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厚壁冷成型钢构件残余应力分析.docx

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厚壁冷成型钢构件残余应力分析 Abstract Cold-formedsteelmembersarewidelyusedinconstructionowingtotheirhighstrengthandefficientmaterialproperties.However,thesemembersarepronetoresidualstressesduringtheformingprocessthatcansignificantlyaffecttheirmechanicalbehavior.Thisstudyexaminestheresidualstressdistributioninthick-walledcold-formedsteelmembersusingexperimentalandcomputationaltechniques.Theexperimentalinvestigationinvolvesperforminganultra-thincut-sectiontesttomeasuretheresidualstressesalongthethicknessofthesteelmember.Thecomputationalanalysisinvolvestheuseoffiniteelementmodelingtopredicttheresidualstressdistributioninthesteelmember.Theresultsoftheanalysisshowsubstantialdifferencesintheresidualstressesbetweenthetwomethods.Furthermore,theresidualstressesappeartobenonlinearalongthethicknessofthesteelmember.Theresultsofthisstudycanbeusedtooptimizethedesignofcold-formedsteelmemberstoaccountforthepresenceofresidualstresses. 1.Introduction Cold-formedsteelmembershavebeenwidelyusedintheconstructionindustryduetotheirlightweight,highstrength,andoptimalmaterialproperties.Duringtheproductionofcold-formedsteelmembers,theyoftenundergosignificantplasticdeformation,whichcanleadtothedevelopmentofresidualstresses.Theresidualstresseshaveasignificantimpactontheload-carryingcapacityandthelong-termbehaviorofthesteelmembers.Therefore,theaccurateassessmentofresidualstressesisessentialforthedesignandanalysisofcold-formedsteelstructures. Severalstudieshavebeenconductedonresidualstressesincold-formedsteelmembers.Mostofthesestudiesfocusedonthin-walledmembers,astheirstressdistributionissignificantlydifferentfromthatofthick-walledmembers.However,inengineeringdesign,thick-walledsteelsectionsarewidelyusedinpracticalapplicationssuchasinstorageracks,steelframes,andstoragetanks. Thus,theobjectiveofthisstudyistoinvestigatetheresidualstressesinthick-walledcold-formedsteelmembers.Theresidualstressdistributionalongthethicknessofthememberwillbemeasuredexperimentallyusinganultra-thincut-sectiontechnique.Acomputationalsi