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4 3 7 Vo.l4 3 No.7
2 0 1 0 7 CHINA CIVILENGINEERING JOURNAL Ju.l 2010
张伟平 宋 力 顾祥林
(, 200092)
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:TU37 5.1 TG174.3 :A
:1000-131X(20 10 )07 -004 3-08
FaigueperformanceofcorrodedRCbeamssrenghened
wihcarbonfibercomposieshees
ZhangWeiping SongL iGuXianglin
(TongjiUniversiy, Shanghai200092, China)
Absrac:Tesswerecarriedou forencorrodedreinforcedconcree(RC)beamssrenghenedwihcarbonfiber
composiesheesand wocorrodedRC beamsunderfaigueloading,s oinvesigae heflexuralfaiguebehaviorof
corrodedRCbeamsandheinfluencesofhereinforcemencorrosion, hereinforcemen raioofcarbonfibercomposie
shee,s hefaigueloadlevelanddamagesausbeforesrengheningon hefaiguebehaviorofRCbeam.s Iisfound
ha heypicalfaiguefailureprocessofcorrodedRCbeamssrenghenedwihcarbonfibercomposiesheessillfollows
hehree-phaserul,e bu hepercenageofhesecondphaseinhewholeprocessisdeclined.Thefaiguebehaviorof
seelbarsishemainfacoroconrolhefaiguefailureofacorrodedRCbeam, andhefaiguelifeofaRCbeammay
beseverelyreducedwihheincreaseofreinforcemen corrosion.ThefaiguefailureofacorrodedRCbeammayoccurin
heform ofbrilefracureofensionseelbar.s Howeve,r afersrenghenedwihexernallybondedcarbonfiber
composieshee,s heflexuralfaiguebehaviorofacorrodedRCbeammaybeconsiderablymiproved, hefaiguelife
maybesignificanlyincreasedandheresidualbearingcapaciyofacorrodedbeam aferrupureofreinforcemen seel
barsmaybeguaraneed.A designmehod omiprovehefaigueperformanceofcorrodedRCbeamswihexernally
bondedcarbonfibercomposiesheesisproposed.FaiguelifeofaRCbeammaybeseverelyreducedbyincreaseofload
levelandhefaiguedamagebeforehesrenghening. Thu,s overloadingshouldbeavoidedasmuchasp
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