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,,(,200092):,,:;;:TG115.28+5:A:100026656(2001)0820323204ULTRASONICTESTINGMETHODSFORTHEDEPTHOFCONCRETECRACKLINWei2zheng,SUYong,HONGYou2gen(InstituteofAcoustics,TongjiUniversity,Shanghai200092,China)Abstract:Conventionalultrasonictestingmethodsforthedepthofaconcretecrackareintroduced.Inaddition,newultrasonictestingmethodsforthedepthofaconcretecrackarealsoresearched,suchasphasevariationmethod,transversewavemethodandimpact2echomethod.Keywords:Concrete;Crackdepth;Ultrasonictesting,,,,,(50cm),,,1(50cm),1tc2t02BS4408tc2t0,BS4408,tc2t0:20002062261tc2t0d=a[(tc/t0)2-1]1/2TR2BS4408d=15[(4t21-t22)/(t22-t21)]1/2,,32323820018NDTVol.23No.8Aug.2001©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.2L,tc2t0,,d3d,,,2(3)[1]3,ad,3bc180,,a,ad(3c)+90,,,4,(5)+=90(6),,,,,d=ab45615220cm5cm,a1.5d,,,,,(7)7423:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.3/100kHzSH,5050,,,L1=20mm,L2=40mm,0.977,t=51.54exp(0.00897d)(1)8,,VRVS,t,L1L2,t=L1+dVR+d2+L22VS(2)8/4[2],,,,4.1,,,,U2Sonic(FFT),(9),9.2613.06kHzh=c2f(3)9hcc=3941m/sf,kHz9.26kHz22cm,13.06kHz15cm4.2,,,,,1010,R()t1,cR,(t1-h0/cR)P(),R2PPt2,Pt=t2-t1-h0cR=t2-t1+h0cR(4)Pcp,cpt523:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.h1h2,d=(cpt)2+h21-h222cpt2-h21(5)cR3610m/s,Pcp3941m/s,h0=2cm,h1=9cm,h2=9cm,,111111,t1=-0.6s,t2=80.4s,(4)t=86.5s;(5)d=14.47cm;[(14.50-14.47)/14.50]100%=0.2%h1h2,11)h0cmh1cmh2cmt1st2stsdcm%299-0.680.486.514.470.2259077.983.414.751.72117082.988.414.802.1:1)14.50cm,1,:[1].[J].,1999,(3):287-289.[2],.[J].,1999,(2):163-166.[3]LinY,LiouT,SiaoCM.Recentdevelopmentsintheimpact2echotechniquefornondestructiveevaluationofconcretestructures[A].Procof14thWCNDT[C].Del2hi:1996./()1999122,,,,(),/,,,,,;,,,361000,1979200133000,()623:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.