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CAPACITYOFBENDINGMEMBERS

STRENGTH

BEARINGANDSHEARStrengthLimitStateDesignCapacityMomentatwhichthebeamwillhavebrokenintwo Zf‘b=bendingcapacity-testconditionsShearatwhichthebeamwillhavesplit Asf‘s=shearcapacity-testconditionsReactionatwhichthebeamwillhavecrushedApf‘p=bearingcapacity-testconditionsShearcapacityofbeamsLoaddiscountedwithin1.5dofsupportShearstrengthweakestacrossgrain–shearfailurebysplittingparalleltograind1.5dShearcapacityofbeamsShearcapacityusuallyampleunlessthecapacityofthebeamisveryshort–shearfailuresraref,k1,k4,k6asforothermembercapacitiesk11

In-gradetestdataavailable(MGP)-k11from

TableH4AppendixHAS1720.1.k11<1ford>140Noin-gradedata(F-grades),Glulam,LVL-k11=1ShearcapacityofbeamsShearareaAsShearstrengthf‘sIn-gradetestdataavailable(MGP)-f‘sfrom

AppendixHAS1720.1,manufacturer(LVL)Noin-gradedata-f‘sfrom

Table2.4(F-grades)and

Table7.1(Glulam)ShearinbearerFlowchartBearingcapacityofbeamsFunctionofthecrushingstrengthofthewoodfibresHigherbearingstrengthparalleltograin(atendofcolumns)comparedwithperpendiculartograin(inbeams)BearingperpendiculartograininbeamBearingparalleltograinincolumnBearingCapacity(f

Np)Perpendiculartograinbearing(f

Np)egbearingunderbeams,onbeamsunderpointloadsf,k1,k4,k6asforother

membercapacities

BearingperptograininbothbeamsEndgrainNewfactork7

foredgeeffects

Lengthandpositionofbearing‘Edgeeffect’-increaseinbearingcapacityforBearingPerpendiculartoGrainEdgeeffectStressdistribution

underbearingstandardbearingstrengthtests150mmlonghigherstrengthforshorterbearingsMUSThave75mmclearbetweenendofbeamandbearingtousek7>1.0k7Lengthofbearingfactork7modelsedgeeffect-increasedbearingcapacityofshortbearingscomparedwithstandardtestUsedwhenbearing<150mmlongand>75mmtimberextendingfrombothsides<150mm>75mm>75mmBearingCapacity(f

Nl)Paralleltograinbearing(f

Nl)egendsofcolumns(onlyinthecolumn)nok7factorBearing-angletograinf

N

Find(fNp)usingf‘p&k7Find(fNl)Calculate(fN

)FlowchartforBearingCapacityWorkedExample

Findtheshearandbearingstrengthofa14045MGP12seasonedfloorjoistforanofficeinAdelaide.StrengthLimitStateloadcombinations:Factored(crowd)imposedaction=2.04kN/mFactoredpermanentaction=0.40kN/mUniformlydistributedload,simplysupported

designspan=2.65mFlooringis24mmF11plywood(nailedat300mmcentres)Spacingbetweenfloorjoists=450mmBear

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