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框2.1.貿(mào)Tes吹tsp諷ecim敬ens慌and鏡mate列rial路s灰Twel兼vef稼ull-脈scal旁ebe診ams橫peci津mens棉wit拋ha梁tota毯lsp瞞ano它f30斗50m創(chuàng)m.a爐nda蜘rec時(shí)tang跑ular館cro勝ss-s愉ecti暫ono好f15嫁0-mm鴿-wid賄ean光d30總5-mm精-dee飼pwe誤ret趨este設(shè)d.T拜hes貧peci全mens恢wer誕egr紗oupe岡din挪tot燭wom職ain桐seri漸esd濁esig御nate胖dSW慶and逗SO乞depe飼ndin乏gon取the列pre妻senc預(yù)eof閉ste第els但tirr捉ups杏int零hes珍hear飼spa爽nof病int照eres捧t.噸Seri唐esS辮Wco婆nsis槍ted石off雨our脹spec上imen翁s.T旨hed景etai喜lsa作ndd倚imen喪sion著sof掠the趕spe鍵cime爸nsd飲esig裂nate朝dse廊ries語SW歌are忘illu乏stra騙ted杯inF悔ig.謝1a.藏Int拆his雕seri申es,縮four束32-勁mms壩teel供bar源swe勁reu噴sed紛asl檢ongi雁tudi轎nal泊rein巾forc礦emen既twi勇tht魂woa栽tto俱pan古dtw萄oat捉bot所tom柔face隱of福the精cros潮s-se訊ctio殘nto氏ind擾uce婆ash淡ear歷fail扛ure.挎The楊spe謙cime泡nsw編ere降rein糾forc君edw富ith銷10-m謎mst免eel愛stir醋rups茶thr侍ough軍out闊thei蘿ren皂tire妹spa浪n.T賊hes淹tirr符ups瓶spac族ing筑int四hes貫hear址spa綿nof秘int莊eres狹t,r陸ight寨hal剩f,w煌ass受elec溉ted銹toa扯llow販fai燒lure涉in秘that疏spa應(yīng)n.并Seri療esS郵Oco憲nsis硬ted柜ofe個(gè)ight郊bea斧msp司ecim伍ens,坑whi倒chh脅adt妙hes雕ame框cros驗(yàn)s-se球ctio企ndi亭mens友ion嗎and悲long瞧itud弄inal謙ste寨elr寬einf謙orce啄ment罰as從for壩seri書esS詠W.N斷ost約irru既psw商ere直prov贏ided息in度the弓test熱hal剛fsp齡ana紡sil詠lust傳rate山din腥Fig甜.1b感.帥Each裙mai六nse獨(dú)ries塊(i.炭e.s磁erie榴sSW況and強(qiáng)SO)舞was廈sub剪divi竭ded腦into陪two帖sub腐grou畝psa肚ccor欣ding條to皇shea碎rsp屢an-t霧o-ef語fect拾ive話dept胞hra饅tio.住Thi磚swa柴sse坡lect魯edt桌obe陵a/d訂=3綿and射4,鑒resu引ltin伙gin是the顧fol乖lowi志ngf翅our縮subg廳roup供s:S雪W3;S紡W4;尿SO3;法and誰SO4煙.遞The臣mech好anic閃alp霸rope盞rtie屆sof種the闖mat拐eria升lsu時(shí)sed利for貼manu吸fact謙urin秒gth割ete詳sts陪peci盡mens涌are策lis林ted瓶inT以able美1.F侵abri蘇cati叼ono松fth娛esp攜ecim飾ens設(shè)incl蜻udin縱gsu考rfac峽epr虎epar種atio棍nan容dCF峰RPi情nsta儉llat繼ion嚇isd叛escr度ibed城els掛ewhe編re[匙10].嫂Tabl掠e1倒2.2.俯Str元engt沃heni昆ngs市chem多es疊One選spec嫌imen掠fro蹦mea目chs籍erie訓(xùn)s(S冷W3-1縱,SW柔4-1,請SO3騾-1a屋ndS蕩O4-1兄)wa惱sle更ftw墾itho熊uts國tren廊gthe哄ning旺as席aco唉ntro塞lsp慶ecim炸en,艦wher肥eas座eigh酬tbe揚(yáng)ams怠peci列mens望wer圍est饞reng脈then巾edw堆ith而exte竊rnal允lyb踩onde且dCF商RPs濱heet子sfo高llow積ing達(dá)thre啄edi握ffer牽ent脆sche瓶mes裹asi儲llus配trat與edi輩nFi憐g.2塌.美Ins表erie第sSW忘3,s泉peci爬m(xù)en益SW3-蔽2wa正sst刻reng涉then際edw靈ith孤two羽CFRP綱pli農(nóng)esh棋avin謎gpe氧rpen攝dicu收lar喝fibe循rdi形rect薪ions傷(90勁°/0°肉).T礎(chǔ)hef顛irst錢ply略was關(guān)att洪ache禁din槐the脆for咸mof步con穩(wěn)tinu負(fù)ous訪U-wr燕apw扶ith懸the圍fibe唐rdi砍rect憤ion蒼orie鵲nted崇per完pend暴icul計(jì)art亦oth荷elo嘉ngit箭udin俱ala捆xis禾oft伸hes季peci想men乞(90°語).巧The袍seco吊ndp該lyw唐asb鴉onde濫don銹the財(cái)two凝sid券eso刑fth辣esp辜ecim罩enw步ith瑞the礦fibe臨rdi第rect夠ion慮para總llel久to勿the市beam距axi饞s燃（挖0蔬°敵）魯.Thi次spl建y[i奇.e.舊0°pl且y]w媽ass充elec千ted掀toi海nves啦tiga夏tet黎hei示mpac坡tof刻add節(jié)itio晚nal拖hori冒zont湖alr盒estr鐘aint及on把shea儉rst窗reng煩th.弱Ins炭erie匯sSW鍛4,s覽peci棒men寬SW4-辰2wa姜sst捆reng題then法edw籌ith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