Modelling Impact Loading of Reinforced Concrete Structures

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1、MODELLINGIMPACTLOADINGOFREINFORCEDCONCRETESTRUCTURESAndrewScanlonProfessorofCivilEngineeringThePennsylvaniaStateUniversityINTRODUCTIONImpactloadinginvolvingcollisionbetweenanexternalbodyandaconcretestructureisanextremeloadingconditionthathastobeconsideredinsomesituations.Typicalca

2、sesincludevehicleimpactagainstbridgeandotherstructures,icebergimpactagainstoffshorestructures,andimpactofprojectilesasaresultofexplosionsorfallingobjects,tonameafew.Analyticalmodellingofimpactphenomenapresentsasignificantchallenge.Inadditiontotreatingthecontactconditionsbetweentwo

3、impactingobjectsitisnecessarytoincludehighlynonlinearmaterialmodellingbecauseoftheseverityoftheloadingthatoftenoccurs.Becauseoftheshortdurationoftheload,strainratedependenceoftheresponseshouldalsobeconsidered.ThispaperpresentsabriefreviewoftworesearchprojectsrecentlyconductedatPen

4、nStateUniversitytoinvestigatethecapabilitiesoffiniteelementmodellingtohandleimpactloading.Thefirstprojectdealswiththegeneralcaseofimpactbetweenanexternalbodyandaconcretestructure.Botharetreatedastwo-dimensionalsystemsrepresentedbyplanestressfiniteelements.Thisworkwasmotivatedbyane

5、xperimentalprogramtoassesstheperformanceofbridgebarriersunderimpactloadssimilartovehicleimpact(Scanlonetal.1989).Thesecondprojectinvolvesthemodellingofreinforcingbarsembeddedinconcretetoinvestigatetheeffectsofhigh•rateimpactloadingonbondbetweenconcreteandreinforcement.MODELLINGIMP

6、ACTBETWEENEXTERNALMASSANDCONCRETESTRUCTUREInthisproject,Riad(1991)implementedthegeneralapproachtomodellingofimpactandreleaseconditionsproposedbyHughesetal.(1976).ConsideringthesimpleexampleshowninFigure1involvingamassstrikingaverticalcantilever,theelementnodesaredividedintocontact

7、andno-contactnodes.Theimpactvelocityofthe171D.E.Griersonetal.(eds.),ProgressinStructuralEngineering,171-182.©1991KluwerAcademicPublishers.172strikingmassisprescribedandatime-steppingprocedureisusedtomonitorthecontactconditionsatthepotentialcontactnodesduringandafterinitialimpact.M

8、ultipleimpactsarepossible.Neglect