土木工程专业英语 教学课件 作者 陈瑛 5.1 Steel Connections.ppt

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1、5.1SteelConnectionsClassificationofConnectionsTypeofconnectingmediumusedBoltedconnectionsWeldedconnectionsBolted-weldedconnectionsRivetedconnectionsTypeofinternalforcestheconnectionstransmitShear(semi-rigid,simple)connectionMoment(rigid)connectionTypeofstr

2、ucturalelementsthatmadeuptheconnectionsSingleplateangleconnectionsDoublewebangleconnectionsTopandseatedangleconnectionsSeatedbeamconnectionsTypeofmemberstheconnectionsarejoiningBeam-to-beamconnectionsColumn-to-columnconnectionsBeam-to-columnconnectionsHang

3、erconnectionsEffectofconnectionsonstructuresMechanicalpropertyofconnectionsStrengthStiffnessStabilityNumberandcomplexityofconnectionsTimeforstaticalanalysisProductionofdrawingsProductionofconnectionInthefabricationshop–consumemuchofworkcontentSiteproductio

4、n–easeforerectionComponentsofConnectionsWeldingIsaprocessofjoiningmetalpartsbyfusingthemandfillinginwithmoltenmetalfromtheelectrode.Usedextensivelytojoinpartsandmembers,attachcleats,stiffeners,endplates,etc.andtofabricatecompleteelements.Isoneoftheoldestan

5、dreliablemethodsofjoining.AdvantagesofWeldingConnectionEnablesdirecttransferofstressbetweenmemberseliminatinggussetandspliceplatesnecessaryforboltedstructures.Hence,jointweightisminimum.Absenceofholesimprovestheefficiencyofthesection.Lessfabricationcost.Of

6、ferairtightandwatertightjoining,andhenceisidealforoilstoragetanks,shipsetc.Neatappearanceandenablestheconnectionsofcomplicatedshapes.Rigidity.Weldedjointsareasstrongorstrongerthanbasemetal.Lessstressconcentration.DisadvantagesofWeldingConnectionRequiresski

7、lledmanpowerforweldingaswellasinspection.Non-destructiveevaluationmayhavetobecarriedouttodetectdefects.Weldinginfieldmaybedifficultduetolocationorenviroment.Weldedjointsarehighlypronetocrackingunderfatigueloading.Largeresidualstressesanddistortiondeveloped

8、.ElectricarcweldingManualarcwelding:Usingahand-heldelectrodecoatedwithafluxwhichmeltsandprotectsthemoltenmetalWeldqualitydependsverymuchontheskillofthewelderAutomaticarcwelding:Acontinuouswireelectrodeisfedto