土木结构的光纤光栅与布里渊共线测试技术

43320103CHINACIVILENGINEERINGJOURNALVo.l43Mar.No.32010:(10672048,50538020,50278029):,,:20080916周智1何建平1吴源华1欧进萍1,2(1.,150090;2.,116024):,,,,,,,:;;;;;;:TU317:A:1000131X(2010)03011108MeasurementtechniquebasedontheFBGBOTDA(R)forInfrastructuresZhouZhi1HeJianping1WuYuanhua1OuJinping1,2(1.HarbinInstituteofTechnology,Harbin150001,China;2.DalianUniversityofTechnology,Dalian116024,China)Abstract:Therearedisadvantagesofcurrentdistributedstrainmonitoringtechnology,suchaslowaccuracyandspatialresolution,lowsamplingfrequency,andlargecos.tSinglepointstrainmeasurementtechniquewithhighprecisioncannotcoverthedamagefeaturesofstructuresoflargespan,longdistance,largedeformationandhiddenlocation,andthecostofinstallationofthesensorstakesupabigproportionofstructuralhealthmonitoringsystem.AnintegratedsystemofdistributedfullscaleandlocalmonitoringtechniquewithsingleopticalfiberisdevelopedbycombingtheBrillouindistributedsensingtechnologywithlocalhighprecisionopticalfiberBragggrating(FBG)technology.Ahighstrengthanddurablestraincellbasedonthisconcep,twithoutweakness,isalsoproduced,namedasFiberBraggGratingfiberreinforcedpolymer(FRPOFBG).Experimentsofareinforcedconcretebeamunderthreepointbendingandafullscalecablearecarriedouttoverifytheeffectivenessandtheadvantagesoftheintegratedsystem.Theresultindicatestheintegratedsystemcanbeusedformonitoringoflargescale,complexandlongspanstructures.Keywords:fiberbragggrating;brillouinopitcalfibersensor;strainmonitoring;fusionandintegratinginoneline;fullscalemeasuremen;tfiberreinforcedpolymer;structuralmonitoringEmail:[e-mail],,,,[13]Inaudi[2],2001(2003)(2003)CB32A(2003)(2005)(2006)10,[45],1122010,2003[6],,,,,,,,,90,DavisKersey[7],,,,,FBG[8]2006,FRPFRP[910],,,FBGBOTDA(R),,,,(),11.120,,,,[11]:B=!!+TT(1),!,T;BBragg;!,T1.2,,,,,,[12]:VB=C!!+CTT+VB0(2),C!CT,VB0,VB21,,;,,,,;,433113,,,,,MOISI720SI425SI130,!1∀!,10~250Hz;OmnisensDiTeStSTA202,!20∀!,0.5m,30km1Fig.1BOTDA(R)FBGsystemforintelligentmonitoring3,,(FRP)FRPOFBG,FRP,,FRPOFBGBOTDA(BrillouinOpticalTimeDomainAnalysis)BOTDR(BrillouinOpticalTimeDomainReflectory),(,),,,,FRPOFBG:([10]):BOTDAFRPOFBGFBOTDA,0.8∀/MHz21.8∀!/MHz[13];FBGFRPOFBGFFBG,16.8pm/∀1.2pm/∀!FBOTDAFFBGFRPOFBG4FBGBOTDA(R)4.12700#200#400mm,150mm,L/43L/4,1.2mFBGFRPOFFRPOFBG,,2,,FRPOFBGFRPOF(SBOTDA),1m,,FRPOFBGFBG1560nm;,1.2m(OF1OF2);FBG(SFBG)(ES)10cmFFBGFBG,FBOTDABOTDA4.2,3,:72kN,6kN,1142010,50kN,3FBGBOTDAFig.3StrainmonitoringofFBGBOTDAonRCbeam4,,BOTDA,SBOTDAFBOTDA0.6,BOTDA0.5m4,FBOTDAFFBG5FRPOFBG5,FFBGFBOTDA,FBOTDA0.25m,,FRPOFBG17m5FFBGFBOTDAFig.5StrainmeasuredbytheFBGBOTDAsystem6(a)0213kN,FFBGFBOTDA,ES72kN(21kNm),,,,,,108kN(32.4kNm),,,,6(b)FFBGFBOTDA,,FFBGFBOTDA,;7FBOTDAFFBG,,,,5%,BOTDA,!20∀!433115,FRPOFBGBOTDA(R)FBG,FFBGFBOTDA,220kN,FRPOFBG,5FBGBOTDA(R)5.1FRPOFBG8FRPOFBG,FRPOFBG(),FRPOFBG,8FRPOFBG,FRPOFBG,FRPOFBG,FRPOFBG,,FRPOFBG,,,:!steel=!FRP(3)Fcable=EsteelAcs!steel=EsteelAcs!FRP(4),!steel!FRPFcableAcsFRPOFBGFRP,61,1%,FRP8Fig.8Plansketchofsmartcable5.2FRPOFBG,:20.3,61,7mm,210GPa,P3990kNFRPOFBG5mm,FBG1527nm1531nm1000T(9),,FRPOFBG0.22P9,0.22P0.25P0.33P0.44P0.55P0.44P0.33P0.25P0.22P5,BOTDAFBG,9Fig.9ThecableforcemonitoringofSmartcable11620101011,BOTDAFBG10,,,,10,11,FBG,FRPOFBG(),101112BOTDA,,13FBOTDAFBGFFBG,BOTDA433117,FBOTDA17m14FBOTDAFFBG,FBGBOTDA,3.8%7.5%,1∃L%,∃U%14Fig.14Relativeerrorofthecableforce1Tabel1Relativeerrorofcableforce(kN)FBOTDA(%)FFBG(%)L0.22P00L0.25P0.600.21L0.33P1.140.81L0.44P3.141.27L0.55P2.681.56U0.44P7.690.95U0.33P6.282.04U0.25P5.812.89U0.22P6.273.81,60%,FRPOFBGFBGBOTDA(R),FBOTDAFFBG,FFBGFBOTDA6(FBGBOTDA(R)),:FRPOFBG,60%,FRPOFBGBOTDA(FBOTDA)FBG(FFBG),,FFBGFBOTDA,,[1]LanChunguang,ZhouZh,iSunShouwang,eta.lFBGbasedintelligentmonitoringsystemoftheTianjinYonghebridge[C]//ProceedingsofSPIE.FiberOpticSensorsinCivilEngineering,2008[2]InaudiD,GlisicB.Developmentofdistributedstrainandtemperaturesensingcables[C]//ProceedingsofSPIE.FiberOpticSensorsinCivilEngineering,2005[3],,.Bragg[J].,2006,(2):4344(JiangDesheng,HaoYichang,LiuShenchun.ApplicationofFBGloadcellonbowstringarchbridge[J].InstrumentTechniqueandSensor,2006,(2):4344(inChinese))[4],,,.[J].,2004,37(1):4549(OuJinping,ZhouZh,iWuZhanjun,eta.lIntelligentmonitoringofHeilongjiangHulanriverbridgebasedonFBGs[J].ChinaCivilEngineeringJourna,l2004,37(1):4549(inChinese))[5].[D].:,2006:3540(ZhouZh.iR&Dofseriesofbasedproductsandtheirapplicationsinfrastructures[D].Harbin:HarbinInstituteofTechnology,2006:3540(inChinese))[6],,,.BOTDR[J].,2003,36(11):8387(ZhangDan,ShiBin,WuZhishen,eta.lDistributedopticalfibersensorbasedonBOTDRanditsapplicationtostructuralhealthmonitoring[J].ChinaCivilEngineeringJourna,l2003,36(11):8387(inChinese))[7]DavisMA,KerseyAD.SeparatingthetemperatureandstraineffectsonfiberBragggratingsensorsusingstimulatedBrillouinscattering[C]//ProceedingsofSPIE.FiberOptic1182010SensorsinCivilEngineering,1996[8].[D].:,2005:7897(LiuDehua.Studyonsuperlongdistancedistributedopticalfibersensingtechnologyanditsapplication[D].Zhejiang:ZhejiangUniversity,2005:7897(inChinese))[9]ZhouZh,iHeJianping,OuJinping.Longtermmonitoringofacivildefensi