钢梁-柱落锤冲击实验及数值模拟分析

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1、山东建筑大学硕士学位论文ExperimentAndNumericalSimulationAnalysisOfSteelBeam—ColumnImpactedByDroppingHarmmerLiYueqiang(StructuralEngineering)DirectedbyXiFengABSTRACTInrecentyears，steelstructurehasbeenusedincreasinglyincivilengineeringduetOitswidelyrecognizedadvantage

2、s，whichpromotesthedevelopmentofrelevantdesigntheoryandacademicresearchtoacertainextent．Specially,studyontheresistanceofsteelstructuresunderexplosionandimpactloadisbecomingahotspot．Withinthedesignlife，inadditiontotheconventionaldesignload，steelstucturesal

3、sobearaccidentalexplosionorimpactloadsometimes，SOtheymusthavetheappropriateresistance．Thedynamicresponseunderimpactloadofsteelbeamsandcolumns，whicharethemainload-beatingmembers，isthefirstproblemtobesolved．Atthesametime，itCanalsoprovidesthebasisforfurther

4、design．Thisarticle‘mainlystudysthedynamicresponseofI-shapedcross-sectionbeam—columnsunderimpactload，includingimpactexperiment,finiteelementsimulationandtheequivalentsingledegreeoffreedommodelanalysis．Intheexperiment,weuseacylindricalhelicalcompressionspr

5、ingtOapplytheaxialload，recordthedeformationprocessandstrainofthememberusingIligIl—speedcamerasanddynamicsignalacquisitionsystem．Experimentalre钒dtsshowthat：whensubjectedtOlateralmidpointimpacteffect，simplysupportedbeam-columnmembersappearnotonlybendingdef

6、ormationintheplanebutalsobendingandtorsionaldeformationoutoftheplane；andthelocalbucklingofwebisthereasonofbendingandtorsiondeformation；thebendingdeformationintheplaneandtorsionaldeformationoutoftheplanewillincreaseastheincreasingimpactvelocityandaxialloa

7、d，butaspecificrangeofimpactvelocityandaxialloadwilldecreasetorsionaldeformationoutoftheplane；changesinaxialforcerelatetotheaxialdeformationandthestiffnessofthespring，whichindicatesthatusinglessrigid万方数据山东建筑大学硕士学位论文compressionspringtOapply趾axialloadissuit

8、able．UsingthesoftwareANSYS／LS-DYNA,simulationabouttheexperimenthasbeenmade．Bythecomparisonofdeformingprocess，thefinaldisplacementandstraindata,wefindoutthatbothfiniteelementanalysisandexperimentresultshaveagoodmatch，showin