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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研究趙宏威(中鐵建大橋工程局集團第三工程有限公司,遼寧沈陽110043)摘要:針對箱型鋼筋混凝土梁進行了CFRP布加固試驗研究,考察混凝土強度、配筋率、U形箍間距、加固量等因素對箱型梁在抗彎性能和力學行為等方面的影響。試驗制作了8根試驗梁
2、,將加固后的箱型梁的承載力、延性和剛度的性能進行了對比分析,綜合評價各因素的加固效果,并通過比較材料應變隨荷載變化曲線分析CFRP布加固對鋼筋受力影響。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)展和延長裂縫發(fā)生時間,相比標準梁,CFRP布加固箱型混凝土梁裂縫數量明顯增多。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變相差不大,共同受力;鋼筋屈服后,CFRP布應變增加的速度明顯加快,
3、說明CFRP布承擔著大部分荷載,充分發(fā)揮了其抗拉強度高的優(yōu)點。關鍵詞:混凝土結構;箱型梁;加固;CFRP布;受彎性能中圖分類號:TU528.01文獻標志碼:A文章編號: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