中英用碳纤维板cfr修复剪切不足的矩形简支梁

英文原文：RehabilitationofrectangularsimplysupportedRCbeamswithsheardeficienciesusingCFRPcompositesAhmedKhalifaa,*,AntonioNannibaDepartmentofStructuralEngineering,UniversityofAlexandria,Alexandria21544,EgyptbDepartmentofCivilEngineering,UniversityofMissouriatRolla,Rolla,MO65409,USAReceived28April1999;receivedinrevisedform30October2001;accepted10January2002AbstractThepresentstudyexaminestheshearperformanceandmodesoffailureofrectangularsimplysupportedreinforcedconcrete(RC)beamsdesignedwithsheardeficiencies.Thesememberswerestrengthenedwithexternallybondedcarbonfiberreinforcedpolymer(CFRP)sheetsandevaluatedinthelaboratory.Theexperimentalprogramconsistedoftwelvefull-scaleRCbeamstestedtofailinshear.Thevariablesinvestigatedwithinthisprogramincludedsteelstirrups,andtheshearspan-to-effectivedepthratio,aswellasamountanddistributionofCFRP.TheexperimentalresultsindicatedthatthecontributionofexternallybondedCFRPtotheshearcapacitywassignificant.Theshearcapacitywasalsoshowntobedependentuponthevariablesinvestigated.Testresultswereusedtovalidateasheardesignapproach,whichshowedconservativeandacceptablepredictions.eq\o\ac(○,C)2002ElsevierScienceLtd.Allrightsreserved.Keywords:Rehabilitation;Shear;Carbonfiberreinforcedpolymer1.IntroductionFiberreinforcedpolymer(FRP)compositesystems,composedoffibersembeddedinapolymericmatrix,canbeusedforshearstrengtheningofreinforcedcon-crete(RC)members[1–7].ManyexistingRCbeamsaredeficientandinneedofstrengthening.TheshearfailureofanRCbeamisclearlydifferentfromitsflexuralfailure.Inshear,thebeamfailssuddenlywithoutsufficientwarninganddiagonalshearcracksareconsid-erablywiderthantheflexuralcracks[8].Theobjectivesofthisprogramwereto:1.InvestigateperformanceandmodeoffailureofsimplysupportedrectangularRCbeamswithsheardeficien-ciesafterstrengtheningwithexternallybondedCFRPsheets.2.Addressthefactorsthatinfluenceshearcapacityofstrengthenedbeamssuchas:steelstirrups,shearspan-to-effectivedepthratio(a/dratio),andamountanddistributionofCFRP.3.Increasetheexperimentaldatabaseonshearstrength-eningwithexternallybondedFRPreinforcement.4.Validatethedesignapproachpreviouslyproposedbytheauthors[9].Fortheseobjectives,12full-scale,RCbeamsdesignedtofailinshearwerestrengthenedwithdifferentCFRPschemes.Thesemembersweretestedassimplebeamsusingafour-pointloadingconfigurationwithtwodifferenta/dratios.2.Experimentalprogram独2.1.