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                       FailurelawofPCCPcausedbybrokenwires Ⅰ:Prototypeexperimentalstudy

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                                               1
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                                                              1
                  DOUTiesheng,DONGXiaonong,ZHANGXuan,LIYanlong,NINGJinghua,LIKangping                 2
                     (1.StateKeyLaboratoryofSimulationandRegulationofWaterCycleinRiverBasin,ChinaInstituteofWaterResourcesand
                                             HydropowerResearch ,Beijing 100038,China;
                    2.StateKeyLaboratoryofEco - hydraulicsinNorthwestAridRegion,Xi’anUniversityofTechnology,Xi’an 710048,China;
                               3.PowerchinaShandongPipelineEngineeringCorporationLimited,Jinan 250117,China)
                  Abstract:Atpresent,thenumberofbrokenwiresisthemainfactorconsideredinthestructuralperformanceas
                  sessmentofprestressedconcretecylinderpipe (PCCP).Duetothegrippingeffectofmortaronbrokenwires,the
                  initialsize ,extensiontiming,andextensionamplitudeoftherangeineachbrokenwireregainingitsfulltension
                  arekeyindicatorsforstudyingthepreservationofprestressinthecore.Basedondistributedfiberopticsensors ,
                  thispaperpresentsfourprototypeexperimentsonthePCCPswiththesamedesignparameters,focusingonwire
                  breakageuntilfailure ,consideringtheeffectsoftwowire - breakingtypesunderthreeloadtypes.Theultimate
                  numbers (rates)ofbrokenwiresintheexperimentsoftheclusteredandscatteredwirebreakageundertheconstant
                  internalpressure ,scatteredwirebreakageunderthecyclicinternalpressure,andclusteredwirebreakageunder
                  theconstantexternalloadare60(19.8%),185(61.1%),140(46.2%),and150(49.5%),respectively.Ex
                  perimentalinvestigationobtainednumbersofbrokenwirescorrespondingtothedamageofconstituentmaterialsand
                  thefinalfailureofpipesunderdifferentconditions ,whichrevealedthelawsoftheprestresslossandfailureofthe
                  core,highlightingkeyfactorsthatshouldbeconsideredwhenevaluatingthestructuralperformanceofPCCPwith
                  brokenwires.Furthermore,itprovidesabasisfordevelopinganumericalmethodforsimulatingthewire - breaking
                  process.
                  Keywords:PCCP;prototypeexperiments; clusteredwirebreakage; scatteredwirebreakage; cyclicinternal
                  pressure ;prestressloss;failure

                                                                                    (责任编辑:韩 昆)

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