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1、維普資訊http://www.cqvip.com第4卷第4期鐵道科學(xué)與工程學(xué)報(bào)Vo1．4NO．42007年8月JOURNALOFRAILI，＼／AYSCIENCEANDENGINEERINGAug2007外貼碳纖維布加固大比例鋼筋混凝土梁抗彎性能周朝陽(yáng)，李毅卉，賀學(xué)軍(中南大學(xué)土木建筑學(xué)院，湖南長(zhǎng)沙410075)摘要：以某類鐵路橋梁為原型，通過(guò)5根粘貼碳纖維布加固鋼筋混凝土梁的1／3比例模型試驗(yàn)，研究了梁表面處理方式和加固前預(yù)栽歷史對(duì)加固梁抗彎能力和破壞形態(tài)的影響。試驗(yàn)結(jié)果表明，粘貼表面打磨的梁發(fā)生纖維布帶面層
2、剝離破壞，而鑿毛處理時(shí)最終破壞均為混凝土壓碎；若不出現(xiàn)剝離破壞，則碳纖維布具有良好的加固效果；加固時(shí)，梁上既有荷栽越小，則加固效果越好基于《規(guī)程》(CECS146：2003)的基本假定，考慮既有荷栽的影響，對(duì)本文試件的屈服彎矩和極限彎矩進(jìn)行理論分析，其結(jié)果與實(shí)測(cè)值較吻合，說(shuō)明《規(guī)程》中計(jì)算屈服后壓碎時(shí)的的正截面承栽力公式對(duì)碳纖維布加固較大尺度、較高配筋混凝土粱也是適用的。關(guān)鍵詞：外貼：碳纖維布；抗彎加固；鋼筋混凝土梁中圖分類號(hào)：U448．34文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1672—7029(2007)04—0041—
3、06Flexuralbehavioroflarge——scaleRCbeamsreinforcedwithexternallybondedcarbonfibersheetsZHOUChao—yang，LIYi—hui，HEXue—jun(SchoolofAmhitectureandCivilEngineefing，CentralSoulhUnive~ity，Changsha410075，China)Abstract：Withatypeofrailwaybridgeasaprototype，fiveone—thi
4、rd—scalespecimensofreinforcedconcretebeamsweremade，andfourofthemwerestrengthenedwithexternallybondedcarbonfibersheets．Theparametersinvestigatedinthisstudyincludedthewayoftreatingconcretesurfaceandthelevelofpre—loadingatstrengthening．Theireffectsontheflexural
5、capacityandfailuremodewereparticularlyconsidered．Theexperimentalresultsshowthattheultimatefailureischaracterizedbyconcretecrushingwhenthebeamsurfaceisroughenedbypicking．Incontrast，peeling—ofhappensincaseofsurfaceplaning．ExternallybondedCFRPsheetscanincreaset
6、heflexuralcapacityofthebeamsig—nificantlyifdebondingisavoided．Inaddition，theresultsindicatethatthelighterthepre—loadonthebeam，themoretheincrementofitsultimateloadcomparedtothatofunstrengthenedspecimen．Inconsiderationoftheinfluenceofpre—load，theoreticalanalys
7、esarecarriedouttopx~dictthebendingmomentsatrebaryieldingandconcretecrush—ingonthehasisoftheassumptionsfromthespecification(CECS146：2003)．Thecalculatedresuhsareingoodagree—mentwiththemeasuredvaluesforrefeiTedmenl}lers．Meanwhiledesignalgorithmofthecorrespondin
8、gcapacityinthespecificationisvalidatedforCFRPsheet——strengthenedconcretebeamswithratherlanesizesofsectionandheavyra-tiopercentageofsteelreinforcement．Keywords：externallybonded；carbonfibersheet；f
