Title of article :
SimulatingstructuralcollapseofaPWRcontainmentOriginalResearchArticle
Author/Authors :
NawalK.Prinja، نويسنده , , DavidShepherd، نويسنده , , JimCurley، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
Abstract :
NNCLimitedwassponsoredbytheHealth&SafetyExecutive(UK)toconductfiniteelementanalysistosimulatetheover-pressurisationtestsconductedona1/4scalemodelofapre-stressedconcretecontainmentvessel(PCCV)bySandiaNationalLaboratories.Thetestsandtheresultsindicatedthreedistinctstagesofstructuralresponseasthevesselapproacheditsfailureload.Thefirststagewasessentiallyanelasticresponse.Thesecondstagedisplayednonlinearbehaviour,whichstartedafteronsetofsubstantialconcretecrackingandinvolvedlocalyieldingorfractureofstructuralcomponents.Thethirdstageinvolvedextensiveconcretecrackingandrapidincreaseinstrainsleadingtoglobalstructuralcollapse.
Thispaperdiscussestheengineeringjudgmentusedtodevelopthe3Dfiniteelement(FE)globalmodel,whichwassuccessfullyanalysedtopredictthefailuremode.Forthelimitstatetest(LST),itwasshownthatthelinerrupturesbeforestructuralcollapse.Forthestructuralfailuremodetest(SFMT),theasymmetricbehaviourwassuccessfullypredicted,identifyingtheweakareainthevesselwherethestructuralcollapsewasinitiated.Thiswaspossiblebecausethe3Dmodelsimulatedtheinteractionoftheessentialstructuralfeaturessuchasthetendons,buttresses,liner,penetrationsandthebasemat.Explicitmodellingofthepost-tensionedtendonsallowedthemodeltoaccommodatefrictionalloss,simulatingrealisticreductioninthepre-stresslevelsincertainareas.Detailedmodellingofthepenetrationsandbuttressessimulatedlocalstiffeningofthecylindricalwall.Themaximumdeflectionwasexpectedatthemid-heightofthewallintheareaawayfromlocalstiffeningandwherethepre-stresslevelshadreducedduetofriction.ThisweakareawasidentifiedbytheFEmodelandwasconfirmedbythetest.
Journal title :
Nuclear Engineering and Design Eslah
Journal title :
Nuclear Engineering and Design Eslah