踩Tes族tsp挑ecim屋ens究and冰mate辛rial帆s丘Twel终vef徐ull-踪scal怖ebe碌ams蛾peci怒mens跌wit永ha杨tota茄lsp扮ano槽f30如50m林m.a访nda轧rec菊tang故ular搭cro乖ss-s君ecti驶ono赴f15惜0-mm凉-wid规ean歌d30钻5-mm第-dee惯pwe遗ret检este滑d.T挣hes声peci惧mens科wer贯egr姓oupe迈din梢tot祖wom痛ain格seri纤esd势esig沾nate心dSW拢and锣SO介depe臂ndin椒gon蜘the蜂pre缎senc跃eof嫁ste际els忍tirr梅ups种int浪hes双hear酿spa录nof迎int贿eres狗t.薪Seri常esS饺Wco挽nsis葬ted低off母our柴spec耕imen等s.T印hed某etai韵lsa翅ndd欠imen长sion坡sof贱the椒spe许cime贴nsd陕esig品nate呜dse烂ries旅SW忠are相illu衬stra档ted贤inF舰ig.浑1a.去Int平his继seri石es,史four枣32-益mms活teel产bar板swe渐reu球sed言asl移ongi笔tudi达nal梢rein石forc胜emen雨twi圈tht梅woa凶tto命pan哥dtw害oat刑bot静tom酒face惹of滔the怠cros斯s-se欲ctio氧nto约ind江uce廊ash闹ear攀fail耳ure.誉The充spe盼cime楚nsw愧ere宅rein绵forc妥edw记ith尽10-m咳mst撇eel刻stir你rups验thr应ough感out锈thei哪ren柜tire搁spa挂n.T岩hes智tirr钱ups度spac残ing界int矮hes吨hear遥spa盈nof话int兽eres蹄t,r侦ight拌hal男f,w夜ass光elec南ted排toa代llow划fai唱lure血in穷that许spa生n.钞Seri布esS骂Oco惩nsis裳ted净ofe斯ight滨bea浩msp垦ecim祥ens,雀whi腊chh茎adt季hes维ame慌cros若s-se巧ctio子ndi墓mens胡ion葬and盗long震itud碍inal册ste或elr艇einf叉orce举ment炼as失for负seri炭esS脂W.N止ost逮irru摇psw榆ere卖prov梦ided撇in身the姓test淡hal可fsp秃ana球sil冻lust拜rate竹din做Fig争.1b拿.坡Each辆mai半nse析ries答(i.抚e.s滚erie庙sSW晃and某SO)扑was阵sub书divi赠ded静into倒two多sub牙grou忍psa知ccor笛ding跟to貌shea泄rsp毅an-t晨o-ef我fect有ive缩dept戚hra泰tio.酿Thi钓swa翼sse蒸lect肺edt非obe岂a/d体=3肠and酷4,姜resu喊ltin拌gin湾the柄fol骨lowi萄ngf敞our约subg伏roup丧s:S标W3;S省W4;秘SO3;宇and生SO4荡.把The侍mech呼anic索alp足rope叔rtie根sof描the乌mat病eria距lsu应sed津for员manu昂fact移urin秀gth喜ete住sts他peci屋mens花are际lis脑ted躲inT反able杠1.F诵abri外cati对ono摄fth众esp膜ecim简ens胃incl馆udin默gsu芬rfac僻epr眉epar智atio愿nan郊dCF始RPi卸nsta森llat毒ion害isd伯escr栏ibed揉els洲ewhe头re[息10].械Tabl挠e1饱2.2.姓Str圈engt岸heni悄ngs授chem竭es嫁One版spec必imen黎fro拣mea佣chs杀erie那s(S根W3-1套,SW顿4-1,说SO3惧-1a缩ndS殊O4-1省)wa哄sle父ftw斥itho嚼uts籍tren务gthe笋ning六as双aco输ntro驳lsp锡ecim狠en,编wher肺eas吐eigh御tbe拳ams贤peci监mens叫wer披est废reng议then工edw馒ith肠exte局rnal景lyb错onde稼dCF诚RPs未heet扯sfo歪llow烧ing斩thre芹edi侄ffer伯ent燕sche访mes沈asi符llus季trat伞edi场nFi勤g.2痰.歪Ins品erie估sSW腰3,s蝶peci扭men汪SW3-捞2wa斩sst盘reng霉then我edw裳ith择two皇CFRP桐pli题esh唇avin轿gpe管rpen斯dicu益lar奴fibe店rdi刑rect惭ions晒(90帮°/0°耍).T丹hef及irst式ply敬was演att贪ache怨din驴the豆for枯mof持con菠tinu暖ous草U-wr颤apw核ith帽the退fibe计rdi隙rect简ion爽orie客nted医per捎pend殊icul粥art翻oth起elo耳ngit怜udin容ala磨xis赴oft蛙hes做peci恨men丑(90°省).贪The斩seco临ndp涂lyw而asb焰onde促don刮the种two讨sid膛eso围fth伙esp佣ecim宝enw嫁ith缘the猜fibe悔rdi愤rect泳ion提para献llel植to愈the唇beam肠axi论s助（缩0主°眉）氏.Thi铲spl拢y[i位.e.赏0°pl既y]w角ass粮elec泡ted大toi透nves摆tiga肾tet己hei丈mpac遮tof肌add掏itio渐nal储hori白zont让alr羊estr虚aint敌on位shea买rst沾reng脸th.灯Ins逢erie达sSW严4,s辈peci佩men回SW4-塑2wa虚sst沟reng向then养edw飞ith计two丸CFRP猜pli序esh感avin谣gpe搭rpen处dicu黑lar锤fibe军rdi推rect蛙ion栋(90°沸/0°)详as烘for浊spec幼imen紫SW3浴-2.己Four融bea院msp渠ecim怠ens倚were羞s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