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1、9thInternationalConferenceonFractureMechanicsofConcreteandConcreteStructuresFraMCoS-9V.Saouma,J.BolanderandE.Landis(Eds)DOI10.21012/FC9.126MODELINGTHEEVOLUTIONOFACRACKINAPRESTRESSEDCONCRETESTRUCTURE*†††††E.LEFEBVRE,S.MICHEL-PONNELLEE.LORENTZANDF.FEYEL*EcoledesMinesPari
2、sTech,CentredesMatériauxParis,Francee-mail:eric-lefebvre@mines-paristech.fr†IMSIA,UMR9219CNRS/EDF/CEA/ENSTA,Paris,Francee-mail:sylvie-michel.ponnelle@edf.fr,eric.lorentz@edf.fr††SafranTech,SafranSA,Saclay,Francee-mail:frederic.feyel@safran.frKeywords:Prestressedconcret
3、estructure,Fracture,Steel-ConcretedebondingAbstract:Thisworkfocusesonfollowinganexistingcrackinapre-stressedconcretestructurewithoutdescribingtheearlystagesofdamage.Thisleadstoanestimationoftheoverallleakageofthestructure.A“globalmodel”isproposedthatrepresentsmostpheno
4、menainteractingwiththebehaviourofanexistingcrack.Themodelisbuiltfromarealcrackingpattern.Theexistingcracksaretakenintoaccountthroughacohesivezonemodel;steelreinforcementsandpre-stressingtendonsaremodelledbymeansofhomogenizedmembranemodels;thedebondingsteel-concreteisre
5、presentedbyanotherspecificcohesivezonemodel.Theconstitutivelawusedformodellingtheconcretetakesintoaccountbasiccreep(througharheologicalmodeldistinguishingthedeviatoricpartandthesphericalpart),shrinkageanddryingcreep.[1,2]consistsinmodellingthecableswithtruss1Introducti
6、onelements.Unfortunately,suchmodellingresultsinspuriousstressconcentrationsinthesurroundingEDF-themajorFrenchelectricityvolume[3]anditgenerallyassumesaperfectsteel-Company-manages73nuclearreactors.Forsomeconcretebond.Thereforeweprefertouseaofthem,thethirdprotectivebarr
7、ierconsistsinamembraneelement,forwhichthebehaviourisconcretedouble-walledcontainmentbuilding.Theobtainedbyhomogenization[3,4,5].Numerically,keypointofsuchpredictionsconsistsindescribingthistypeofmodelling–lesscommoninthethebehaviourofpotentialcracks.However,theliteratu
8、re–doesnotgeneratestressconcentration.sizeofthestructurecoupledwiththeimportantPre-stressedstructuresalsorequiretotak
