Base Plate and Anchor Rod Design.ppt

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1、BasePlateandAnchorRodDesign**土建部内部教育训练讲义主讲人：ConcentricCompressiveAxialLoadsTensileAxialLoadsBasePlateswithSmallMomentsBasePlatesLargeMomentsDesignforshearForTypicalColumnbasePlateConnectionsinBuildings,FiveDifferentDesignLoadCasesinColumnBasePlateConnections.1.ConcentricCompressiveA

2、xialLoads1.1ConcreteBearingLimitOnthefullareaofaconcretesupportWhentheconcretebaseislargerthantheloadedareaonallfoursidesBaseplatelengthBaseplatewidthColumnflangewidthOverallcolumndepth1.2RequiredminimumthicknessofthebaseplateConservativetotakeas1.0Resistancefactorforflexure,0.90Fac

3、torofsafetyforASD,1.67NOTE:2.1AnchorRodTensionTensilestressareaMajordiameterNumberofthreadsperin2005AISCSpecification2.2ConcreteAnchorageforTensileForces(锚栓拔出强度)iftheanchorislocatedwheretheconcreteisnotcrackedatserviceloadotherwisethebearingareaoftheanchorrodheadornutdesigntensilest

4、rength=allowabletensilestrength=2.TensileAxialLoadsconsideringtheconcretetobeuncrackedatserviceloadsotherwiseconcretebreakoutconeareaforgroupconcretebreakoutconeareaforsingleanchordepthofembedment,in(锚栓群混凝土拉破强度)●为防止混凝土侧面胀破，建议锚栓与侧面混凝土最小距离为6d(d为锚栓直径)FromACI-318,anchorrodembedmentlengt

5、hequalsthetopcovertoreinforcingplusorplus0.75timesg(seeFigure3.2.5).Theminimumlengthis17timestheroddiameter.●埋入深度规定:DesignProcedure：DeterminetheaxialloadandmomentPickatrialbaseplatesize，Determinetheequivalenteccentricity，andthecriticaleccentricityIfgotonextstep;otherwise,refertodesi

6、gnofthebaseplatewithlargemomentDeterminethebearinglength，3.ColumnBasePlateswithSmallMomentsDeterminetherequiredminimumbaseplatethicknessDeterminetheanchorrodsizeNOTE:公制与英制使用公式的系数相同DesignProcedure：DeterminetheaxialloadandmomentPickatrialbaseplatesize，Determinetheequivalenteccentricit

7、y，andthecriticaleccentricityDeterminethebearinglength，andtensileforceintheanchorrod，DeterminetherequiredminimumbaseplatethicknessDeterminetheanchorrodsize4.ColumnBasePlateswithLargeMoments5.1Frictionbetweenthebaseplateandthegroutorconcretesurface0.55forsteelongrout0.7forsteelonconcr

8、ete5.2Bearingofcolu