欢迎来到天天文库
浏览记录
ID:41188371
大小:6.07 MB
页数:16页
时间:2019-08-18
《Fundamentals of beam bracing》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、FundamentalsofBeamBracingJOSEPHA.YURAINTRODUCTIONinfinitywhenthebucklingloadisreachediftheidealbracestiffnessisused.Thus,abracesystemwillnotbesatisfac-hepurposeofthispaperistoprovideafairlycompre-Ttoryifthetheoreticalidealstiffnessisprovidedbecausethehensiveviewofthesubjectofbeamstability
2、bracing.braceforcesgettoolarge.Ifthebracestiffnessisoverde-Factorsthataffectbracingrequirementswillbediscussedsigned,asrepresentedbyβL=2βiand3βicurvesinFigureanddesignmethodsproposedwhichareillustratedby2(b),thenthebraceforceswillbemorereasonable.Foradesignexamples.Thedesignexamplesemphas
3、izesimplic-bracestiffnesstwicetheidealvalueanda∆o=Lb/500,theity.Beforegoingintospecifictopicsrelatedtobeambrac-braceforceisonly0.8%PeatP=Pe,notinfinityasintheing,someimportantconceptsdevelopedforcolumnbracingidealbracestiffnesscase.ForabracestiffnesstentimesthebyWinter(1960)willbepresente
4、dbecausetheseconceptsidealvalue,thebraceforcewillreduceevenfurtherto0.44willbeextendedtobeamslater.percent.AtPcrthebraceforcecannotbelessthan0.4%PForaperfectlystraightcolumnwithadiscretemidheightcorrespondingto∆T=∆o(aninfinitelystiffbrace)for∆o=bracestiffnessβL,therelationshipbetweenPcran
5、dβLisLb/500.FordesignFbr=1%PisrecommendedbasedonashowninFigure1(TimoshenkoandGere,1961).Thecol-bracestiffnessoftwicetheidealvalueandaninitialout-of-umnbucklesbetweenbracepointsatfulloridealbracing;straightnessofLb/500becausetheWintermodelgivesinthiscasetheidealbracestiffnessβi=2Pe/Lbwhere
6、Pe=slightlyunconservativeresultsforthemidspanbraceprob-π2EI/Lb2.Anybracewithstiffnessuptotheidealvaluewilllem(Plaut,1993).increasethecolumnbucklingload.Winter(1960)showedPublishedbracingrequirementsforbeamsusuallyonlythateffectivebracesrequirenotonlyadequatestiffnessbutconsidertheeffectof
7、bracestiffnessbecauseperfectlyalsosufficientstrength.Thestrengthrequirementisstraightbeamsareconsidered.Suchsolutionsshouldnotbedirectlyrelatedtothemagnitudeoftheinitialout-of-useddirectlyindesign.Similarly,designrulesbasedonstraightnessofthemembertobebraced.strengt
此文档下载收益归作者所有