基于冲击回波法的混凝土板块开口裂纹的研究

,,(,430063):,,:;;;:TG115.28:A:100026656(2002)1120469204RESEARCHONTHESURFACE2OPENINGCRACKSINCONCRETEPLATESBASEDONIMPACT2ECHOMETHODZHAOGuo2wen,XIANGYang,PENGYong(WuhanUniversityofTechnology,Wuhan430063,China)Abstract:Thesurface2openingcracksindifferentdepthoftheconcreteplatesweretestedusingimpact2echomethod.Thedataobtainedwereprocessedandanalysed,andconclusionsweregiven.Keywords:Nondestructivetesting;Impact2echo;Crack;Concrete,,,,,1983,Sansalone,20a(),,,Sansalone,[1];AnishKumar[2];YichingLin,,2.31m[3],:2002204201,,,1,,1.1,(1a),,,(R),(P)(S),,(1b)9642411200211NDTVol.24No.11Nov.2002©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.1P,P,Pd(1cd),,,,Pd,(2)21.2[1],tP,PAB+BC(2)CptH1,H2,tCp,D(1)(3)(AB)2=H21+D2(1)(BC)2=H22+D2(2)AB+BC=Cpt(3)H1=H2,AB=BC,(1)(3)D=(Cpt)24-H2(4),t,,,(,)334T0,T1P1,T2P2,2T1T2,(4),Dt,t=T2-T0T0,(T1-T0)H3PCpT0(a)(b)4T1P1(4),P,T2PPdPd,T24b(T1-T0)PH3,T1-T0=H3Cp(5)t=T2-T0074:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.t=(T2-T1)+H3Cp(6),T0(6)t,D(4)22.1(5)(,)(,)(,)[4]52.2,,500mm500mm300mm50,100,150200mm,400mm,,0.3m,50,100,150200mm,,:425;:Mx=2.4,2.65,1.5%;:,D=2040mm,2.70;:;:,,1520;:=3.5MPa;:30MPa,80100mm,2.3%33.1P,P,P,6(a)(b)6,,6,P3.2H1=H2=H3=H0.09,0.070.05m,,7(a)(b)7174:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.7a,,,R,7b,,R(R),P,,(4)3.3,,,1,2,100150mm200mm,50mm,R50mm,1RmmkHzmmmmkHzmm171712611268315.5191139.5307214211028366012.523946.543502200mmHPmmPmmPmm17182.517.516.515.5180.619.417.414171.728.311.812.5165.934.110.45011182.817.220.59.5210.310.33.28210.310.312.76.5214144.117200.80.84.715.5195.44.617.814201121.412.5198.91.114.89011194.25.822.99.5191.28.822.78195.24.811.76.5193.56.512.94,H,PSR,,;H,,P,,,P3774mPs,Cp=0.57CR[5]CR=2151mPs1R,,50mm,3R50mm,50mm,,50mm,50mmt,,,,,t,:[1]SansaloneM,LinJM,StreettWB.Determiningthedepthofsurface2openingcracksusingimpact2generatedstresswavesandtime2of2flighttechniques[J].MaterialsJournaloftheAmericanConcreteInstitute,1997,95(2):12-18.[2]AnishKumar,ThavasimuthuM,JayakumarT.Structuralin2tegrityassessmentofringbeamofapressurizedheavywaternuclearusingimpact2echotechnique[A].15thWorldConfer2enceonNon2DestructiveTesting[MPCD].Rome:2000.[3]LinYiching,KuoShih2Fang,ChangChiafeng.Useofstresswavesformeasuringsurface2openingcrackinmassconcrete[A].15thWorldConferenceonNon2DestructiveTesting[MPCD].Rome:2000.[4]SansaloneM.Impact2echo:thecompletestory[J].ACIStructuralJournal,1997,94(6):27-31.[5]SansaloneM,StreetWilliamB.Impact2echoNondestructionEvaluationofConcreteandMasonry[M].Ithach,NY:Bull2brierPress,1997.274:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.