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1、2017年第8期(總第334期)混凝土理論研究Number8in2017(TotalNo.334)ConcreteTHEORETICALRESEARCHdoi:10.3969/j.issn.1002-3550.2017.08.007CFRP布加固箱型混凝土梁受彎試驗(yàn)研究趙宏威(中鐵建大橋工程局集團(tuán)第三工程有限公司,遼寧沈陽(yáng)110043)摘要:針對(duì)箱型鋼筋混凝土梁進(jìn)行了CFRP布加固試驗(yàn)研究,考察混凝土強(qiáng)度、配筋率、U形箍間距、加固量等因素對(duì)箱型梁在抗彎性能和力學(xué)行為等方面的影響。試驗(yàn)制作了8根試驗(yàn)梁
2、,將加固后的箱型梁的承載力、延性和剛度的性能進(jìn)行了對(duì)比分析,綜合評(píng)價(jià)各因素的加固效果,并通過(guò)比較材料應(yīng)變隨荷載變化曲線分析CFRP布加固對(duì)鋼筋受力影響。CFRP布加固箱型混凝土梁能夠較好地改善其受彎性能,有效抑制裂縫的發(fā)展和延長(zhǎng)裂縫發(fā)生時(shí)間,相比標(biāo)準(zhǔn)梁,CFRP布加固箱型混凝土梁裂縫數(shù)量明顯增多。CFRP布加固后可以有效抑制裂縫的發(fā)展,能夠充分發(fā)揮材料性能,明顯提高梁的剛度,有效提高梁的極限荷載?;炷灵_裂前,加固梁鋼筋和加固材料應(yīng)變相差不大,共同受力;鋼筋屈服后,CFRP布應(yīng)變?cè)黾拥乃俣让黠@加快,
3、說(shuō)明CFRP布承擔(dān)著大部分荷載,充分發(fā)揮了其抗拉強(qiáng)度高的優(yōu)點(diǎn)。關(guān)鍵詞:混凝土結(jié)構(gòu);箱型梁;加固;CFRP布;受彎性能中圖分類號(hào):TU528.01文獻(xiàn)標(biāo)志碼:A文章編號(hào):1002-3550(2017)08-0027-05ExperimentalstudyonflexuralperformanceofboxtypereinforcedconcretebeamsstrengthenedwithCFRPZHAOHongwei(ChinaRailwayConstructionBridgeEngineering
4、BureauGroup3rdEngineeringCo.,Ltd.,Shenyang110043,China)Abstract:TheboxtypereinforcedconcretebeamswerestudiedonCFRPstrengthenedexperimental,toinvestigatethestrengthofconcrete,reinforcementratio,U-shapedhoopspacing,amountofreinforcementfactorsontheboxbea
5、mimpactintermsofflexuralperformanceandmechanicalbehavior.Testproducedeightbeamsandcarryingcapacity,ductilityandstiffnesspropertiesofreinforcedboxbeamwerecomparativeanalysis.Comprehensiveevaluationofvariousfactorsreinforcingeffectandbycomparisonwiththel
6、oadcurveofthematerialstrainanalysisofreinforcedCFRPreinforcementforce.CFRPreinforcedconcreteboxbeamcanbetterimprovetheflexuralproperties,effectivelyinhibitthedevelopmentofcracksandcrackextensionoftimeofoccurrence,comparedtostandardbeam,CFRPreinforcedco
7、ncreteboxbeamsignificantlyincreasedthenumberofcracks.CFRPreinforcementcaneffectivelyinhibitthedevelopmentofcracks,cangivefullplaytothematerialproperties,significantlyincreasethestiffnessofthebeam,thebeameffectivelyimprovetheultimateload.Beforeconcretec
8、racking,reinforcementsteelbeamsandreinforcementmaterialstrainareorless,andcancommonforce.Aftersteelyielding,CFRPstrainincreasessignificantlyfaster,indicatingCFRPbearmostoftheloadatthistime,givefullplaytoitshightensilestrengthadvantage.K