristicsofdebundingfailureshouldbestudiedthoronghiy．．n壕main∞nt∞tandachievementofth

3、ispaperarcstlrnmarigcdasfollows：Black-boxpredictiononthedebondingloadandfail．remodesiscarriedouLOntheD代：dic妇ofdebundingload,ageneticalgorithmbasedselectivewaveletnetwork∞semblenamedGAWNSENisproposed．ExperimentalresultsshowthatGAVv3qSENhaveadvantagessuchasgoodgeneralizatio

4、n，stabiliT_tionand∞aI娜ItoutperformspopularmethodsincludingBERBEGRNNandGASEN．Decisiontreeisutilizedtoexffactattributem口portauceanddecisionmlesfromtheexperimentdam．Supportvec／[ormachine(SVM)isadoptedtoaccurateclassifyfailuremodes．Basedonsineandcosineseriesandprincipleofleas

5、twork,aclosed-fromsolutiononshearandnormalinteffacialsu℃ssbctwccnFRPandconcreteispresentedandcomparedwithRoberts’solution．P卸阿nt—kanalysisresultsaleoblalncd：themostimportantfactoroninterfacestressisanchoragelens．Interfacestressdecreaseswiththeincreaseofanchorage1e呜山，andisp

6、roportionaltoFRPmodulusandF肿thickness．Autocrackpropagationinsinglematerialandinterfaceofbi-materialispmgranm同．Concretecovel'delaminationfailurenearFl冲plateendisstudied．Crackpropagationprocessissimulatedandrelated6xc山mparametersmobtained：Itismix·modefracturewhencrackpropag

7、atedalongtheflexuralreinforcementandmodeIfractureisdominate；Itismix—modefracturewhencrackpropagatedalongtheinterfaceandmodeⅡfractureisdominate．buttheinterfacebetweenconcl'eteandadhesiveisnottheweaklink．Basedonresultsofnumericalsimulationandtheoryofelastic慨n鹏m∞hanics．ancwa

8、naly伽modelisproposed．thecomputeformulasa弗dedu∞d'andcalibratedwitha【p口i栅taldam．nisfoundoutperform